Additional Site Characterization Work Plan TABLE OF CONTENTS Page 1.0 2.0 3.0 4.0 5.0 INTRODUCTION.................................................................................................................. 1 1.1 Site Description ........................................................................................................... 1 1.2 Involved Parties ........................................................................................................... 3 1.3 Project Background ..................................................................................................... 4 DOCUMENTATION OF RECENT SITE CHARACTERIZATION EFFORTS....................... 7 2.1 Groundwater Well Installation and Sampling .............................................................. 7 2.1.1 2010-2011 Well Installation Program .............................................................. 7 2.1.2 2011-2012 Well Installation Program ............................................................ 10 2.1.3 Groundwater Monitoring ................................................................................ 12 2.2 Soil Vapor Well Installation and Monitoring Activities................................................ 17 2.2.1 2009 Soil Vapor Survey ................................................................................. 17 2.2.2 Soil Vapor Well Installation and Sampling ..................................................... 18 2.2.3 2012 Eastern Perimeter Well Sampling ......................................................... 19 2.3 Soil Vapor Extraction Testing .................................................................................... 21 2.3.1 One Day Preliminary SVE Pilot Test ............................................................. 21 2.3.2 Extended SVE Pilot Test ............................................................................... 23 CURRENT CONCEPTUAL SITE MODEL ......................................................................... 31 3.1 Environmental Setting ............................................................................................... 31 3.1.1 Topography ................................................................................................... 31 3.1.2 Climate .......................................................................................................... 31 3.1.3 Land Use ....................................................................................................... 31 3.1.4 Surface Water Hydrology .............................................................................. 32 3.1.5 Regional Hydrogeology ................................................................................. 32 3.1.6 Site Hydrogeology ......................................................................................... 34 3.2 Nature and Extent of Contamination ......................................................................... 35 3.2.1 Distribution of Impacts ................................................................................... 35 3.2.2 Transport Mechanisms .................................................................................. 40 3.2.3 Identification of Potential Receptors .............................................................. 42 3.3 Data Gaps ................................................................................................................. 43 WORK REQUIRED TO SUPPORT RAP DEVELOPMENT............................................... 45 4.1 Objective and Approach ............................................................................................ 45 4.2 Planned Desktop Studies .......................................................................................... 45 4.2.1 Soil Vapor Treatment Technology Evaluation ............................................... 45 4.2.2 Groundwater Transport Modeling .................................................................. 46 4.3 Planned Field Programs ............................................................................................ 48 4.3.1 Soil Vapor Well Installation and Testing ........................................................ 48 4.3.2 Soil Vapor Extraction Operations .................................................................. 50 4.3.3 Groundwater Monitoring ................................................................................ 50 4.4 Development of the Revised RAP ............................................................................. 51 4.5 Project Schedule ....................................................................................................... 52 REFERENCES................................................................................................................... 53 Maricopa County Cave Creek Landfill Phoenix, AZ November 19, 2012 Page i Additional Site Characterization Work Plan LIST OF TABLES Table 1 Table 2 Table 3 Table 4 Table 5 Table 6 Table 7 Table 8 Site History Well Construction Summary Groundwater Elevation, Gradient, and Flow Direction Summary Groundwater TCE Data Summary SVE Pilot Test Results – Summary of Operational Data SVE Pilot Test Results – Wellhead Sample Data SVE Pilot Test Results – Treatment Performance Data Domestic/Public Water Supply Wells Registered with ADWR since March 2009 within Three Miles of CCL LIST OF FIGURES Figure 1 Figure 2 Figure 3 Figure 4 Figure 5 Figure 6 Figure 7 Figure 8 Figure 9 Figure 10 Figure 11 Figure 12 Figure 13 Figure 14 Site Map Well Location Map Groundwater Elevations in Site Wells – 2001 through 2012 Potentiometric Surface Maps – December 2011, January 2012, March 2012, and May 2012 Streamflow in Cave Creek and Monthly Precipitation – 2005 through 2012 Select ADWR Registered Wells within a 3-mile Radius of Cave Creek Landfill Annual Groundwater Pumpage in COP and COS Wells near CCL Lines of Cross Sections Generalized Hydrostratigraphic Cross Section A-A’ and B-B’ Generalized Hydrostratigraphic Cross Section C-C’ TCE Concentration Trends in Groundwater Estimated Extent of TCE Impacted Groundwater Conceptual Site Model Planned Locations of Future Soil Vapor Monitoring Wells LIST OF APPENDICES Appendix A Appendix B Appendix C Appendix D Appendix E Appendix F Appendix G Appendix H Appendix I Appendix J Appendix K Boring Logs Geophysical Logs Well Construction Logs Groundwater Elevation Data Groundwater Analytical Results – Summary of Organic Data Groundwater Analytical Results – Summary of Inorganic Data Soil Vapor Analytical Results – Summary of Chlorinated Solvent and Related Compound Data Soil Vapor Analytical Results – Summary of Aromatic and Fuel Related Compound Data Soil Vapor Analytical Results – Summary of Freon and Other VOC Data One-Day SVE Pilot Test Operational and ROI Data Extended SVE Pilot Test Operational and ROI Data Maricopa County Cave Creek Landfill Phoenix, AZ November 19, 2012 Page ii Additional Site Characterization Work Plan LIST OF ACRONYMS AND ABBREVIATIONS 1,1-DCA 1,1-DCE 1,2-DCB acfm ADEQ ADHS ADWR AEL AMA AMEC AMSL AWQS BAS bgs BLM CaCO3 CAS CCL cis-1,2-DCE CO COC COP COS CSM EPA ESRV FID ft gal GCWP H2O HCL HDPE HP hrs IDW in L/min Layne lbs LCRS LCS LFG 1,1-dichloroethane 1,1-dichloroethene 1,2-dichlorobenzene actual cubic ft per minute Arizona Department of Environmental Quality Arizona Department of Health Services Arizona Department of Water Resources Airtech Environmental Laboratories Phoenix Active Management Area AMEC Environment & Infrastructure, Inc. above mean sea level Aquifer Water Quality Standard Bryan A. Stirrat & Associates below ground surface Bureau of Land Management Calcium Carbonate Columbia Analytical Services Maricopa County Cave Creek Landfill cis-1,2-dichloroethene Consent Order contaminant of concern City of Phoenix City of Scottsdale conceptual site model United States Environmental Protection Agency East Salt River Valley flame ionization detector feet gallon Cave Creek Landfill Groundwater Characterization Work Plan water hydrochloric acid high-density polyethylene horsepower hours investigation derived waste inches liters per minute Layne Christensen Company pounds leachate collection and recovery system low carbon steel landfill gas Maricopa County Cave Creek Landfill Phoenix, AZ November 19, 2012 Page iv Additional Site Characterization Work Plan LIST OF ACRONYMS AND ABBREVIATIONS MAU MCAQD MCRM MCWRRM MEK μg/L mg/m3 mLs/min min MSU NOI OD P Well PCE PDB PID PW RAO RAP RCRA scfm Sch Southwest Exploration SVE SVOCs TCE TCLP TDS THF trans-1,2-DCE TSD UAU USGS V VOA Work Plan Yellow Jacket Middle Alluvial Unit Maricopa County Air Quality Department Maricopa County Risk Management Department Maricopa County Waste Resources & Recycling Department methyl ethyl ketone (or 2-butanone) micrograms per liter milligrams per cubic meter milliliters per minute minute municipal solid waste Notice of Intent outside diameter perimeter well tetrachloroethene passive diffusion bag photoionization detector Production Well remedial action objective Remedial Action Plan Resource Conservation and Recovery Act standard cubic feet per minute Schedule Southwest Exploration Services, LLC. soil vapor extraction semi-volatile organic compounds trichloroethene Toxicity Characteristic Leaching Procedure total dissolved solids tetrahydrofuran trans-1,2-dichloroethene Treatment, Storage, and Disposal Upper Alluvial Unit U.S. Geological Survey volt volatile organic analysis Additional Site Characterization Work Plan Yellow Jacket Drilling Company Maricopa County Cave Creek Landfill Phoenix, AZ November 19, 2012 Page v Additional Site Characterization Work Plan 1.0 INTRODUCTION This Additional Site Characterization Work Plan (Work Plan) presents a strategy for collecting site characterization information at the closed Maricopa County Cave Creek Landfill (CCL) to support ongoing remedial action planning for trichloroethene (TCE)-impacted groundwater underlying the site. The Work Plan supplements previous remedial investigation work plans prepared to characterize the nature and extent of site contamination, including: − Cave Creek Landfill Groundwater Characterization Work Plan (GCWP) prepared by Bryan A. Stirrat & Associates (BAS) dated August 26, 2005; − Addendum to the Cave Creek Landfill Groundwater Characterization Work Plan (Addendum) prepared by AMEC Environment & Infrastructure (AMEC) dated May 11, 2009; and − Focused Work Plan for Groundwater Characterization near the Old Landfill prepared by Maricopa County Solid Waste Management and dated September 6, 2011. The activities presented in these documents are complete but further information is required to develop a Revised Remedial Action Plan (RAP) for site implementation. The intent of this Work Plan is to: − Document the results of recent site characterization efforts to fulfill requirements of the January 2010 Consent Order (CO) (ADEQ, 2010) between Maricopa County and the Arizona Department of Environmental Quality (ADEQ); − Present the current Conceptual Site Model (CSM) describing the nature and extent of groundwater contamination at CCL; − Identify data gaps required to adequately develop a Revised RAP pursuant to the CO; and − Provide a proposed technical approach, scope of work, and schedule to address identified data gaps for ADEQ review and comment. The following sections summarize relevant background information supporting the review and evaluation of data documented herein. Further background information is presented in the previous remedial investigation work plans identified above. 1.1 Site Description The CCL site is located in Maricopa County, approximately a half mile south of Carefree Highway and two miles west of Cave Creek Road. Site access is from Carefree Highway and the address is 3955 East Carefree Highway, Phoenix, Arizona. Figure 1 presents a recent site aerial with property boundaries and the estimated extent of past landfill operations. Maricopa County Cave Creek Landfill Phoenix, AZ November 19, 2012 Page 1 Additional Site Characterization Work Plan Landfill Construction. CCL consists of two landfill regions located on adjoining properties. The Old Landfill waste placement area is approximately 35 acres in extent and is located on the 40-acre Bureau of Land Management (BLM) property in the northeast portion of the site. There is limited available information regarding construction of this landfill but boring logs from relatively recent soil vapor well installation activities indicate that the cover is approximately 2 ft (ft) thick and the base of waste (which was placed directly on native soil) is at approximately 17 to 22 ft below ground surface (bgs) (SCS Engineers, 2005). At an average surface elevation of 1,897 ft above mean sea level (AMSL), these depths correspond to elevations of 1,875 ft to 1,880 ft AMSL. The New Landfill waste placement area is approximately 32 acres in extent and is located on the 74.7-acre property owned by Maricopa County. The New Landfill was constructed in phases and includes cells constructed before and after federal regulations were promulgated that established minimum technical standards and guidelines for the management of nonhazardous solid waste (i.e., Resource Conservation and Recovery Act [RCRA] Subtitle D). The pre-Subtitle D region includes Cell A in the northern portion of the New Landfill and Cell B in the central portion of the New Landfill (see Figure 1; cell boundaries are approximate). Both of these cells are unlined (the base of waste was placed directly on native soil). Cell C, which is about 5.8 acres in extent, is the post-Subtitle D region of the New Landfill; this cell is underlain with a highdensity polyethylene (HDPE) liner and includes a leachate collection and recovery system (LCRS). The depth of waste in the New Landfill varies by cell: − Cell A: Given boring logs for wells installed in the northern portion of Cell A which indicate the depth to the base of the landfill is approximately 38 to 58 ft bgs (SCE Engineers, 2005) and current topographic survey data for the site (which indicates the surface elevation of Cell A currently ranges from approximately 1,899 to 1,903 ft AMSL), the base of the waste is between 1,843 and 1,863 ft AMSL. This range in elevation includes the elevation for the base of the waste reported in the design drawings for the landfill which is 1,850 ft AMSL (Dames & Moore, 1994). − Cell B: Design drawings for the landfill indicate the base of the waste in Cell B is at approximately 1,820 ft AMSL (Dames & Moore, 1994). According to current topographic survey data for the site, the surface elevation of Cell B ranges from approximately 1,895 to 1,910 ft AMSL which results in a landfill thickness of between75 and 90 ft. − Cell C: The base of the waste in Cell C is approximately 1,820 ft AMSL per landfill design drawings (Dames & Moore, 1994). There are no wells located in Cell C; however, the surface elevation of Cell C is consistent with Cell B so the landfill thickness in this region of the landfill is expected to be comparable to Cell B. The thickness of cover in the New Landfill is 3 ft. A landfill gas (LFG) collection system was installed in Cells A and B of the New Landfill but is not currently in operation. Landfill Operations. CCL began operations in 1965 at the Old Landfill, transitioned to the New Landfill in 1984 and ceased accepting waste in 1998. In the early 1990s, the daily tonnage averaged between 500 and 750 tons per day. The CCL was permitted to accept residential and commercial municipal solid waste (MSU) and other wastes including: appliances, barnyard and Maricopa County Cave Creek Landfill Phoenix, AZ November 19, 2012 Page 2 Additional Site Characterization Work Plan stable waste, demolition material, non-infectious medical waste, domestic animals (large and small), green waste, foods, and inert materials. Other Site Infrastructure. The remainder of the CCL site consists of the currently operating Maricopa County Cave Creek Waste Transfer Station (directly west of the Old Landfill and north of the New Landfill), a buffer zone located to the north, west and south of the New Landfill, and multiple storm water retention areas located throughout the site. The transfer station is open to the public and receives both refuse and recyclables which are temporarily stored in bins and then removed to appropriate off-site facilities on a regular basis. A groundwater production well (PW) is located adjacent to the transfer station; this well was installed in 1982 to supply water for fire and dust control purposes. Figure 2 presents the location of PW and numerous groundwater, LFG, and soil vapor monitoring wells installed to support regulatory compliance and site characterization. The entrance to the CCL site at Carefree Highway is gated and locked during non-business hours. A chain-link fence surrounds the transfer station; other accessible areas are fenced with four-strand barbed wire. Adjacent Land Use. Adjoining properties include Arizona State Trust Land to the north, west and south of the site and the Dove Valley Ranch Golf Course and residential community to the east of the site. Arizona State Trust Land is undeveloped desert; this land is included in the Phoenix Sonoran Preserve Master Plan as open space (City of Phoenix Parks, Recreation, and Library Department, 1998). A golf course club house and maintenance building are located on golf course property directly south of the CCL access road and east of the New Landfill. Newly constructed single-family homes are located along the eastern toe of the New Landfill in the southern portion of the site. The City of Phoenix (COP) provides drinking water to these commercial and residential properties using groundwater wells and surface water supplies sourced from outside the immediate vicinity of CCL. 1.2 Involved Parties Responsibility for CCL site investigation and remediation is shared between two Maricopa County departments. The Maricopa County Waste Resources & Recycling Department (MCWRRM; formerly the Solid Waste Management Department) maintains the closed CCL, performs routine soil vapor and groundwater monitoring, and operates the Cave Creek Waste Transfer Station. The Maricopa County Risk Management Department (MCRM) directs activities conducted to address the CO and has contracted AMEC to investigate environmental impacts of past landfilling operations and support Maricopa County with regulatory compliance. Contact information is provided on the following page: Maricopa County Cave Creek Landfill Phoenix, AZ November 19, 2012 Page 3 Additional Site Characterization Work Plan MCRM Environmental Programs Manager: Address: Phone: Facsimile MCWRRM Manager: Address: Brian Kehoe 2919 West Durango Phoenix, Arizona 85009 (602) 506-8997 (602) 506-8396 Phone: Facsimile AMEC Project Manager: Address: Phone: Facsimile 1.3 Rita Neill, PE 222 North Central Avenue, Suite 1110 Phoenix, Arizona 85004 (602) 506-5063 (602) 506-5939 Natalie Chrisman Lazarr, PE 4600 East Washington Street, Suite 600 Phoenix, Arizona 85034 (602) 733-6000 (602) 733-6100 Project Background Table 1 presents a chronological summary of CCL site history to date, including operational, regulatory and site characterization information. An overview of significant CCL site characterization activities follows: − In response to the detection of TCE in groundwater at concentrations exceeding the Arizona Aquifer Water Quality Standard (AWQS) of 5 micrograms per liter (μg/L) in samples collected from site well MW-1, Maricopa County entered into a CO in 1999 with ADEQ requiring characterization of the nature and source of site groundwater contamination. Preliminary soil vapor and LFG sampling was conducted in 1999 to evaluate potential site contamination; the concentrations of TCE observed in LFG extracted from the New Landfill (2.2 to 2.7 milligrams per cubic meter [mg/m3]) were consistent with concentrations typically present in MSW landfills (BAS, 2008). TCE was also detected at trace levels (0.14 mg/m3) in a shallow soil vapor sample collected from a perimeter well (P well) located southwest of the Old Landfill, in the vicinity of the transfer station. On the basis that low concentrations of TCE were detected in groundwater samples collected from PW in 1985 (only a year after operations began at the New Landfill), Maricopa County’s consultant Dames & Moore concluded that the Old Landfill contained the source of TCE groundwater contamination. − Following installation of soil vapor monitoring wells screened below the Old and New Landfills, soil vapor sampling was conducted in 2004. Results presented in the Soil Vapor Assessment Report, Cave Creek Landfill (SCS Engineers, 2005) indicated the presence of relatively low concentrations of TCE, 1,1-dichloroethene (1,1-DCE), and tetrachloroethene Maricopa County Cave Creek Landfill Phoenix, AZ November 19, 2012 Page 4 Additional Site Characterization Work Plan (PCE) beneath the New Landfill. The primary compounds associated with samples collected from beneath the Old Landfill included 1,1-DCE and PCE. The report concluded that mobilized LFG, contaminated with TCE derived from landfill waste, could be the contaminant pathway responsible for groundwater impacts. LFG is produced during the biological degradation of waste placed in landfills and can migrate from unlined landfills both laterally and vertically due to diffusion, pressure gradients, and the permeability of subsurface strata. − The GCWP prepared by BAS in 2005 further advanced the LFG-groundwater contamination pathway and identified the need for an additional groundwater monitoring well (i.e., MW-3) to define the extent of groundwater impacts. On August 31, 2006, ADEQ issued a letter to Maricopa County accepting the work plan with the provision that additional monitoring wells would need to be installed if MW-3 “…fails its intended purposes of assessment and characterization of the nature and extent of releases.” (ADEQ, 2006). − The GCWP also discussed a video survey that took place in December 2004 at wells MW-1, MW-2, and PW. The video survey was conducted to evaluate well construction and screen conditions after regional water table declines prevented collection of representative groundwater samples in these wells. Video logs indicated groundwater at the time of the video survey was between 676 and 696 ft bgs in MW-2 and PW, respectively. In response to this survey, the casing in PW was perforated with an in-hole perforating tool in January 2005 from 680 to 760 ft below the top of casing (btoc). To accommodate the declining water table, MW-1 and MW-2 were deepened by drilling through the base of these existing wells to 820 and 805 ft bgs, respectively, during January and February 2005. − In August 2007, Maricopa County attempted to raise the dedicated electrical submersible pump in MW-1 for servicing. During the attempted removal, the pump became firmly lodged inside the well casing, rendering it inoperable. Additional attempts to remove the pump were unsuccessful and as a result, sampling of MW-1 is not possible. The last groundwater sample collected from MW-1 was analyzed in June 2007. The well remains unused, but not abandoned. − Meetings between ADEQ and Maricopa County on March 24, 2008 and April 8, 2008 resulted in a general consensus that groundwater characterization was not complete and the installation of additional monitoring wells was necessary to adequately delineate the extent of groundwater contamination at the site. In response, the Addendum prepared by AMEC on behalf of Maricopa County was submitted to ADEQ in May 2009. The purpose of the Addendum was to outline a groundwater characterization approach including the installation of test borings and sampling of associated groundwater in advance of monitoring well completion to appropriately locate permanent monitoring wells. The Addendum also included plans for the vertical characterization of groundwater contamination in MW-2 with passive diffusion bag (PDB) samplers and the adjustment of dedicated pump depths in site monitoring wells to support the collection of samples from comparable depths below the water table across the site. Although the results of many of the activities identified in the Addendum were documented in the Revised Interim Technical Summary Memorandum submitted to ADEQ in August 2011 Maricopa County Cave Creek Landfill Phoenix, AZ November 19, 2012 Page 5 Additional Site Characterization Work Plan (AMEC, 2011a), this Work Plan includes a comprehensive presentation of recent site characterization efforts including: − Groundwater well installation activities conducted since the installation of MW-3 (i.e., the wells proposed in the Addendum, a new well located south of the Old Landfill and a supplementary well located south of the New Landfill in a test boring indicating an elevated concentration of TCE during drilling); − The data derived from ongoing groundwater and soil vapor monitoring activities; − Deep soil vapor well TSSV-1 installation and sampling; and − The results of soil vapor extraction (SVE) testing activities described in the Extended Soil Vapor Extraction Pilot Test Work Plan, Cave Creek Landfill (AMEC, 2011b). Maricopa County Cave Creek Landfill Phoenix, AZ November 19, 2012 Page 6 Additional Site Characterization Work Plan 2.0 DOCUMENTATION OF RECENT SITE CHARACTERIZATION EFFORTS 2.1 Groundwater Well Installation and Sampling 2.1.1 2010-2011 Well Installation Program To define the lateral extent of TCE impacted groundwater downgradient of the New Landfill, the Addendum identified the advancement of up to six test borings on Arizona State Trust Land, south of Maricopa County property, with completion of up to three monitoring wells in test borings based on the results of groundwater sampling during drilling. Planned test borings included: − TB-1 and TB-2 located southeast of MW-2; − TB-3 and TB-4 located southwest of MW-2; and − TB-5 and TB-6 located downgradient/south of MW-2. Four of the six proposed test borings were drilled during the 2010-2011 Well Installation Program and include TB-1, TB-2, TB-4, and TB-5. Three of these borings (TB-2, TB-4, and TB5) were completed as monitoring wells. 2.1.1.1 Test Boring Advancement and Groundwater Sampling Test borings TB-1, TB-4 and TB-5 were drilled by Layne Christensen Company (Layne) between September and December 2010 (see Figure 2 for boring locations). Yellow Jacket Drilling Company (Yellow Jacket) drilled test boring TB-2 between March and May 2011. All test borings were drilled as pilot borings with a 5-1/2 inch (in) outside diameter (OD) bit using air rotary and mud rotary drilling methods. Air rotary was initially used to drill to the water table at the first boring drilled (TB-5), but issues with borehole collapse required a change to mud rotary to maintain borehole stability. Remaining borings were drilled using mud rotary to approximately 50 ft above the water table, after which air rotary was used to minimize the introduction of drilling fluids into the borehole. The borings were visually logged at 10-ft intervals from cuttings. Appendix A presents boring logs. Additional data such as boring headspace photoionization detector (PID) readings, four gas (oxygen, carbon dioxide, carbon monoxide, and methane) meter readings, mud cake wall thickness, mud viscosity and density, vertical deviation, and drilling characteristics were recorded in the field during drilling. The only significant issues noted during drilling were borehole collapse and the need to control airborne dust generation. Small amounts of Hydrogel were used to stabilize the boreholes as needed. Dust control activities were conducted in accordance with a Maricopa County Air Quality Department (MCAQD) dust control permit. TB-1 was drilled to 718 ft bgs and TB-2 was drilled to 720 bgs. TB-4 and TB-5 were drilled to 700 ft bgs. During drilling, groundwater levels were measured at 695.00 ft bgs, 695.75 ft bgs, 681.40 ft bgs, and 686.15 ft bgs in TB-1, TB-2, TB-4 and TB-5, respectively. Groundwater samples were collected from each test boring by airlifting mud and water from the open borehole, allowing groundwater to infiltrate back into the borehole, and then retrieving Maricopa County Cave Creek Landfill Phoenix, AZ November 19, 2012 Page 7 Additional Site Characterization Work Plan approximately 5 gal of groundwater from the top 10 ft of the groundwater table with a decontaminated stainless steel bailer. Collected groundwater was poured directly from the bailer into laboratory-provided volatile organic analysis (VOA) vials preserved with hydrochloric acid (HCl). AMEC submitted ice-preserved samples under chain of custody to Test America in Phoenix, Arizona (Arizona Department of Health Services [ADHS] License Number AZ0728) for volatile organic compound (VOC) analysis by United States Environmental Protection Agency (EPA) Method 8260B. A groundwater sample was not collected from TB-2 due to borehole caving and dust control issues which necessitated mud rotary drilling into the groundwater table. TCE concentrations in grab samples collected from TB-1, TB-4, and TB-5 were 16 µg/L, less than 0.50 µg/L, and 2.3 µg/L, respectively. Full laboratory analytical reports for these samples are provided on Disk 1 (Well Installation Activities). After review of these results by Maricopa County and ADEQ, TB-2, TB-4, and TB-5 were completed as monitoring wells. TB-1 was capped and secured for future consideration as a monitoring well. 2.1.1.2 Monitoring Well Installation and Development Layne installed groundwater monitoring wells MW-4 in TB-5 and MW-5 in TB-4. Yellow Jacket installed MW-6 in TB-2. Figure 2 presents the locations of completed wells. TB-4 and TB-5 pilot borings were over reamed with a 12-1/4 in OD drill bit using reverse circulation mud rotary. Total drill depths for TB-4 and TB-5 were 767 and 768 ft bgs, respectively. The TB-2 pilot boring was over reamed using mud rotary with a 10-5/8 in OD drill bit to 777 ft bgs. Once total depth was achieved for all borings, down-hole geophysics was performed by Southwest Exploration Services, LLC (Southwest Exploration). The logging suite included gamma, caliper, and electric (SP, short and long normal resistivity) logs. Appendix B presents geophysical logs. MW-4, MW-5 and MW-6 are constructed of 6-in diameter low carbon steel (LCS) casing and are completed as follows: − MW-4 is screened from 667.5 to 752.7 ft bgs; − MW-5 is screened from 660.0 to 740.2 ft bgs; and − MW-6 is screened from 675.0 to 764.4 ft bgs. The well screens are comprised of vertical 0.125-in slots. Sumps are present at the bottom of the screens. Table 2 summarizes construction information for each well including well casing materials, screened intervals, and corresponding ADWR well numbers. A construction diagram for each monitoring well is included in Appendix C. Prior to annular material installation, the drillers thinned out the drilling fluid with water to remove mud from the borehole and well screens. Annular materials in MW-4 and MW-5 consist of: − Gravel pack (3/8-in Tacna Gravel) installed in the screened interval; − 8-12 mesh Colorado silica sand for the transition seal; Maricopa County Cave Creek Landfill Phoenix, AZ November 19, 2012 Page 8 Additional Site Characterization Work Plan − Hydrated bentonite pellets (Pel-Plug 1/4-in TR30) for the bentonite seal; and − Cement-bentonite grout from the bentonite seal to the surface. Annular materials in MW-6 consist of: − Gravel pack (TSG 3/8-in x 3/16-in) installed in the screened interval; − 10-20 mesh Colorado silica sand for the transition seal; − Hydrated bentonite pellets (Pel-Plug 1/4-in pellets TR30) for the bentonite seal; and − Cement-bentonite grout from the bentonite seal to surface. Materials were installed via tremie. The gravel pack was surged to prevent bridging prior to installation of the transition and bentonite seals. Continuous tagging of the material was performed throughout installation. Once annular materials were installed, air lifting was performed to flush out the screened interval/gravel pack and remove any residual mud or sediment. The surface of each well was then completed with an above-ground, lockable steel monument and four surrounding concrete bollards to protect the monument. During surging in MW-6, the surge block was detached from the cable line and fell to the bottom of the well. Yellow Jacket was able to retrieve the surge block; however, retrieval efforts resulted in shifting the well casing down into the borehole by approximately 8 ft from the original installed position. To accommodate this shift, additional blank well casing was added to the top of the well and a perforating tool was used to extend perforations from 675 to 682.5 ft bgs in the blank casing above the installed well screen. MW-4, MW-5 and MW-6 were developed using the surge, bail and pump method. The wells were surged and bailed until the water in the casing at the bottom of the wells was generally free of sediment. A decontaminated 4-in diameter submersible stainless steel Grundfos development pump with discharge piping was then installed in each well and pumped within the screened interval. Development continued in MW-4 until the water pumped from the well was visually clear of fine sediment and mud. The results of water quality monitoring including pH, conductivity, temperature, and turbidity were used to determine the duration of development at MW-5 and MW-6. Pumping continued until readings stabilized and water clarity was as best as could be attained. Following development, new 4-in diameter submersible stainless steel Grundfos pumps with 1¼-in galvanized steel discharge piping and associated motor leads were installed in each well. Target pump installation depths were within the screened interval and approximately 20 ft below the water table. A free-hanging 1¼-in diameter polyvinyl chloride (PVC) sounding tube, suspended from each well cap was also installed during pump installation activities. Due to the loss of the surge block in MW-6 during placement of annular material, Southwest Exploration conducted a video log of MW-6 after development and prior to pump installation to verify the integrity of the well screen/casing and document the perforations made by the perforating tool; the log confirmed that the screen and casing had not been damaged during surge block removal efforts. Maricopa County Cave Creek Landfill Phoenix, AZ November 19, 2012 Page 9 Additional Site Characterization Work Plan Maricopa County surveyed MW-4, MW-5, and MW-6 following the completion of pump installation activities. Table 2 summarizes survey information including top of sounder casing elevations used in calculating groundwater elevations. 2.1.1.3 IDW Management During drilling and well installation activities, investigation derived waste (IDW) consisted of soil cuttings, drilling fluids (i.e., mud and formation water), development water and a negligible quantity of solid waste (e.g., drilling and annular material supply bags). Soil cuttings were contained in lined roll-off bins and drilling fluids/development water were contained in poly tanks. Soil cuttings generated above and below the groundwater table were segregated in separate roll-off bins. Since the borings were advanced in undeveloped desert, cuttings generated above the water table were characterized based on source as clean fill and immediately transported to Maricopa County CCL property where they were deposited in the buffer zone west of the New Landfill. Cuttings generated below the water table were segregated by boring and temporarily stored until results from groundwater well sampling activities were available. After reviewing the results of associated groundwater well sampling analytical data which indicted that none of the completed wells contained concentrations of contaminants in groundwater exceeding applicable AWQS values, soil cuttings generated below the water table, drilling fluids, and development water were transported to Maricopa County CCL property and deposited in the buffer zone west of the New Landfill. Analytical results for collected groundwater samples are summarized in Appendices E and F; full laboratory analytical reports for these samples are provided on Disk 1 (Groundwater Sampling). Solid waste was temporarily stored in garbage bags and then disposed of at the Cave Creek Waste Transfer Station as MSW. 2.1.2 2011-2012 Well Installation Program Following a June 28, 2011 meeting between ADEQ and Maricopa County to discuss site characterization activities, conversion of TB-1 to a permanent monitoring well location was reconsidered. It was believed that this well would be useful in delineating TCE-impacted groundwater in the vicinity of the residential neighborhood east of the New Landfill. The well was identified as MW-7 and added to a planned drilling program to assess whether groundwater downgradient of the Old Landfill is impacted. Maricopa County identified the planned well south of the Old Landfill as MW-8. 2.1.2.1 Monitoring Well Installation and Development Installation of groundwater monitoring well MW-7 in TB-1 and MW-8 south of the Old Landfill (see Figure 2) was conducted between December 2011 and February 2012. Yellow Jacket drilled both wells using the mud rotary drilling method. TB-1 was over reamed with a 12-3/4 in OD drill bit to 765 ft bgs. The soil boring for MW-8 was drilled using a 15-in OD drill bit to 766 ft bgs. During drilling, the boreholes were logged from cuttings every ten ft to total depth. Only the deepened portion of the MW-7 over reamed borehole was logged during the 2011-2012 Well Installation Program since this boring as TB-1 had already been logged. Appendix A presents Maricopa County Cave Creek Landfill Phoenix, AZ November 19, 2012 Page 10 Additional Site Characterization Work Plan boring logs. Additional data such as boring headspace PID readings, four gas meter readings, mud cake wall thickness, mud viscosity and density, vertical deviation, and drilling characteristics were recorded in the field during drilling. No significant issues based on the results of monitoring were noted. Once total depth was achieved, Southwest Exploration logged the boreholes using down-hole geophysics prior to well installation activities. The logging suite included gamma, caliper, and electric logs in both MW-7 and MW-8. A sonic log was also conducted in MW-8 to evaluate the depth to groundwater and assist in well screen placement. Based on the sonic log, groundwater was estimated to be at approximately 715 ft bgs. Geophysical logs are included in Appendix B. MW-7 and MW-8 are constructed of 8.25-in diameter LCS casing and are completed as follows: − MW-7 is screened from 674.8 to 754.8 ft bgs; and − MW-8 is screened from 691.5 to 761.5 ft bgs. The well screens are comprised of vertical 0.125-in slots. Sumps are present at the bottom of the screens. Table 2 summarizes construction information for each well including well casing materials, screened intervals, and corresponding ADWR well numbers. A construction diagram for each monitoring well is included in Appendix C. Once the well casings were emplaced, the driller thinned out the drilling fluid with water to remove mud from the borehole and well screens. Annular materials were installed via tremie and included: − Gravel pack (TSG 3/8-in x 3/16-in) installed in the screened interval; − 8-12 mesh Colorado silica sand for the transition seal; − Hydrated bentonite pellets (3/8-in coarse grade Holeplug) for the bentonite seal; and − Cement-bentonite grout from the seal to the surface. The gravel pack was surged to prevent bridging prior to installation of the transition and bentonite seals. Once annular materials were installed, air lifting was performed to flush out the screened interval/gravel pack and remove any residual mud or sediment. The surface of each well was then completed with an above-ground, lockable steel monument and four surrounding concrete bollards to protect the monument. MW-7 and MW-8 were developed using the surge, bail and pump method. The wells were surged and bailed until the water in the casing at the bottom of the wells was generally free of sediment. A decontaminated 4-in diameter submersible stainless steel Grundfos development pump with discharge piping was then installed in each well and pumped within the screened interval. The results of water quality monitoring including pH, conductivity, temperature, and turbidity were used to determine the duration of development. Pumping continued until readings stabilized and water clarity was as best as could be attained. Following development, new 4-in diameter submersible stainless steel Grundfos pumps with 2-in galvanized steel pump discharge piping and associated motor leads were installed in each well. Target pump Maricopa County Cave Creek Landfill Phoenix, AZ November 19, 2012 Page 11 Additional Site Characterization Work Plan installation depths were within the screened interval and approximately 20 ft below the water table. A free-hanging 1½-in diameter PVC sounding tube, suspended from each well cap was also installed during pump installation activities. After installation activities were complete, the pumps were tested to confirm they were functional. The wells were also sampled at this time. Water quality parameters, water level measurements, and flow rates were also recorded. Once stabilization of the parameters was achieved and three well volumes were purged, a groundwater sample was collected from both wells. AMEC submitted ice-preserved samples under chain of custody to Test America in Phoenix, Arizona (ADHS License Number AZ0728) for VOC analysis by EPA Method 8260B. Further discussion regarding these groundwater results is presented in Section 2.1.3. Maricopa County surveyed MW-7 and MW-8 following the completion of pump installation activities. Table 2 summarizes survey information including top of sounder casing elevations used in calculating groundwater elevations. 2.1.2.2 IDW Management As in previous well installation programs, soil cuttings were contained in lined roll-off bins and segregated by well and depth interval (above or below the water table). Drilling fluids (i.e., mud and formation water) as well as development water were contained in poly tanks. Since MW-8 was installed immediately adjacent to the Old Landfill, grab samples of cuttings (both above and below the water table) and drilling fluids were collected to determine an appropriate management strategy for the waste (cuttings and liquids associated with MW-7 were also sampled for completeness). AMEC submitted ice-preserved and methanol-extracted (cuttings only) samples under chain of custody to Test America in Phoenix, Arizona (ADHS License Number AZ0728) for VOC analysis by EPA Method 8260B. Sample results indicated no reportable concentrations of VOCs in cuttings generated from either MW-7 or MW-8. Development water contained low levels of toluene (3.1 µg/L) which is well below the applicable AWQS of 1,000 µg/L for this compound. Full laboratory analytical reports for these samples are provided on Disk 1 (Well Installation Activities). On the basis of these results, all cuttings, drilling fluids and development water were transported to Maricopa County CCL property and deposited in the buffer zone west of the New Landfill. All solid waste generated during the drilling program was temporarily stored in garbage bags and then disposed of at the Cave Creek Waste Transfer Station as MSW. 2.1.3 Groundwater Monitoring As presented in Figure 2, the CCL groundwater monitoring well network consists of wells located at CCL and surrounding properties. MW-1 and MW-2 were the first CCL monitoring wells installed and were completed in May 1993 to support landfill permitting. Detection of elevated concentrations of TCE at MW-1 in December 1997 prompted Maricopa County to enter into a CO with ADEQ to characterize the nature and source of site groundwater contamination. In order to adequately evaluate groundwater impacts, ADEQ and Maricopa County agreed that Maricopa County Cave Creek Landfill Phoenix, AZ November 19, 2012 Page 12 Additional Site Characterization Work Plan additional monitoring wells were needed. Maricopa County installed MW-3 to fill a data gap to the east of CCL in 2007 and MW-4 through MW-7 south of the New Landfill from 2010 through 2012 to define the southern extent of the groundwater plume (see Sections 2.1.1 and 2.1.2). MW-8 was installed south of the Old Landfill along the site access road in 2012 to evaluate whether the Old Landfill is contributing to groundwater contamination (see Section 2.1.2). As of August 2007, collection of groundwater samples from MW-1 has not been possible; the well is obstructed by the dedicated well pump which is firmly lodged in the well (multiple attempts to remove the pump have been unsuccessful). The site groundwater monitoring program currently consists of monthly groundwater level gauging and quarterly groundwater sampling of the CCL monitoring well network. Groundwater gauging is conducted using a water level well indicator in dedicated sounding tubes; all depths to groundwater are referenced from permanent, surveyed measurement points (i.e., the northern rim of the sounding tube) and measured to the nearest 0.01 foot (see Table 2 for survey data). During quarterly groundwater sampling activities, three well volumes are purged from the wells prior to sampling using dedicated groundwater pumps. Temperature, pH, and specific conductivity measurements are measured to evaluate stabilization during well purging; these measurements are recorded in field documentation. Groundwater samples collected at the conclusion of purging are analyzed for VOCs plus acrolein, acrylonitrile, and 2-chloroethyl vinyl ether by EPA Method 8260B. In addition, samples are analyzed for total dissolved solids (TDS) by SM2540C, metals by EPA 200.7, nitrite by SM4500-NO2B, inorganic anions by EPA 300, and alkalinity as calcium carbonate (CaCO3) by SM2320B. Appendices E and F summarize the results of analysis for compounds present at reportable concentrations in groundwater since 1985. Due to the duration of record, the data are produced by multiple laboratories with varying analyte lists. Laboratory analytical reports for samples collected since 2009 are provided on Disk 1 (Groundwater Sampling). Purge water generated from quarterly groundwater sampling activities is currently contained during purging in a portable 1,500-gallon (gal) water tank. Management of purge water is based on the analytical data collected during the previous groundwater monitoring event. If the groundwater samples collected from a well indicate that all VOC concentrations are less than applicable AWQS values, the water is used for dust control on Maricopa County CCL property or it is discharged into CCL retention basins. If there is a possibility that any of the AWQS values are exceeded, the purge water extracted from the associated well is transferred from the portable tank into a 5,000-gal tank located on Maricopa CCL property for temporary storage. The contained water is sampled for VOCs by EPA Method 8260B. If results indicate that AWQS values are exceeded, the water is removed by a subcontractor for treatment and permitted discharge to the COP sanitary sewer. In June of 2009, Maricopa County conducted vertical characterization of VOCs in groundwater via PDB sampling in MW-2. PDBs filled with deionized water were suspended in MW-2 at depths of 695 ft bgs (1,161 ft AMSL), 715 ft bgs (1,141 ft AMSL), and 735 ft bgs (1,121 ft AMSL) on May 21, 2009. On June 9, 2009 (nineteen days later), the PDBs were retrieved and the Maricopa County Cave Creek Landfill Phoenix, AZ November 19, 2012 Page 13 Additional Site Characterization Work Plan contents were analyzed for VOCs by EPA Method 8260B. The depth to groundwater at the time of monitoring was 690 ft bgs. 2.1.3.1 Groundwater Elevation Appendix D presents available depth to water measurements for all monitored wells from 2001 to date. Table 3 summarizes corresponding groundwater elevation data. Hydrographs depicting changes in groundwater elevation over time are presented in Figure 3. Although there is some variability in the data (particularly in early 2005 when a water level indicator malfunctioned), the hydrographs show a steady decline in groundwater elevations over time due likely to regional groundwater withdrawal activities. From 1993 to September 2012, the average decline in groundwater elevations at CCL was approximately 3.7 to 3.9 ft per year (based on PW and MW2 data). As of the past two years (September 2010 through September 2012), the rate of decline has slowed to approximately 1.2 ft per year. 2.1.3.2 Groundwater Gradient and Direction Groundwater elevations at PW, MW-2 MW-3, MW-4, MW-5, MW-6, MW-7, and MW-8 are used to estimate groundwater flow gradient and direction at CCL. These parameters are currently calculated on a monthly basis (following monthly groundwater gauging) using the EPA On-line Tools for Site Assessment Calculation (EPA, 2012). Estimates of groundwater flow direction and gradient based on these calculations are reported in Table 3 along with groundwater elevation data for all monitored wells from 2005 to date (availability of consistent data prior 2005 is limited). Flow direction is measured in a clockwise rotation from north; north is 0 degrees, east is 90 degrees, south is 180 degrees, and west is 270 degrees. Calculated gradients since 2005 range from 0.002 to 0.009 ft/ft; the average gradient is 0.003 ft/ft. These data indicate the groundwater gradient at the site is relatively flat and does not vary significantly. From 2005 to date, the calculated groundwater flow direction has ranged from 92 to 266 degrees from north. The average groundwater flow direction during this period is 159 degrees from north. These data indicate that although groundwater flow at the site fluctuates from east to west, the predominant direction of groundwater flow is to the south to southeast. Fluctuations in gradient and flow direction are potentially a response to regional groundwater withdrawals (predominantly from municipal wells located to the east and southeast of the site), large precipitation events, and storm water runoff recharge. Additional discussion is presented in Section 3.1. Figure 4 presents the interpreted potentiometric surfaces for the monitored water-bearing zone and the associated groundwater gradient and flow directions on December 2011, January 2012, March 2012, and May 2012. The dates selected represent recent data sets over time with the most complete spatial coverage. These include measurements from wells installed as part of the 2010-2011 Well Installation Program. As shown in Figure 4, groundwater flow has been close to due south since January 2012. Maricopa County Cave Creek Landfill Phoenix, AZ November 19, 2012 Page 14 Additional Site Characterization Work Plan 2.1.3.3 Groundwater Quality TCE Concentrations over Time. Pursuant to the CO, TCE is the primary contaminant of concern (COC) in groundwater at CCL; based on the results of groundwater monitoring, this compound is the most prevalent groundwater contaminant at the site. A summary of TCE concentrations in groundwater over time is presented in Table 4. Figure 2 presents the locations of monitored wells. TCE has been detected in site groundwater since 1985 when sampling of PW began. This well was installed in 1982 for water supply purposes; no data are available prior to this date. Installation of the first groundwater monitoring wells at the site (MW-1 and MW-2) indicated reportable concentrations of TCE in 1997 when relatively routine groundwater monitoring began. TCE concentrations reported in these wells varied significantly from 1997 until 2005 when sustained and increasing TCE concentrations were detected in MW-1. MW-2 indicated a significant and sustained increase in TCE concentrations in 2007. As a result of these observations, wells MW-3 through MW-7 were installed to define the extent of impacted groundwater south of the site. TCE concentrations at four of these wells, MW-3, MW-5, MW-6 and MW-7, remain low. Concentrations at MW-4 are slightly elevated and appear to be increasing. A summary of ranges in TCE concentrations in samples collected from site wells follows: Well Minimum TCE Concentration PW MW‐1 < 1.9 µg/L < 2 µg/L MW‐2 <2 µg/L MW‐3 MW‐4 MW‐5 MW‐6 MW‐7 MW‐8 <0.5 µg/L 4.7 µg/L <0.5 µg/L 0.9 µg/L <0.5 µg/L <0.5 µg/L Date(s) Observed November 1985 to December 1987 June 1993, March 1999 and August 1999 Multiple dates in 1993 and 2000 through 2006 Multiple dates in 2008 to 2010 May 2011 From installation to date May 2011 From installation to date From installation to date Maximum TCE Concentration Date Observed 464 µg/L 75 µg/L November 2011 April 2007 450 µg/L April 2010 2.6 µg/L 32.6 µg/L <0.5 µg/L 2 µg/L <0.5 µg/L <0.5 µg/L November 2011 August 2012 From installation to date February and May 2012 From installation to date From installation to date Other Compounds Present in Site Groundwater. In addition to TCE, the following 12 organic compounds and 10 inorganic compounds have been detected in groundwater collected from site monitoring wells since 1985: 1,1-Dichloroethane (1,1-DCA) 1,1-DCE Benzene Bromoform Carbon disulfide Chlorobenzene Chloroform Maricopa County Cave Creek Landfill Phoenix, AZ cis-1,2-Dichloroethene (cis-1,2-DCE) PCE Toluene trans-1,2-Dichloroethene (trans-1,2-DCE) Vinyl chloride Calcium Chloride Fluoride November 19, 2012 Iron Magnesium Nitrate (as n) Nitrite Potassium Sodium Sulfate Page 15 Additional Site Characterization Work Plan Significant changes in the concentrations of inorganic compounds that are typically indicative of landfill leachate impacts (e.g., chloride, sulfate, alkalinity etc.) were not apparent in site groundwater. Appendices E and F summarize reportable site groundwater concentrations. Full laboratory analytical reports for samples collected since 2009 are provided on Disk 1 (Groundwater Sampling). Compounds present at concentrations exceeding respective AWQS values are as follows: COC Well Range in Concentration AWQS TCE PCE 1,1‐DCE cis‐1,2‐DCE Vinyl Chloride MW‐1, MW‐2, MW‐4, and PW MW‐2 and PW MW‐2 and PW PW PW <0.5‐464 µg/L <0.5‐23.7 µg/L <0.5‐15.8 µg/L <0.5‐164 µg/L <0.5‐10.3 µg/L 5 µg/L 5 µg/L 7 µg/L 70 µg/L 2 µg/L The maximum concentrations reported above are all associated with a single sampling event and well: a sample collected from PW on November 2011 during the Extended SVE Pilot Test. Although elevated concentrations of TCE, PCE, and 1,1-DCE have been detected during other sampling events, cis-1,2-DCE and vinyl chloride have not been detected in groundwater at concentrations exceeding their respective AWQS values in any other samples collected from the site. The Extended SVE Pilot Test included a short period of vapor extraction from PW in the screened interval above the water table which may have contributed to elevated concentrations of VOCs in groundwater due to upwelling and/or the discharge of SVE condensate into the well. A more detailed discussion of this event and its effect is presented in Section 2.3.2. Excluding the November 2011 sample collected from PW, PCE and 1,1-DCE have only been detected at concentrations exceeding the respective AWQS values in MW-2. In this well, concentrations of PCE first exceeded the AWQS of 5 µg/L in April 2010; 1,1-DCE was first detected above the AWQS of 7 µg/L in May 2011. While concentrations of these compounds have fluctuated above and below the respective AWQS values since these dates, levels remain elevated. VOC Concentration Variation with Depth. Appendix E summarizes the results of PDB sampling conducted at MW-2 in 2009. TCE concentrations in samples collected approximately 5 ft, 25 ft, and 45 ft below the top of the groundwater table were 190/150 µg/L, 170 µg/L, and 99 µg/L, respectively (duplicate samples were collected at 5 ft below the top of the groundwater table). These data suggest that TCE concentrations are highest near the vadose zone/groundwater interface and decrease with depth. Other VOCs present in PDB samples included 1,1-DCE, cis-1,2-DCE, and PCE but concentrations were significantly lower and no trend with depth was evident. It is notable that concentrations reported in PDB samples were not generally consistent with quarterly monitoring data collected via pumping the well with dedicated groundwater extraction pumps. TCE concentrations were lower and cis-1,2-DCE concentrations were higher in PDB samples. Further discussion of the nature and extent of impacted groundwater is provided in Section 3.2.1.2. Maricopa County Cave Creek Landfill Phoenix, AZ November 19, 2012 Page 16 Additional Site Characterization Work Plan 2.2 Soil Vapor Well Installation and Monitoring Activities 2.2.1 2009 Soil Vapor Survey 2.2.1.1 Shallow Soil Vapor AMEC conducted shallow soil vapor monitoring in early December 2009 to evaluate the distribution of VOCs at the site and provide additional data useful in locating a planned deep soil vapor monitoring well. Each well was purged of three vapor volumes prior to sampling with analysis of samples collected in laboratory-supplied Summa canisters by EPA Method TO-15. Appendix G, H and I summarize associated results and Disk 1 (Soil Vapor Sampling) presents full laboratory analytical reports. Data compiled from previous shallow soil vapor activities conducted in 2004, 2005, and 2008 by SCS Engineers (via EPA Method 8260B) are presented in these appendices for reference (data are identified by date). VOC data collected in 2009 suggest that concentrations vary with location and depth at the site: − In former LFG extraction wells located in the New Landfill (identified by the prefix of GW), TCE concentrations ranged from 1 to 1.9 mg/m3. − P Well sampling was conducted at P-02 (south of the New Landfill) and P-18 (west of the New Landfill). Concentrations of TCE ranged from 1.6 mg/m3 at P-02-S to 2.4 mg/m3 at P18-D. − Soil vapor monitoring below the base of the Old and New Landfills (ODP-01 through ODP-4 and NDP-01 and NDP-02, respectively) revealed relatively significant concentrations of TCE. The highest TCE concentrations were indicated at depth below the New Landfill. TCE was detected at 95 mg/m3 in NDP-01-D. This well is the most northern New Landfill well (see Figure 2). The highest TCE concentration detected in the Old Landfill was 21 mg/m3 at ODP-01-D (this well is located in the northeast quadrant of the Old Landfill). 2.2.1.2 Deep Soil Vapor Prior to installation of the planned deep soil vapor monitoring well, AMEC collected deep soil vapor samples in May 2009 from the screened interval above the water table in groundwater wells MW-2 and PW. These wells both have significant diameters and are screened at depths greater than 630 ft bgs. To promote the collection of representative samples from these wells, the sounding tubes and dedicated pumps in these wells were removed and temporary well packers (TAM International Part No. 550-LW-01) were installed to isolate soil vapor sampling locations. Installation details are as follows: Well Screened Interval Top of Packer Assembly* Depth to Water MW‐2 PW 630 – 805 ft bgs 680 – 810 ft bgs 670 ft bgs 683 ft bgs 690 ft bgs on 5/19/09 708 ft bgs on 5/20/09 * The length of the dual packer assembly was approximately 8 to 10 ft. Each well was purged of five well volumes prior to sampling with analysis of samples collected in laboratory-supplied Summa canisters by EPA Method TO-15. Results are presented in Maricopa County Cave Creek Landfill Phoenix, AZ November 19, 2012 Page 17 Additional Site Characterization Work Plan Appendix G, H and I and Disk 1 (Soil Vapor Sampling) presents full laboratory analytical reports. Concentrations of TCE ranged from 0.110 mg/m3 at MW-2 to 180 mg/m3 at PW. Review of these data indicate that despite elevated groundwater concentrations at MW-2, deep soil vapor TCE concentrations appeared to be higher in the vicinity of PW, located in the northern portion of the site. 2.2.2 Soil Vapor Well Installation and Sampling Nested soil vapor monitoring wells TSSV-1-S, TSSV-1-M, and TSSV-1-D were installed to evaluate the concentration of VOCs in the deep vadose zone below the existing vapor monitoring network at the site in 2009. The wells were designed to serve as future soil vapor extraction wells, as required. Prior to the installation of these wells, the screened interval of the deepest soil vapor wells was 130 to 140 ft bgs. 2.2.2.1 TSSV-1 Installation The drilling contractor, Layne, began drilling the boring for the TSSV-1 soil vapor monitoring wells in the northeastern corner of the transfer station on December 16, 2009. Caving issues were immediately encountered using air rotary with an open hole. On December 19, 2009, drilling was suspended so that the drilling method could be re-evaluated. On January 12, 2010, Layne recommenced drilling using Stratex with advance casing to keep the borehole open. The boring was visually logged every ten ft from cuttings. Lithology, boring headspace PID readings, four-gas meter readings, and drilling characteristics were recorded on boring logs during drilling activities. Appendix A presents boring logs. The borehole was drilled to a total depth of 610 ft bgs. Well construction activities began on January 21, 2010. Three nested 2-in diameter Sch 80 PVC soil vapor monitoring wells with 0.100-in slotted screen were installed in the boring. Screened intervals were completed as follows: − Shallow zone (TSSV-1-S) – 150 to 200 ft bgs; − Middle zone (TSSV-1-M) – 350 to 400 ft bgs; and − Deep zone (TSSV-1-D) – 549 to 599 ft bgs. The deep zone well was screened a sufficient height above the groundwater table to limit groundwater upwelling during planned soil vapor extraction activities. Installed annular materials included: − Gravel pack (3/8-in x 3/16-in) placed within the screened intervals; − Hydrated 1/4-in bentonite pellets for the bentonite seal placed between the screened intervals; and − Cement-bentonite grout placed between the bentonite seals and from the top of the top bentonite seal to ground surface. Maricopa County Cave Creek Landfill Phoenix, AZ November 19, 2012 Page 18 Additional Site Characterization Work Plan TSSV-1 was completed with a 12-in flush-mounted well monument recessed in a 3 by 3 by 4-ft concrete pad. Sample ports were installed at each wellhead and marked appropriately to designate the associated screened interval. Maricopa County surveyed the location of TSSV-1 following completion of well installation activities. Table 2 summarizes survey information including top of casing elevations used in calculating soil vapor monitoring elevations. During drilling and well installation activities, soil cuttings were contained in lined roll-off bins. The bins were emptied in the buffer zone west of the New Landfill. 2.2.2.2 Initial TSSV-1 Sampling After installation of TSSV-1 in northeast corner of the transfer station, AMEC sampled TSSV-1 on February 23, 2010. Each well port was purged for a minimum of three well volumes at approximately 15 liters per minute (L/min). During purging, field readings were collected using a flame ionization detector (FID) and four gas meter approximately every five minutes during purging. The samples were collected in Summa canisters and submitted under chain of custody to Air Toxics, Ltd. for analysis of VOCs using Test Method TO-15 and analysis for methane, carbon dioxide and oxygen using Modified ASTM D-1946. VOC analytical results are summarized in Appendix G, H and I and indicate that TCE concentrations ranged from 74 mg/m3 in TSSV-1-D to 130 mg/m3 in TSSV-1-S. Other compounds present at comparable concentrations included cis-1,2-DCE in TSSV-1-D at 240 mg/m3. Disk 1 (Soil Vapor Sampling) presents the full laboratory analytical report. Analytical results for evaluated gases are summarized below: − Methane concentrations increased with depth ranging from 0.013% by volume at TSSV-1-S to 1% by volume at TSSV-1-D; − Oxygen concentrations decreased with depth ranging from 5.3% by volume at TSSV-1-D to 16% by volume at TSSV-1-S; and − Carbon dioxide concentrations increased with depth ranging from 2.4% by volume at TSSV1-S to 14% by volume at TSSV-1-D. These results indicate that significant soil vapor concentrations of TCE are present at depth in the region between the Old and New Landfills and that biologically mediated reductive dechlorination of TCE is occurring at depth and/or that these activities have occurred in the past in the landfills and associated indicators of reductive dechlorination and reduced conditions (i.e., cis-1,2-DCE, methane and carbon dioxide) have migrated as vapors to depth. 2.2.3 2012 Eastern Perimeter Well Sampling In early 2012, AMEC collected supplementary vapor samples from P-3, P-6, P-7, P-8, P-9 and P-10 to evaluate concentrations of VOCs along the eastern CCL property boundary (see Figure 2). These 3-in diameter wells are currently used for routine LFG monitoring which is conducted on a quarterly basis in accordance with 40 CFR §258.23. P-10 is the most northern well and P-3 Maricopa County Cave Creek Landfill Phoenix, AZ November 19, 2012 Page 19 Additional Site Characterization Work Plan is the most southern well in the north-south alignment (P-5 is inaccessible and was not sampled). Well construction details used in purge calculations are presented in Table 2 (depths are approximate; limited construction information regarding these wells is available). All the wells are equipped with sealed well caps and dedicated, air-tight valves. Decontaminated three-way valves (supplied by the laboratory) and new ¼-in inside diameter (ID) tubing were used to construct purging and sampling assemblies for each well. Prior to sample collection, AMEC purged the wells of two calculated well volumes at a rate of 5 L/min using an electric vacuum pump. An in-line rotameter was used to measure the flow of the pump. Readings from a PID calibrated in the field with isobutylene and a four gas meter were collected from the sample flow after purging, but prior to sampling. PID readings ranged from 0 ppmV at P-3 to 7.9 ppmV at P-9. The concentrations of carbon monoxide, hydrogen sulfide, and methane were all 0% by volume while the concentrations of oxygen at all sampled locations were fairly consistent at an average value of 20.6% by volume. AMEC collected P Well soil vapor samples in laboratory-supplied 1-Liter (L) Summa canisters equipped with critical orifice assemblies that regulated flow during sampling to approximately 200 milliliters per minute (mLs/min). The vacuum of each canister was measured with a vacuum gauge supplied by the laboratory prior to connecting the canister to the sampling assembly. To conduct leak detection testing, the sampling assemblies were exposed to a commercial dusting product containing 1,1-difluoroethane during sampling at each location (all samples were evaluated for 1,1-difluoroethane for this purpose; this compound was not detected in any of the collected samples). The soil vapor samples were submitted under chain of custody to Airtech Environmental Laboratories (AEL) which is an ADHS-licensed laboratory (No. AZ0740). The samples were analyzed using EPA Method TO-15 for VOCs. Appendix G, H and I summarize soil vapor sample analytical results and Disk 1 (Soil Vapor Sampling) presents full laboratory analytical reports. P Well sampling conducted in 2012 indicates that: − A wide range of VOCs are present at trace levels in the eastern boundary P wells including acetone, benzene, 2-butanone (MEK), chloroform, 1,1-DCE, Freon-11, Freon-12, Freon113, hexane, PCE, TCE, toluene, 1,2,4-trimethylbenzene, and o-xylene. − During the 2012 sampling events, the most prevalent contaminant was PCE (concentrations ranged from 0.0054 to 1.8 mg/m3) which was detected in all evaluated samples except P-3. The highest VOC concentration observed was TCE at P-9 (59 mg/m3) which is completed to 51 ft bgs. The only other well with a reportable concentration of TCE was P-10 (0.752 mg/m3) which is located in the vicinity of P-9 but is completed to 20 ft bgs. These data indicate that soil vapor TCE concentrations are higher at depth and significantly abated at shallower depths. − Data collected at P-9 and P-10 suggest that elevated TCE concentrations in shallow soil gas are present directly south of the transfer station and adjacent to the New Landfill. The TCE concentrations observed at these wells are consistent with the TCE concentrations detected during 2009 and 2011 shallow vapor well monitoring conducted below the Old and New Landfills. As shown in Appendix G, TCE concentrations in the ODP and NDP wells screened Maricopa County Cave Creek Landfill Phoenix, AZ November 19, 2012 Page 20 Additional Site Characterization Work Plan from 80 to 90 ft bgs ranged from 1.9 mg/m3 to 60 mg/m3 (this screened interval is comparable in elevation but approximately 10 to 15 ft deeper than the sampling elevation of P-9). 2.3 Soil Vapor Extraction Testing Two SVE tests have been conducted at the site to date. A One Day Preliminary SVE Test was conducted to gather data for planning future testing and an Extended SVE Pilot Test was conducted to evaluate whether extended extraction from test wells would provide insight into the nature and extent of deep soil vapor contamination at the site. The following sections present an overview of test conditions and associated results with inferences regarding site characterization and soil vapor extraction at the site. 2.3.1 One Day Preliminary SVE Pilot Test 2.3.1.1 Description of Test Operations AMEC conducted the One Day Preliminary SVE Test on June 16, 2010 using a trailer-mounted SVE blower system (two 7.5-HP ROTRON blowers plumbed in parallel), portable generator, and treatment vessel filled with 1,000 pounds (lbs) of vapor-phase granular activated carbon (VGAC). The blower system was rated to supply a maximum flow rate of 300 standard cubic ft per minute (scfm) and a maximum vacuum of approximately 95 in of water column (in-H2O). All extracted soil vapors were treated using V-GAC prior to discharge to the atmosphere. Tested SVE wells included the three 2-in diameter TSSV-1 deep soil vapor wells (i.e., TSSV-1S, TSSV-1-M, and TSSV-1-D) and PW (an 8-inch diameter groundwater well); see Figure 2 for test well locations. Corresponding screened intervals are as follows: − TSSV-1-S is screened from 150 to 200 ft bgs (1,681 to 1,731 ft AMSL); − TSSV-1-M is screened from 350 to 400 ft bgs (1,481 to 1,531 ft AMSL); − TSSV-1-D is screened from 549 to 599 ft bgs (1,282 to 1,332 ft AMSL); and − PW is screened from 680 to 810 ft bgs but the depth to water on the day of testing was 709 ft bgs (under static conditions) – therefore the tested screened interval was no greater than 680 to 709 ft bgs (1,071 to 1,201 ft AMSL). Testing consisted of an initial 10-minute (min) vacuum test to assess the maximum vacuum achievable by the SVE system, followed by independent step testing at various vacuums in TSSV-1 and PW. Testing began in TSSV-1; the three TSSV-1 wells were manifolded into in a single extraction line to allow for extraction from all three TSSV-1 wells simultaneously at the same system vacuum. The maximum achievable vacuum in this configuration was 30 in-H2O. Step testing included testing at system vacuums of 10, 20, and 30 in-H2O for 1.5 hrs at each vacuum (a total of 4.5 hrs). Maximum vacuum and corresponding flow data for each TSSV-1 screened interval were evaluated after step testing by closing valving on the manifold and extracting vapor from each well individually. Following completion of TSSV-1 step testing, an Maricopa County Cave Creek Landfill Phoenix, AZ November 19, 2012 Page 21 Additional Site Characterization Work Plan initial maximum vacuum test was performed with PW. SVE from PW achieved a maximum vacuum of 26 in-H2O. Step testing conducted with PW evaluated vacuums of 8.6, 17, and 26 inH2O for 1 hr, 0.5 hrs and 1 hr, respectively. During testing, field parameter monitoring was conducted at 30-min intervals and included: − Applied vacuum in the test well(s) and induced vacuum in surrounding shallow soil vapor monitoring wells (as measured by Magnehelic gauges); − The flow rate of extracted vapor (as measured using a pitot tube/Magnehelic gauge system integral to the trailer-mounted blower assembly); − VOC concentrations in extracted vapor (as measured using a handheld PID calibrated with isobutylene); and − Oxygen concentrations in extracted vapor (as measured using a four gas multimeter). Table 5 summarizes operational data collected during testing and Appendix J presents collected field parameter data. Samples of the extracted vapor from each of the extraction points were collected in laboratorysupplied 1-L Summa canisters at the beginning of the first step test and just prior to the end of each corresponding step test (a total of 20 samples). An ambient blank vapor sample was also collected. The vapor samples were submitted via the Columbia Analytical Services (CAS) Phoenix, AZ laboratory to their Simi Valley, California laboratory (ADHS License No. AZ0694) for analysis of VOCs using EPA Method TO-15. Table 6 summarizes the results of laboratory sample analysis. Appendix G, H and I present collected soil vapor data more comprehensively and Disk 1 (Soil Vapor Sampling) presents the full laboratory analytical report. Following completion of testing activities, a sample of the V-GAC was collected for waste profiling purposes. AMEC submitted the sample to Test America in Phoenix, Arizona (ADHS License No. AZ0728) for Toxicity Characteristic Leaching Procedure (TCLP) VOCs by EPA Method 1311/8260B. No VOCs were detected in the extracted leachate from the V-GAC sample at concentrations exceeding laboratory reporting limits; Disk 1 (Soil Vapor Sampling) presents the full laboratory analytical report. 2.3.1.2 Test Results Notable results of the One-Day Preliminary SVE Test are as follows: − Maximum achieved vacuums with corresponding flow rates in TSSV-1-S, TSSV-1-M, and TSSV-1-D were 156 actual cubic ft per minute (acfm) at 42 in-H2O, 62 acfm at 56 in-H2O, and 55 acfm at 56 in-H2O, respectively. When the TSSV-1 wells were manifolded together, flow rates for the same applied vacuum indicated preferential flow to the shallow well. Given the similar construction of these wells and negligible losses due to friction over the 150 to 350-ft pipe runs between screened intervals on a relative basis, these results suggest an increase in compaction of the alluvial vadose zone formation with depth. Maricopa County Cave Creek Landfill Phoenix, AZ November 19, 2012 Page 22 Additional Site Characterization Work Plan − Vacuum readings conducted at shallow vapor monitoring wells surrounding the SVE test well(s) ranged from less than 0 (i.e., pressure) to 0.07 in-H2O measured as vacuum (at ODP-3 during extraction from TSSV-1). Since this reading is negligible and was observed during testing at the lowest vacuum without a corresponding increase in induced vacuum with increasing applied vacuum, this reading is not indicative of lateral influence. Vacuum readings conducted at PW during maximum vacuum extraction at TSSV-1 ranged from 0.5 to 0.6 in-H2O measured as vacuum; these readings are also very small in magnitude but may indicate a slight pneumatic connection between TSSV-1 and PW. These wells are located about 325 lateral ft away from each other but PW is screened approximately 80 ft deeper. Readings obtained at the TSSV-1 wells during extraction from PW do not readily corroborate this conclusion. In general, it appears that the screened intervals of surrounding test wells were not appropriately located to effectively evaluate radius of influence (ROI) during the One Day Preliminary SVE Test. − The primary VOCs present at all evaluated deep soil vapor intervals were TCE (at 32 to 310 mg/m3), trichlorotrifluoroethane or Freon-113 (at 2.9 to 140 mg/m3), 1,1-DCE (at 0.29 to 37 mg/m3), and PCE (at 1.2 to 30 mg/m3). The maximum concentration of each of these compounds was greatest at TSSV-1-D except for Freon-113 which was observed at the greatest concentration at TSSV-1-S. Other VOCs present predominantly at depth included methylene chloride, 1,2-dichlorobenzene (1,2-DCB), 1,1-dichloroethane (1,1-DCA) and the reductive dechlorination byproducts of TCE biodegradation: cis-1,2-DCE and vinyl chloride. − Tetrahydrofuran (THF) and methyl ethyl ketone (MEK) were both observed in initial samples collected during TSSV-1 step testing but concentrations decreased to non-reportable concentrations with continued soil vapor extraction. Most VOC concentrations increased over the course of testing. Both THF and MEK are less volatile than the other reported VOCs; the presence of these compounds during initial extraction and then absence of these compounds over significant duration of extraction may suggest a phase-based mass transfer limitation at the intervals tested (i.e. THF and MEK contamination may also be present in a phase other than vapor). 2.3.2 Extended SVE Pilot Test 2.3.2.1 Test Preparation and Process Equipment Description Extended SVE Pilot Test preparation activities included air permitting of planned operations, site infrastructure improvements, and process equipment installation. On the basis of One Day Preliminary SVE Pilot Testing, AMEC designed a vapor treatment system for the Extended SVE Pilot Test that included both V-GAC and Hydrosil (potassium permanganate impregnated media) for control of extracted VOCs. SVE and the associated vapor treatment system were permitted in accordance with MCAQD rules and regulations. The permit number is 980398. Since the anticipated duration of the test was three months, a chain-link fenced treatment compound was constructed at the TSSV-1 wellhead, in the northeast corner of the transfer station area. Single phase 240 volt (V) electrical service was supplied by installing below grade 2-in diameter Sch 80 electrical conduit between the transfer station building and the treatment compound. A phase converter was used to supply three phase service to the process blower. A Maricopa County Cave Creek Landfill Phoenix, AZ November 19, 2012 Page 23 Additional Site Characterization Work Plan new process piping run (approximately 400 ft in total length) connecting PW with the treatment compound was also installed; the run consists of both above grade 4-in diameter Sch 40 PVC pipe (from the wellhead to the transfer station building) and below grade 4-in diameter Sch 80 PVC pipe (from the transfer station building to the treatment compound). Above grade piping was sloped back toward PW; below grade piping was sloped toward a below grade sump located at the treatment compound. Within the treatment compound, an above grade process air manifold connecting PW with the 2in diameter TSSV-1-S, TSSV-1-M, and TSSV-1-D wells was constructed of 4-in diameter Sch 40 PVC pipe with appropriate valving to isolate flow from each well. The manifold was plumbed to a condensate knockout tank equipped with a manual dilution air valve and liquid level floats to control operation of a condensate water transfer pump connecting the knockout tank to an adjacent 2,000-gal condensate storage tank. A 4-in diameter Sch 40 piping run located downstream of the knockout tank (installed for flow measurement) was connected with 4-in diameter hoses to two V-GAC vessels (each filled with 2,000 lbs of carbon) configured in series followed by one vessel filled with 1,500 lbs of Hydrosil (HS-600). A 25-horsepower (HP) Sutorbuilt Model No. 6HP process blower rated to supply 500 scfm was connected downstream of the Hydrosil vessel with a 4-in diameter hose (i.e., the carbon and Hydrosil vessels operated under vacuum). The blower discharged through a silencer to atmosphere. Process control valving included the manual dilution valve on the knockout tank noted above to introduce ambient air into the process flow and a recirculation valve on piping in parallel with the process blower to reduce process flow while maintaining maximum system vacuum. The system air permit required that the influent VOC concentration to the treatment system be 200 ppmV or less; the manual dilution valve was used to introduce ambient air to the influent process flow when VOC concentrations, as measured using a PID, exceeded this value. Samples collected from wellheads were not diluted since the dilution air was introduced under vacuum at the knockout tank, downstream of the individual wellheads. Dedicated instrumentation on the system included vacuum gauges located at each wellhead, immediately before the knockout tank, and immediately before the process blower. A temperature gauge and pitot tube/Magnahelic gauge flow measurement system were located on process blower discharge piping. Sample ports were located at each wellhead, between the knockout tank and carbon/Hydrosil vessels (i.e., the treatment system influent), between each of the treatment system vessels, and after the Hydrosil vessel (i.e., the treatment system effluent). 2.3.2.2 Description of Test Operations Startup of the Extended SVE Pilot test began on November 16, 2011 and included the following test wells and durations of extraction: − From November 16, 2011 through November 28, 2011 extraction occurred concurrently from PW and TSSV-1-S (282 hrs); − From December 5, 2011 through December 15, 2011 extraction occurred from TSSV-1-S (245 hrs); Maricopa County Cave Creek Landfill Phoenix, AZ November 19, 2012 Page 24 Additional Site Characterization Work Plan − From January 16, 2012 through February 20, 2012 extraction occurred from TSSV-1-M (818 hrs); and − From February 20, 2012 through February 29, 2012 extraction occurred from TSSV-1-D (214 hrs). The total duration of the test was 1,559 hrs (approximately 65 days). Periods of suspended operation during the test were primarily for carbon change out activities (V-GAC run times were variable due to the different intervals tested). Although restarted on December 5, 2011 after a carbon changeout, extraction from PW was suspended after monitoring due the receipt of quarterly groundwater monitoring results indicating elevated concentrations of TCE, cis-1,2DCE, 1,1-DCE, PCE, and vinyl chloride in groundwater sampled from PW (see Appendix E for the analytical results for the sample collected from PW on November 22, 2011). A follow up sample collected from PW in December 2011 indicated a return to pretest VOC concentrations in groundwater extracted from PW. During the test, AMEC conducted field monitoring including: − Applied vacuum in the test well(s) and at various locations within the process flow (as measured by Magnehelic gauges); − Induced vacuum in surrounding shallow soil vapor monitoring wells (as measured by Magnehelic gauges); − Individual wellhead and influent flow rates (as measured using a TSI VelociCalc anemometer inserted into associated process piping) - an influent flow monitoring pipe of sufficient length was not installed until December 6, 2011; − SVE blower discharge flow rate (as measured using a dedicated pitot tube/Magnehelic gauge system); − SVE blower discharge temperature (as measured using a dedicated temperature gauge); − SVE blower/treatment system hours (as measured using a dedicated hour meter); − SVE blower and phase converter amperage (as measured using dedicated amp meters); − VOC concentrations in extracted vapor at individual wellheads, the vapor treatment system influent, downstream of the lead carbon vessel, downstream of the lag carbon vessel, and the vapor treatment system effluent (as measured using a handheld PID equipped with a 10.6 electron volt [eV] lamp calibrated with isobutylene); − Carbon monoxide, methane, hydrogen sulfide, and oxygen concentrations in extracted vapor at individual wellheads and the treatment system influent (as measured using a four gas meter); − The settings of all process control valves; and Maricopa County Cave Creek Landfill Phoenix, AZ November 19, 2012 Page 25 Additional Site Characterization Work Plan − The volume of condensate in the knockout tank and the condensate storage tank. Table 5 summarizes operational data collected during testing and Appendix K presents collected field parameter data. Vapor samples collected from the individual wellheads and from various points in the process stream were collected in laboratory-supplied 1-L Summa canisters and submitted under chain of custody to AEL in Phoenix, Arizona (ADHS License No. AZ0740). The samples were analyzed using EPA Method TO-15 for VOCs. Table 6 summarizes wellhead sample VOC analysis results and Table 7 summarizes the VOC analysis results of vapor treatment performance samples. Appendix G, H and I include a more comprehensive presentation of collected soil vapor data while Disk 1 (Soil Vapor Sampling) presents full analytical laboratory reports. Carbon changeout activities were performed as necessary based on the results of PID monitoring and vapor sampling for laboratory analysis at various locations within the vapor treatment system process flow. The air permit defined breakthrough as less than a 90% VOC treatment efficiency. Carbon changeouts occurred on the following dates: − December 1, 2011 (lead and lag vessels) – run time was 281 hrs (11.7 days); and − January 20, 2012 (lead and lag vessels) – run time was 318 hrs (13 days). On January 20, 2012, a third carbon vessel was delivered to the site to reduce the frequency of carbon changeout mobilizations. This vessel was intended to be rotated into service after breakthrough in the lead carbon vessel; however, it initially operated in series after the lead and lag vessels from January 20, 2012 through January 27, 2012. This vessel was placed in service as a lag vessel after removing the lead vessel and moving the lag vessel into the lead position on February 20, 2012. Based on the total volume of V-GAC used during the Extended SVE Pilot Test (14,000 lbs) and the total duration of SVE with V-GAC treatment (1559 hrs or 65 days), the carbon usage rate was approximately 215 lbs per day. During the first carbon changeout on December 1, 2011, a composite sample of the V-GAC removed from the lead and lag vessels was collected for waste profiling purposes. AMEC submitted the sample to Test America in Phoenix, Arizona (ADHS License No. AZ0728) for TCLP VOCs by EPA Method 1311/8260B. TCE was detected in extracted leachate from the VGAC sample at a concentration of 0.62 mg/L which exceeds the toxicity characteristic limit for TCE of 0.5 mg/L (the full analytical laboratory report is presented on Disk 1 with Soil Vapor Sampling data). On this basis, all carbon removed from treatment operations during the Extended SVE Pilot Test was profiled as hazardous waste and transported from the site under hazardous waste manifest to the US Ecology Beatty, Nevada facility for further processing in accordance with their Treatment, Storage, and Disposal (TSD) facility permit. Maricopa County Cave Creek Landfill Phoenix, AZ November 19, 2012 Page 26 Additional Site Characterization Work Plan 2.3.2.3 Test Results Notable results of the Extended SVE Pilot Test are as follows: − At approximately twice the applied vacuum achieved during the One Day Preliminary Pilot Test (100 in-H2O), flows extracted from test wells increased to maximums of 242 scfm in TSSV-1-S, 96.7 scfm in TSSV-1-M, 60.5 scfm in TSSV-1-D, and 230 scfm in PW (see Table 5). These increases in flow were relatively small and suggest that additional increases in vacuum will not significantly increase flow extracted from these wells (see vacuum-flow plots presented in Appendix K; One Day test flow data are reported in acfm while Extended SVE test flow data are reported in scfm). As demonstrated by the magnitude of flow extracted from PW (from which extracted flows were greater than TSSV-1-D even though PW is screened deeper) well construction (i.e., well casing diameter, slot size, and annular material selection) considerably impacts the quantity of flow extracted from vapor wells. − Observed VOC concentrations were significantly greater in the Extended SVE Pilot Test than in the One Day Preliminary Pilot Test (see Table 5). While all concentrations increased, this disparity was most notable at depth. At TSSV-1-D, TCE concentrations were higher than at any vapor monitoring location sampled at the site to date (2,600 mg/m3) and an order of magnitude greater than the highest TCE concentration observed at this well during the One Day Preliminary Pilot Test (310 mg/m3). The increase may be attributable to a corresponding increase in concentrations since the previous test was conducted but could also be associated with the increased duration and rate of extraction used during the Extended SVE Pilot Test. These factors can affect how representative extracted concentrations are of the formation in the immediate vicinity of the well screen and/or within the ROI of the well. It is possible that when wells are completed at deeper intervals, impacts on concentrations due to the duration and rate of extraction are more pronounced. The VOC concentrations in grab samples collected on November 8, 2011 provide evidence that representativeness may be an issue during short-term sampling of deep soil vapor wells. As shown in Table 6, VOC concentrations in samples collected on November 8, 2011 from TSSV-1-D (after three well volumes were purged) were generally lower than in samples collected during the continuous extraction conditions of either the One Day Preliminary Pilot Test or the Extended SVE Pilot Test. In the shallower wells (TSSV-1-S and TSSV-1-M), VOC concentrations in grab samples collected on November 8, 2011 were relatively more consistent with those observed during the One Day Preliminary Pilot Test. − Concentrations of VOCs in extracted vapors from each interval increased with the duration of extraction (see Table 6 and the TCE concentration-extraction duration and TCE concentration–extraction volume plots in Appendix K). TCE concentrations observed at TSSV-1-S increased from 460 to 910 mg/m3 and appeared to stabilize after approximately 200 hrs (8 days) of extraction (approximately 2.4 million cubic ft of soil vapor extracted). At TSSV-1-M, concentrations increased from 446 to 753 mg/m3 and appeared to stabilize after approximately 350 hrs (14 days) of extraction (approximately 2.0 million cubic ft of soil vapor extracted). TCE concentrations at TSSV-1-D increased from 1,300 to 2,600 mg/m3 and did not stabilize over the 214 hours (8 days) this well was tested (approximately 0.72 million cubic ft of soil vapor extracted). The differing durations prior to stabilization are likely an Maricopa County Cave Creek Landfill Phoenix, AZ November 19, 2012 Page 27 Additional Site Characterization Work Plan effect of the varying extraction rates (and resulting volumes extracted) at each well. However, stabilization may also be impacted by non-homogeneity of VOC concentrations in the subsurface. With continuous extraction, mobilization of vapors from farther regions surrounding the extraction well can occur. If higher or lower concentrations are located some distance from the well but within the ROI of extraction, wellhead concentrations may change in response to the migration of these concentrations towards the extraction well. − Induced vacuum measurements at select wells located in the vicinity of test wells were conducted to assess lateral ROI during extended SVE. The results of monitoring are presented in Appendix K. Measurements ranged from 0.25 in-H2O measured as pressure at NDP-1D to 2 in-H2O measured as vacuum at ODP-3D. The 2 in-H2O reading is likely not indicative of influence because all other readings conducted from this well on November 16, 2011 through November 23, 2011 (during continuous extraction from TSSV-1-S) were negligible. The reading may be anomalous or the result of diurnal pressure-vacuum fluctuations in soils. Vacuum readings conducted at PW on February 20 and 29, 2012 while extraction occurred from TSSV-1-M and TSSV-1-D ranged from 1.2 to 1.5 in-H2O measured as vacuum. The magnitude of these readings is insufficient to demonstrate a pneumatic connection between the wells. As observed during the One Day Preliminary SVE Pilot Test, it appears that the screened intervals of surrounding test wells were not appropriately located to effectively evaluate ROI during the Extended SVE Pilot Test. − Vacuum was measured during extraction from TSSV-1-M and TSSV-1-D at non-extraction TSSV-1 wells on February 7, 20, and 29, 2012 to assess vertical influence. Readings ranged from 0.08 in-H2O to greater than 2 in-H2O measured as vacuum; however no consistent pattern of influence was discernable. These data are inconclusive. − In the absence of adequate observation well data (which are typically used to calculate air permeability from field data), estimates of air permeabilities were inferred using plots of vacuum versus applied flow obtained during testing (see Appendix K) and the results of equations describing the theoretical relationship between flow and applied vacuum for a range of reasonable values for ROI (pursuant to Johnson et al., 1990). Results are summarized as follows: Assumed ROI 30 100 200 Corresponding Soil Type Estimated Permeability at TSSV-1-S Estimated Permeability at TSSV-1-M Estimated Permeability at TSSV-1-D 4E‐8 to 1E‐7 cm2 5E‐8 to 1E‐7 cm2 5E‐8 to 2E‐7 cm2 Fine to Medium Sand 2E‐8 to 3E‐8 cm2 2E‐8 to 4E‐8 cm2 3E‐8 to 5E‐8 cm2 Fine Sand 1E‐8 to 2E‐8 cm2 1E‐8 to 3E‐8 cm2 2E‐8 to 3E‐8 cm2 Fine Sand As indicated by this analysis, estimated permeabilities decreased with depth. These estimated permeabilities generally correspond to the permeability of fine sand (1E-8 cm2 to 1E-7 cm2 or approximately 1 to 10 darcys). − Based on average extraction rates and VOC concentrations, the quantity of TCE, 1,1-DCE, and PCE mass extracted during the Extended SVE pilot was substantial. As presented in Maricopa County Cave Creek Landfill Phoenix, AZ November 19, 2012 Page 28 Additional Site Characterization Work Plan Table 5, over 700 lbs of TCE were removed from the subsurface and mass extraction rates did not attenuate over the duration of testing. This suggests that a considerable quantity of mass is located in the deep soil vapor underlying the site. Although there is limited information regarding the extent of VOC-impacted vapor based on this test, the highest quantity of mass extracted and associated mass extraction rates were from TSSV-1-S and PW. The quantity of mass extracted from TSSV-1-D was lower because of the relatively low extraction rates achieved from this well. − As noted in the description of test operations, extraction from PW only occurred for 282 hrs in mid November 2012 because quarterly groundwater sampling indicated the presence of significantly elevated concentrations of VOCs in the groundwater while the well was undergoing SVE. It is possible that the abrupt increase was unrelated to extraction activities. However, if SVE in the well screen above the water table at PW did result in increased groundwater VOC concentrations, it may be attributable to either localized upwelling of the water table into a VOC-impacted region of the vadose zone or the discharge of VOCimpacted condensate into the well from SVE operations (SVE piping is sloped back to the well). Based on the results of resampling in December 2012, the effect was limited in extent and transient. − The elevated VOC concentrations observed during the Extended SVE Pilot Test significantly increased the frequency of required carbon changeouts relative to planned carbon usage rates. The calculated carbon usage rate derived from the One Day Preliminary SVE Pilot Test was 29.5 lbs per day and was based on a volumetric air flow rate of 720,000 cubic ft per day (500 cfm). The average carbon usage rate observed over the duration of the Extended SVE Pilot Test was 215 lbs per day and the average volume of air treated was 240,000 cubic ft per day (167 cfm). Table 7 presents Design Influent Concentrations based on One Day Preliminary SVE Pilot Test data with the results of influent sample data from the Extended SVE Pilot Test for comparison. It is interesting to note that some compounds observed at significant concentrations during the One Day Preliminary SVE Pilot Test were not routinely observed at reportable concentrations during the Extended SVE Pilot Test (e.g., chloroform, MEK, and THF). − As shown in Table 7, the V-GAC treatment system effectively removed VOCs from extracted soil vapors during the Extended SVE Pilot Test, despite the elevated concentrations of VOCs observed. Calculated total VOC treatment efficiencies ranged from 94.9% to 99.8% which exceeded the air permit requirement of 90%. Use of Hydrosil in the third treatment vessel after lead and lag carbon vessels effectively controlled vinyl chloride vapors throughout the duration of the test. Effluent vinyl chloride concentrations ranged from less than 0.010 to 1.3 ppmV. For the only sampling date on which vinyl chloride was detected in the influent process stream (February 29, 2012), the calculated treatment system efficiency for vinyl chloride was 94.3%. − PID measurements were conducted to evaluate influent VOC concentrations in the field and breakthrough in V-GAC treatment vessels (in accordance with the requirements of the air permit). Table 7 presents the PID field screening data with the results of corresponding sample analyses. In general, PID field screening was effective in estimating VOC Maricopa County Cave Creek Landfill Phoenix, AZ November 19, 2012 Page 29 Additional Site Characterization Work Plan concentrations. However, during extraction from TSSV-1-D, PID monitoring greatly underestimated the total quantity of VOCs in the influent stream (see influent data corresponding to the February 29, 2012 sample date). This low bias in select PID data may be associated with elevated concentrations of methylene chloride, vinyl chloride, methane and/or carbon monoxide in extracted vapors from TSSV-1-D. The elevated methylene chloride concentration could have contributed to the disparity in results since the ionization energy for this compound (11.32 eV) is higher than the rating on the PID lamp used during field monitoring (10.6 eV). The elevated vinyl chloride concentration could have impacted result agreement because the published correction factor for vinyl chloride is 2.0 for a 10.6 eV lamp (i.e., for a PID evaluating vinyl chloride but calibrated with isobutylene, the result is multiplied by 2.0 to estimate the corresponding concentration of vinyl chloride; Rae Systems, Inc., 2010). The methane and carbon monoxide present in the influent process flow (which were measured in the field at concentrations of up to 2.3% and 13% by volume, respectively) could have contributed to a lower PID reading by scattering and absorbing the ultraviolet rays used in the PID to ionize the gas being analyzed (a phenomenon known as ‘quenching’; Chou, 1999). Thus, the composition of the soil vapor extracted from TSSV-1-D appears to have adversely impacted agreement between field and laboratory analytical data which was not apparent until after laboratory data were received. − Maximum concentrations of cis-1,2-DCE and vinyl chloride at TSSV-1-D were 1,400 mg/m3 and 59 mg/m3, respectively. These concentrations are significant and together with the elevated methane concentrations (suggesting highly reduced conditions) that were also detected at TSSV-1-D (2.3% by volume) are indicative of microbially mediated reductive dechlorination of TCE. Reductive dechlorination is an electron transport process that occurs under anaerobic conditions and results in the production of successively less chlorinated daughter products from highly chlorinated compounds such as PCE and TCE (i.e., PCE transforms into TCE, TCE transforms into cis-1,2-DCE, cis-1,2-DCE produces vinyl chloride, and vinyl chloride becomes ethene). TCE and the daughter products serve as electron acceptors during the metabolism of an electron donor (carbon source) that the microorganism uses for growth. It is not clear whether the daughter products observed at depth were produced at depth or only within the landfills (cis-1,2-DCE has been detected in shallow soil vapor samples); however, for this process to occur, an electron donor would need to be present and appropriate environmental conditions for anaerobic microbial growth would be required (e.g., the absence of competing electron acceptors, adequate moisture, neutral pH, etc.). Within the landfill, electron donors resulting from the decay of waste would likely be present within the waste and/or in associated landfill leachate. In the arid soils found in Arizona alluvial deposits, electron donors would be less prevalent at depth unless landfill leachate was present. The detection of methane at depth suggests that reductive dechlorination could be occurring at depth (perhaps at the groundwater vadose zone interface) since this gas is less dense than air and would likely be less subject to densitydriven vertical migration to significant depth. Maricopa County Cave Creek Landfill Phoenix, AZ November 19, 2012 Page 30 Additional Site Characterization Work Plan 3.0 CURRENT CONCEPTUAL SITE MODEL This CSM is an evolving representation of the site environmental setting and associated processes controlling the transport, migration and potential impacts of contamination (in soil, soil vapor, and groundwater) to receptors near CCL. Development and refinement of the CSM will help identify investigative data gaps in the characterization process and can ultimately support remedial decision making. As an evolving model, the CSM will be modified as needed to continually evaluate the relationship between sources of contaminants, migration pathways, and receptors as new data become available. Although this CSM is intended to be comprehensive, the presented information is generally summarized from previous reports (i.e., the GCWP and Addendum). Where new information has been collected to update the CSM, a more significant level of detail is documented herein. 3.1 Environmental Setting The site lies within the Basin and Range Physiographic Province in Central Arizona. In this area, the mountains are generally comprised of crystalline rock separated by broad alluvial valleys. Mountains represent upthrown fault blocks from which sediments have been eroded and deposited in the basins below. In the centers of these basins, depth to bedrock can exceed 10,000 ft bgs. 3.1.1 Topography Site topography has been altered for the landfill and drainage areas; the highest cover elevation is approximately 1,910 ft. Topography at the site outside the cover/retention areas ranges from an elevation of approximately 1,842 ft AMSL to 1,881 ft AMSL. 3.1.2 Climate Climate in the Cave Creek area is semi-arid with hot summer and mild winters (Corkhill et al, 1993). Average temperatures range from 76 to 102 degrees Fahrenheit, with the coolest temperatures in December and warmest temperatures in July (Weather.com, 2012). Average annual precipitation ranges from 7 to 8 in, with greater amounts occurring at higher elevations. The majority of regional precipitation typically occurs during summer monsoons which consist of brief high intensity storms, typically creating significant overland flow (July through September). Less intense, longer precipitation events also occur during winter months (December through March) (Corkhill et al, 1993). The Phoenix area and much of the State of Arizona has been in a drought since 1996 (Rascona, 2004). Precipitation in the vicinity of CCL from late 2005 to 2012 is presented in Figure 5. 3.1.3 Land Use Section 1.1 presents information regarding land use at CCL and adjacent properties. In summary, the CCL property includes two closed landfill regions (referred to in this report as the Old Landfill and the New Landfill). Undeveloped desert which is planned for preservation Maricopa County Cave Creek Landfill Phoenix, AZ November 19, 2012 Page 31 Additional Site Characterization Work Plan borders CCL to the north, west and south. A private golf course and residential development borders CCL to the east. Residential structures are located within 100 ft of the eastern toe of the New Landfill. 3.1.4 Surface Water Hydrology Cave Creek is located approximately 400 ft northwest of the site (see Figure 1) and is the only significant natural surface water body located within a one-mile radius of the CCL. Cave Creek is generally dry and only flows in response to local rain events. U.S. Geological Survey (USGS) Station Number 09512280 monitors the rate of flow and elevation in Cave Creek; it is located approximately 7 miles north of the CCL property (AMEC, 2009). Streamflow in Cave Creek reported from Station Number 09512280 for late 2005 through 2012 is provided in Figure 5 (USGS, 2012). It should be noted that Cave Creek receives surface water flow from multiple braided washes that drain the region surrounding CCL following significant precipitation events. One of these natural washes is located directly south of the New Landfill on Arizona State Trust Land (see Figure 2). Four retention basins are present on the CCL property to retain all site runoff and site intercepted runon (see Figure 1). Prior to development of the site as a landfill, a natural wash conveyed surface flow through the region that is now the New Landfill (a remnant of this wash is identifiable to the west of the New Landfill in Figures 1 and 2). Development to the east of the landfill has significantly altered natural drainage channels and reduced the quantity of storm water runon to the CCL site. In addition to the site retention basins, multiple ponds (construction unknown) are present at the golf course located to the east of CCL. 3.1.5 Regional Hydrogeology CCL is located in the East Salt River Valley (ESRV) sub-basin of the Phoenix Active Management Area (AMA) established by the Arizona Department of Water Resources (ADWR). As discussed in BAS (2005), ESRV stratigraphy consists of a thick sequence of alluvial and lacustrine valley deposits. These units are identified by the ADWR (2006) as the Upper Alluvial Unit (UAU), the Middle Alluvial Unit (MAU), and the Lower Alluvial Unit (LAU). The UAU is comprised mainly of unconsolidated gravel, sand, and silt deposited in alluvial channel, terrace, and floodplain deposits (Corell and Corkhill, 1994). The MAU is comprised mainly of clay, silt, mudstone and gypsiferous mudstone with some interbedded sand and gravel. Near the margins of the alluvial basins, and in the area of CCL, the MAU consists mainly of sand and gravel and is reported as difficult or impossible to distinguish from other units (ADWR, 2006). The LAU is subdivided into two parts in the area of the CCL: The lower part is composed of evaporite deposits (gypsum and anhydrite) interbedded with sand, gravel, and basaltic rocks. The upper part is composed of semi-consolidated sand, gravel and silt. 3.1.5.1 Regional Groundwater Use Since the 1960s, groundwater in the CCL area has been developed as potable and non-potable water sources, with the largest increase in production starting in the mid to late 1980s. As Maricopa County Cave Creek Landfill Phoenix, AZ November 19, 2012 Page 32 Additional Site Characterization Work Plan indicated in the Addendum, the COP and City of Scottsdale (COS) have pumped municipal supply wells to supplement drinking water supplies approximately two miles east and southeast of the site. To supplement the analysis of regional groundwater extraction use for domestic/public water supply, a list of wells registered with ADWR since March 2009 (the listing presented in the Addendum) is provided in Table 8. The area of interest was limited to those wells located within a 3-mile radius of CCL. Figure 6 displays the location of both exempt and non-exempt registered wells within a 3-mile radius of the site (ADWR, 2012). A well is considered "exempt" if it has a maximum pump capacity of 35 gal per min; these wells are typically used to withdraw groundwater for domestic purposes, including watering less than two acres of grass or garden. Exempt wells must be registered with ADWR but are subject to fewer requirements than nonexempt wells which have a pump capacity greater than 35 gallons per minute. The following was noted in the update of the ADWR well registry for the area of interest: − In December 2009, COP Well 281 (ADWR Number 55-524599) reached the end of its useful life and was replaced by COP 9A-Well 300 (ADWR Number 55-218928) which is located approximately 1.5 miles east of the CCL. COP 9A-Well 300 is to serve as a dual purpose well that can recharge potable supplies through direct injection into the aquifer and pump/distribute stored supplies during peak demand to supplement water supplies in northeast Phoenix (i.e., the well is an Aquifer Storage and Recovery [ASR] well). The COP City Council awarded a contract for installing a pump/motor and constructing the infrastructure associated with the new well on April 18, 2012 (COP, 2011 and 2012). − Two new exempt domestic supply wells were identified approximately 2.5 miles southeast of CCL (ADWR Numbers 55-219460 and 55-912638). − Two Notice of Intent (NOI) applications were filed with ADWR for new exempt domestic supply wells located approximately 1 mile east and 2.5 miles south of CCL (ADWR Numbers 55-911959 and 55-220996, respectively). State-imaged records indicate ADWR issued letters to both applicants stating the proposed well locations were situated within the Phoenix AMA and according to Arizona Revised Statutes § 45-464(C) the wells cannot be drilled because they are located within 100 ft of an operating water supply and distribution system of a designated water provider. No additional records were immediately available regarding the status of these applications with ADWR. 3.1.5.2 Regional Groundwater Flow Prior to the development of COP and COS groundwater well fields (circa 1978) the predominant direction of groundwater flow in the vicinity of CCL was to the southwest (Littin, 1979). With the development of regional groundwater sources, the water table elevation has decreased significantly, more than 100 ft in COP wells since the 1980s. As a result of the increase in groundwater production, the predominant flow of groundwater has shifted to the southeast toward the regional pumping center. Annual Pumpage (1984 to 2010) from COP and COS wells located east to southeast of CCL is presented in Figure 7. The following is indicated from the reported annual pumpage: Maricopa County Cave Creek Landfill Phoenix, AZ November 19, 2012 Page 33 Additional Site Characterization Work Plan - The highest rates of annual groundwater withdrawal in the CCL region for public water supply were reported in 1999 at more than 5,000 acre-ft per year (AF/year) with more than 60 percent being groundwater production from COP wells. - Maximum individual pumpage was from COS Well 65 (55-518789) in 2002 at a rate of 2,333 AF/year. In 2010, only 241 AF/year was reported for the annual pumpage from this well. No pumpage records exist for this well prior to 1991. - The lowest rates of annual groundwater withdrawal in the CCL region for public water supply were reported in 1984 at approximately 250 AF/year. Groundwater wells in this region are intended to be used to supplement water supplies in northeast Phoenix during high demand periods. In an attempt to recover some aquifer storage, the COP has implemented a program to recharge potable supplies through direct injection into the aquifer. 3.1.6 Site Hydrogeology Subsurface geology beneath CCL is typical for the ESRV and for the Phoenix area. Geology has been interpolated in the area surrounding CCL due to the large amount of undeveloped land present in the region and the lack of deep lithologic interpretative data. According to ADWR (2006), the bottom elevation of the UAU ranges from approximately 1,600 to 1,500 ft AMSL, the bottom of the MAU ranges from approximately 1,200 to 1,000 ft AMSL, and the bottom of the LAU ranges from approximately 1000 to 800 ft AMSL at the site. As discussed above, in the area of CCL, the MAU is difficult to distinguish from other units; for this reason the local lithology is generalized and referred to as undifferentiated alluvial deposits. Three hydrostratigraphic profiles were generated to depict the significant depth of the vadose zone at the site and present the relative depths of site monitoring locations to both natural and constructed site features. The lines of cross section are identified on Figure 8. Generalized Hydrostratigraphic Cross Sections A-A' and B-B' are illustrated on Figure 9 and represent the subsurface from west to east at the Old Landfill and from north to south along the east side of the New Landfill. Figure 10 displays the Generalized Hydrostratigraphic Cross Section C-C' which depicts the subsurface from west to east at the southern portion of the New Landfill. 3.1.6.1 Vadose Zone Geology. Stratigraphic data collected during visual logging of cuttings and geophysical logging of site borings (prior to monitoring well installation) indicate the vadose zone consists of unconsolidated alluvial deposits (sands, gravels, cobbles, and boulders) with little to essentially no clay content. The deposition is highly heterogeneous but a relatively thin zone of increasing finer-grained materials (layered silts and fine sands) at depths of 200 to 250 ft bgs, or approximately 1,650 to 1,600 ft AMSL in elevation, is indicated in the southern portion of the site. In the northern portion of the site, a similar zone occurs at a shallower depth, approximately 110 ft bgs or about 1,780 ft AMSL. This slight change in grading may indicate the transition from the UAU to the MAU. Maricopa County Cave Creek Landfill Phoenix, AZ November 19, 2012 Page 34 Additional Site Characterization Work Plan Permeability. Based on the composition of the unconsolidated alluvial deposits, the formation is likely characterized by high permeabilities. The results of soil vapor extraction testing (of screened intervals ranging from 150 to 600 ft bgs) suggest that the air permeability of deep sediments is on the order of 1E-8 cm2 to 1E-7 cm2 (1 to 10 darcys). Depth to Groundwater. The groundwater elevation at the CCL ranges from approximately 1,158 to 1,206 ft AMSL (see Table 3). Based on ADWR (2006) estimates, the entire UAU and a significant portion of the MAU is unsaturated at CCL. In the vicinity of CCL, the vadose zone is approximately 650 to 700 ft thick based on water levels collected at site monitoring wells between 2001 and 2012. 3.1.6.2 Saturated Zone Aquifer Hydraulic Properties. The ability of the aquifer to transmit water at CCL is estimated based on materials encountered during drilling and regionally documented information. The saturated zone, at depth, consists of fine to very coarse grained unconsolidated sediments deposited in an alluvial environment. This depositional environment yields a highly heterogeneous aquifer making it difficult to fully define transport properties. Based on values reported in the literature, the aquifer hydraulic conductivity may range from 1 to 200 ft per day (ft/day) and the specific yield ranges from 7 to 12 percent (Freihoefer et al 2009). Inflow. The primary source of recharge in the basin occurs from the infiltration of precipitation runoff from the surrounding mountains, the infiltration of urban stormwater runoff, and underflow from adjacent basins of higher altitudes. In addition, the COP has implemented an ASR program to artificially recharge groundwater through aquifer injection of surplus potable water. Outflow. Prior to groundwater development in the early 1960s, the aquifer system was considered to be at equilibrium. However, as discussed in Section 3.1.5, aquifer outflows have increased substantially since the 1960s, causing a deficit in the hydrologic budget and contributing to significant declines in groundwater elevations at the site over time. In addition to groundwater withdrawals, outflow from the aquifer also occurs as potential evapotranspiration (PET). PET is variable in the Salt River Valley; depending on the density of riparian corridors and phreatophyte growth, estimates of PET decreased from 48,000 AF/year to 25,000 AF/year between 1983 and 2006 due to loss of riparian habitat and declines in the regional water table (Corkhill et al. 1993 and Freihoefer et al 2009). 3.2 Nature and Extent of Contamination 3.2.1 Distribution of Impacts The results of soil vapor and groundwater sampling at the site indicate that both are impacted with VOCs that likely originated from one or both of the landfills. The following sections summarize the distribution of VOC contamination in soil vapor and groundwater, respectively. Maricopa County Cave Creek Landfill Phoenix, AZ November 19, 2012 Page 35 Additional Site Characterization Work Plan 3.2.1.1 Soil Vapor Soil vapor concentrations of VOCs vary with location and depth at the site. There is a fair amount of data collected from 2004 to date at shallow vapor monitoring wells. However, the current ability to assess the extent of impacted soil vapor at depth is limited by the location and construction of available monitoring wells used to collect soil vapor samples from below 150 ft bgs. Shallow Soil Vapor. Soil vapor samples have been collected from within the New Landfill, below both of the landfills, and at perimeter monitoring wells located throughout the site (see Figure 2 for well locations). A summary of shallow soil vapor data is as follows: Location Below the Old Landfill* Within the New Landfill Below the New Landfill* P Wells Depth (ft bgs) Maximum [TCE] Maximum [1,1-DCE] Maximum [cis-1,2-DCE] Maximum [PCE] Maximum [Freon-113] Maximum [Toluene] 80 to 140 21 mg/m3 (ODP‐01‐D) 380 mg/m3 (ODP‐01‐D) 0.72 mg/m3 (ODP‐02‐D) 14 mg/m3 (ODP‐01‐D) 120 mg/m3 (ODP‐01‐D) 12 to 77 1.9 mg/m3 (GW‐13) 0.52 mg/m3 (GW‐08) 25 mg/m3 (GW‐08) 2.2 mg/m3 (GW‐13) 0.24 mg/m3 (GW‐08) 0.12 mg/m3 (ODP‐02‐S/ ODP‐02‐D) 46 mg/m3 (GW‐013) 80 to 140 95 mg/m3 (NDP‐01‐D) 3.4 mg/m3 (NDP‐01‐D) 3.5 mg/m3 (NDP‐01‐S) 9.6 mg/m3 (NDP‐01‐D) 170 mg/m3 (NDP‐02‐D) 7.7 mg/m3 (NDP‐01‐D) 59 mg/m3 1.3 mg/m3 0.66 mg/m3 1.8 mg/m3 15.3 mg/m3 0.60 mg/m3 (P‐09) (P‐09) (P‐09) (P‐05) (P‐09) (P‐09) *Note: The base of the Old Landfill is located at approximately 17 to 22 ft bgs. The base of the New Landfill is located at approximately 38 to 80 ft bgs. 20 to 55 Appendix G, H and I present individual sample results by location and date sampled. VOC soil vapor data associated with shallow soils indicate: − Chlorinated VOC concentrations generally increase with depth. The highest concentrations of chlorinated VOCs (except cis-1,2-DCE) were observed in the deeper intervals of wells completed below the landfills. Concentrations within the New Landfill were lower. This trend of increasing concentrations with depth is also observed in the region surrounding the landfill (as monitored by the P wells); the highest concentrations of chlorinated VOCs (except cis-1,2-DCE) were indicated in P-09, which is completed at 51 ft bgs. VOC concentrations at P-8 and P-10, which are completed at 20 ft bgs and located approximately 300 ft south and north of P-09 respectively, were comparatively negligible. − The highest concentrations of chlorinated VOCs appear to be located in the vicinity of the Old Landfill or the northern portion of the New Landfill. This observation is particularly apparent in P well data collected from P-09 and P-22. P wells are located in the vicinity of the landfills but not directly within or below the landfills and can monitor the lateral migration of soil vapors from landfills. Soil vapor samples collected from P-09 and P-22 (which are both completed to approximately 50 ft bgs and located at or near the transfer station) contained the highest concentrations of TCE of all the P wells monitored. Maricopa County Cave Creek Landfill Phoenix, AZ November 19, 2012 Page 36 Additional Site Characterization Work Plan − There appear to be different chemical profiles of VOCs associated with each of the site landfills. The predominant chlorinated VOC in samples collected from all but one of the Old Landfill monitoring well locations (i.e., ODP-03) is 1,1-DCE. However, PCE and more recently TCE are more significant at ODP-03 (located in the southwestern portion of the Old Landfill). Concentrations of TCE and/or associated reductive dechlorination byproducts (e.g., cis-1,2-DCE) are the predominant chlorinated VOCs in samples collected from within or under the New Landfill. − There are other VOCs and semi-volatile organic compounds (SVOCs) present in shallow soil vapor samples collected from the site. Numerous Freons, petroleum hydrocarbons, and common solvents (e.g., acetone and MEK) are present. Freon-113 and toluene have been detected at the greatest concentrations and with the most prevalence. Toluene concentrations are highest within the New Landfill. These results suggest that contaminant-impacted soil vapors originating in the landfills dispersed both laterally and vertically at some time in the past and that currently, the highest soil vapor concentrations in shallow soils are present in the northern portion of the site. Deep Soil Vapor. Deep soil vapor has been evaluated in the Transfer Station area (between the two landfills at TSSV-1 and PW) and at the southern edge of the site (south of the New Landfill in MW-2). A summary of deep soil vapor data is as follows: Location Depth (ft bgs) Maximum [TCE] Maximum [1,1-DCE] Maximum [cis-1,2-DCE] Maximum [PCE] Maximum [Freon-113] Maximum [Toluene] 150 to 913 mg/m3 At TSSV‐1‐S, 8.34 mg/m3 0.170 mg/m3 27.1 mg/m3 421 mg/m3 <7.54 200 in the deep mg/m3 vadose zone 350 to 752 mg/m3 At TSSV‐1‐M, 5.56 mg/m3 47.5 mg/m3 36.6 mg/m3 199 mg/m3 <7.54 400 in the deep mg/m3 vadose zone 549 to 2,620 mg/m3 At TSSV‐1‐D, 262 mg/m3 1,230 mg/m3 237 mg/m3 245 mg/m3 0.730 559 in the deep mg/m3 vadose zone varies 752 mg/m3 At PW, 24.2 mg/m3 <1,890 285 mg/m3 37.3 mg/m3 107 mg/m3 directly mg/m3 above the water table 693 to 0.11 <0.005 0.0057 <0.0086 0.053 0.050 At MW‐2, 3 3 3 3 3 708* mg/m mg/m mg/m mg/m mg/m mg/m3 directly above the water table * Note: Monitoring depths are approximate; samples were collected below a packer system installed within the screened interval of a groundwater monitoring well. Appendix G, H and I present individual sample results by location and date sampled. VOC soil vapor data collected from deep soils indicate: Maricopa County Cave Creek Landfill Phoenix, AZ November 19, 2012 Page 37 Additional Site Characterization Work Plan − There are significant concentrations of chlorinated VOCs in the deep vadose zone and concentrations generally appear to increase with depth. Based on available data, the highest concentrations of VOCs observed to date (in either the shallow or deep vadose zone) are present between 549 and 559 ft bgs at TSSV-1D. Concentrations detected above the water table at PW (around 700 ft bgs) are lower but comparably elevated. − The VOC detected at the greatest concentration in soil vapor is TCE. The VOC with the next highest concentration is cis-1,2-DCE which is a reductive dehalogenation daughter product of TCE. 1,1-DCE is present in soil vapor at depth but the highest concentration of this compound detected at the site was in shallow soil vapor, under the Old Landfill (at ODP-01D). − Deep vadose zone soil vapor concentrations appear higher in the northern portion of the site (near TSSV-1 and PW) than in the southern portion of the site (at MW-2). Although MW-2 is not a soil vapor monitoring well, concentrations obtained by sampling vapors under a packer system installed in the screened interval of this groundwater monitoring well were comparatively negligible. Deep soil vapor data suggest that contamination from the landfills has migrated vertically and laterally resulting in a dispersed plume at depth that principally contains TCE and associated reductive dehalogenation daughter products; 1,1-DCE, PCE, and Freon-113 are also present at elevated concentrations. Despite the limited amount of data collected in the southern portion of the New Landfill, deep soil vapor results indicate that the northern portion of the site (near the Old Landfill and in the northern portion of the New Landfill) is more impacted with contaminated soil vapor than the southern portion of the site. 3.2.1.2 Groundwater Although other VOCs are present in groundwater underlying the site, TCE is the primary COC impacting groundwater quality at CCL based on the magnitude of concentrations present and the relatively low AWQS for this compound (5 μg/L). Appendix E and F summarize the results of analytes detected at reportable concentrations in site groundwater. Lateral Distribution of Contamination. TCE concentrations and groundwater elevations at wells with the longest period of record (i.e. PW, MW-1, MW-2, MW-3, and MW-4) are shown on Figure 11. As presented, reportable concentrations of TCE in groundwater are quite variable but have generally increased with the falling regional water table. The clearest association between TCE concentrations and groundwater levels is apparent at PW (which is located hydraulically upgradient of the New Landfill) and at MW-1 and MW-2 (which are located hydraulically downgradient of portions of both landfills). At PW, TCE concentrations have been detected at low levels since 1985 but began increasing in 1997 and reached a maximum of approximately 150 μg/L in 2008 (excluding data collected during the Extended Soil Vapor Extraction Test). TCE concentrations began increasing at MW-1 in 2005 and at MW-2 in 2007. The highest concentrations of TCE in groundwater observed at the site to date (without consideration of concentrations at PW during the Extended Soil Vapor Extraction Test) were at MW-2 which peaked in April 2010 (at 450 μg/L) and declined thereafter. Given deep soil vapor data that indicates TCE concentrations are higher in the northern portion of the site than at MW-2, this Maricopa County Cave Creek Landfill Phoenix, AZ November 19, 2012 Page 38 Additional Site Characterization Work Plan distribution of TCE in groundwater over the most recent 15-year period (from 1997 to 2012) suggests that interaction between contaminated soil vapor at depth with groundwater in a region north of MW-1 and MW-2 resulted in observed groundwater contamination in the past and migrated with groundwater flow to MW-2 The relative contribution of the Old Landfill and the New Landfill to groundwater impacts observed at MW-2 is less clear. Evidence that the Old Landfill contributes the bulk of VOC mass detected in groundwater at MW-2 includes: − The dates when the Old and New Landfills operated (i.e., from 1965 to 1984 and 1984 to 1998, respectively) compared to when TCE was first observed in PW (1985); − The magnitude of groundwater impacts at PW and the location of this well hydraulically upgradient of the New Landfill; and − The presence of significant concentrations of contaminated soil vapor at depth immediately adjacent to the Old Landfill at TSSV-1. Evidence that the New Landfill contributes the bulk of the VOC mass detected in groundwater at MW-2 includes: − The predominance of TCE and associated daughter products both in soil vapor in/under the New Landfill and impacted groundwater (1,1-DCE which is predominant in soil vapor under the Old Landfill is not a primary contaminant in groundwater); − The limited extent of groundwater contamination located hydraulically downgradient of the Old Landfill (particularly at MW-3 and MW-8); and − Notable increases in groundwater TCE concentrations at PW, MW-1, and MW-2 in the period after 1997, when operations had been ongoing at the New Landfill for more than 13 years. In any case, both landfills likely contribute in some part to groundwater impacts and distinctions between the two landfills are currently only relevant in terms of targeting impacted regions for treatment. The extent of TCE in groundwater downgradient of the New Landfill has been defined to the 5 µg/L AWQS using the existing monitoring network (see Figure 12). As of August 2012 (the most recent monitoring data collected as of the date of this report), TCE concentrations ranged from less than 5 µg/L in MW-5, MW-6, MW-7, and MW-8 to 105 µg/L in MW-2. Since installation of MW-4, concentrations have increased from 5.2 µg/L in November 2010 to 32.6 µg/L in August 2012. This increase in concentrations downgradient of the site began around August 2011 and indicates a potential for offsite migration of low levels of TCE in groundwater south of the New Landfill. Concentrations are anticipated to decrease in the future at MW-4 based on the currently decreasing TCE concentrations observed upgradient at MW-2. Vertical Distribution of Contamination. Depth-specific sampling was conducted at MW-2 in 2009 to further evaluate the nature and extent of groundwater contamination. Concentrations Maricopa County Cave Creek Landfill Phoenix, AZ November 19, 2012 Page 39 Additional Site Characterization Work Plan ranged from 190 µg/L at approximately 5 ft below the groundwater table to 99 µg/L at 45 ft below the groundwater table. This stratification in TCE concentrations with depth, which results in a relatively thin layer of elevated concentrations at the top of the aquifer, suggests that groundwater contamination is influenced by mass transfer interactions that occur at the groundwater/vadose zone interface. Vertical stratification of TCE concentrations in groundwater with depth has important implications for groundwater monitoring and analysis of associated data. The appendices in this report presenting analytical data indicate an elevation that either the sampling pump or the PDB was set at. The depth of the sampling pump below the groundwater table during each monitoring event is noted in Appendix D. 3.2.2 Transport Mechanisms Based on the available site history, collected data, and results of SVE testing, the following potential mechanisms may be influencing contaminant transport at the site: − Volatilization of contaminants present in waste, landfill leachate and/or impacted soil to LFG and soil vapor; − Vapor-phase convective transport of contaminated LFG/soil vapor both laterally and vertically from the landfill due to pressure, temperature, concentration and/or density gradients (vapor transport is affected by soil permeability; changes in soil permeability due to permeable strata or increasing compaction can promote or impede transport, respectively); − Dissolution of contaminants present in LFG/impacted soil vapor into groundwater at the vadose zone/groundwater table capillary fringe; − Aqueous-phase advective transport of contaminated groundwater in the capillary fringe to the saturated aquifer due to drainage of soil water from a falling groundwater table; − Aqueous-phase advective transport of contaminated leachate and contaminated LFG condensate (due to cooling in regions surrounding the landfill) both laterally and vertically from waste/impacted soil via precipitation/surface water infiltration through the vadose zone to groundwater (infiltration through the waste placed in the landfills is expected to be less significant after operations ceased and the landfill cover was installed); − Adsorption of contaminated leachate and/or condensate to soil with subsequent remobilization via volatilization and desorption due to infiltration; and − Migration (via advection, diffusion/dispersion, etc.) of contaminants present in groundwater with groundwater flow. A graphical depiction of the CSM, including these potential transport mechanisms, is provided in Figure 13. Given the limited amount of infiltration due to the arid climate and absence of any notable indication of leachate impacts in groundwater, vapor phase transport mechanisms are likely to be dominant at CCL. Maricopa County Cave Creek Landfill Phoenix, AZ November 19, 2012 Page 40 Additional Site Characterization Work Plan A remedial action objective (RAO) screening model developed by Walter and Geddis (2002) was used to evaluate whether the concentrations present in deep soil vapor are sufficient to appreciably impact groundwater quality at CCL. This analytical transport model estimates a soil vapor concentration present at the vadose zone/groundwater table interface (CRAO) over a source area of length (L) that can result in a vertically averaged groundwater concentration (Cz,t) at the end of the source length that complies with groundwater remediation goals (e.g., the AWQS). In addition to standard parameters used to characterize groundwater transport and contaminant mass transfer, the model is capable of incorporating a value for infiltration flux (the rate of percolation through the vadose zone that reaches the aquifer or its equivalent due to capillary fringe dewatering as the water table declines) and a mixing zone thickness (the length of submerged screen in a compliance well located at the downgradient edge of the source area) into the calculations. For CCL, soil vapor concentrations above the water table over the length of the New Landfill were estimated using maximum and current observed TCE concentrations at MW-2 from September 2010 to 2012. Model parameters representative of site conditions were as follows: Symbol Used in Model Assumed Parameter Value Horizontal Groundwater Flow Velocity vx 0.135 ft/day Soil bulk density ρD 1.68 g/cm3 Porosity φ 0.30 Fraction of Organic Carbon fOC 0.001 Infiltration Flux qz 1.80 in/yr Source Length Mixing Zone Thickness L b 2,800 ft 118 ft τ αZZ 0.20 10 cm αZX 0.10 cm D0 1.04 E‐5 cm3/sec Model Input Parameter Tortuosity Longitudinal Dispersivity for Infiltration Transverse Dipersivity for Horizontal Flow Aqueous Molecular Maricopa County Cave Creek Landfill Phoenix, AZ Basis for Parameter Value Calculated based on the average observed groundwater gradient at the site in 2012 (0.0027 ft/ft), the hydraulic conductivity estimated by Dames & Moore, 1994 for the site (15 ft/d), and the assumed porosity (0.30). Estimated bulk density for sand and gravel (Maidment, 1993). Assumed porosity for sand and gravel (Domenico and Schwartz, 1998). Observed value for sand (Maidment, 1993) which is within the observed range for arid soils (Walter and Geddis, 2002). Equivalent infiltration rate due to a declining water table (per Walter and Geddis, 2002) calculated using MW‐2 water level data from September 2010 to September 2012 and an assumed specific yield of 0.20 (Fetter, 1994); the rate of percolation/infiltration through the vadose zone to the water table was neglected. The longitudinal length of the New Landfill The submerged screen length of MW‐2 as of September 2012 Walter and Geddis, 2002 Professional judgment based on values summarized by Gelhar et al, 1992 Professional judgment based on values summarized Gelhar et al, 1992 For TCE (University of California at Davis, 1994) November 19, 2012 Page 41 Additional Site Characterization Work Plan Diffusion Coefficient Dimensionless Henry’s Law Coefficient Organic Carbon‐Water Partition Coefficient Concentration of TCE in groundwater Upgradient of the Source Area Target Vertical Average Compound Concentration HD 0.335 KOC 126 Co 0 μg/L Cz,t 450 μg/L (maximum) 105 μg/L (recent) For TCE (EPA, 2012; Temperature dependence evaluated by the OSWER Method at 20 deg C) For TCE (Maidment, 1993) Assumed ambient concentration upgradient of the source area was zero. Maximum and recent (August 2012) TCE concentrations at MW‐2 Calculated soil vapor concentrations (CRAO) for these scenarios were 620 mg/m3 (based on the maximum groundwater concentration of 450 μg/L at MW-2) and 140 mg/m3 (based on the recent groundwater concentration of 105 μg/L at MW-2). Although soil vapor concentrations directly above the water table under the New Landfill have yet to be established (the maximum concentration to date observed at 140 ft bgs under the New Landfill is 95 mg/m3), the maximum TCE concentrations observed at TSSV-1D (2,620 mg/m3) and above the water table at PW (752 mg/m3) in soil vapor suggest that sufficient mass is present at depth to result in observed concentrations with only an equivalent infiltration rate due to the declining water table considered. As it is unlikely that the entire length of the New Landfill is impacted with elevated soil vapor concentrations (given observed soil vapor concentrations at MW-2), it is interesting to note that if the source length (L) is divided in half (1,400 ft), calculated soil vapor concentrations are 1,200 mg/m3 and 280 mg/m3, respectively, which are still within the range of values observed in deep soil vapor at the site. Based on the significant concentrations of TCE present in soil vapor at depth and variable concentrations of TCE in groundwater that show some correlation with a declining regional water table, migration of contamination from the landfills to depth as a dispersed soil gas plume with dissolution of contaminants into groundwater at the capillary fringe and drainage of soil water from a falling groundwater table appear to be the predominant contaminant transport mechanisms resulting in impacts to groundwater at the site. Given this CSM, concentrations at MW-2 are anticipated to continue to vary in the future with both the magnitude/location of the impacted soil gas plume and the rate at which the water table declines. 3.2.3 Identification of Potential Receptors Water supply wells, particularly those used for municipal supply, are likely the primary potential receptors of contamination at the site. Regional groundwater withdrawals appear to impact the direction of groundwater flow at CCL; if attenuation mechanisms controlling the fate and transport of TCE present in groundwater from the site are not sufficient or the quantity of mass released to groundwater over time is significant, TCE may migrate to these potential receptors. Maricopa County Cave Creek Landfill Phoenix, AZ November 19, 2012 Page 42 Additional Site Characterization Work Plan 3.3 Data Gaps On the basis of the current CSM, data gaps that should be filled to support Revised RAP development are summarized by medium below: Groundwater Data Gaps − Although the nature and extent of impacted groundwater downgradient of CCL is currently defined, the rate of groundwater VOC transport in this vicinity is unknown and assessment of the potential for off-site contaminant migration is incomplete. To support development of RAP alternatives, further evaluation of site groundwater contaminant transport mechanisms is needed. Additionally, a quantitative assessment is required to estimate the rate of groundwater extraction necessary to contain the width of the contaminant plume. − Ongoing regional groundwater extraction activities and the use of nearby aquifer storage and recovery wells by the COP and COS have the potential to impact groundwater plume migration at CCL. To date, regional groundwater extraction has influenced groundwater flow directions at the site and has likely contributed to the longterm decline in the groundwater table observed at the site. Although these regional operations have been identified, the extent of both current and future impacts from operations on contaminant transport is unknown. − Natural attenuation of TCE in groundwater is anticipated to be a component of the long-term remedy selected for the site. Based on the results of soil gas monitoring and SVE testing, reductive dehalogenation has occurred at the site and may contribute to future TCE attenuation. It is unknown whether reductive dehalogenation is occurring solely within the landfill and/or at depth and whether conditions are present to promote complete conversion of TCE to ethene in the groundwater. Soil Vapor Data Gaps − The most significant data gap impacting selection of an appropriate remedy for the site is a clear understanding of the nature and extent of deep VOC-impacted soil vapor underlying the site. The considerable VOC mass present in soil vapor at depth likely serves as an ongoing source of contamination to groundwater. Thus, any remedy that addresses groundwater without addressing soil vapor will not remediate the groundwater within a reasonable timeframe. Reliable information regarding the concentration of VOCs at significant depth (i.e., greater than 140 ft bgs) is currently only available at TSSV-1 and PW, both of which are located in the same vicinity (the waste transfer station area). This information is insufficient to estimate how much contaminant mass is present in the subsurface and how that mass is distributed in the deep vadose zone. − Extended SVE testing has identified an issue with how representative short-term grab sampling is for deep soil vapor characterization using existing vapor well construction. Due possibly to the large well casing volumes associated with these deep wells and the rates used in testing, concentrations do not appear to stabilize during continuous extraction until significant volumes have been removed. Although stabilization of TCE concentrations was Maricopa County Cave Creek Landfill Phoenix, AZ November 19, 2012 Page 43 Additional Site Characterization Work Plan observed in TSSV-1-S and TSSV-1-M during extended SVE testing, the duration of how long extraction must occur to achieve stabilization is not well defined for the deepest well tested. At TSSV-1-D, TCE concentrations were increasing when the Extended SVE Pilot Test was concluded. − Given the nature of contaminants and inherent permeability of site soil, SVE is expected to be a component of the final remedy selected for the site. A good understanding of sitespecific parameters that impact the design of an effective system is currently limited. To date, both radial and vertical influence have not been adequately evaluated due primarily to a lack of appropriately screened observation wells during SVE testing. There is some information regarding compaction of the alluvium with depth and relative impacts on extraction rates but there is limited quantitative information regarding bulk porosity, soil moisture, and organic content as collection of intact soil samples at depth has not been possible to date. − For the long-term remedy selected for the site, assessment of an appropriate SVE vapor treatment technology will not be straightforward. The V-GAC treatment technology used during pilot testing is generally a presumptive approach to address chlorinated compounds in extracted vapor at low concentrations. However, at the high concentrations observed during the Extended SVE Pilot Test, carbon usage rates were significant and the carbon had to be removed as hazardous waste. On this basis, technology selection will need to be based on numerous factors including the concentration of target contaminants, estimated extraction flow rates, the required duration of extraction, the composition of other compounds present in extracted vapors, and the availability of support infrastructure (e.g., utilities). To compound the complexity of this assessment, interim testing of significant duration will likely be required to further characterize the nature and extent of soil vapor underlying the site and implementation of a treatment technology prior to long-term remedy development would control project costs. − As indicated above, it is currently unknown whether reductive dehalogenation is occurring solely in the landfills and/or at depth. If this microbially mediated process is occurring at depth, a carbon source is serving as the electron donor and may be present in landfill leachate that has migrated to depth. The impact of this potential pathway on groundwater contamination is undefined. Maricopa County Cave Creek Landfill Phoenix, AZ November 19, 2012 Page 44 Additional Site Characterization Work Plan 4.0 WORK REQUIRED TO SUPPORT RAP DEVELOPMENT 4.1 Objective and Approach As identified in Section 3.3 (Data Gaps), additional site characterization information is required to adequately develop and select a long-term remedy to address groundwater impacts at CCL. The objective of the additional site characterization activities identified in this Work Plan is to fill, to the extent practicable, data gaps necessary to prepare a Revised RAP. The most significant data gap impacting selection of an appropriate long-term remedy for the site is a clear understanding of the nature and extent of VOC-impacted deep soil vapor underlying the site. To this end, additional soil vapor monitoring wells will be installed and tested while groundwater monitoring is conducted to promote ongoing evaluation of groundwater impacts. In keeping with the approach presented in the Extended Soil Vapor Extraction Pilot Test Work Plan prepared by AMEC in 2011, application of a known and effective treatment technology (i.e., SVE) will also continue during additional site characterization activities. This approach will address groundwater impacts underlying CCL by removing contaminant mass from the subsurface and provide feedback regarding technology effectiveness while advancing development of the Revised RAP. Desktop studies will be conducted in parallel with field program planning to evaluate SVE treatment technologies and assess groundwater flow and contaminant transport at the site. Details regarding these studies and planned field programs are presented in the following sections. A schedule for implementation of additional site characterization activities is presented in Section 4.5. 4.2 Planned Desktop Studies 4.2.1 Soil Vapor Treatment Technology Evaluation As indicated by the Extended SVE Pilot Test, treatment of extracted soil vapors using V-GAC is effective in controlling VOC emissions from soil vapor extraction operations at the site. However, high concentrations of TCE in deep soil vapor can result in a significantly high rate of carbon usage and disposal of the carbon as hazardous waste may be required. To ensure that the most appropriate and cost-effective SVE treatment technology is selected for both initial testing of planned deep soil vapor wells and the long-term site remedy, a Cost-Benefit analysis of treatment technology alternatives will be conducted in advance of additional soil vapor monitoring well installation. At a minimum, evaluated treatment technologies will include: − V-GAC; − Thermal oxidation with a scrubber system; and − Vapor condensation. Each of these treatment technologies is anticipated to be effective in treating extracted vapors at the site so the driving evaluation criteria will be cost and ease of implementation (i.e., Maricopa County Cave Creek Landfill Phoenix, AZ November 19, 2012 Page 45 Additional Site Characterization Work Plan required lead time, permitting, and flexibility). The evaluation will include development of a treatment technology description with associated infrastructure requirements and costs for a preliminary equipment configuration to address a common design basis. The design basis will be derived from data collected during the Extended SVE Pilot Test and include: − Concentrations of target contaminants; − An estimated extraction flow rate; and − The composition of other compounds present in extracted vapors that may adversely impact treatment processes (e.g., Freon-113 and methane). To adequately compare these systems, evaluation of comparative costs over time will be required (i.e., both capital and operational costs will be developed). A sensitivity analysis involving assessment of a range of contaminant concentrations and extraction flow rates will also be necessary to evaluate how flexible a given system is in treating vapors from various test locations. Following the completion of this evaluation, a report will be prepared for ADEQ review and comment. This report will be the basis for design of an SVE treatment system used in initial SVE testing, continued SVE operations during Revised RAP development, and possibly long-term soil vapor remediation at the site. 4.2.2 Groundwater Transport Modeling As identified in the groundwater data gaps section, issues related to the potential migration of contamination from the site require further assessment. With respect to RAP preparation, a more robust analysis of groundwater flow and contaminant transport rates at the southern site boundary is necessary to select an appropriate groundwater remedial strategy. Groundwater transport modeling will be conducted to support this analysis. Questions to be investigated include the following: − Given a reasonable estimation of the potential extent of the groundwater contamination source area: • What mechanisms are dominating contaminant transport in groundwater at the site (i.e. advection, dispersion, etc.)? • What is the current rate of groundwater plume migration underlying the source area? − What is the current rate of groundwater plume migration from the site at the southern site boundary? − Is the migration of groundwater contamination currently controlled by the rate of natural attenuation? Maricopa County Cave Creek Landfill Phoenix, AZ November 19, 2012 Page 46 Additional Site Characterization Work Plan − If offsite groundwater contaminant migration is not controlled by natural attenuation, what rate of groundwater extraction is necessary to contain the leading edge of the groundwater contamination plume? − What is the most effective and/or efficient groundwater extraction configuration? − What would the impact of groundwater extraction (i.e., the localized lowering of the water table around the pumping well) be on the rate of contaminant transport into groundwater from contaminated soil vapor? − How long would leading edge groundwater extraction be required if contaminated soil vapor is adequately controlled and the contaminant source reduced? − What is the impact of off-site groundwater extraction operations on groundwater plume migration? Groundwater modeling will include construction a basic, 1-layer numeric groundwater model using readily available, existing data for the site area. Boundary conditions will be utilized to simulate the effects of nearby groundwater production/recharge on site groundwater conditions. Model development will occur in phases to promote adequate regulatory review and concurrence: − Phase 1: Model definition and technical approach development. This phase of development will include information gathering, documentation of the proposed technical approach to model construction, and identification of basic model inputs and initial modeling goals. − Phase 2: Model construction and calibration. This phase will include construction of the model to address initial modeling goals, a sensitivity analysis to evaluate controlling input parameters that impact groundwater extraction rates in particular (such as boundary conditions), and calibration of the model with available site data. A capture zone analysis with particle tracking will be used to visualize capture zones during assessment of required extraction rates for plume containment. Any remaining goals that were not addressed during this phase will be identified for evaluation during model refinement. − Phase 3: Model refinement. This phase will build upon the model developed in Phase 2 and will likely address questions that are more temporal in nature (e.g., how long will extraction be required?). Additionally, if supplemental information resulting from planned field investigations is available (e.g., the nature and extent of the soil vapor plume that serves as the source of contamination to groundwater), these data will be considered during model refinement for additional calibration, as necessary. At the completion of each phase, a technical memorandum will be prepared for ADEQ review and comment that summarizes the results of modeling activities performed. A data gap analysis will be performed during each phase of model development and the results will be documented in the respective technical memoranda. Maricopa County Cave Creek Landfill Phoenix, AZ November 19, 2012 Page 47 Additional Site Characterization Work Plan 4.3 Planned Field Programs 4.3.1 Soil Vapor Well Installation and Testing 4.3.1.1 Vapor Well Installation A minimum of three new soil vapor monitoring well installations will be completed prior to Revised RAP development. Due to the depths involved, the unconsolidated alluvial sediments present at the site, and issues encountered during drilling of TSSV-1, a Well Planning Evaluation was recently submitted to ADEQ for review. The evaluation includes a review of applicable drilling strategies, the capabilities of local drilling firms, and associated well installation costs. Minimum soil vapor well requirements are as follows: − Well installations will include at least three nested soil vapor wells in the same borehole with screened intervals located at elevations similar to TSSV-1 to allow for the collection of comparable data during SVE testing and vapor plume evaluation; − Wells will be installed in boreholes drilled without mud or stabilizing additives (as practicable) to promote use of the wells for SVE (dust control during drilling will need to be addressed); − Wells will be a minimum of two inches in casing diameter to promote use of the wells for SVE; − Screened casing slot size and annular fill materials will be similar to TSSV-1 to promote relative assessment of collected SVE data; and − If wells are completed within the footprint of landfills, the wells must be drilled and constructed in a manner that will protect site workers from any hazardous conditions within the landfill during drilling and must limit the potential for the nested well installation to serve as a conduit for contaminants present in the landfill to further impact groundwater (either during drilling or after well completion). In addition to the minimum requirements identified above, the following secondary requirements were considered during the Well Planning Evaluation: − If possible, the selected drilling strategy will allow for the collection of intact soil samples to assess soil properties at depth; and − If possible, the well design will include a small diameter groundwater well for use with PDBs or dedicated groundwater sampling tool (e.g., BarCad) to allow for the collection of groundwater samples at planned soil vapor well locations. The Well Planning Evaluation documents a conceptual well design incorporating these requirements and will serve as a task-specific work plan for well installation activities. Following Maricopa County Cave Creek Landfill Phoenix, AZ November 19, 2012 Page 48 Additional Site Characterization Work Plan ADEQ concurrence with the Well Planning Evaluation, contracting of the driller and well/dust control permitting will be conducted. Figure 14 presents the planned locations of the three initial nested well locations (TSSV-2, TSSV-3, and TSSV-4) and a potential fourth nested well location (TSSV-5) that will be considered during the drilling program. The purpose of each planned well is as follows: − TSSV-2 will be located approximately 250 ft east of existing well TSSV-1 (near P-23) to support assessment of radial influence during SVE testing. − TSSV-3 will be located near the approximate boundary of Cells A and B in the New Landfill, along the known extent of refuse. This well installation will be located about 1,700 ft south of PW and 1,200 ft north of MW-2 to evaluate the southern extent of soil vapor impacts as well as provide additional information supporting groundwater quality across the extent of the New Landfill. The location is in a region that can readily be contoured for drill rig access. − TSSV-4 will be located in the northern portion of the New Landfill, near NDP-01, to assess the western extent of soil vapor impacts, beneath the New Landfill. − If installed, TSSV-5 would be located approximately 450 ft east of TSSV-2 to assess the eastern extent of soil vapor impacts, near the Old Landfill. Following installation of TSSV-2 through TSSV-4, a passive soil gas study will be conducted at all completed wells and intervals (including TSSV-1). It is not anticipated that active purging of the wells will occur prior to the passive study due to the logistics associated with the required duration of extraction and treatment of vapors. If conducted, the results of the passive soil gas study would be used to determine whether TSSV-5 should be installed and/or if the planned location identified in Figure 14 is appropriate. The results of well installation activities and the passive soil gas study will be summarized in monthly site status reports and presented in detail in the Revised RAP. 4.3.1.2 Initial Vapor Well Testing Following completion of the Soil Vapor Treatment Technology Evaluation, SVE and treatment system equipment required for testing will need to be permitted (as applicable), procured and installed at the site in the TSSV-1 treatment compound. These activities will likely be conducted concurrent with the well installation program so that when the wells are installed, testing can begin. Each completed well will be subject to a soil vapor test comparable to the Extended SVE Test conducted at TSSV-1 (i.e., each well will serve as the SVE test well and surrounding wells will be used to evaluate influence). SVE will be conducted from the individual intervals in each test well for a minimum of 8 days to yield data that are similar to the Extended SVE Pilot Test. For all wells except TSSV-3, extracted vapors will be piped to the TSSV-1 treatment compound for processing. Testing of TSSV-3 will likely require use of a generator-operated blower and VGAC/Hydrosil treatment system at the TSSV-3 wellhead. Due to this configuration, the duration Maricopa County Cave Creek Landfill Phoenix, AZ November 19, 2012 Page 49 Additional Site Characterization Work Plan of testing may not be comparable to the other wells and will generate carbon that will have to be profiled to determine if it is hazardous waste. The primary objectives of vapor well testing will include: − Collection of representative concentrations of VOCs in extracted soil vapor to delineate the nature and extent of the soil vapor plume and refine the CSM; − Estimation of the horizontal and vertical pneumatic conductivity of vadose zone soils to refine the CSM and support remedial design; − Evaluation of radial and possibly vertical influence of SVE operations conducted at the site in the deep vadose zone to support remedial design; and − Mass removal. The results of testing will be summarized in monthly site status reports and presented in detail in the Revised RAP. 4.3.2 Soil Vapor Extraction Operations If the treatment technology selected for the site is operational prior to the installation of new soil vapor wells, SVE operations in TSSV-1 will resume during the interim period between well installation and new well testing. Following new well testing, extraction from at least one of the site soil vapor wells will be conducted on a routine basis while Revised RAP development progresses. Selection of the well or wells to be extracted from will be based on the results of initial vapor well testing. The objective of operations will be contaminant mass removal from the subsurface. Summary results of ongoing SVE operation will be presented in site status reports on a quarterly basis (based on the calendar year) and will include: − Identification of the well or wells extracted from; − Rates and duration of extraction; − An estimate of mass removed during operations; and − A narrative description of any significant issues encountered during operation. 4.3.3 Groundwater Monitoring Monthly groundwater elevation monitoring and quarterly groundwater sampling will continue during implementation of the additional site characterization activities presented in this Work Plan. To further assess groundwater data gaps presented in Section 3.3, the following supplementary activities will also be conducted: − If feasible, new soil vapor monitoring wells will include a small diameter groundwater well to allow for the collection of passive groundwater samples at planned well locations. These Maricopa County Cave Creek Landfill Phoenix, AZ November 19, 2012 Page 50 Additional Site Characterization Work Plan wells are located between PW and MW-2 and should significantly progress the understanding of contaminant distribution in groundwater under the New Landfill. − Field parameter monitoring during routine groundwater well purging will be expanded to include use of a flow-through cell with measurement of redox potential (i.e., Eh), dissolved oxygen, pH, and conductivity; the stabilized readings will be added as a new class of data to the project database. These readings will aid in the assessment of reductive dechlorination currently occurring at the site. − Total organic carbon, dissolved organic carbon, ethene, ferric and ferrous iron, and Freon113 will be added to the groundwater monitoring program for a minimum period of six quarterly monitoring periods. The results of ongoing groundwater monitoring will continue to be summarized in monthly site status reports and will be presented in detail in the Revised RAP. 4.4 Development of the Revised RAP As identified in previous sections, the results of the Soil Vapor Treatment Technology Evaluation and Groundwater Transport Modeling will be documented in separate reports submitted for review by ADEQ prior to preparation of the Revised RAP. These reports will form the basis for the development of remedial alternatives for the site. Given the CSM, soil vapor extraction is likely to be developed as a remedial technology to address the significant VOC mass present in impacted soil vapor. In addition to how extracted vapors will be treated, the Revised RAP will have to define the areal extent and what depth intervals will be targeted for treatment. For contaminated groundwater, the following remedial alternatives will be evaluated: − Monitored Natural Attenuation (MNA); − Leading edge containment of the groundwater contaminant plume via groundwater extraction with wellhead treatment; and − In situ treatment of contaminated groundwater at the leading edge of the groundwater plume (likely with chemical oxidation and/or a well recirculation technology). If the rate contaminant migration can be reasonably controlled by the rate of contaminant natural attenuation, Monitored Natural Attenuation (MNA) of TCE in groundwater will likely be developed as a remedial approach to address impacted groundwater. In this instance, the Revised RAP will have to consider alternative monitoring programs that adequately demonstrate that the TCE groundwater plume is stable. If a more expedited groundwater remediation strategy is required, leading edge containment of the groundwater contaminant plume will be implemented. Maricopa County Cave Creek Landfill Phoenix, AZ November 19, 2012 Page 51 Additional Site Characterization Work Plan 4.5 Project Schedule Given the significant amount of data that is required to adequately prepare a Revised RAP, an aggressive project schedule has been developed to progress the project while continuing removal of mass from the subsurface. Estimated time frames for planned activities, a description of associated reporting, and documentation milestones are summarized below: Activity Estimated Time Frame Vapor Well Installation Planning Soil Vapor Treatment Technology Evaluation Vapor Well Installation Activities August 2012 – October 2012 Groundwater Transport Modeling Vapor Well Initial Testing SVE Operations* Groundwater Monitoring Revised RAP Development August 2012 – November 2012 October 2012 – April 2013 November 2012 – June 2013 May 2013 – August 2013 September 2013 ‐ Ongoing Ongoing September 2013 – February 2014 Associated Documentation Well Planning Evaluation Technical Memorandum Soil Vapor Treatment Technology Report Monthly Status Reports Revised RAP Phase 1 Modeling Report Phase 2 Modeling Report Phase 3 Modeling Report Monthly Status Reports Revised RAP Monthly Status Reports Revised RAP Monthly Status Reports Revised RAP Revised RAP Documentation Milestone October 15, 2012 November 30, 2012 Not Applicable December 21, 2012 March 15, 2012 June 28, 2012 Not Applicable Not Applicable Not Applicable February 28, 2013 Notes: * If the selected soil vapor treatment system can be constructed and permitted prior to new well Initial Testing, extraction from TSSV‐1 will be conducted on an interim basis. It should be emphasized that site characterization projects progress based on results of investigations that are difficult to fully anticipate during future work planning. There is inherent uncertainty regarding subsurface conditions, contamination extent, and conditions that are outside the control of those involved in conducting site characterization activities. These factors have the potential to adversely impact the project schedule. Maricopa County Cave Creek Landfill Phoenix, AZ November 19, 2012 Page 52 Additional Site Characterization Work Plan 5.0 REFERENCES ADEQ, 2006. New Monitoring Well at the Cave Creek Landfill. Letter to the Maricopa County Solid Waste Management Department from the ADEQ Solid Waste Inspections and Compliance Unit. August 31, 2006. ADEQ, 2010. Consent Order In the Matter of Cave Creek Landfill Located at 8.3 Miles East of I17 Approximately ½ Mile South of Carefree Highway, Phoenix, Maricopa, Arizona: Docket No. S-2-10, Azurite Place ID 1169, Dated January 19, 2010. ADWR, 2006. Salt River Valley Model Geology Update – Provisional Report. Modeling Report No. 16. October 10, 2006.ADWR, 2012. Groundwater Site Inventory (GWSI) database. Queried May 2012. AMEC, 2009. Addendum to the Cave Creek Landfill Groundwater Characterization Work Plan. ADEQ Consent Order No. S-102-05. Report prepared for the Maricopa County Solid Waste Management Department. May 11, 2009. Job Number 09-114-03000. AMEC, 2011a. Extended Soil Vapor Extraction Pilot Test Work Plan. Cave Creek Landfill. Report prepared for the Maricopa County Risk Management Department and Solid Waste Management Department. June 30, 2011. Job Number 1420102023. AMEC, 2011b. Revised Interim Summary Technical Memorandum. Cave Creek Landfill, Phoenix, Arizona. Memorandum prepared for the ADEQ. August 16, 2011. Job Number 1420102023. BAS, 2005. Maricopa County Waste Management Department Cave Creek Landfill Groundwater Characterization Work Plan. Prepared for Maricopa County Solid Waste Management Department. August 26, 2005. Chou, Jack, 1999. Hazardous Gas Monitors: A Practical Guide to Selection, Operation, and Applications. McGraw-Hill. Korea. Corell, S.W., and Corkhill, E.F. 1994. A Regional Groundwater Flow Model of the Salt River Valley – Phase II, Phoenix Active Management Area Numerical Model, Calibration and Recommendations. ADWR Hydrology Division, Modeling Report No. 8. March. Corkhill, E.F, Corell, S., Hill, B.M., Carr, D.A., 1993. A Regional Groundwater Flow Model of the Salt River Valley - Phase I, Phoenix Active Management Area Hydrogeologic Framework and Basic Data Report. ADWR Hydrology Division, Modeling Report No. 6. April. COP, 2011. Pre-Submittal Meeting Minutes, Aquifer Storage and Recovery Well (9A- Well #300), Construction Administration and Inspection Services, WS85010044, May 27, 2011. COP, 2012. City Council Meeting Minutes from April 18, Item 82. Maricopa County Cave Creek Landfill Phoenix, AZ November 19, 2012 Page 53 Additional Site Characterization Work Plan Dames and Moore, 1994. Maricopa County Waste Solid Management Department Cave Creek Landfill Aquifer Protection Permit Application, Volumes 1 and 2. Prepared for Maricopa County Solid Waste Management Department. February 17, 1994. Domenico, P.A. and F.W. Schwartz, 1998. Physical and Chemical Hydrogeology. 2nd Edition. John Wiley & Sons, Inc. New York. COP Parks, Recreation, and Library Department, 1998. Sonoran Preserve Master Plan, An Open Space Plan for the Phoenix Sonoran Desert. Principal authors: James Burke and Joseph Ewan. Edited by Audrey Brichetto Morris. Published by the Herberger Center for Design Excellence College of Architecture and Environmental Design at Arizona State University. February 17, 1998. EPA, 2012. Hydraulic Gradient – Magnitude and Direction. EPA On-line Tools for Site Assessment Calculation. http://www.epa.gov/athens/learn2model/part-two/onsite /gradient4 plus-ns.html. Last accessed August 2012. EPA, 2012. Estimated Henry’s Law Constants, EPA On-Line Tools for Site Assessment Calculation. http://www.epa.gov/athens/learn2model/part-two/onsite/esthenry.html. Last accessed November 2012. Fetter, C.W., 1994. Applied Hydrogeology. Third Ed. Prentice-Hall, Inc. Upper Saddle River, New Jersey. Freihoefer, A., Mason, D., Jahnke, P., Dubas, L., and Hutchinson, K., 2009. Regional Groundwater Flow Model of the Salt River Valley Phoenix Active Management Area Model Update and Calibration, ADWR Hydrology Division Modeling Report No. 19, April. Gelhar, L.W., C. Welty, and K.R. Rehfeldt, 1992. A Critical Review of Data on Field Scale Dispersion in Aquifers. Water Resources Research, Vol. 28, No. 7. Pgs 1955-1974. July 1992. Littin, G.R., 1979. Maps showing ground-water conditions in the New Driver-Cave Creek area, Maricopa and Yavapai counties, Arizona; 1977. Water Resources Investigation Report 79-1068. Maidment, D.R., 1993. Handbook of Hydrogeology. McGraw-Hill, Inc. New York. Maricopa County, 2011. Maricopa County Cave Creek Landfill, Focused Work Plan for Groundwater Characterization Near Old Landfill. Letter prepared by the Maricopa County Solid Waste Management Department submitted to the ADEQ. September 6, 2011. Rae Systems Inc., 2010. Correction Factors, Ionization Energies, Characteristics. Technical Note TN-106. Revised 08/2010. Maricopa County Cave Creek Landfill Phoenix, AZ November 19, 2012 and Calibration Page 54 Additional Site Characterization Work Plan Rascona, S.J., 2004. Maps Showing Groundwater Conditions in the Phoenix Active Management Area: Maricopa, Pinal, and Yavapi Counties, Arizona – Nov. 2002-Feb. 2003. ADWR Hydrologic Map Series Report No. 35. SCS, 2005. Soil Vapor Assessment Report. Cave Creek Landfills. Report prepared for the Maricopa County Risk Management Department. July 8, 2005. File Number 10.203045.01. SCS, 2008. Soil Vapor Assessment Report. Cave Creek Landfills, 3955 East Carefree Highway, Phoenix. Arizona. Letter prepared for the Maricopa County Risk Management Department. April 15, 2008. File Number 10.203045.01. University of California at Davis, 1994. Intermedia Transfer Factors for Contaminants Found at Hazardous Waste Sites, Trichloroethylene (TCE) – Final Draft Report. Prepared by the Risk Science Program of the Department of Environmental Toxicology for the Office of Scientific Affairs, Department of Toxic Substances Control and the California Environmental Protection Agency. December 1994. USGS, 2012. Stream Flow Measurements for the Nation, USGS Site Number 09512280 (Cave Creek Blw Cottonwood Cr Near Cave Creek, Az). http://waterdata.usgs.gov/nwis/measurements/?site_no=09512280&. Walter, G.R. and Geddis, A.M, 2002. A Screening Model to Establish Remediation Objectives Based on Soil Gas Concentrations. Presented at AHS First Biennial Symposium on Scientific Issues Related to Landfill Management in Arid and Semi-Arid Regions, Tucson, AZ, June 2002.Weather.com, 2012, Monthly Averages for Cave Creek, Arizona. http://www.weather.com/weather/wxclimatology/monthly/85327. Maricopa County Cave Creek Landfill Phoenix, AZ November 19, 2012 Page 55 TABLES Table 1. Site History Date 1965 to 1984 1982 1984 to 1998 October 1982 Cave Creek Landfill, Maricopa County Event Significance County operation of the Old CCL on land leased from the BLM; this landfill closed in 1984. County leases New CCL property from the ASLD. Defines the period when waste was placed in the Old CCL. Allows for expansion of landfill operations. County operation of the New CCL; the New CCL ceases accepting waste in 1998. Installation of the Production Well. Defines the period when waste was placed in the New CCL. Change in site infrastructure. The Production Well was installed to supply water for fire and dust control purposes. First indication of TCE contamination underlying the landfill. September 1985 Intermittent groundwater sampling from Production Well begins; TCE detected in September and October 1985 and is not detected again until May 1998. 1990 County purchases the New CCL property and Change in property ownership and expansion of landfill buffer areas (includes retention areas). site. 1992 City of Phoenix annexes the site. Defines period when the property is located within City boundaries. 1993 Installation of MW‐1 and MW‐2 Initiation of the site groundwater monitoring program. April 1994 Installation of landfill perimeter soil gas Initiation of the site landfill gas monitoring monitoring wells (P Wells) program. September 23, 1994 Restrictive Covenant placed on landfill property Administrative restriction placed on site use. at the County’s request. September 1995 Installation of supplemental P Wells. Circa 1996 Initiation of LFG collection system operation. 1997 December 1997 Southern portion of New CCL lined. TCE detected in groundwater from MW‐1 at concentrations exceeding the applicable AWQS. County constructs transfer station in northern portion of the site. County enters into Consent Order (CO) with ADEQ to characterize the nature and source of groundwater contamination. 1998 August 15, 1999 1999 January 2000 June 2002 November 2004 7/13/2012 Expansion of the site landfill gas monitoring program in response to elevated methane concentrations in select P Wells. Change in site operations. Change in site infrastructure. Impetus for Consent Order. Change in site infrastructure. Impetus for additional groundwater monitoring and assessment of regional sources of TCE contamination. Soil gas samples collected from LFG collection system and select P wells evaluated for chlorinated VOCs. TCE detected at concentrations typically observed in MSW landfills (400‐500 ppbV); 26 ppbV TCE detected in one P well located in the southwestern portion of the site. Water table drops below the screened interval in Collection of water samples from MW‐1 no longer MW‐1. possible. Water table drops below the pump intake in MW‐ Water samples collected from MW‐2 with bailer 2. after this date. Characterization of shallow soil gas in existing P TCE, DCE, and toluene detected in select P Wells wells, the Old CCL (via the installation of ODP‐1 (predominantly in the vicinity of the Transfer through ODP‐4) and the New CCL (via the Station/Production Well) and the New CCL at low installation of NDP‐1 and NDP‐2). concentrations. Page 1 of 3 Table 1. Site History Date January 20, 2005 February 2005 June 28, 2005 August 25, 2005 July 2007 August 2007 Cave Creek Landfill, Maricopa County Event Significance Extension of Production Well perforations deeper Significant change in Production Well construction. into the aquifer. Deepening of MW‐1 and MW‐2. Significant change in MW‐1 and MW‐2 construction. County enters into a CO with ADEQ to Requires submittal of a groundwater characterization work plan and a well drilling plan; characterize and remediate contaminated implementation and documentation of the work groundwater. plan; notification of offsite impacts, as applicable; submittal of a remedial action plan; discussion of planned corrective measures in a public meeting; implementation of the remedial action plan; and status reporting. Identifies plan to install MW‐3 and presents a CSM. County submittal of the Cave Creek Landfill Groundwater Characterization Plan (Work Plan). LFG collection system shut down. Change in site operations. MW‐1 becomes obstructed during an attempt to No data collected from MW‐1 after this date. raise the dedicated submersible pump. December 2007 Installation of MW‐3. Expansion of site groundwater monitoring program. January 2008 Sampling of landfill vapor monitoring locations. November 5, 2008 County submittal of the Cave Creek Landfill Groundwater Remedial Action Plan (RAP). TCE detected at low concentrations in samples collected from the New CCL; concentrations are slightly higher than observed in 2004/2005. Documents an approach to address contamination based on a groundwater transport model. Remedial approach includes: operation of the LFG collection system; expansion of the LFG system if necessary; regular monitoring; installation and pumping of a new down‐gradient pumping well; and installation of an irrigation system to manage purge water. May 11, 2009 County submittal of the Addendum to the Cave Creek Landfill Groundwater Characterization Plan (Addendum). May ‐ June 2009 June 25, 2009 January 19, 2010 7/13/2012 Identifies activities supporting downgradient and lateral groundwater contaminant plume definition through the installation of test borings and monitoring wells, vertical characterization of contamination at MW‐2 with passive diffusion bag samplers, and adjustment of the pump depth at MW‐3. Vertical water quality profiling of groundwater at TCE concentrations decrease with depth from the MW‐2. soil‐water interface. Pump depths in PW, MW‐2 and MW‐3 adjusted Pumps placed at a consistent depth below the per the Addendum. water table for more comparable data. ADEQ issues a Revised CO. Requires implementation of the Work Plan and Addendum; the submittal of documentation describing the results of implementation activities; submittal of a Revised RAP; and monthly status reports. Page 2 of 3 Table 1. Site History Date Cave Creek Landfill, Maricopa County Event Significance October 2010 ‐ May 2011 Installation of MW‐4, MW‐5, and MW‐6. August 16, 2011 County submittal of Revised Interim Technical Summary Memorandum . County submittal of the Focused Workplan for Presents a plan for evaluating whether the Old CCL Groundwater Characterization Near Old Landfill . is a significant source of groundwater contamination via the installation of MW‐8. Installation of MW‐7 and MW‐8 Expansion of site groundwater monitoring program. September 6, 2011 November 2011 ‐ February 2012 November 2011 ‐ February 2012 January and March 2012 Expansion of site groundwater monitoring program; definition of the downgradient extent of groundwater impacts. Extended Soil Vapor Extraction Pilot Test Elevated concentrations of TCE detected in deep soil gas. Select P wells along the eastern perimeter of the Low concentrations of TCE detected. New CCL sampled. Notes: Addendum = Addendum to the Work Plan ADEQ = Arizona Department of Environmental Quality ASLD = Arizona State Land Department AWQS = Aquifer Water Quality Standard BLM = Bureau of Land Management CCL = Cave Creek Landfill CO = Consent Order DCE = Dichloroethene LFG = landfill gas MSW = Municipal Solid Waste ppbV = parts per billion by volume RAP = Remedial Action Plan SWICU = Solid Waste Inspection and Compliance Unit TCE = Trichloroethene Work Plan = CCL Groundwater Characterization Plan 7/13/2012 Page 3 of 3 Table 2. Well Construction Summary WellName Cave Creek Landfill, Maricopa County Location Type Use ADWR ID Northing Easting TOC (ft amsl) Total Well Depth (ft) GW-01 Gas Well LFG Extraction - 12268590.1 1337521.7 1,900.0* 57 1/6/1998 6 inch 18 54 1,882.0 - - - GW-02 Gas Well LFG Extraction - 12268409.9 1337532.0 1,900.0* 43 1/6/1998 6 inch 12 40 1,888.0 - - - GW-03 Gas Well LFG Extraction - 12268251.0 1337519.8 1,900.0* 49 1/7/1998 6 inch 13 45 1,887.0 - - - GW-04 Gas Well LFG Extraction - 12268104.9 1337522.8 1,900.0* 47 1/7/1998 6 inch 13 45 1,887.0 - - - GW-05 Gas Well LFG Extraction - 12267952.1 1337522.2 1,900.0* 49 1/7/1998 6 inch 13 45 1,887.0 - - - GW-06 Gas Well LFG Extraction - 12267796.0 1337520.8 1,900.0* 62 1/8/1998 6 inch 23 59 1,877.0 - - - GW-07 Gas Well LFG Extraction - 12267642.0 1337517.3 1,900.0* 53 1/8/1998 6 inch 14 50 1,886.0 - - - GW-08 Gas Well LFG Extraction - 12267485.1 1337515.9 1,900.0* 51 1/11/1998 6 inch 14 48 1,886.0 - - - GW-09 Gas Well LFG Extraction - 12267335.3 1337516.7 1,900.3 51 1/11/1998 6 inch 14 47 1,886.3 - - - GW-10 Gas Well LFG Extraction - 12267174.1 1337440.0 1,900.1 63 1/12/1998 6 inch 21 61 1,879.1 - - - GW-11 Gas Well LFG Extraction - 12267164.9 1337582.5 1,902.0* 53 1/12/1998 6 inch 13 49 1,889.0 - - - GW-12 Gas Well LFG Extraction - 12267025.9 1337509.6 1,910.0* 70 1/14/1998 6 inch 39 69 1,871.0 - - - GW-13 Gas Well LFG Extraction - 12267107.3 1337775.9 1,903.0* 47 1/13/1998 6 inch 12 44 1,891.0 - - - GW-14 Gas Well LFG Extraction - 12266978.9 1337874.1 1,900.0* 53 1/13/1998 6 inch 16 60 1,884.0 - - - GW-16 Gas Well LFG Extraction - 12266887.9 1337683.8 1,910.0* 78 1/13/1998 6 inch 37 77 1,873.0 - - - GW-18 Gas Well LFG Extraction - 12266844.9 1337273.8 1,896.0* 71 1/16/1998 6 inch 30 70 1,866.0 - - - GW-19 Gas Well LFG Extraction - 12266843.4 1337418.4 1,904.0* 71 1/14/1998 6 inch 37 70 1,867.0 - - - GW-20 Gas Well LFG Extraction - 12266981.6 1337324.4 1,902.0* 71 1/18/1998 6 inch 36 70 1,866.0 - - - GW-21 Gas Well LFG Extraction - 12267132.5 1337294.0 1,900.0* 76 1/18/1998 6 inch 41 75 1,859.0 - - - GW-22 Gas Well LFG Extraction - 12267268.8 1337308.5 1,902.0* 70 1/19/1998 6 inch 34 69 1,868.0 - - - GW-23 Gas Well LFG Extraction - 12267414.9 1337319.3 1,902.0* 72 1/20/1998 6 inch 36 71 1,866.0 - - - GW-24 Gas Well LFG Extraction - 12267567.6 1337316.1 1,902.0* 70 1/21/1998 6 inch 34 69 1,868.0 - - - GW-25 Gas Well LFG Extraction - 12267714.2 1337319.6 1,901.0* 70 1/21/1998 6 inch 34 69 1,867.0 - - - GW-26 Gas Well LFG Extraction - 12267866.0 1337317.2 1,901.0* 65 1/22/1998 6 inch 29 64 1,872.0 - - - GW-27 Gas Well LFG Extraction - 12268020.0 1337317.9 1,901.0* 68 1/27/1998 6 inch 32 67 1,869.0 - - - GW-28 Gas Well LFG Extraction - 12268171.2 1337316.1 1,900.0* 55 1/27/1998 6 inch 19 54 1,881.0 - - - GW-29 Gas Well LFG Extraction - 12268313.2 1337318.0 1,900.0* 68 1/27/1998 6 inch 34 68 1,866.0 - - - GW-30 Gas Well LFG Extraction - 12268459.0 1337328.8 1,899.0* 50 1/28/1998 6 inch 15 49 1,884.0 - - - GW-31 Gas Well LFG Extraction - 12268613.4 1337393.5 1,899.0* 51 1/28/1998 6 inch 16 50 1,883.0 - - - MW-01 Groundwater Monitoring 55-538298 12266392.1 1337954.6 1,895.6 820 5/1/1993 6 inch 660 820 1,235.6 740 1,155.6 Originally installed at 695 ft bgs; moved to 740 ft bgs (at bottom of pump) on 3/2/2005 MW-02 Groundwater Monitoring 55-538299 12265834.6 1337667.8 1,856.0 805 5/1/1993 6 inch 630 805 1,226.0 714 1,142.0 Originally installed at 675 ft bgs; moved to 704 ft bgs (at bottom of pump) on 3/1/2005; moved to 714 ft bgs on 6/26/2009 MW-03 Groundwater Monitoring 55-216293 12266250.8 1338492.4 1,866.6 830 12/13/2007 6 inch 679 799 1,187.6 724 1,142.6 Originally installed at 777 ft bgs; moved to 724 ft bgs on 6/25/2009 MW-04 Groundwater Monitoring 55-912575 12265550.6 1337418.6 1,850.0 768 10/26/2010 6 inch 667.5 752.7 1,182.5 718 1,132.0 - MW-05 Groundwater Monitoring 55-912728 12265413.1 1336562.3 1,845.2 767 12/15/2010 6 inch 660 740.2 1,185.2 701 1,144.2 - Tuesday, November 13, 2012 Date Installed Casing Diameter Top Screen Depth (ft bgs) Bottom Screen Depth Top Screen Elevation Pump Intake Depth Pump Intake Elevation (ft bgs) (ft amsl) (ft bgs) (ft amsl) Comment Page 1 of 3 Table 2. Well Construction Summary Cave Creek Landfill, Maricopa County WellName Location Type Use ADWR ID Northing Easting TOC (ft amsl) Total Well Depth (ft) MW-06 Groundwater Monitoring 55-912942 12265265.5 1337945.3 1,860.8 776.9 5/16/2011 6 inch 683 763 1,177.8 720 1,140.8 - MW-07 Groundwater Monitoring 55-914001 12265730.9 1337907.8 1,859.7 765 2/8/2012 8.25 inch 674.8 754.8 1,184.9 718 1,141.7 - MW-08 Groundwater Monitoring 55-913859 12268813.7 1338954.8 1,889.2 766.5 1/9/2012 8.25 inch 691.5 761.5 1,197.7 736 1,153.2 - NDP-01-D Soil Vapor Monitoring - 12268409.9 1337429.5 1,902.0* 142 11/2/2004 1 inch 130 140 1,772.0 - - - NDP-01-S Soil Vapor Monitoring - 12268409.9 1337429.5 1,902.0* 142 11/2/2004 1 inch 80 90 1,822.0 - - - NDP-02-D Soil Vapor Monitoring - 12267960.5 1337410.2 1,902.0* 142 11/4/2004 1 inch 130 140 1,772.0 - - - NDP-02-S Soil Vapor Monitoring - 12267960.5 1337410.2 1,902.0* 142 11/4/2004 1 inch 80 90 1,822.0 - - - ODP-01-D Soil Vapor Monitoring - 12269714.1 1338988.7 1,903.0* 142 11/9/2004 1 inch 130 140 1,773.0 - - - ODP-01-S Soil Vapor Monitoring - 12269714.1 1338988.7 1,903.0* 142 11/9/2004 1 inch 80 90 1,823.0 - - - ODP-02-D Soil Vapor Monitoring - 12269726.2 1338440.4 1,897.0* 142 11/10/2004 1 inch 130 140 1,767.0 - - - ODP-02-S Soil Vapor Monitoring - 12269726.2 1338440.4 1,897.0* 142 11/10/2004 1 inch 80 90 1,817.0 - - - ODP-03-D Soil Vapor Monitoring - 12269132.9 1338392.7 1,892.0* 142 11/12/2004 1 inch 130 140 1,762.0 - - - ODP-03-S Soil Vapor Monitoring - 12269132.9 1338392.7 1,892.0* 142 11/12/2004 1 inch 80 90 1,812.0 - - - ODP-04-D Soil Vapor Monitoring - 12269133.2 1338927.4 1,897.0* 142 11/13/2004 1 inch 130 140 1,767.0 - - - ODP-04-S Soil Vapor Monitoring - 12269133.2 1338927.4 1,897.0* 142 11/13/2004 1 inch 80 90 1,817.0 - - - P-02-D Soil Vapor Monitoring - 12266004.1 1337644.9 1,850.2 50 4/1/1994 1 inch - - - - - - P-02-S Soil Vapor Monitoring - 12266004.1 1337644.9 1,850.2 20 4/1/1994 1 inch - - - - - - P-03 Soil Vapor Monitoring - 12265924.6 1337995.0 1,857.8 53.5 4/1/1994 1 inch - - - - - - P-05 Soil Vapor Monitoring - 12266631.4 1337882.9 1,865.0* 50 4/1/1994 1 inch - - - - - - P-06 Soil Vapor Monitoring - 12267299.4 1337997.2 1,868.0 20 4/1/1994 1 inch - - - - - - P-07 Soil Vapor Monitoring - 12267723.6 1338011.1 1,870.0 55 4/1/1994 1 inch - - - - - - P-08 Soil Vapor Monitoring - 12268038.1 1338013.6 1,867.0 20 4/1/1994 1 inch - - - - - - P-09 Soil Vapor Monitoring - 12268342.5 1338013.0 1,872.0 51 4/1/1994 1 inch - - - - - - P-10 Soil Vapor Monitoring - 12268638.2 1338017.3 1,877.0 20 4/1/1994 1 inch - - - - - - P-11 Soil Vapor Monitoring - 12269094.2 1337999.1 1,880.0* 50 4/1/1994 1 inch - - - - - - P-12 Soil Vapor Monitoring - 12269061.5 1337656.8 1,879.0* 20 4/1/1994 1 inch - - - - - - P-13-D Soil Vapor Monitoring - 12268848.5 1337563.7 1,876.0* 55 4/1/1994 1 inch - - - - - - P-13-S Soil Vapor Monitoring - 12268848.5 1337563.7 1,876.0* 20 4/1/1994 1 inch - - - - - - P-13-xD Soil Vapor Monitoring - 12268960.5 1337487.0 1,877.0* 55 9/1/1995 1 inch - - - - - - P-13-xS Soil Vapor Monitoring - 12268960.5 1337487.0 1,877.0* 30 9/1/1995 1 inch - - - - - - P-17-D Soil Vapor Monitoring - 12267841.5 1337209.9 1,882.0* 20 4/1/1994 1 inch - - - - - - P-17-S Soil Vapor Monitoring - 12267841.5 1337209.9 1,882.0* 55 4/1/1994 1 inch - - - - - - P-17-xD Soil Vapor Monitoring - 12267843.6 1337001.0 1,865.0* 55 9/1/1995 1 inch - - - - - - P-17-xS Soil Vapor Monitoring - 12267843.6 1337001.0 1,865.0* 30 9/1/1995 1 inch - - - - - - P-18-D Soil Vapor Monitoring - 12267469.2 1337201.4 1,886.0* 50 4/1/1994 1 inch - - - - - - P-18-M Soil Vapor Monitoring - 12267469.2 1337201.4 1,886.0* 20 4/1/1994 1 inch - - - - - - P-18-S Soil Vapor Monitoring - 12267469.2 1337201.4 1,886.0* 5 4/1/1994 1 inch - - - - - - P-18-xD Soil Vapor Monitoring - 12267481.4 1336982.3 1,859.4 55 9/1/1995 1 inch - - - - - - Tuesday, November 13, 2012 Date Installed Casing Diameter Top Screen Depth (ft bgs) Bottom Screen Depth Top Screen Elevation Pump Intake Depth Pump Intake Elevation (ft bgs) (ft amsl) (ft bgs) (ft amsl) Comment Page 2 of 3 Table 2. Well Construction Summary WellName Cave Creek Landfill, Maricopa County Location Type Use ADWR ID Northing Easting TOC (ft amsl) Total Well Depth (ft) Date Installed Casing Diameter Top Screen Depth (ft bgs) Bottom Screen Depth Top Screen Elevation Pump Intake Depth Pump Intake Elevation (ft bgs) (ft amsl) (ft bgs) (ft amsl) Comment P-18-xS Soil Vapor Monitoring - 12267481.4 1336982.3 1,859.4 30 9/1/1995 1 inch - - - - - - P-19-D Soil Vapor Monitoring - 12267130.9 1337180.2 1,876.0* 20 4/1/1994 1 inch - - - - - - P-19-S Soil Vapor Monitoring - 12267130.9 1337180.2 1,876.0* 55 4/1/1994 1 inch - - - - - - P-19-xD Soil Vapor Monitoring - 12267145.4 1336969.1 1,854.0* 55 9/1/1995 1 inch - - - - - - P-19-xS Soil Vapor Monitoring - 12267145.4 1336969.1 1,854.0* 30 9/1/1995 1 inch - - - - - - P-20 Soil Vapor Monitoring - 12266556.0 1337120.4 1,860.0* 50 9/1/1995 1 inch - - - - - - P-22 Soil Vapor Monitoring - 12268790.6 1337988.7 1,879.0* 50 4/1/1994 1 inch - - - - - - P-23 Soil Vapor Monitoring - 12268837.7 1337856.4 1,880.0* 20 4/1/1994 1 inch - - - - - - P-25 Soil Vapor Monitoring - 12268761.9 1337754.8 1,879.0* 55 4/1/1994 1 inch - - - - - - PW Groundwater Monitoring 55-503913 12268740.0 1337742.0 1,881.4 820 10/1/1982 8 inch 680 810 1,201.4 729 1,152.4 Originally installed at 750 ft bgs; moved to 729 ft bgs on 6/25/2009 TSSV-01-D Soil Vapor Monitoring - 12269018.5 1338002.8 1,881.0 610 1/22/2010 2 inch 549 599 1,332.0 - - - TSSV-01-M Soil Vapor Monitoring - 12269018.5 1338002.8 1,881.0 610 1/22/2010 2 inch 350 400 1,531.0 - - - TSSV-01-S Soil Vapor Monitoring - 12269018.5 1338002.8 1,881.0 610 1/22/2010 2 inch 150 200 1,731.0 - - - Notes: LFG - Landfill Gas ft - Feet ft bgs - Feet below ground surface ft amsl - Feet above mean sea level * - Casing elevation interpreted from topographic data Tuesday, November 13, 2012 Page 3 of 3 Table 3. Groundwater Elevation, Gradient, and Flow Direction Cave Creek Landfill, Maricopa County Groundwater Elevation by Well (ft amsl) MW-02 MW-03 MW-04 MW-05 MW-06 MW-07 MW-08 Flow Direction (degrees from North) PW 4/12/2001 1,205.9 - 1,176.0 - - - - - - - - 5/23/2001 1,206.4 - 1,176.0 - - - - - - - - 9/21/2001 1,206.4 - 1,198.0 - - - - - - - - 10/2/2001 1,203.4 - 1,181.0 - - - - - - - - 1/28/2002 1,199.4 - 1,181.0 - - - - - - - - 3/22/2002 1,199.4 - 1,181.0 - - - - - - - - 4/30/2002 1,199.4 - - - - - - - - - - 9/23/2002 1,195.4 - - - - - - - - - - 1/10/2003 1,195.4 - - - - - - - - - - 2/14/2003 1,195.4 - - - - - - - - - - 3/11/2003 1,195.4 - - - - - - - - - - 4/18/2003 1,195.4 1,192.6 1,186.0 - - - - - - - - 5/16/2003 1,193.4 - - - - - - - - - - 7/17/2003 1,193.4 - 1,183.0 - - - - - - - - 9/6/2003 1,193.4 - - - - - - - - - - 1/12/2004 1,193.4 - 1,183.0 - - - - - - - - 2/9/2004 1,193.4 - - - - - - - - - - 3/17/2004 1,193.4 - 1,179.5 - - - - - - - - 4/23/2004 1,193.4 - 1,179.5 - - - - - - - - 3/2/2005 1,186.3 1,178.7 1,178.4 - - - - - - - - 3/9/2005 1,188.2 1,179.0 1,176.1 - - - - - - - - 3/21/2005 1,189.1 1,181.8 1,180.7 - - - - - - - - 4/8/2005 1,190.4 1,192.8 1,190.2 - - - - - - - - 6/1/2005 1,189.4 1,179.8 1,177.7 - - - - - - - - 6/14/2005 1,185.2 1,176.6 1,174.4 - - - - - - - - 6/30/2005 1,184.2 1,176.6 1,175.5 - - - - - - - - 7/7/2005 1,184.0 1,176.5 1,175.3 - - - - - - - - 7/14/2005 1,182.9 1,176.5 1,175.3 - - - - - - - - 7/21/2005 1,186.3 1,177.9 1,176.8 - - - - - - - - 7/28/2005 1,185.8 1,178.6 1,177.3 - - - - - - - - 8/5/2005 1,190.4 1,181.4 1,180.9 - - - - - - - - 8/12/2005 1,187.2 1,181.4 1,180.8 - - - - - - - - 8/19/2005 1,187.9 1,179.7 1,177.5 - - - - - - - - Tuesday, November 13, 2012 MW-01 Gradient (feet/foot) Sample Date Page 1 of 4 Table 3. Groundwater Elevation, Gradient, and Flow Direction Cave Creek Landfill, Maricopa County Groundwater Elevation by Well (ft amsl) MW-01 MW-02 MW-03 MW-04 MW-05 MW-06 MW-07 MW-08 Gradient (feet/foot) Flow Direction (degrees from North) Sample Date PW 8/26/2005 1,190.6 1,184.0 1,182.0 - - - - - - - - 9/2/2005 1,191.5 1,185.3 1,184.4 - - - - - - - - 9/8/2005 1,194.0 1,187.0 1,184.6 - - - - - - - - 9/15/2005 1,193.9 1,187.6 1,184.7 - - - - - - - - 9/22/2005 1,195.1 1,188.6 1,185.6 - - - - - - - - 9/29/2005 1,195.6 1,189.3 1,186.2 - - - - - - - - 10/6/2005 1,195.6 1,189.5 1,186.1 - - - - - - - - 10/13/2005 1,195.7 1,189.8 1,186.4 - - - - - - - - 10/20/2005 1,183.3 1,176.0 1,174.7 - - - - - - 0.0029 101 10/27/2005 1,183.3 1,176.0 1,174.7 - - - - - - 0.0029 102 11/3/2005 1,183.3 1,176.0 1,174.8 - - - - - - 0.0030 104 11/10/2005 1,183.2 1,175.8 1,174.6 - - - - - - 0.0030 105 12/8/2005 1,183.5 1,176.7 1,175.2 - - - - - - 0.0028 262 1/12/2006 1,183.4 1,177.6 1,174.2 - - - - - - 0.0073 204 2/10/2006 1,182.5 1,175.4 1,174.0 - - - - - - 0.0028 93 3/10/2006 1,182.6 1,175.5 1,174.2 - - - - - - 0.0029 100 4/13/2006 1,182.4 1,175.2 1,173.8 - - - - - - 0.0034 115 5/9/2006 1,182.1 1,175.0 1,173.7 - - - - - - 0.0030 99 6/20/2006 1,182.3 1,175.4 1,173.5 - - - - - - 0.0032 114 7/13/2006 1,182.2 1,175.3 1,173.5 - - - - - - 0.0032 114 8/16/2006 1,181.3 1,174.6 1,172.8 - - - - - - 0.0031 114 9/19/2006 1,182.3 1,175.2 1,173.9 - - - - - - 0.0031 127 10/13/2006 1,181.4 1,174.5 1,172.4 - - - - - - 0.0036 125 11/13/2006 1,179.6 1,171.4 1,166.6 - - - - - - 0.0093 142 12/13/2006 1,180.7 1,173.9 1,171.9 - - - - - - 0.0034 120 1/18/2007 1,180.2 1,173.6 1,172.2 - - - - - - 0.0060 155 2/21/2007 1,179.8 1,173.1 1,171.3 - - - - - - 0.0061 155 3/20/2007 1,179.5 1,172.9 1,171.2 - - - - - - 0.0066 155 4/16/2007 1,179.3 1,172.7 1,170.9 - - - - - - 0.0061 155 5/22/2007 1,179.1 1,172.4 1,170.7 - - - - - - 0.0060 154 6/12/2007 1,178.7 1,172.1 1,170.3 - - - - - - 0.0060 155 7/18/2007 1,178.6 1,172.0 1,170.1 - - - - - - 0.0060 155 9/18/2007 1,177.7 - 1,169.6 - - - - - - - - Tuesday, November 13, 2012 Page 2 of 4 Table 3. Groundwater Elevation, Gradient, and Flow Direction Cave Creek Landfill, Maricopa County Groundwater Elevation by Well (ft amsl) MW-02 MW-03 MW-04 MW-05 MW-06 MW-07 MW-08 Flow Direction (degrees from North) PW 10/24/2007 1,177.5 - 1,169.2 - - - - - - - - 11/16/2007 1,177.2 - 1,168.9 - - - - - - - - 12/19/2007 1,176.8 - 1,168.6 - - - - - - - - 1/12/2008 1,175.9 - 1,168.2 - - - - - - - - 2/20/2008 1,176.3 - 1,168.2 1,169.2 - - - - - 0.0027 92 3/12/2008 1,175.4 - 1,168.2 1,170.0 - - - - - 0.0023 242 4/16/2008 1,174.9 - 1,167.5 1,169.0 - - - - - 0.0024 253 5/20/2008 1,177.1 - 1,167.9 1,168.6 - - - - - 0.0030 100 6/16/2008 1,175.9 - 1,168.0 1,167.2 - - - - - 0.0031 130 7/18/2008 1,175.7 - 1,167.0 1,168.2 - - - - - 0.0029 266 8/13/2008 1,174.3 - 1,167.1 1,167.8 - - - - - 0.0023 93 9/15/2008 1,174.6 - 1,168.4 1,168.0 - - - - - 0.0023 123 10/16/2008 1,173.8 - 1,167.0 1,167.4 - - - - - 0.0022 113 11/14/2008 1,173.8 - 1,167.0 1,167.1 - - - - - 0.0022 158 12/12/2008 1,174.6 - 1,168.0 1,167.3 - - - - - 0.0026 141 1/13/2009 1,174.4 - 1,167.5 1,166.9 - - - - - 0.0027 142 2/12/2009 1,173.2 - 1,165.8 1,166.7 - - - - - 0.0024 181 3/12/2009 1,173.6 - 1,165.6 1,167.1 - - - - - 0.0026 197 7/15/2009 1,173.1 - 1,165.2 1,167.6 - - - - - 0.0026 216 8/14/2009 1,172.6 - 1,165.0 1,163.7 - - - - - 0.0032 135 9/17/2009 1,172.8 - 1,164.8 1,165.5 - - - - - 0.0026 172 10/15/2009 1,172.6 - 1,164.6 1,165.2 - - - - - 0.0026 170 11/12/2009 1,172.6 - 1,164.6 1,165.4 - - - - - 0.0026 176 12/11/2009 1,172.7 - 1,164.4 1,165.2 - - - - - 0.0027 176 1/13/2010 1,172.2 - 1,164.4 1,166.7 - - - - - 0.0027 215 2/17/2010 1,173.5 - 1,166.0 1,167.5 - - - - - 0.0024 198 3/10/2010 1,171.7 - 1,163.9 1,164.4 - - - - - 0.0026 167 4/16/2010 1,171.5 - 1,163.7 1,164.3 - - - - - 0.0027 172 5/20/2010 1,171.6 - 1,163.6 1,164.2 - - - - - 0.0028 172 6/16/2010 1,171.6 - 1,163.9 1,164.1 - - - - - 0.0027 165 7/20/2010 1,171.7 - 1,163.3 1,164.0 - - - - - 0.0029 174 8/13/2010 1,171.7 - 1,163.3 1,164.1 - - - - - 0.0029 176 9/13/2010 1,171.6 - 1,163.5 1,163.8 - - - - - 0.0029 165 Tuesday, November 13, 2012 MW-01 Gradient (feet/foot) Sample Date Page 3 of 4 Table 3. Groundwater Elevation, Gradient, and Flow Direction Cave Creek Landfill, Maricopa County Groundwater Elevation by Well (ft amsl) MW-01 MW-02 MW-03 MW-04 MW-05 MW-06 MW-07 MW-08 Gradient (feet/foot) Flow Direction (degrees from North) Sample Date PW 10/15/2010 1,171.9 - 1,163.3 1,164.0 - - - - - 0.0029 174 11/16/2010 1,171.8 - 1,163.2 1,164.1 1,162.6 - - - - 0.0030 171 12/16/2010 1,171.8 - 1,163.3 1,164.6 1,162.6 - - - - 0.0029 180 1/11/2011 1,171.8 - 1,163.1 1,164.0 1,162.4 1,162.0 - - - 0.0030 174 2/15/2011 1,171.8 - 1,163.2 1,165.0 1,163.0 1,162.6 - - - 0.0028 180 3/9/2011 1,171.7 - 1,163.2 1,164.1 1,162.6 1,162.0 - - - 0.0029 178 4/30/2011 1,171.8 - 1,163.3 1,164.3 1,162.7 1,162.2 - - - 0.0029 176 5/26/2011 1,171.7 - 1,163.4 1,164.2 1,162.7 1,162.2 1,164.8 - - 0.0025 191 6/30/2011 1,171.3 - 1,163.2 1,164.1 1,162.5 1,165.7 1,161.3 - - 0.0034 143 7/12/2011 1,171.3 - 1,163.2 1,164.1 1,162.5 1,165.7 1,161.0 - - 0.0035 142 8/18/2011 1,171.2 - 1,163.1 1,163.9 1,162.4 1,163.0 1,160.8 - - 0.0030 163 9/16/2011 1,171.1 - 1,163.1 1,163.9 1,162.4 1,161.9 1,160.8 - - 0.0029 174 10/24/2011 1,171.0 - 1,163.1 1,165.1 1,162.3 1,162.3 1,160.6 - - 0.0028 180 11/22/2011 1,171.3 - 1,162.6 1,163.4 1,161.9 1,158.0 1,160.5 - - 0.0035 205 12/19/2011 1,171.3 - 1,162.8 1,163.2 1,162.0 1,157.9 1,160.5 - - 0.0035 204 1/30/2012 1,171.0 - 1,163.2 1,173.7 1,162.7 1,162.0 1,161.2 - - 0.0028 175 2/15/2012 1,169.8 - 1,162.9 1,164.2 1,162.5 1,162.0 1,160.8 - - 0.0025 178 3/14/2012 1,170.8 - 1,163.0 1,163.7 1,162.2 1,161.8 1,160.8 1,162.2 1,170.0 0.0027 173 4/30/2012 1,171.1 - 1,163.4 1,163.4 1,162.6 1,160.9 1,160.6 1,162.3 1,169.8 0.0027 175 5/8/2012 1,170.4 - 1,162.7 1,163.2 1,162.2 1,161.6 1,160.5 1,162.3 1,169.7 0.0026 171 6/13/2012 1,170.3 - 1,162.7 1,164.9 1,162.0 1,161.6 1,160.1 1,162.0 1,169.6 0.0026 177 7/23/2012 1,169.9 - 1,162.3 1,164.4 1,161.8 1,161.3 1,160.1 1,161.6 1,169.1 0.0026 177 8/20/2012 - - - - - 1,161.3 1,160.2 - 1,169.0 0.0025 177 8/21/2012 - - - 1,163.8 - - - 1,162.0 - 0.0025 177 8/22/2012 1,169.6 - 1,162.5 - 1,161.6 - - - - 0.0025 177 9/17/2012 1,169.3 - 1,162.0 1,162.7 1,161.4 1,160.9 1,160.7 1,162.0 1,168.4 0.0025 179 10/18/2012 1,169.0 - 1,161.9 1,162.3 1,161.1 1,160.7 1,159.5 1,160.8 1,168.1 0.0026 168 Notes: Flow direction measured in a clockwise rotation; North is 0 degrees, East is 90 degrees, South is 180 degrees, and West is 270 degrees ft amsl - Feet above mean sea level PW - Production Well MW - Monitoring Well - = data not applicable or available Tuesday, November 13, 2012 Page 4 of 4 Table 4. Groundwater TCE Data Summary Cave Creek Landfill, Maricopa County Groundwater Sampling Results by Well - TCE (µg/L) Sample Date PW MW-01 MW-02 MW-03 MW-04 MW-05 MW-06 MW-07 MW-08 9/19/1985 9.8 - - - - - - - - 9/27/1985 9.8 - - - - - - - - 10/7/1985 9.8 - - - - - - - - 11/18/1985 <1.9 - - - - - - - - 11/27/1985 <1.9 - - - - - - - - 12/6/1985 <1 - - - - - - - - 7/16/1986 <1 - - - - - - - - 8/4/1986 <1 - - - - - - - - 6/8/1987 <1 - - - - - - - - 6/10/1987 <1 - - - - - - - - 10/23/1987 <0.5 - - - - - - - - 5/25/1988 <1 - - - - - - - - 3/19/1990 <0.5 - - - - - - - - 3/21/1990 <1 - - - - - - - - 8/14/1991 <1 - - - - - - - - 11/20/1991 <1 - - - - - - - - 7/22/1992 <1 - - - - - - - - 7/31/1992 <1 - - - - - - - - 6/14/1993 - <2 <2 - - - - - - 6/22/1993 - <0.5 <0.5 - - - - - - 12/17/1997 <1 15.0 2.5 - - - - - - 5/28/1998 8.9 11.0 2.5 - - - - - - 7/28/1998 8.5 - - - - - - - - 11/17/1998 12.0 - 7.0 - - - - - - 3/26/1999 17.0 <0.5 6.3 - - - - - - 8/12/1999 22.0 2.0 34.0 - - - - - - 8/30/1999 17.0 <0.5 6.3 - - - - - - 1/19/2000 4.6 - 28.0 - - - - - - 2/25/2000 4.3 - <0.7 - - - - - - 6/19/2000 9.1 - - - - - - - - 8/18/2000 9.6 - 11.0 - - - - - - 9/22/2000 10.0 - 12.0 - - - - - - 11/22/2000 10.0 - 12.0 - - - - - - 12/6/2000 13.0 - <0.5 - - - - - - 1/19/2001 31.0 - <0.5 - - - - - - 1/22/2001 31.0 - <0.5 - - - - - - 3/7/2001 16.0 - 2.3 - - - - - - 3/27/2001 16.0 - 2.3 - - - - - - 4/12/2001 22.0 - 2.5 - - - - - - 5/23/2001 6.7 - <0.6 - - - - - - 6/1/2001 13.0 - <0.6 - - - - - - 7/20/2001 7.9 - 1.7 - - - - - - 10/2/2001 4.4 - <0.6 - - - - - - 11/27/2001 3.8 - <0.6 - - - - - - 5 5 5 5 5 5 5 AWQS Limits: 5 Tuesday, November 13, 2012 5 Page 1 of 4 Table 4. Groundwater TCE Data Summary Cave Creek Landfill, Maricopa County Groundwater Sampling Results by Well - TCE (µg/L) Sample Date PW MW-01 MW-02 MW-03 MW-04 MW-05 MW-06 MW-07 MW-08 1/28/2002 4.8 - - - - - - - - 2/1/2002 4.8 - - - - - - - - 3/1/2002 7.0 - - - - - - - - 3/22/2002 7.0 - <0.2 - - - - - - 4/1/2002 4.9 - <0.2 - - - - - - 4/30/2002 4.9 - - - - - - - - 6/1/2002 4.4 - - - - - - - - 6/3/2002 4.4 - - - - - - - - 8/1/2002 8.3 - - - - - - - - 8/7/2002 8.3 - - - - - - - - 9/1/2002 8.0 - - - - - - - - 10/1/2002 8.6 - - - - - - - - 10/21/2002 9.1 - - - - - - - - 12/1/2002 16.0 - - - - - - - - 12/4/2002 16.0 - - - - - - - - 1/1/2003 15.0 - - - - - - - - 1/10/2003 15.0 - - - - - - - - 3/1/2003 18.0 - <0.2 - - - - - - 3/11/2003 18.0 - - - - - - - - 4/1/2003 17.0 - - - - - - - - 4/18/2003 17.0 - - - - - - - - 5/1/2003 21.0 - - - - - - - - 5/16/2003 21.0 - - - - - - - - 6/1/2003 18.0 - - - - - - - - 6/13/2003 18.0 - - - - - - - - 7/1/2003 18.0 - - - - - - - - 7/17/2003 18.0 - - - - - - - - 9/16/2003 16.0 - - - - - - - - 10/1/2003 20.0 - - - - - - - - 10/24/2003 20.0 - - - - - - - - 11/1/2003 21.0 - - - - - - - - 12/1/2003 22.0 - - - - - - - - 1/1/2004 22.0 - - - - - - - - 1/12/2004 22.0 - - - - - - - - 2/1/2004 23.0 - - - - - - - - 2/9/2004 23.0 - - - - - - - - 3/1/2004 25.0 - - - - - - - - 3/17/2004 25.0 - - - - - - - - 4/1/2004 27.0 - - - - - - - - 4/23/2004 27.0 - - - - - - - - 5/1/2004 25.0 - - - - - - - - 5/27/2004 - - <0.1 - - - - - - 6/1/2004 26.0 - - - - - - - - 6/30/2004 - - <0.1 - - - - - - 5 5 5 5 5 5 5 5 5 AWQS Limits: Tuesday, November 13, 2012 Page 2 of 4 Table 4. Groundwater TCE Data Summary Cave Creek Landfill, Maricopa County Groundwater Sampling Results by Well - TCE (µg/L) Sample Date PW MW-01 MW-02 MW-03 MW-04 MW-05 MW-06 MW-07 MW-08 7/1/2004 26.0 - - - - - - - - 7/27/2004 24.0 - <0.1 - - - - - - 8/24/2004 30.0 - <2 - - - - - - 9/28/2004 23.0 - <2 - - - - - - 11/4/2004 24.0 - <2 - - - - - - 3/9/2005 3.4 5.2 <2 - - - - - - 4/8/2005 1.4 7.1 <2 - - - - - - 5/11/2005 3.0 7.4 <2 - - - - - - 7/13/2005 2.6 9.9 <2 - - - - - - 8/12/2005 7.8 10.6 <2 - - - - - - 1/12/2006 16.0 17.0 <0.5 - - - - - - 2/10/2006 44.0 17.0 <0.5 - - - - - - 4/7/2006 15.0 20.0 0.5 - - - - - - 5/9/2006 10.0 24.0 0.7 - - - - - - 6/20/2006 11.0 29.0 1.0 - - - - - - 8/16/2006 12.0 1.3 29.0 - - - - - - 9/19/2006 3.0 11.0 1.4 - - - - - - 11/17/2006 - 40.0 2.6 - - - - - - 12/13/2006 3.0 22.0 2.9 - - - - - - 2/21/2007 12.0 63.0 5.9 - - - - - - 3/20/2007 10.0 66.0 7.2 - - - - - - 4/16/2007 13.0 75.0 9.9 - - - - - - 5/22/2007 11.0 57.0 12.0 - - - - - - 6/12/2007 9.4 57.0 15.0 - - - - - - 7/18/2007 8.8 - 18.0 - - - - - - 9/18/2007 1.9 - 32.0 - - - - - - 10/24/2007 8.6 - 39.0 - - - - - - 11/16/2007 13.0 - 44.0 - - - - - - 1/22/2008 2.5 - 65.0 <0.5 - - - - - 3/12/2008 1.5 - 130.0 <0.5 - - - - - 4/17/2008 22.0 - 120.0 <0.5 - - - - - 5/20/2008 10.0 - 120.0 <0.5 - - - - - 6/16/2008 1.3 - 150.0 <0.5 - - - - - 8/13/2008 53.0 - 190.0 <0.5 - - - - - 9/15/2008 69.0 - 140.0 <0.5 - - - - - 10/16/2008 83.0 - 190.0 <0.5 - - - - - 11/14/2008 70.0 - 150.0 <0.5 - - - - - 12/12/2008 76.0 - 240.0 <0.5 - - - - - 1/13/2009 110.0 - 320.0 <0.5 - - - - - 2/12/2009 85.0 - 270.0 <0.5 - - - - - 3/12/2009 86.0 - 280.0 <0.5 - - - - - 4/10/2009 100.0 - 330.0 <0.5 - - - - - 5/12/2009 76.0 - 290.0 <0.5 - - - - - 6/9/2009 - - 190.0 - - - - - - 5 5 5 5 5 5 5 5 5 AWQS Limits: Tuesday, November 13, 2012 Page 3 of 4 Table 4. Groundwater TCE Data Summary Cave Creek Landfill, Maricopa County Groundwater Sampling Results by Well - TCE (µg/L) Sample Date PW MW-01 MW-02 MW-03 MW-04 MW-05 MW-06 MW-07 MW-08 6/9/2009 - - 150.0 - - - - - - 6/9/2009 - - 170.0 - - - - - - 6/9/2009 - - 99.0 - - - - - - 7/16/2009 2.1 - 380.0 <0.5 - - - - - 8/14/2009 6.3 - 390.0 <0.5 - - - - - 9/17/2009 3.8 - 400.0 0.9 - - - - - 10/15/2009 3.1 - 430.0 <0.5 - - - - - 11/12/2009 3.9 - 340.0 <0.5 - - - - - 12/11/2009 8.0 - 410.0 0.8 - - - - - 1/13/2010 9.3 - 400.0 <0.5 - - - - - 2/17/2010 9.5 - 410.0 <0.5 - - - - - 3/10/2010 12.0 - 340.0 0.5 - - - - - 4/16/2010 42.0 - 450.0 <0.5 - - - - - 6/16/2010 5.2 - 420.0 1.4 - - - - - 9/10/2010 38.3 - 428.0 0.7 - - - - - 11/19/2010 21.2 - 412.0 0.7 5.2 - - - - 11/24/2010 24.2 - 264.0 1.6 5.3 - - - - 3/8/2011 30.5 - 215.0 0.9 5.9 <0.5 - - - 3/30/2011 - - 303.0 - - - - - - 5/26/2011 39.6 - 315.0 1.0 4.7 <0.5 0.9 - - 8/18/2011 - - - - - <0.5 - - - 8/19/2011 58.5 - - 2.4 12.5 - 1.3 - - 8/23/2011 - - 228.0 - - - - - - 11/21/2011 - - - - - <0.5 1.8 - - 11/22/2011 464.0 - 198.0 2.6 19.9 - - - - 12/12/2011 54.5 - - - - - - - - 2/15/2012 - - - - - <0.5 2.0 - - 2/16/2012 - - - 1.5 12.9 - - - - 2/17/2012 - - - - - - - <0.5 - 2/21/2012 31.3 - 127.0 - - - - - - 2/28/2012 - - - - - - - - <0.5 4/19/2012 - - - - - - - <0.5 <0.5 5/8/2012 - - - - 18.1 - - <0.5 <0.5 5/9/2012 - - - - - <0.5 2.0 - - 5/10/2012 27.3 - 135.0 1.9 - - - - - 8/20/2012 - - - - - <5 <5 - <5 8/21/2012 - - - <5 - - - <5 - 8/22/2012 21.8 - 105.0 - 32.6 - - - - 5 5 5 5 5 5 5 AWQS Limits: 5 5 Notes: Grey text indicates a non-detected compound Bold text indicates a detected compound above the AWQS (Aquifer Water Quality Standard) µg/L - microgams per liter PW - Production Well MW - Monitoring Well - = data not applicable or available Tuesday, November 13, 2012 Page 4 of 4 Table 5. SVE Pilot Test Results - Summary of Operational Data Extraction from TSSV-1-S Cave Creek Landfill, Maricopa County Extraction from TSSV-1-M Extraction from TSSV-1-D Extraction from PW One Day Test Extended Pilot Test One Day Test Extended Pilot Test One Day Test Extended Pilot Scale Study One Day Test Extended Pilot Scale Study June 16, 2010 November 16, 2011 ‐ December 15, 2011 June 16, 2010 January 16, 2012 ‐ February 20, 2012 June 16, 2010 February 20, 2012 ‐ February 29, 2012 June 16, 2010 November 16, 2011 ‐ November 28, 2011 5.5 527 5.5 818 5.5 214 3.0 282 ‐‐‐ 203 ‐‐‐ 93.4 ‐‐‐ 55.7 ‐‐‐ 218 55 ‐ 156 160 ‐ 242 20 ‐ 62 80.5 ‐ 96.7 0 ‐ 55 46.7 ‐ 60.5 62 ‐ 190 205 ‐ 230 ‐‐‐ 6.42 ‐‐‐ 4.58 ‐‐‐ 0.715 ‐‐‐ 3.69 10 ‐ 42 79 ‐ 100 10 ‐ 56 100 10 ‐ 56 95 ‐ 100 8.6 ‐ 26 65 ‐ 85 PID Reading [ppmV] ‐‐‐ 88.7 ‐ 245.0 ‐‐‐ 108.8 ‐ 183.4 ‐‐‐ 160.1 ‐ 176.4 54 ‐ 94 37.0 ‐ 176.8 Carbon Monoxide Concentration [%] ‐‐‐ 0 ‐ 14 ‐‐‐ 2‐8 ‐‐‐ 0 ‐ 13 ‐‐‐ 0.1 ‐ 8.8 Methane Concentration [%(2)] ‐‐‐ 0 ‐ 0.05 ‐‐‐ 0 ‐ 0.25 ‐‐‐ 0.65 ‐ 2.25 ‐‐‐ 0.05 ‐ 0.35 Oxygen Concentration [%] ‐‐‐ 7.6 ‐ 10.5 ‐‐‐ 4.1 ‐ 13.1 ‐‐‐ 2.5 ‐ 17.7 ‐‐‐ 5.9 ‐ 9.6 TCE Concentration [ppmV] 6.7 ‐ 43 85 ‐ 170 20 ‐ 31 83 ‐ 140 6 ‐ 57 250 ‐ 490 19 ‐ 24 140 TCE Concentration [mg/m3] 36 ‐ 230 460 ‐ 910 110 ‐ 170 446 ‐ 753 32 ‐ 310 1,300 ‐ 2,600 100 ‐ 130 753 1,1‐DCE Concentration [ppmV] 0.073 ‐ 0.43 1.2 ‐ 2.1 ND ‐ 0.16 <2.0 0.68 ‐ 9.3 20 ‐ 66 0.68 ‐ 0.70 6.1 1,1‐DCE Concentration [mg/m3] 0.29 ‐ 1.7 4.8 ‐ 8.3 ND ‐ 0.64 <7.9 2.7 ‐ 37 79 ‐ 262 2.7 ‐ 2.8 24 PCE Concentration [ppmV] 0.18 ‐ 1.2 1.7 ‐ 4.0 0.57 ‐ 0.93 2.7 ‐ 5.4 0.47 ‐ 4.4 9.9 ‐ 35 0.93 ‐ 1.1 5.5 1.2 ‐ 7.9 12 ‐ 27 3.9 ‐ 6.3 18 ‐ 37 3.2 ‐ 30 67 ‐ 240 6.3 ‐ 7.5 37 Estimate of TCE Mass Extracted(3) [lbs] ‐‐‐ 291 ‐‐‐ 172 ‐‐‐ 87 ‐‐‐ 173 TCE Mass Extracted per Day(4) [lbs/day] ‐‐‐ 13 ‐‐‐ 5 ‐‐‐ 10 ‐‐‐ 15 Estimate of 1,1‐DCE Mass Extracted [lbs] ‐‐‐ 2.5 ‐‐‐ ‐‐‐ ‐‐‐ 7.6 ‐‐‐ 5.5 1,1‐DCE Mass Extracted per Day(4) [lbs/day] ‐‐‐ 0.11 ‐‐‐ ‐‐‐ ‐‐‐ 0.86 ‐‐‐ 0.47 ‐‐‐ 8.0 ‐‐‐ 7.5 ‐‐‐ 6.9 ‐‐‐ 8.5 ‐‐‐ 0.37 ‐‐‐ 0.22 ‐‐‐ 0.77 ‐‐‐ 0.73 Parameter Dates of Extraction Duration [hrs] Average Extraction Rate [scfm] (1) Extraction Rate [scfm ] Volume Extracted [million cf] Vacuum [inches‐water] 3 PCE Concentration [mg/m ] (3) (3) Estimate of PCE Mass Extracted [lbs] (4) PCE Mass Extracted per Day [lbs/day] Notes: (1) One‐Day Test flow rates measured as actual cubic feet per minute. '‐‐‐' = Not evaluated or applicable (2) Methane concentrations measured as a percent of the lower explosive limit for methane (i.e., 5% by volume); value presented is converted to % by volume. ppmV = parts per million by volume (3) Estimated Mass calculated from average flow rate and average VOC concentration over the duration of extraction. scfm = standard cubic feet per minute (4) Estimated Mass extracted per day calculated using the duration of extraction. ND = not detected 7/17/2012 Page 1 of 1 Table 6. SVE Pilot Test Results - Wellhead Sample Data Cave Creek Landfill, Maricopa County Sample Concentration by Compound and Units Flow Screened Interval Time [cfm] [feet bgs] 6/16/2010 10:57 AM 117 150 ‐ 200 11 4.7 <0.27 <0.083 <0.27 <0.058 0.48 0.099 <0.27 <0.044 <0.27 <0.044 0.35 0.07 <0.27 <0.066 0.29 0.07 <0.27 <0.067 <0.27 <0.077 17 5.6 1.2 0.18 44 15 36 6.7 19 2.4 <0.27 <0.1 6/16/2010 12:50 PM 55 150 ‐ 200 <10 <4.3 <1.0 <0.32 <1.0 <0.22 <1.0 <0.21 <1.0 <0.17 <1.0 <0.17 1.8 0.37 <1.0 <0.25 1.2 0.31 <1.0 <0.25 <1.0 <0.29 <10 <3.4 5.4 0.79 2.2 0.75 160 29 98 13 <1.0 <0.4 6/16/2010 2:23 PM 92 150 ‐ 200 <7.4 <3.1 <0.74 <0.23 <0.74 <0.16 <0.74 <0.15 <0.74 <0.12 <0.74 <0.12 1.6 0.32 <0.74 <0.18 1.1 0.27 <0.74 <0.19 <0.74 <0.21 <7.4 <2.5 4.9 0.72 ND ND 140 27 86 11 <0.74 <0.29 6/16/2010 4:11 PM 120 150 ‐ 200 <12 <4.8 <1.2 <0.36 <1.2 <0.25 <1.2 <0.24 <1.2 <0.19 <1.2 <0.19 2.5 0.51 <1.2 <0.28 1.7 0.4 <1.2 <0.29 <1.2 <0.33 <12 <3.9 7.9 1.2 <1.2 <0.39 230 43 140 18 <1.2 <0.45 11/8/2011 2:20 PM grab 150 ‐ 200 <24 <10 <3.2 <1.0 <4.6 <1.0 <4.9 <1.0 <6.0 <1.0 <6.0 <1.0 <9.9 <2.0 <4.1 <1.0 4.8 1.2 <4.0 <1.0 <3.5 <1.0 <12 <4.0 18 2.6 <12 <4.0 440 81 340 44 <2.6 <1.0 11/16/2011 6:05 PM ‐‐‐ 150 ‐ 200 <24 <10 <3.2 <1.0 <4.6 <1.0 <4.9 <1.0 <6.0 <1.0 <6.0 <1.0 <9.9 <2.0 <4.1 <1.0 4.8 1.2 <4.0 <1.0 <3.5 <1.0 <12 <4.0 12 1.7 <12 <4.0 460 85 390 51 <2.6 <1.0 11/23/2011 11:10 AM ‐‐‐ 150 ‐ 200 <24 <10 <3.2 <1.0 <4.6 <1.0 <4.9 <1.0 <6.0 <1.0 <6.0 <1.0 <9.9 <2.0 <4.1 <1.0 5.6 1.4 <4.0 <1.0 <3.5 <1.0 <12 <4.0 21 3.1 <12 <4.0 810 150 360 47 <2.6 <1.0 12/13/2011 1:40 PM 190 150 ‐ 200 <48 <20 <6.4 <2.0 <9.2 <2.0 <9.8 <2.0 <12 <2.0 <12 <2.0 <20 <4.0 <8.1 <2.0 8.3 2.1 <8.0 <2.0 <6.9 <2.0 <24 <8.0 27 4.0 <24 <8.0 910 170 420 55 <5.1 <2.0 TSSV‐1‐M 6/16/2010 11:01 AM 55 350 ‐ 400 8.6 3.6 <0.62 <0.19 1.0 0.22 1.3 0.26 <0.62 <0.10 <0.62 <0.10 1.0 0.20 <0.62 <0.15 <0.62 <0.16 1.2 0.29 <0.62 <0.18 14 4.6 3.9 0.57 38 13 110 20 47 6.1 <0.62 <0.24 6/16/2010 12:55 PM 20 350 ‐ 400 <5.8 <2.4 <0.58 <0.18 1.6 0.36 1.4 0.28 <0.58 <0.096 <0.58 <0.096 1.2 0.23 <0.58 <0.14 0.64 0.16 1.9 0.47 <0.58 <0.17 <5.8 <2 4.4 0.65 4.8 1.6 120 22 54 7.1 <0.58 <0.23 6/16/2010 2:29 PM 23 350 ‐ 400 <9.4 <3.9 <0.94 <0.29 2.5 0.54 1.9 0.39 <0.94 <0.16 <0.94 <0.16 1.6 0.32 <0.94 <0.23 <0.94 <0.24 2.9 0.73 <0.94 <0.27 <9.4 <3.2 6.3 0.93 1.6 0.6 170 31 75 10 <0.94 <0.13 6/16/2010 4:07 PM 43 350 ‐ 400 <9.3 <3.9 <0.93 <0.29 1.5 0.33 1.4 0.29 <0.93 <0.15 <0.93 <0.15 1.3 0.26 <0.93 <0.23 <0.93 <0.23 1.9 0.49 <0.93 <0.27 <9.3 <3.2 4.2 0.62 <0.93 <0.32 120 23 58 7.6 <0.93 <0.36 11/8/2011 2:00 PM grab 350 ‐ 400 <24 <10 <3.2 <1.0 5.1 1.1 <4.9 <1.0 <6.0 <1.0 <6.0 <1.0 <9.9 <2.0 <4.1 <1.0 <4.0 <1.0 <4.0 <1.0 <3.5 <1.0 <12 <4.0 11 1.6 <12 <4.0 279 52 123 16 <2.6 <1.0 1/16/2012 4:00 PM 83 350 ‐ 400 <48 <20 <6.4 <2.0 12 2.7 <9.8 <2.0 <12 <2.0 <12 <2.0 <20 <4.0 <8.1 <2.0 <7.9 <2.0 <8.0 <2.0 <6.9 <2.0 <24 <8.0 18 2.7 <24 <8.0 446 83 153 20 <5.1 <2.0 1/20/2012 2:21 PM 97 350 ‐ 400 <48 <20 <6.4 <2.0 26 5.6 <9.8 <2.0 12 2.0 <12 <2.0 <20 <4.0 <8.1 <2.0 <7.9 <2.0 15 3.9 <6.9 <2.0 <24 <8.0 22 3.2 <24 <8.0 510 95 168 22 <5.1 <2.0 1/31/2012 ‐‐‐ 90 350 ‐ 400 <48 <20 <6.4 <2.0 55 12.0 <9.8 <2.0 42 7.0 <12 <2.0 20 4.7 <8.1 <2.0 <7.9 <2.0 44 11 <6.9 <2.0 <24 <8.0 37 5.4 <24 <8.0 698 130 199 26 <5.1 <2.0 2/20/2012 11:11 AM 100 350 ‐ 400 <24 <10 <3.2 <1.0 46 10.0 <4.9 <1.0 26 4.4 <6.0 <1.0 <9.9 <2 <4.1 <1.0 5.6 1.4 48 12 <3.5 <1.0 <12 <4.0 28 4.1 <12 <4.0 753 140 161 21 6.0 2.2 6/16/2010 11:00 AM grab 549 ‐ 599 20 8.5 0.45 0.14 18 3.8 0.33 0.068 2.6 0.44 0.28 0.046 <0.22 <0.045 0.34 0.084 2.7 0.7 90 23 4.1 1.2 31 10 3.2 0.47 96 32 32 6.0 2.9 0.37 3.4 1.3 6/16/2010 12:53 PM grab 549 ‐ 599 <12 <4.9 <1.2 <0.37 21 4.5 <1.2 <0.24 1.9 0.32 <1.2 <0.19 <1.2 <0.24 1.4 0.36 24 6.2 230 59 15 4.4 <12 <4.0 19 2.8 4.7 1.6 200 37 17 2.2 12 4.8 6/16/2010 2:26 PM grab 549 ‐ 599 <17 <7.3 <1.7 <0.54 31 6.8 <1.7 <0.36 3.7 0.61 <1.7 <0.35 <1.7 <0.35 2.1 0.53 37 9.3 340 86 24 6.8 <17 <5.9 30 4.4 1.9 0.66 310 57 25 3.3 18 6.9 6/16/2010 4:09 PM 20 549 ‐ 599 <15 <6.4 <1.5 <0.48 25 5.3 <1.5 <0.31 2.4 0.40 <1.5 <0.25 <1.5 <0.31 1.9 0.48 34 8.5 310 77 22 6.3 <15 <5.2 26 3.9 <1.5 <0.52 270 51 23 3.0 16 6.2 11/8/2011 2:15 PM grab 549 ‐ 599 <12 <5.0 <1.6 <0.5 42 9.2 <2.4 <0.5 6.0 1.0 <3.0 <0.5 <5.0 <1.0 <2.0 <0.5 2.9 0.74 110 28 6.7 1.9 <5.9 <2.0 5.4 0.79 <5.9 <2.0 47 8.8 5.4 0.70 7.2 2.8 2/20/2012 1:28 PM 48 549 ‐ 599 <12 <5.0 <1.6 <0.5 87 19 2.9 0.60 14 2.4 <3.0 <0.5 <5.0 <1.0 3.4 0.85 79 20 1,400 340 42 12 <5.9 <2.0 67 9.9 <5.9 <2.0 1,300 250 41 5.4 33 13 2/29/2012 1:38 PM 65 549 ‐ 599 <120 <50 <16 <5.0 120 26 <2.4 <0.5 <3.0 <0.5 <30 <5.0 <50 <10 <20 <5.0 262 66 1,200 310 110 32 <59 <20 240 35 <0.59 <0.2 2,600 490 250 32 59 23 6/16/2010 6:00 PM 62 680 ‐ 823 (1) <6.2 <2.6 <0.62 <0.19 1.5 0.33 <0.62 <0.13 <0.62 <0.10 <0.62 <0.10 0.77 0.16 <0.62 <0.15 2.7 0.68 15 3.8 <0.62 <0.18 <6.2 <2.1 6.3 0.93 <0.62 <0.21 100 19 22 2.9 <0.62 <0.24 6/16/2010 6:58 PM 123 680 ‐ 823 (1) <8.5 <3.6 <0.85` <0.27 1.1 0.24 <0.85 <0.17 <0.85 <0.14 <0.85 <0.14 1.0 0.20 <0.85 <0.21 2.8 0.70 12 3.1 <0.85 <0.24 <8.5 <2.9 7.1 1.0 <0.85 <0.29 130 24 31 4.1 <0.85 <0.33 6/16/2010 8:00 PM 191 680 ‐ 823 (1) <6.3 <2.6 <0.63 <0.20 <0.63 <0.14 <0.63 <0.13 <0.63 <0.10 <0.63 <0.10 0.93 0.19 <0.63 <0.15 2.7 0.69 11 2.8 <0.63 <0.18 <6.3 <2.1 7.5 1.1 <0.63 <0.21 120 23 29 3.8 <0.63 <0.24 11/8/2011 3:27 PM grab 680 ‐ 823 (1) <11.9 <5 <1.6 <0.5 <2.3 <0.5 <2.4 <0.5 <3.0 <0.5 <3.0 <0.5 <5.0 <1.0 <2.0 <0.5 <2.0 <0.5 7.1 1.8 <1.5 <0.5 <5.9 <2.0 7.5 1.1 <5.9 <2.0 140 26 72 9.4 <1.3 <0.5 11/23/2011 10:00 AM 230 680 ‐ 823 (1) <11.9 <5 <1.6 <0.5 <915 1.8 <2.4 <0.5 <3.0 <0.5 <3.0 <0.5 <5.0 <1.0 <2.0 <0.5 24 6.1 286 72 3.0 1.0 <5.9 <2.0 37 5.5 <5.9 <2.0 752 140 11 1.4 13 5.2 Well Name Date TSSV‐1‐S TSSV‐1‐D PW Notes: (1) Methylene Acetone Benzene Chlorobenzene Chloroform 1,2-DCB 1,4-DCB Freon-12 1,1-DCA 1,1-DCE cis-1,2-DCE Chloride MEK PCE THF TCE Freon-113 Vinyl chloride 3 3 3 3 3 3 3 3 3 3 3 3 3 3 3 3 3 [mg/m ] [ppmV] [mg/m ] [ppmV] [mg/m ] [ppmV] [mg/m ] [ppmV] [mg/m ] [ppmV] [mg/m ] [ppmV] [mg/m ] [ppmV] [mg/m ] [ppmV] [mg/m ] [ppmV] [mg/m ] [ppmV] [mg/m ] [ppmV] [mg/m ] [ppmV] [mg/m ] [ppmV] [mg/m ] [ppmV] [mg/m ] [ppmV] [mg/m ] [ppmV] [mg/m ] [ppmV] Water level approximately 709‐710 feet bgs. Vertical slots at top of new screen between 680 to 762 feet bgs. bgs ‐ below ground surface cfm ‐ cubic feet per minute mg/l ‐ micrograms per liter ppmv ‐ parts per million volume ND ‐ Compound was analyzed for, but not detected above the laboratory reporting limit. 7/17/2012 DCB ‐ dichlorobenzene Freon‐12 ‐ dichlorodifuoromethane DCA ‐ dichloroethane DCE ‐ dichloroethene MEK ‐ methyl ethyl ketone PCE ‐ tetrachloroethene THF ‐ tetrahydrofuran TCE ‐ trichloroethene Freon‐113 ‐ trichlorotrifluoroethane Page 1 of 1 Table 7. SVE Pilot Test Results - Treatment Performance Data (1) Analyte Design Influent Concentrations [mg/m3](2) [ppmV] Chlorobenzene Cave Creek Landfill, Maricopa County 12/13/11 01/16/12 VOC Concentrations by Location and Date 01/31/12 02/29/12 12/13/11 01/16/12 01/16/12 Influent [ppmV] Influent [ppmV] Influent [ppmV] Influent [ppmV] Effluent [ppmV] Post Lag [ppmV] 01/31/12 02/29/12 Effluent [ppmV] Effluent [ppmV] Effluent [ppmV] Treatment System Efficiency by Date 12/13/11 1/16/12 1/31/12 2/29/12 [%] [%] [%] [%] 1.31 0.285 <2.0 2.7 12 26 <0.010 <0.10 <0.010 <0.010 0.015 ‐‐‐ >99.6% >99.9% 99.9% ‐‐‐ ‐‐‐ <2.0 <2.0 <2.0 <5.0 <0.010 <0.10 <0.010 <0.010 0.024 ‐‐‐ ‐‐‐ ‐‐‐ ‐‐‐ 0.48 0.098 <2.0 <2.0 <2.0 <5.0 <0.010 <0.10 <0.010 <0.010 <0.010 ‐‐‐ ‐‐‐ ‐‐‐ ‐‐‐ ‐‐‐ ‐‐‐ <2.0 <2.0 7.0 <5.0 <0.010 <0.10 <0.010 <0.010 <0.010 ‐‐‐ ‐‐‐ >99.9% ‐‐‐ 1.28 0.259 <4.0 <4.0 4.7 <10 1.6 4.5 3.9 0.40 1.6 ‐‐‐ ‐‐‐ 91.5% ‐‐‐ Dichlorotetrafluoroethane (F‐114) ‐‐‐ ‐‐‐ <2.0 <2.0 <2.0 <5.0 <0.010 0.21 0.14 <0.010 0.028 ‐‐‐ ‐‐‐ ‐‐‐ ‐‐‐ 1,1‐Dichloroethane ‐‐‐ ‐‐‐ <2.0 <2.0 <2.0 <5.0 <0.010 <0.10 <0.010 <0.010 <0.010 ‐‐‐ ‐‐‐ ‐‐‐ ‐‐‐ 1,1‐Dichloroethene 1.78 0.449 <2.0 <2.0 <2.0 66 <0.010 <0.10 <0.010 <0.010 <0.010 ‐‐‐ ‐‐‐ ‐‐‐ >99.8% cis‐1,2‐Dichloroethene 12.7 3.20 <2.0 <2.0 11 310 <0.010 <0.10 <0.010 <0.010 0.019 ‐‐‐ ‐‐‐ >99.9% 99.9% Methyl ethyl ketone (2‐butanone) 16.5 5.60 <8.0 <8.0 <8.0 <20 <0.040 <0.40 <0.040 <0.040 <0.040 ‐‐‐ ‐‐‐ ‐‐‐ ‐‐‐ ‐‐‐ ‐‐‐ <2.0 <2.0 <2.0 32 <0.010 <0.10 <0.010 <0.010 <0.010 ‐‐‐ ‐‐‐ ‐‐‐ >99.9% Tetrachloroethene (PCE) 5.77 0.851 2.4 2.7 5.4 35 <0.010 <0.10 <0.010 <0.010 0.011 ‐‐‐ >99.6% >99.8% 99.9% Tetrahydrofuran 23.1 7.83 <8.0 <8.0 <8.0 <20 <0.040 <0.40 <0.040 <0.040 <0.040 ‐‐‐ ‐‐‐ ‐‐‐ ‐‐‐ Trichloroethene (TCE) 132 24.5 100 83 130 490 <0.010 <0.10 <0.010 <0.010 0.076 >99.9% >99.9% >99.9% 99.9% ‐‐‐ ‐‐‐ <2.0 <2.0 <2.0 <5.0 <0.010 <0.10 0.030 <0.010 <0.010 ‐‐‐ ‐‐‐ ‐‐‐ ‐‐‐ 60.5 7.90 32 20 26 32 <0.010 1.9 1.5 <0.010 0.021 >99.9% 92.5% >99.9% 99.9% Vinyl chloride ‐‐‐ ‐‐‐ <2.0 <2.0 <2.0 23 0.062 2.6 <0.010 <0.010 1.3 ‐‐‐ ‐‐‐ ‐‐‐ 94.3% Total VOCs 255 51 134 108 196 1,014 1.7 9.2 5.6 0.40 3.1 98.8% 94.9% 99.8% 99.7% PID(3) Field Screening [ppmV] ‐‐‐ ‐‐‐ 120.6 122.5 173.9 178.1 2.3 7.9 2.7 3.7 0.5 98.1% 97.8% 97.9% 99.7% Influent Flow Rate [scfm] ‐‐‐ ‐‐‐ 290 82.5 90.2 64.5 ‐‐‐ ‐‐‐ ‐‐‐ ‐‐‐ ‐‐‐ ‐‐‐ ‐‐‐ ‐‐‐ ‐‐‐ Influent Dilution Setting [% open] ‐‐‐ ‐‐‐ 15% 0% 0% 0% ‐‐‐ ‐‐‐ ‐‐‐ ‐‐‐ ‐‐‐ ‐‐‐ ‐‐‐ ‐‐‐ ‐‐‐ Choroethane Chloroform 1,2‐Dichlorobenzene Dichlorodifluoromethane (F‐12) Methylene chloride Trichlorofluoromethane (F‐11) Trichlorotrifluoroethane (F‐113) Notes: (1) Design concentrations used to estimate preliminary carbon usages were based on data collected during the One Day Preliminary SVE Test. mg/m = milligrams per cubic meter (2) Conversion of mg/m3 to ppmV assumes 25 deg C and 1 atm. ppmV = parts per million by volume scfm = standard cubic feet per minute (3) The PID used is equipped with a 10.6 eV lamp. '‐‐‐' = Not applicable or available 3 7/17/2012 Page 1 of 1 Table 8. Domestic/Public Water Supply Wells Registered with ADWR since March 2009 within 3 Miles of Cave Creek Landfill ADWR Program Registry No. 55 218928 55 218978 55 219460 55 221177 55 911074 55 911731 55 912638 55 912707 55 912799 55 912979 55 913783 55 220996 55 911959 Owner Name City Of Phoenix Dan M Baxley Greg & Tricia Ohanessian Donald & Susan Turner Betty Clayton Michael Dixon Thomas Dempster Larry Lippon Paula Scully Charles Dixon Jack & Kim Farmer Witts, LLC George Pingitore Well Type Non‐Exempt/Service Exempt Exempt Exempt Exempt Exempt Exempt Exempt Exempt Exempt Exempt Exempt Exempt Application Approval Date 6/1/2009 5/28/2009 11/18/2009 11/28/2011 9/4/2009 3/3/2010 10/20/2010 11/15/2010 12/27/2010 2/25/2011 11/7/2011 9/21/2011 ‐ Installation Date 12/14/2009 6/15/2009 12/10/2009 ‐ 8/7/2010 ‐ 10/30/2010 ‐ ‐ 3/11/2011 ‐ ‐ ‐ Well Depth Static Water Level (feet bgs) (feet bgs) 1320 854 805 690 720 363 ‐ ‐ 510 356 700 280 1020 805 320 85 ‐ ‐ 700 340 ‐ ‐ ‐ ‐ ‐ ‐ Casing Depth Casing Diameter (feet bgs) (inches) 1320 16 800 5 720 6 ‐ ‐ 510 4 700 5 1020 5 320 6 ‐ ‐ 680 4 ‐ ‐ ‐ ‐ ‐ ‐ Cave Creek Landfill, Maricopa County Casing Type Steel ‐ Perforated Or Slotted Casing Steel ‐ Perforated Or Slotted Casing Steel ‐ Perforated Or Slotted Casing ‐ Plastic Or PVC Plastic Or PVC Steel ‐ Perforated Or Slotted Casing Plastic Or PVC ‐ Plastic Or PVC ‐ ‐ ‐ Location Cadastral UTM‐X (Meters) UTM‐Y (Meters) A05004008DCC 410350.4 3738803.0 A06003035DCD 405730.4 3742064.0 A05004021BAB 411553.6 3736989.0 A05004005AAB 410782.8 3741817.0 A05004005BBB 409572.3 3741821.0 A05004005BDA 410172.5 3741415.0 A05004029ABA 410525.9 3735383.0 A06004032CBA 409811.3 3742625.0 A06004032ACA 410617.3 3743021.0 A05004005ADA 410980.7 3741413.0 A05004021BBD 411349.6 3736788.0 A05004030CBC 407885.2 3734393.0 A05004008CCA 409743.2 3739008.0 Notes: ‐: No information available bgs: below ground surface City of Phoenix Well 55‐218928 Replaces Well 55‐524559 Exempt: A well is considered "exempt" if it has a maximum pump capacity of 35 gallons per minute; these wells are typically used to withdraw groundwater for domestic purposes, including watering less than two acres of grass or garden. Non‐Exempt: Non‐exempt wells have a pump capacity greater than 35 gallons per minute. PVC: Polyvinyl chloride 7/17/2012 Page 1 of 1 FIGURES Cave Creek Ca re free Hw y Zenith Ln Amber Sun Dr 17 § ¦ ¨ Rd k Phoenix Ca 44th Pl Bureau of Land Management Property (Approximately 40 Acres) ee St Cr d _ ^ Landfill Site ve 43 r Scottsdale ¸ ? re ek 101 ¸ ? C 51 Site Location r D rn Tr C av e Pl te Pa ee T ho Legend Estimated Boundary of Old Landfill Waste Area h 44t y Wa Dove Valley Ranch Golf Course Dov e Coy e ot h as W Estimated Boundary of New Landfill Waste Area Dr Dove Valley Ranch Community Dove Valley Ranch Golf Course Landfill Property Boundaries St l Va lley Tr Dove Valley Ranch Community Arizona State Trust Land er nT Pa lom 40th Pl Pu llm Woo dsto ck Rd an R d dR Transfer Station an g e Way aD r ert D Smokehou Notes: Cell boundaries are approximate. s e Tr l 0 125 250 500 Feet ± Additional Site Characterization Work Plan Maricopa County Cave Creek Landfill Phoenix, Arizona Dove Valley Ranch Golf Course Cell C Retention Basin Sk y y es w Pk ho Dove Valley Rd 44th St Cell B kM ac Bl Crim so Maricopa County Property (Approximately 74.7 Acres) ain nt u o nc Re Ct Ra Lined Cell 45th Cell A Path: X:\Projects\2011 Projects\1420112023\MXD\AdditionalSiteCharacterizationWP\SiteMap.mxd Carefree Sc otts dale Rd Access Road Site Map Job No. PM: Date: Scale: FIGURE 1 1420112023 NC 7/19/2012 1" = 500' The map shown here has been created with all due and reasonable care and is strictly for use with AMEC Project Number 1420112023. This map has not been certified by a licensed land surveyor, and any third party use of this map comes without warranties of any kind. AMEC assumes no liability, direct or indirect, whatsoever for any such third party or unintended use. 43 r ODP-2 d St ODP-1 ! A C re ek ! A av e { { ! A P-23 ! A C ! A GW-31 MW-08 P-22 ! A P-25 Pl Ò { P-13 PW { B te Pa ! A ODP-4 ! A ! A ! A ! TSSV-1 A ! A P-13X ODP-3 P-11 P-12 R ! P-10 GW-1 ! A ! A ! A GW-30 ! NDP-1 GW-2 A ! A ! A GW-29 ! GW-3 A ! A GW-28 ! GW-4 A ! A GW-27 ! NDP-2 GW-5 A ! A ! A GW-26 P-17X P-17 ! GW-6 ! ! A A A ! A GW-25 ! A GW-7 ! A GW-24 ! A GW-8 P-18X P-18 ! ! A GW-23 ! A A ! A GW-9 ! GW-22 A ! A GW-10 GW-11 P-19X GW-21 P-19 ! ! A A ! A ! ! A A ! A ! A ! A P-7 P-6 ! A k ac Bl M o in ta un Pk wy Ct GW-14 ky ! A ! A ! A yT rl GW-13 GW-16 GW-18 GW-19 Va lle tS ! A P-8 De s er ! A P-9 Do ve GW-12 GW-20 ! A ! A S mo rl k ehouse T im Cr so er nT MW-01 P-20 R ! ! A ! A P-5 MW-03 R ! P-2 ! R ! A MW-02 l R ! 40th P MW-05 (TB-4)* Legend MW-07 (TB-1)* MW-04 (TB-5)* R ! P-3 R ! Woo dsto ck R d Deep Soil Vapor Well ! A Landfill Soil Vapor Monitoring Well Estimated Boundary of Old Landfill Waste Area Estimated Boundary of New Landfill Waste Area Perimeter Landfill Gas Monitoring Well ! A Landfill Gas Well R ! Groundwater Monitoring Well Retention Basin { B Ò Production Well Transfer Station { { l 42nd St MW-06 (TB-2)* P nd 42 ! A R ! Desert Forest Trl ! A { Path: X:\Projects\2011 Projects\1420112023\MXD\AdditionalSiteCharacterizationWP\WellMap.mxd ! A Landfill Property Boundaries Lined Cell *Test Borings from Additional Groundwater Characterization 0 Job No. PM: Date: Scale: 1420112023 NC 9/19/2012 1" = 400' 200 ± 400 800 Feet The map shown here has been created with all due and reasonable care and is strictly for use with AMEC Project Number 1420112023. This map has not been certified by a licensed land surveyor, and any third party use of this map comes without warranties of any kind. AMEC assumes no liability, direct or indirect, whatsoever for any such third party or unintended use. Additional Site Characterization Work Plan Maricopa County Cave Creek Landfill Phoenix, Arizona Well Map FIGURE 2 1210 1205 G Groundwat ter Elevatio on (feet ab bove mean sea level) 1200 PW MW-1 MW-2 MW-3 MW-5 MW-6 MW-7 MW-8 MW-4 1195 1190 1185 1180 1175 1170 1165 1160 Date Job No.: 1420122015 Design: LM Additional Site Characterization Work Plan Maricopa County Cave Creek Landfill Phoenix, Arizona D Drawn: JP Date: 11/2012 Groundwater Elevation in Site Wells – 2001 through 2012 FIGURE 3 5/6/2013 10/18/2012 4/1/2012 9/14/2011 2/26/2011 8/10/2010 1/22/2010 7/6/2009 12/18/2008 6/1/2008 11/14/2007 4/28/2007 10/10/2006 3/24/2006 9/5/2005 2/17/2005 8/1/2004 1/14/2004 6/28/2003 12/10/2002 5/24/2002 11/5/2001 4/19/2001 10/1/2000 1155 { { { 1171 MW-08* ! R 116 9 175° 116 5 1167 116 4 1166 ! R MW-01 ! R 116 2 116 1 ! R 116 0 ! R 1164 MW-07* ! R 1162 1157.85 December 2011 ! R PW 1170.77 ! R 1170 PW 1170.44 { B Ò ! R { 1168 171° 0.0026 ft/ft 173° 0.0027 ft/ft 1167 1167 1166 1166 1165 1165 ! R 1164 MW-01 ! RMW-01 1164 ! R MW-03 1163.73 ! R 1163 ! R MW-04 1162.22 MW-02 1163.02 ! R 1161 ! R MW-06 1160.75 Groundwater Elevation Contours (Dashed where inferred) Contour Interval = 1 foot Groundwater Monitoring Well Groundwater Flow Direction (degrees) B { Groundwater Flow Gradient (ft/ft) Production Well Ò { { { Notes: * MW-07 installed on 02/08/2012 MW-08 installed on 01/09/2012 ± 0 ! R 150 300 600 Feet The map shown here has been created with all due and reasonable care and is strictly for use with AMEC Project Number 1420112023. This map has not been certified by a licensed land surveyor, and any third party use of this map comes without warranties of any kind. AMEC assumes no liability, direct or indirect, whatsoever for any such third party or unintended use. MW-04 1162.17 ! R MW-07 1162.29 ! R MW-05 1161.63 May 2012 ! R MW-03 1163.18 ! R 1162.72 MW-07 1162.17 1162 ! R MW-02 1163 MW-05 1161.8 1420112023 LM 7/10/2012 1" = 600' MW-06 1161.2 1169 1168 Legend MW-07* ! R ! R MW-08 1170.01 1169 March 2012 ! R MW-04 1162.74 { { { ! R MW-05 1162.04 MW-03 MW-02 1163.16 January 2012 MW-06 1160.46 { B Ò 1170 ! R 1163 1161.95 MW-01 ! R MW-02 1162.83 ! R MW-04 ! R MW-05 MW-03 1163.18 { 204 ° 0.0 035 ft/ft 1165 { 116 3 Path: X:\Projects\2011 Projects\1420112023\MXD\AdditionalSiteCharacterizationWP\Groundwater.mxd 0.0028 ft/ft 1168 116 6 Job No. PM: Date: Scale: MW-08* ! R 1169 116 7 ! R { B 1170 116 8 1162 PW 1171.03 Ò { PW 1171.29 Ò { B { 117 0 { 117 1 1161 Estimated Boundary of Old Landfill Waste Area Estimated Boundary of New Landfill Waste Area ! R MW-06 1160.51 Landfill Property Boundaries Retention Basin Lined Cell Transfer Station Additional Site Characterization Work Plan Maricopa County Cave Creek Landfill Phoenix, Arizona Potentiometric Surface Maps December 2011 through May 2012 FIGURE 4 MW-08 1169.73 3000 5 Monthly Precipitation Cave Creek Streamflow 4.5 2500 3.5 2000 3 1500 2.5 2 1000 1.5 1 500 0.5 0 Date Job No.: 1420112023 Design: LM Drawn: LM Date: 7/2012 Additional Site Characterization Work Plan Maricopa County Cave Creek Landfill Phoenix, Arizona Streamflow in Cave Creek and Monthly Precipitation 2005 through 2012 FIGURE 5 Apr‐12 Dec‐11 Sep‐11 Jun‐11 Feb‐11 Nov‐10 Aug‐10 May‐10 Jan‐10 Oct‐09 Jul‐09 Mar‐09 Dec‐08 Sep‐08 Jun‐08 Feb‐08 Nov‐07 Aug‐07 Apr‐07 Jan‐07 Oct‐06 Jul‐06 Mar‐06 Dec‐05 0 Monthly Prec cipitation (inches s) Discharge in Cave Cree ek (cubic feet perr second) 4 Oc 16th St ! U 550487 ! U 581726 ! U 800943 805152 611757 614063 ! U 614064! ! U 912799 U 638089 ! ! U U ! U 904129 502005 802504 804560 ! U ! U ! ! 592062 ! U 207024 595938 636555 U U 804220 ! ! ! 087362 U U U ! U 591807 586758 ! U 574144 593336 594692 ! U ! U ! U ! U 218978 474144 575703 %% ! U ! U ! U %% ) %% %% ) 912707 625151 800942 %% %% 625150 600051 514656 586678 585959 ! U ! U ! U ! ! U U 586659 592479 506269 801126 ! ! U 911074 638749 U ! U 221177 %% %% %% ) ! %% ) U ) 28th St 24th St Rd i l lo 601159 551124 ! U 905875 213291 563754 32nd St ! U ! U ot %% %% ) 530868 806013 ! U 808124 ! U ! U 614030 ! U 212904 597800 ! U ! U 599259 911731 912979 504093 %% ! %% ) U 640160 582516 800785 ! U MW-02 ! U Rd Ca ve { MW-08 ee { { ! R Cr PW { B Ò MW-01 ! R! R MW-03 MW-04 ! R R! R MW-07 ! R ! MW-05 ! R MW-06 202622 602536 k ! U ! U 634474 ! U ! U 600029 (COP #279) 206818 524559 (COP #281) (COP 9A-300) %% ! %% 520631 ) U 218928 568548 589826 (COP) ! U 807043 ! U ! U 600030 (COP #278) 203447 1 M ! U ile ! U 591811 594779 48th St (COS #65) 521546 527549 (COP #280) ! U M 587098 635121 il es ! U 598318 ! U 558341 ! U %%)%%901480 912638 ! U 603807(COP) 3 Mi le ! U ! U 800775 (COP) 538124 543024 s 638272 Ta t u m B l v d e ! U Legend Maricopa County Wells ! R Groundwater Monitoring Well { B Ò Production Well { { { Path: X:\Projects\2011 Projects\1420112023\MXD\AdditionalSiteCharacterizationWP\AdditionalSiteCharacterizationWP.mxd Ca ek ! U Cr ve ) 514327 518789 %% ! U %)% 913783 587983 40th St 2 ! U 219460 %% %% 56th St ! U ! U 213666 Landfill Property Boundaries Average Direction of Groundwater Flow Wells 55 Pre-2009 ! U Domestic-Exempt (<35 GPM) ! U Non-Exempt (>35 GPM) Wells 55 Post-2009 H a p p y Va l l e y R d 0 Job No. PM: Date: Scale: 1420112023 NC 7/17/2012 1" = 4000' 2,000 ± 4,000 8,000 Feet The map shown here has been created with a ll du e and reasona ble ca re and is strictly for use with AMEC Project Numbe r 14 20112023 . This ma p h as not be en cer tified by a licen sed la nd sur veyor, an d a ny third party u se of this ma p comes withou t warranties of any kin d. AMEC assu me s no liabi lity, direct or indi rect, wha tsoever fo r a ny such third pa rty or unintend ed use . %% %% ) Domestic-Exempt (<35 GPM) %% %% Non-Exempt (>35 GPM) ) Additional Site Characterization Work Plan Maricopa County Cave Creek Landfill Phoenix, Arizona Select ADWR Registered Wells within a 3-Mile Radius of Cave Creek Landfill FIGURE 6 Notes: COP = City of Phoenix COS = City of Scottsdale GPM = Gallons Per Minute Stock Exempt Wells are not presented 2500 COP 55-524559 COP 55-527549 COP 55-600029 COP 55 55-600030 600030 COP 55 55-603807 603807 COS 55 55-518789 518789 Annualy Pumpage A e (Acre Feet/yearr) 2000 1500 1000 500 Pumpage Year Job No.: 1420112023 Design: LM Drawn: LM Date: 7/2012 Additional Site Characterization Work Plan Maricopa County Cave Creek Landfill Phoenix, Arizona Annual Groundwater Pumpage in COP and COS Wells near CCL FIGURE 7 2010 2009 2008 2007 2006 2005 2004 2003 2002 2001 2000 1999 1998 1997 1996 1995 1994 1993 1992 1991 1990 1989 1988 1987 1986 1985 1984 0 43 r ODP-2 d ODP-1 ! A St P-23 GW-31 GW-1 ! R ! ! A A GW-2 NDP-1 ! A ! A ! P-9 A GW-29 ! A ! GW-3 A ! A GW-28 ! GW-4 A ! P-8 A GW-27 ! A ! NDP-2 GW-5 A ! ! GW-26A A P-17X P-17 ! GW-6 ! ! A A A ! P-7 A GW-25 ! ! A GW-7 A ! GW-24 A ! A GW-8 P-18X P-18 ! ! ! GW-23 A A A ! A GW-9 P-6 ! GW-22 A ! A ! A GW-10 GW-11 P-19X P-19 GW-21 ! GW-13 ! ! ! A A ! A A A ! A GW-12 GW-20 GW-14 ! A ! ! A A GW-16 GW-18 GW-19 ! A ! A ! A GW-30 Do k ac Bl A' MW-08 M ve ou Va lle ain nt y Tr l w Pk y Ct ! ! P-25 A P-22 A ! P-10 A ky { { B A ! A De se av e { C Pl Ò A! { P-13 ! A ! A te Pa PW ! A ODP-4 ! A BA ! TSSV-1 ! A P-13X ODP-3 P-11 P-12 rt S C re ek ! A S m o kehouse Trl Cr im er nT MW-01 ! A so P-20 P-5 ! R ! A C' ! R MW-03 P-2 MW-05 ! R MW-07 ! R k Rd Lines of Cross Section Job No. PM: Date: Scale: 1420112023 NC 7/19/2012 1" = 500' 250 ± 500 1,000 Feet The map shown here has been created with all due and reasonable care and is strictly for use with AMEC Project Number 1420112023. This map has not been certified by a licensed land surveyor, and any third party use of this map comes without warranties of any kind. AMEC assumes no liability, direct or indirect, whatsoever for any such third party or unintended use. ! A Deep Soil Vapor Well ! A Landfill Soil Vapor Monitoring Well Estimated Boundary of Old Landfill Waste Area Estimated Boundary of New Landfill Waste Area Landfill Property Boundaries ! A Perimeter Landfill Gas Monitoring Well ! A Landfill Gas Well Retention Basin ! R Groundwater Monitoring Well Transfer Station { B Ò Production Well { { 40th St Desert Forest Trl 0 l dP Legend MW-06 n 42 ! R stoc 42nd St B' Woo d { Path: X:\Projects\2011 Projects\1420112023\MXD\AdditionalSiteCharacterizationWP\CrossSections.mxd C MW-04 P-3 40th ! R ! A Pl ! ! R MW-02 A Additional Site Characterization Work Plan Maricopa County Cave Creek Landfill Phoenix, Arizona Lines of Cross Section FIGURE 8 Lined Cell 1210 450 1205 400 1200 1195 350 1190 300 1185 250 1180 200 1175 150 1170 100 1165 50 1160 0 1155 Groundwater Elevaon [feet amsl] TCE Concentraon [μg/L] PW 500 Pa P te Groundwater Elevaon { B Ò { { { l TCE PW MW-08 ! R 1210 450 1205 Dov e C e av C Va 350 1200 lle y 1195 T rl TCE Concentraon [μg/L] 400 1190 300 1185 250 1180 200 1175 150 1170 100 1205 400 1200 1195 350 1190 300 1185 250 1180 200 1170 100 1165 50 1160 0 1155 ac Bl kM ou nt ain wy Pk De se r t Sm o k e house Trl ! R MW-01 MW-03 ! R Groundwater Elevaon ! R MW-02 MW-03 Pu 500 llm ! R 1195 1190 Wo 250 od s to c 1185 kR d 100 1175 l 150 1180 dP 200 n 42 ! R 300 1200 42nd St MW-06 350 1205 Rd 4 0th P ! R 400 TCE Concentraon [μg/L] ! R MW-05 MW-07 l 450 MW-04 1210 an 1170 1165 50 1205 400 1200 1195 350 1190 300 1185 250 1180 200 1175 150 1170 1165 50 1160 0 1155 TCE Lone s Private 40th St 100 TCE Groundwater Elevaon Sierra ! R { { Job No. PM: Date: Scale: 1420112023 NC 7/10/2012 1" = 500' 250 ± 500 1,000 Feet The map shown here has been created with all due and reasonable care and is strictly for use with AMEC Project Number 1420112023. This map has not been certified by a licensed land surveyor, and any third party use of this map comes without warranties of any kind. AMEC assumes no liability, direct or indirect, whatsoever for any such third party or unintended use. Groundwater Elevaon Trl S u ns et Trl Legend { B Ò 0 o me 1155 41st Way 1210 450 Groundwater Elevaon [feet amsl] TCE Concentraon [μg/L] 500 { Path: X:\Projects\2011 Projects\1420112023\MXD\AdditionalSiteCharacterizationWP\Trends.mxd MW-04 1160 Desert Forest Trl 43rd St 0 Groundwater Elevaon [feet amsl] TCE C ri m Groundwater Elevaon er nT 1175 150 Groundwater Elevaon [feet amsl] TCE t 450 1155 yC 1210 1160 0 Sk 500 50 so TCE Concentraon [μg/L] MW-02 1165 Groundwater Elevaon [feet amsl] re ek MW-01 500 Groundwater Monitoring Well Landfill Property Boundaries Ashler Hills Dr Production Well Lined Cell Estimated Boundary of Old Landfill Waste Area Retention Basin Estimated Boundary of New Landfill Waste Area Transfer Station Additional Site Characterization Work Plan Maricopa County Cave Creek Landfill Phoenix, Arizona TCE Concentration Trends in Groundwater FIGURE 11 d St Cr k ac Bl M ou ve Va lle ain nt yT rl w Pk µg/L y Ct { Do ky { { ! R MW-08 <0.5 µg/L er tS C PW 27.3 µg/L Pl { B Ò te Pa av e C re ek 43 r im De s S mo rl k ehouse T so er nT Pu llm ! R Wo o dsto ck R d ± 800 Feet The map shown here has been created with all due and reasonable care and is strictly for use with AMEC Project Number 1420112023. This map has not been certified by a licensed land surveyor, and any third party use of this map comes without warranties of any kind. AMEC assumes no liability, direct or indirect, whatsoever for any such third party or unintended use. Landfill Property Boundaries { B Ò Production Well Lined Cell Estimated TCE Contour 5 µg/L Retention Basin Estimated Boundary of Old Landfill Waste Area Transfer Station l dP 1420112023 NC 7/10/2012 1" = 400' 400 Groundwater Monitoring Well 42nd St Job No. PM: Date: Scale: 200 ! R n 42 MW-06 2.0 µg/L Desert Forest Trl 0 Rd Legend MW-07 <0.5 µg/L ! R an { MW-04 18.1 µg/L 40 t h ! R ! R MW-05 <0.5 µg/L MW-02 135.0 µg/L Pl ! R ! R MW-03 1.9 µg/L { Path: X:\Projects\2011 Projects\1420112023\MXD\AdditionalSiteCharacterizationWP\TCE_Impacted_GW.mxd 5µg / L MW-01 { ! R Estimated Boundary of New Landfill Waste Area Notes: µg/L - micrograms per liter. 1.9 µg/L - Trichloroethene concentrations in groundwater from May 8 to May 10, 2012. Additional Site Characterization Work Plan Maricopa County Cave Creek Landfill Phoenix, Arizona Estimated Extent of TCE - Impacted Groundwater FIGURE 12 Landfill Cover Recharge Outside of Cover Waste VOC-Impacted Landfill Gas Increases in Concentration with Depth Infiltration from surface water runoff following precipitation events > 600 Feet Below Ground Surface (Depth To Groundwater Increasing Over Time) Increasing Consolidation of Alluvium Unlined Landfill Area Gas Phase Diffusion Particle of water will travel laterally as well as vertically. Residual Leachate Deposited Prior To Installing Cover Vadose Zone Capillary Fringe Saturated Zone Direction of Groundwater Flow PW MW-2 GENERALIZED DEPICTION - NOT TO SCALE Job No. PM: Date: Scale: 1420112023 NC 6/28/2012 NTS The map shown here has been created with all due and reasonable care and is strictly for use with AMEC Project Number 1420112023. This map has not been certified by a licensed land surveyor, and any third party use of this map comes without warranties of any kind. AMEC assumes no liability, direct or indirect, whatsoever for any such third party or unintended use. Additional Site Characterization Work Plan Maricopa County Cave Creek Landfill Phoenix, Arizona Conceptual Site Model FIGURE 13 d St te Pa av e C re ek 43 r { { C { TSSV-5 TSSV-4 Do ve TSSV-3 k ac Bl M o Pk wy Ct in ta un ky { { { yT rl tS { B Ò Va lle De s er { { { { B Ò { { { B Ò TSSV-2 { { B Ò Pl ! TSSV-1 A S mo rl k ehouse T im Cr so nR d 40th P ck R d Deep Soil Vapor Well ! A Landfill Soil Vapor Monitoring Well Groundwater Monitoring Well { B Ò Production Well l 42nd St Desert Forest Trl R ! { ! A l Future Deep Soil Vapor Well Location { { B Ò { { Woo dsto P nd 42 { Legend { Path: X:\Projects\2012 Projects\1420122015 Cave Creek Landfill FY2013\MXD\WorkPlan_Future_DSV_Wells_Figure14.mxd er nT Pu llm a ! A Perimeter Landfill Gas Monitoring Well ! A Landfill Gas Well Estimated Boundary of Old Landfill Waste Area Estimated Boundary of New Landfill Waste Area Lined Cell Retention Basin 0 Job No. PM: Date: Scale: 1420122015 NC 11/19/2012 1" = 400' 200 ± 400 800 Feet The map shown here has been created with all due and reasonable care and is strictly for use with AMEC Project Number 1420112023. This map has not been certified by a licensed land surveyor, and any third party use of this map comes without warranties of any kind. AMEC assumes no liability, direct or indirect, whatsoever for any such third party or unintended use. Additional Site Characterization Work Plan Maricopa County Cave Creek Landfill Phoenix, Arizona Planned Locations of Future Soil Vapor Monitoring Wells FIGURE 14 APPENDIX A BORING LOGS TEST DRILLING EQUIPMENT AND PROCEDURES Description of Subsurface Exploration Methods Auger Boring Drilling through overburden soils is performed with 6 5/8-inch O.D., 3 1/4-inch I.D. hollow stem auger or 4 1/2-inch solid stem continuous flight auger. Carbide insert teeth are normally used on bits so they can penetrate soft rock or very strongly cemented soils. A CME-75 truck-mounted drill rig is used to advance the auger. The drill rigs are powered with six-cylinder Cummins diesel engines capable of delivering about 11.4 kN-m torque to the drill spindle. The spindle is advanced with twin hydraulic rams capable of exerting 90 kN (20,000 pounds) downward force. Generally, refusal to penetration of the auger is adopted as top of the SGC or “river-run” material or harder bedrock, which require other techniques for penetration. Grab samples or auger cuttings may be taken as necessary. Standard penetration tests or 2.42-inch diameter ring samples are taken in conjunction with the auger borings as needed, with the sampling interval and type being indicated on the boring logs. Hammer Drill Drilling with the Hammer drill is accomplished with a Drill Systems AP-1000 drill rig advancing a double-walled drive casing with a link-belt 180 diesel pile driving hammer, having a rated energy of 8,100 foot-pounds per blow. Where noted on the boring log, the hammer is equipped with a supercharger which can boost the energy to approximately 12,000 foot-pounds per blow. The supercharger is used only in portions of the boring where blow counts are relatively high. Cuttings are removed with compressed air by a reverse circulation process, and are collected in a cyclone from which grab samples are obtained. The drive casing is either 9-inch O.D. by 6-inch I.D. or 6 5/8-inch O.D. by 4-inch I.D. and employs an expendable bit of slightly larger diameter than the O.D. of the casing. Hammer blows required to advance the drive casing are recorded in 1-foot increments, as noted on the boring logs. Standard penetration tests or 2.42-inch diameter ring samples taken are noted on the boring logs. Core Boring Rock core samples are retrieved using a CME-75 drill rig, SAITECH GH 3 rig or Burley 2500, 4500 or 4000. The GH 3 is a portable hydraulic core drill. The GH 3 is powered by a Kohler two-cylinder 25-horsepower engine. The hydraulics motor which feeds a two-speed transmission and powers the BW spindle. This unit has a 3-foot stroke and is hand-fed with a 2,000 pound pushpull capability. The GH 3 has the capability of drilling with either B- or N-size core steel using standard or wireline systems. N-size core is the preferred size and it has a nominal O.D. of about 2 inches. The Burley 2500 and 4500 series are portable hydraulic core drills. The 4500 series is capable of a track-mounted or skid-type chassis. The Burley 2500 and 4500 series are powered by 44 and 75 HP power units, respectively, provide up to 2,000 foot-pounds (ft.-lbs.) of torque and in excess of 1,000 revolutions per minute (RPM) of spindle speed. Both rigs are capable of retrieving either N- or H-sized core using wireline systems. The N-size core has a nominal O.D. of about 2 inches and the H-size of about 2.4 inches. The Burley 4000 is a track-mounted core drill. The CME-75 utilizes a wireline core drilling system that takes N-size cores. Using the NQ wireline system, core is recovered quickly by retrieving the core-laden inner tube through the drill string. TEST DRILLING EQUIPMENT AND PROCEDURES (Cont.) Sampling Procedures Dynamically driven tube samples are usually obtained at selected intervals in the borings by the ASTM D1586 test procedure. In many cases, 2-inch O.D., 1 3/8-inch I.D. samples are used to obtain the standard penetration resistance. “Undisturbed” samples of firmer soils are often obtained with 3-inch O.D. samples lined with 2.42-inch I.D. brass rings. The driving energy is generally recorded as the number of blows of a 140-pound, 30-inch free fall drop hammer required to advance the samples in 6-inch increments. However, in stratified soils, driving resistance is sometimes recorded in 2- or 3-inch increments so that soil changes and the presence of scattered gravel or cemented layers can be readily detected and the realistic penetration values obtained for consideration in design. These values are expressed in blows per 6 inches on the boring logs. "Undisturbed" sampling of softer soils is sometimes performed with thin walled Shelby tubes (ASTM D1587), pitcher samplers, Denison samplers or continuous CME samplers. Where samples of rock are required, they are obtained by NQ diamond core drilling (ASTM D2113). Tube samples are labeled and placed in watertight containers to maintain field moisture contents for testing. When necessary for testing, larger bulk samples are taken from auger cuttings. Also, representative samples are obtained from the cuttings from the hammer and Schramm drill rig. Boring Records Drilling operations are directed by our field engineer or geologist who examines soil recovery and prepares the boring logs. Soils are visually classified in accordance with the Unified Soil Classification System (ASTM D2487), with appropriate group symbols being shown on the boring logs. TERMINOLOGY USED TO DESCRIBE THE RELATIVE DENSITY, CONSISTENCY OR FIRMNESS OF SOILS The terminology used on the boring logs to describe the relative density, consistency or firmness of soils relative to the standard penetration resistance is presented below. The standard penetration resistance (N) in blows per foot is obtained by the ASTM D1586 procedure using 2" O.D., 1 3/8" I.D. samplers. 1. Relative Density. Terms for description of relative density of cohesionless, uncemented sands and sand-gravel mixtures. Relative Density N 0-4 5-10 11-30 31-50 50+ 2. Relative Consistency. Terms for description of clays which are saturated or near saturation. N 3. Very loose Loose Medium dense Dense Very dense Relative Consistency 0-2 3-4 5-8 Very soft Soft Medium stiff 9-15 Stiff 16-30 30+ Very stiff Hard Remarks Easily penetrated several inches with fist. Easily penetrated several inches with thumb. Can be penetrated several inches with thumb with moderate effort. Readily indented with thumb, but penetrated only with great effort. Readily indented with thumbnail. Indented only with difficulty by thumbnail. Relative Firmness. Terms for description of partially saturated and/or cemented soils which commonly occur in the Southwest including clays, cemented granular materials, silts and silty and clayey granular soils. N 0-4 5-8 9-15 16-30 31-50 50+ Relative Firmness Very soft Soft Moderately firm Firm Very firm Hard PROJECT Cave Creek Landfill Groundwater Investigation 0 5 10 Unified Soil Classification or Rock Unit Sample Type Sample Graphical Log 1.4 11-2-10 to 11-6-10 Sample Identification DATE 14-2010-2022 Drill Rate Min/ft. Depth in Feet JOB NO. LOCATION SE of Landfill (moved 45' WSW) RIG TYPE BORING TYPE T-3 Atlas CopCo Reverse Air Rotary 5 1/2" O.D. Pilot DATUM Ground Surface REMARKS SP-SM note: adding water for dust control from 0 to 20' A VISUAL CLASSIFICATION POORLY GRADED SAND WITH SILT & GRAVEL, few fines, some fine to coarse grained, angular to subangular gravel, mostly medium to coarse grained, subangular sand, nonplastic, dark gray to black 0.6 1.8 A 2.4 A note: slight increase in coarse grained gravel below 10' 15 20 SP note: adding hydrogel to water to stabilize borehole from 20' to 640' 25 30 POORLY GRADED SAND WITH GRAVEL, some to mostly fine to coarse grained, angular to subangular gravel, mostly medium to coarse grained, subangular sand, nonplastic, dark red to black A 35 40 1.7 A 45 50 GROUNDWATER DEPTH(ft) HOUR 695.00 0930 DATE 11-6-10 SAMPLE TYPE LOG OF TEST BORING NO. Continuous Soil Core Examined Samples Consist of 2 - 8oz Glass Jars 1 - 40ml Amber VOA - Methonal Extraction TB-1 Page 1 of 15 PROJECT Cave Creek Landfill Groundwater Investigation Unified Soil Classification or Rock Unit Sample Type Sample Graphical Log 50 11-2-10 to 11-6-10 Sample Identification DATE 14-2010-2022 Drill Rate Min/ft. Depth in Feet JOB NO. LOCATION SE of Landfill (moved 45' WSW) RIG TYPE BORING TYPE T-3 Atlas CopCo Reverse Air Rotary 5 1/2" O.D. Pilot DATUM Ground Surface REMARKS SP A VISUAL CLASSIFICATION POORLY GRADED SAND WITH GRAVEL, continued 55 60 A 65 70 A 75 80 85 90 95 0.4 note: dark red, green, & black below approximately 80' A 0.8 0.8 SP-SM A POORLY GRADED SAND WITH SILT & GRAVEL, few fines, some fine to coarse grained, angular to subangular gravel, mostly medium to coarse grained, angular to subangular sand, nonplastic, black 1.0 100 note: decrease in gravel & increase in fines below approximately 95' GROUNDWATER DEPTH(ft) HOUR 695.00 0930 DATE 11-6-10 SAMPLE TYPE LOG OF TEST BORING NO. Continuous Soil Core Examined Samples Consist of 2 - 8oz Glass Jars 1 - 40ml Amber VOA - Methonal Extraction TB-1 Page 2 of 15 PROJECT Cave Creek Landfill Groundwater Investigation 100 Unified Soil Classification or Rock Unit Sample Type Sample Graphical Log 0.8 11-2-10 to 11-6-10 Sample Identification DATE 14-2010-2022 Drill Rate Min/ft. Depth in Feet JOB NO. LOCATION SE of Landfill (moved 45' WSW) RIG TYPE BORING TYPE T-3 Atlas CopCo Reverse Air Rotary 5 1/2" O.D. Pilot DATUM Ground Surface REMARKS SP-SM A VISUAL CLASSIFICATION POORLY GRADED SAND WITH SILT & GRAVEL, continued note: dark gray to black from 100' to 109' 105 110 115 1.0 note: dark green to black below 109' 0.6 A 0.8 120 125 130 135 140 145 A 0.6 0.6 A 0.6 SP 0.4 POORLY GRADED SAND WITH GRAVEL, some to mostly fine to coarse grained, subangular to angular gravel, mostly medium to coarse grained, angular to subangular sand, nonplastic, dark green to black A 0.8 150 GROUNDWATER DEPTH(ft) HOUR 695.00 0930 DATE 11-6-10 SAMPLE TYPE LOG OF TEST BORING NO. Continuous Soil Core Examined Samples Consist of 2 - 8oz Glass Jars 1 - 40ml Amber VOA - Methonal Extraction TB-1 Page 3 of 15 PROJECT Cave Creek Landfill Groundwater Investigation 150 Unified Soil Classification or Rock Unit Sample Type Sample Graphical Log 0.8 11-2-10 to 11-6-10 Sample Identification DATE 14-2010-2022 Drill Rate Min/ft. Depth in Feet JOB NO. LOCATION SE of Landfill (moved 45' WSW) RIG TYPE BORING TYPE T-3 Atlas CopCo Reverse Air Rotary 5 1/2" O.D. Pilot DATUM Ground Surface REMARKS SP A VISUAL CLASSIFICATION POORLY GRADED SAND WITH GRAVEL, continued note: slight decrease in coarse grained gravel below approximately 155' 155 160 165 170 175 180 185 190 195 0.6 0.6 A 0.8 0.8 note: gray to dark gray below approximately 170' A 1.0 1.0 A SP-SM POORLY GRADED SAND WITH SILT & GRAVEL, few fines, some fine grained, angular to subangular gravel, mostly medium to coarse grained, subangular to angular sand, nonplastic, dark green to black SM SILTY SAND WITH GRAVEL, little fines, little to some fine grained, angular to subangular gravel, mostly fine to coarse grained, angular to subangular sand, nonplastic, dark green to black 0.4 0.6 A 0.6 200 GROUNDWATER DEPTH(ft) HOUR 695.00 0930 DATE 11-6-10 SAMPLE TYPE LOG OF TEST BORING NO. Continuous Soil Core Examined Samples Consist of 2 - 8oz Glass Jars 1 - 40ml Amber VOA - Methonal Extraction TB-1 Page 4 of 15 PROJECT Cave Creek Landfill Groundwater Investigation 210 215 220 225 230 235 240 245 Unified Soil Classification or Rock Unit 11-2-10 to 11-6-10 Sample Identification Sample Type Sample Graphical Log 200 205 DATE 14-2010-2022 Drill Rate Min/ft. Depth in Feet JOB NO. SE of Landfill (moved 45' WSW) RIG TYPE BORING TYPE T-3 Atlas CopCo Reverse Air Rotary 5 1/2" O.D. Pilot DATUM Ground Surface REMARKS SM A 0.8 1.0 LOCATION VISUAL CLASSIFICATION SILTY SAND WITH GRAVEL, continued SP-SM POORLY GRADED SAND WITH SILT & GRAVEL, few fines, little to some fine grained, angular to subangular gravel, mostly medium to coarse grained, angular to subangular sand, nonplastic, dark green to dark gray SP POORLY GRADED SAND WITH GRAVEL, trace fines, some fine to coarse grained, angular to subangular gravel, mostly medium to coarse grained, angular to subangular sand, nonplastic, dark green to dark gray A 0.8 0.6 A note: decrease in gravel & dark green to black below 224' 1.0 0.8 A 0.8 0.4 A 1.0 250 GROUNDWATER DEPTH(ft) HOUR 695.00 0930 DATE 11-6-10 SAMPLE TYPE LOG OF TEST BORING NO. Continuous Soil Core Examined Samples Consist of 2 - 8oz Glass Jars 1 - 40ml Amber VOA - Methonal Extraction TB-1 Page 5 of 15 PROJECT Cave Creek Landfill Groundwater Investigation 250 Unified Soil Classification or Rock Unit Sample Type Sample Graphical Log 0.8 11-2-10 to 11-6-10 Sample Identification DATE 14-2010-2022 Drill Rate Min/ft. Depth in Feet JOB NO. LOCATION SE of Landfill (moved 45' WSW) RIG TYPE BORING TYPE T-3 Atlas CopCo Reverse Air Rotary 5 1/2" O.D. Pilot DATUM Ground Surface REMARKS SP A VISUAL CLASSIFICATION POORLY GRADED SAND WITH GRAVEL, continued note: dark gray to black from 260' to 279' 255 260 265 270 0.6 1.0 A 0.8 0.8 A 1.0 A 275 280 285 290 295 note: dark gray & green from 279' to 324' 0.8 1.2 A 1.4 300 GROUNDWATER DEPTH(ft) HOUR 695.00 0930 DATE 11-6-10 SAMPLE TYPE LOG OF TEST BORING NO. Continuous Soil Core Examined Samples Consist of 2 - 8oz Glass Jars 1 - 40ml Amber VOA - Methonal Extraction TB-1 Page 6 of 15 PROJECT Cave Creek Landfill Groundwater Investigation 300 305 310 315 320 325 330 335 340 345 Unified Soil Classification or Rock Unit Sample Type Sample Graphical Log 1.2 11-2-10 to 11-6-10 Sample Identification DATE 14-2010-2022 Drill Rate Min/ft. Depth in Feet JOB NO. LOCATION SE of Landfill (moved 45' WSW) RIG TYPE BORING TYPE T-3 Atlas CopCo Reverse Air Rotary 5 1/2" O.D. Pilot DATUM Ground Surface REMARKS SP A VISUAL CLASSIFICATION POORLY GRADED SAND WITH GRAVEL, continued 1.0 1.2 A 0.8 1.0 A SP-SM POORLY GRADED SAND WITH SILT & GRAVEL, few fines, some fine grained, angular to subangular gravel, mostly medium to coarse grained, angular to subangular sand, nonplastic, dark gray 0.8 1.0 A 1.2 1.0 A 0.8 350 GROUNDWATER DEPTH(ft) HOUR 695.00 0930 DATE 11-6-10 SAMPLE TYPE LOG OF TEST BORING NO. Continuous Soil Core Examined Samples Consist of 2 - 8oz Glass Jars 1 - 40ml Amber VOA - Methonal Extraction TB-1 Page 7 of 15 PROJECT Cave Creek Landfill Groundwater Investigation 350 355 360 365 370 375 380 385 390 395 Unified Soil Classification or Rock Unit Sample Type Sample Graphical Log 1.0 11-2-10 to 11-6-10 Sample Identification DATE 14-2010-2022 Drill Rate Min/ft. Depth in Feet JOB NO. LOCATION SE of Landfill (moved 45' WSW) RIG TYPE BORING TYPE T-3 Atlas CopCo Reverse Air Rotary 5 1/2" O.D. Pilot DATUM Ground Surface REMARKS SP-SM A VISUAL CLASSIFICATION POORLY GRADED SAND WITH SILT & GRAVEL, continued 1.4 0.8 A 1.4 1.0 A 1.4 1.4 A 0.8 note: some to mostly fine to coarse grained gravel below 385' 1.2 A 1.6 400 GROUNDWATER DEPTH(ft) HOUR 695.00 0930 DATE 11-6-10 SAMPLE TYPE LOG OF TEST BORING NO. Continuous Soil Core Examined Samples Consist of 2 - 8oz Glass Jars 1 - 40ml Amber VOA - Methonal Extraction TB-1 Page 8 of 15 PROJECT Cave Creek Landfill Groundwater Investigation 400 405 410 415 430 435 440 445 Unified Soil Classification or Rock Unit 11-2-10 to 11-6-10 Sample Identification Sample Type Sample Graphical Log 1.2 LOCATION SE of Landfill (moved 45' WSW) RIG TYPE BORING TYPE T-3 Atlas CopCo Reverse Air Rotary 5 1/2" O.D. Pilot DATUM Ground Surface REMARKS SP-SM A VISUAL CLASSIFICATION POORLY GRADED SAND WITH SILT & GRAVEL, few fines, little fine grained, angular to subangular gravel, mostly medium to coarse grained, angular to subangular sand, nonplastic, dark gray 1.2 1.0 A 1.6 420 425 DATE 14-2010-2022 Drill Rate Min/ft. Depth in Feet JOB NO. SP A POORLY GRADED SAND WITH GRAVEL, trace fines, some to mostly fine to coarse grained, angular to subangular gravel, mostly medium to coarse grained, angular to subangular sand, nonplastic, dark gray 0.6 0.8 A 0.6 1.0 A 0.8 450 GROUNDWATER DEPTH(ft) HOUR 695.00 0930 DATE 11-6-10 SAMPLE TYPE LOG OF TEST BORING NO. Continuous Soil Core Examined Samples Consist of 2 - 8oz Glass Jars 1 - 40ml Amber VOA - Methonal Extraction TB-1 Page 9 of 15 PROJECT Cave Creek Landfill Groundwater Investigation 450 455 460 465 470 Unified Soil Classification or Rock Unit Sample Type Sample Graphical Log 0.8 11-2-10 to 11-6-10 Sample Identification DATE 14-2010-2022 Drill Rate Min/ft. Depth in Feet JOB NO. LOCATION SE of Landfill (moved 45' WSW) RIG TYPE BORING TYPE T-3 Atlas CopCo Reverse Air Rotary 5 1/2" O.D. Pilot DATUM Ground Surface REMARKS SP A VISUAL CLASSIFICATION POORLY GRADED SAND WITH GRAVEL, continued 1.0 1.2 note: reddish-brown to dark gray from 460' to 470' A 1.0 0.9 A 1.4 A 475 480 485 490 note: decrease in gravel from 480' to 490' 0.8 0.9 A 495 note: changing to 5 1/2" tricone bit at 500' 500 GROUNDWATER DEPTH(ft) HOUR 695.00 0930 DATE 11-6-10 SAMPLE TYPE LOG OF TEST BORING NO. Continuous Soil Core Examined Samples Consist of 2 - 8oz Glass Jars 1 - 40ml Amber VOA - Methonal Extraction TB-1 Page 10 of 15 PROJECT Cave Creek Landfill Groundwater Investigation 500 505 Unified Soil Classification or Rock Unit Sample Type Sample Graphical Log 1.2 11-2-10 to 11-6-10 Sample Identification DATE 14-2010-2022 Drill Rate Min/ft. Depth in Feet JOB NO. LOCATION SE of Landfill (moved 45' WSW) RIG TYPE BORING TYPE T-3 Atlas CopCo Reverse Air Rotary 5 1/2" O.D. Pilot DATUM Ground Surface REMARKS SP A VISUAL CLASSIFICATION POORLY GRADED SAND WITH GRAVEL, continued 0.9 note: dark gray to black from 504' to 520' 510 515 A 1.4 520 525 530 535 A SP POORLY GRADED SAND WITH GRAVEL, some to mostly fine to coarse grained, angular to subangular gravel, mostly medium to coarse grained, angular to subangular sand, nonplastic, dark gray to black GP POORLY GRADED GRAVEL WITH SAND, some to mostly medium to coarse grained, angular to subangular sand, mostly fine to coarse grained, angular to subangular gravel, nonplastic, dark gray to black 2.4 1.4 A note: rig chatter from 538' to 540'; possible cobbles & boulders present 1.7 2.0 540 545 1.4 A 2.2 550 GROUNDWATER DEPTH(ft) HOUR 695.00 0930 DATE 11-6-10 SAMPLE TYPE LOG OF TEST BORING NO. Continuous Soil Core Examined Samples Consist of 2 - 8oz Glass Jars 1 - 40ml Amber VOA - Methonal Extraction TB-1 Page 11 of 15 PROJECT Cave Creek Landfill Groundwater Investigation 550 Unified Soil Classification or Rock Unit Sample Type Sample Graphical Log 1.0 11-2-10 to 11-6-10 Sample Identification DATE 14-2010-2022 Drill Rate Min/ft. Depth in Feet JOB NO. LOCATION SE of Landfill (moved 45' WSW) RIG TYPE BORING TYPE T-3 Atlas CopCo Reverse Air Rotary 5 1/2" O.D. Pilot DATUM Ground Surface REMARKS GP A VISUAL CLASSIFICATION POORLY GRADED GRAVEL WITH SAND, continued 555 2.0 560 565 570 575 1.6 note: had to trip out of borehole; drill pipes were tightening up at 558' A note: rig chatter, possible cobbles & boulders present from 564' to 570' 1.4 1.8 note: increase in medium to coarse grained, angular to subangular sand below 570'; possible poorly graded sand with gravel A 3.3 1.5 580 1.2 note: tripping out borehole to loosen drill pipe at 585' A 585 590 SM SILTY SAND WITH GRAVEL, little fines, little to some fine to coarse grained, angular to subangular gravel, mostly medium to coarse grained, angular to subangular sand, nonplastic, dark gray GP POORLY GRADED GRAVEL WITH SAND A 595 0.5 600 GROUNDWATER DEPTH(ft) HOUR 695.00 0930 DATE 11-6-10 SAMPLE TYPE LOG OF TEST BORING NO. Continuous Soil Core Examined Samples Consist of 2 - 8oz Glass Jars 1 - 40ml Amber VOA - Methonal Extraction TB-1 Page 12 of 15 PROJECT Cave Creek Landfill Groundwater Investigation 600 605 610 Unified Soil Classification or Rock Unit Sample Type Sample Graphical Log 1.2 11-2-10 to 11-6-10 Sample Identification DATE 14-2010-2022 Drill Rate Min/ft. Depth in Feet JOB NO. LOCATION SE of Landfill (moved 45' WSW) RIG TYPE BORING TYPE T-3 Atlas CopCo Reverse Air Rotary 5 1/2" O.D. Pilot DATUM Ground Surface REMARKS GP A VISUAL CLASSIFICATION POORLY GRADED GRAVEL WITH SAND, some medium to coarse grained, angular to subangular sand, mostly fine to coarse grained, angular to subangular gravel, nonplastic, dark gray 0.8 1.1 A 615 620 625 630 635 1.4 note: tripping out of borehole to loosen drill pipe at 618' A 1.0 0.8 A 2.3 note: rig chatter, possible cobbles & boulders present from 635' to 638' 1.3 640 note: stopped drilling with mud from 640' to 718' for clean water sample 645 650 note: rig chatter, possible cobbles & boulders present from 645' to 650' GROUNDWATER DEPTH(ft) HOUR 695.00 0930 DATE 11-6-10 SAMPLE TYPE LOG OF TEST BORING NO. Continuous Soil Core Examined Samples Consist of 2 - 8oz Glass Jars 1 - 40ml Amber VOA - Methonal Extraction TB-1 Page 13 of 15 PROJECT Cave Creek Landfill Groundwater Investigation 650 Unified Soil Classification or Rock Unit Sample Type Sample Graphical Log 0.8 11-2-10 to 11-6-10 Sample Identification DATE 14-2010-2022 Drill Rate Min/ft. Depth in Feet JOB NO. LOCATION SE of Landfill (moved 45' WSW) RIG TYPE BORING TYPE T-3 Atlas CopCo Reverse Air Rotary 5 1/2" O.D. Pilot DATUM Ground Surface REMARKS GP A VISUAL CLASSIFICATION POORLY GRADED GRAVEL WITH SAND, continued 655 A 660 665 GP-GM POORLY GRADED GRAVEL WITH SILT & SAND, few silt, some medium to coarse grained, subangular to angular sand, mostly fine to coarse grained, angular to subangular gravel, nonplastic, gray A 670 note: increase in fines from 665' to 680' 675 note: decrease in fines below 680' A 680 GP POORLY GRADED GRAVEL WITH SAND, trace silt, little to some fine to coarse grained, subangular to angular sand, mostly fine grained, subangular to angular gravel, nonplastic, grayish-brown 685 A 690 695 note: collected ground water sample: TB1-718-110610 at 12:30 on 11-6-10 A 700 GROUNDWATER DEPTH(ft) HOUR 695.00 0930 DATE 11-6-10 SAMPLE TYPE LOG OF TEST BORING NO. Continuous Soil Core Examined Samples Consist of 2 - 8oz Glass Jars 1 - 40ml Amber VOA - Methonal Extraction TB-1 Page 14 of 15 PROJECT Cave Creek Landfill Groundwater Investigation Unified Soil Classification or Rock Unit Sample Type Sample Graphical Log 11-2-10 to 11-6-10 Sample Identification DATE 14-2010-2022 Drill Rate Min/ft. Depth in Feet JOB NO. 700 LOCATION SE of Landfill (moved 45' WSW) RIG TYPE BORING TYPE T-3 Atlas CopCo Reverse Air Rotary 5 1/2" O.D. Pilot DATUM Ground Surface REMARKS GP VISUAL CLASSIFICATION POORLY GRADED GRAVEL WITH SAND, continued note: increase silt below 705' 705 GP-GM POORLY GRADED GRAVEL WITH SILT & SAND, trace cobbles, few silt, little fine to coarse grained, subangular to angular sand, mostly fine grained, subangular to angular gravel, nonplastic, grayish-brown A 710 note: rig chatter, possible boulders present below 708' 715 Total Depth = 718' Stopped 5 1/2" percussion hammer at 500' Drilled 5 1/2" tricone from 500' to 718' Stopped 5 1/2" tricone at 718' 720 725 730 735 740 745 750 GROUNDWATER DEPTH(ft) HOUR 695.00 0930 DATE 11-6-10 SAMPLE TYPE LOG OF TEST BORING NO. Continuous Soil Core Examined Samples Consist of 2 - 8oz Glass Jars 1 - 40ml Amber VOA - Methonal Extraction TB-1 Page 15 of 15 PROJECT Cave Creek Landfill Groundwater Investigation Unified Soil Classification or Rock Unit Sample Type Sample Graphical Log 0 4-1-11 to 4-30-11 Sample Identification DATE 14-2010-2022 Drill Rate Min/ft. Depth in Feet JOB NO. SP A 5 10 LOCATION RIG TYPE BORING TYPE VERSA Drill SN-1097 5 1/2" O.D. Pilot; 11 5/8" O.D. Tricone Bit DATUM REMARKS VISUAL CLASSIFICATION note: adding water from 0' to 665' in pilot hole; using mud during over reaming POORLY GRADED SAND WITH GRAVEL, few fine grained sand, some fine to coarse grained gravel, mostly medium to coarse grained sand, nonplastic, tan to light brown note: 14" conductor casing installed using 20" drill bit from 0 to 20' note: increase in coarse gravel at 20', possible GP A 15 20 A 25 30 A note: black, red & green at 30' A note: increase in gravel, possible GP from 40' to 50' 35 40 45 50 note: increase in medium grained sand at 50' GROUNDWATER DEPTH(ft) HOUR 695.80 11:22 DATE 4-7-11 SAMPLE TYPE LOG OF TEST BORING NO. Continuous Soil Core Examined Samples Consist of 2 - 8oz Glass Jars 1 - 40ml Amber VOA - Methonal Extraction TB-2 Page 1 of 16 PROJECT Cave Creek Landfill Groundwater Investigation Unified Soil Classification or Rock Unit Sample Type Sample Graphical Log 50 4-1-11 to 4-30-11 Sample Identification DATE 14-2010-2022 Drill Rate Min/ft. Depth in Feet JOB NO. LOCATION RIG TYPE BORING TYPE DATUM REMARKS SP A VERSA Drill SN-1097 5 1/2" O.D. Pilot; 11 5/8" O.D. Tricone Bit VISUAL CLASSIFICATION POORLY GRADED SAND WITH GRAVEL, continued 55 60 A note: increase in coarse grained gravel at 60' A note: increase in medium to coarse grained sand at 70' 65 70 75 80 A 85 90 A 95 note: increase in coarse grained gravel at 100' 100 GROUNDWATER DEPTH(ft) HOUR 695.80 11:22 DATE 4-7-11 SAMPLE TYPE LOG OF TEST BORING NO. Continuous Soil Core Examined Samples Consist of 2 - 8oz Glass Jars 1 - 40ml Amber VOA - Methonal Extraction TB-2 Page 2 of 16 PROJECT Cave Creek Landfill Groundwater Investigation Unified Soil Classification or Rock Unit Sample Type Sample Graphical Log 100 4-1-11 to 4-30-11 Sample Identification DATE 14-2010-2022 Drill Rate Min/ft. Depth in Feet JOB NO. LOCATION RIG TYPE BORING TYPE VERSA Drill SN-1097 5 1/2" O.D. Pilot; 11 5/8" O.D. Tricone Bit DATUM REMARKS VISUAL CLASSIFICATION A SP POORLY GRADED SAND WITH GRAVEL, continued A SP POORLY GRADED SAND, mostly medium to coarse grained sand, angular to subangular, nonplastic, black, green & tan A GP POORLY GRADED GRAVEL WITH SAND, little coarse grained sand, mostly coarse grained gravel, angular to subangular, black, green and red A SP POORLY GRADED SAND, trace fine grained sand, trace fine grained gravel, angular to subangular, mostly medium to coarse grained sand, black, green, red & tan 105 110 115 120 125 130 135 140 A 145 150 GROUNDWATER DEPTH(ft) HOUR 695.80 11:22 DATE 4-7-11 SAMPLE TYPE LOG OF TEST BORING NO. Continuous Soil Core Examined Samples Consist of 2 - 8oz Glass Jars 1 - 40ml Amber VOA - Methonal Extraction TB-2 Page 3 of 16 PROJECT Cave Creek Landfill Groundwater Investigation Unified Soil Classification or Rock Unit Sample Type Sample Graphical Log 150 4-1-11 to 4-30-11 Sample Identification DATE 14-2010-2022 Drill Rate Min/ft. Depth in Feet JOB NO. LOCATION RIG TYPE BORING TYPE DATUM REMARKS SP A VERSA Drill SN-1097 5 1/2" O.D. Pilot; 11 5/8" O.D. Tricone Bit VISUAL CLASSIFICATION POORLY GRADED SAND, continued note: few gravel & dark brown, black, red, green & tan 155 160 A 165 170 note: increase in fine grained gravel, medium brown at 170', possible poorly graded sand with gravel A 175 180 A 185 190 note: increase in fine grained gravel at 190'; possible poorly graded sand with gravel A 195 200 GROUNDWATER DEPTH(ft) HOUR 695.80 11:22 DATE 4-7-11 SAMPLE TYPE LOG OF TEST BORING NO. Continuous Soil Core Examined Samples Consist of 2 - 8oz Glass Jars 1 - 40ml Amber VOA - Methonal Extraction TB-2 Page 4 of 16 PROJECT Cave Creek Landfill Groundwater Investigation Unified Soil Classification or Rock Unit Sample Type Sample Graphical Log 200 4-1-11 to 4-30-11 Sample Identification DATE 14-2010-2022 Drill Rate Min/ft. Depth in Feet JOB NO. LOCATION RIG TYPE BORING TYPE DATUM REMARKS SP-SM A VERSA Drill SN-1097 5 1/2" O.D. Pilot; 11 5/8" O.D. Tricone Bit VISUAL CLASSIFICATION POORLY GRADED SAND WITH SILT AND GRAVEL, few silt, few to little subangular to angular gravel, mostly fine to medium grained sand, nonplastic, brown 205 210 A 215 220 A note: increase in fine grained sand at 220' A note: increase in coarse to medium grained sand at 230' 225 230 235 240 A 245 250 GROUNDWATER DEPTH(ft) HOUR 695.80 11:22 DATE 4-7-11 SAMPLE TYPE LOG OF TEST BORING NO. Continuous Soil Core Examined Samples Consist of 2 - 8oz Glass Jars 1 - 40ml Amber VOA - Methonal Extraction TB-2 Page 5 of 16 PROJECT Cave Creek Landfill Groundwater Investigation Unified Soil Classification or Rock Unit Sample Type Sample Graphical Log 250 4-1-11 to 4-30-11 Sample Identification DATE 14-2010-2022 Drill Rate Min/ft. Depth in Feet JOB NO. A SP A SP-SM LOCATION RIG TYPE BORING TYPE VERSA Drill SN-1097 5 1/2" O.D. Pilot; 11 5/8" O.D. Tricone Bit DATUM REMARKS VISUAL CLASSIFICATION POORLY GRADED SAND, trace fines, mostly medium to coarse grained sand, angular to subangular, nonplastic, tan, green & orange 255 260 POORLY GRADED SAND WITH SILT, few silt, mostly medium to coarse grained sand, angular to subangular, nonplastic, brown, black, tan, orange & green 265 270 A 275 280 A 285 290 note: trace gravel at 290' A 295 300 GROUNDWATER DEPTH(ft) HOUR 695.80 11:22 DATE 4-7-11 SAMPLE TYPE LOG OF TEST BORING NO. Continuous Soil Core Examined Samples Consist of 2 - 8oz Glass Jars 1 - 40ml Amber VOA - Methonal Extraction TB-2 Page 6 of 16 PROJECT Cave Creek Landfill Groundwater Investigation Unified Soil Classification or Rock Unit Sample Type Sample Graphical Log 300 4-1-11 to 4-30-11 Sample Identification DATE 14-2010-2022 Drill Rate Min/ft. Depth in Feet JOB NO. LOCATION RIG TYPE BORING TYPE DATUM REMARKS SP-SM A VERSA Drill SN-1097 5 1/2" O.D. Pilot; 11 5/8" O.D. Tricone Bit VISUAL CLASSIFICATION POORLY GRADED SAND WITH SILT, few silt, mostly medium to coarse grained sand, angular to subangular, nonplastic, brown, black & orange 305 310 A note: few fine grained gravel at 310' A note: increase in fines at 320' A note: decrease in fines at 330' 315 320 325 330 335 SP 340 POORLY GRADED SAND, trace fines, mostly medium to coarse grianed sand, angular to subangular, nonplastic, brown, black & orange A 345 350 GROUNDWATER DEPTH(ft) HOUR 695.80 11:22 DATE 4-7-11 SAMPLE TYPE LOG OF TEST BORING NO. Continuous Soil Core Examined Samples Consist of 2 - 8oz Glass Jars 1 - 40ml Amber VOA - Methonal Extraction TB-2 Page 7 of 16 PROJECT Cave Creek Landfill Groundwater Investigation Unified Soil Classification or Rock Unit Sample Type Sample Graphical Log 350 4-1-11 to 4-30-11 Sample Identification DATE 14-2010-2022 Drill Rate Min/ft. Depth in Feet JOB NO. LOCATION RIG TYPE BORING TYPE VERSA Drill SN-1097 5 1/2" O.D. Pilot; 11 5/8" O.D. Tricone Bit DATUM REMARKS VISUAL CLASSIFICATION A SP-SM POORLY GRADED SAND WITH SILT, few silt, mostly medium to coarse grained sand, subangular to angular, nonplastic, brown A SP POORLY GRADED SAND, trace fines, mostly medium to coarse grained sand, angular to subangular, nonplastic, brown A SP-SM 355 360 365 370 POORLY GRADED SAND WITH SILT, few silt, mostly medium to coarse grained sand, angular to subangular, nonplastic, brown 375 380 note: increase in coarse grained sand at 380' A 385 390 SP A POORLY GRADED SAND, trace fines, mostly medium to coarse grained sand, angular to subangular, nonplastic, black, brown, green & orange 395 400 GROUNDWATER DEPTH(ft) HOUR 695.80 11:22 DATE 4-7-11 SAMPLE TYPE LOG OF TEST BORING NO. Continuous Soil Core Examined Samples Consist of 2 - 8oz Glass Jars 1 - 40ml Amber VOA - Methonal Extraction TB-2 Page 8 of 16 PROJECT Cave Creek Landfill Groundwater Investigation Unified Soil Classification or Rock Unit Sample Type Sample Graphical Log 400 4-1-11 to 4-30-11 Sample Identification DATE 14-2010-2022 Drill Rate Min/ft. Depth in Feet JOB NO. LOCATION RIG TYPE BORING TYPE DATUM REMARKS SP A VERSA Drill SN-1097 5 1/2" O.D. Pilot; 11 5/8" O.D. Tricone Bit VISUAL CLASSIFICATION POORLY GRADED SAND, continued 405 410 A 415 420 A 425 430 note: increased in fines at 430' A 435 440 SP A POORLY GRADED SAND WITH GRAVEL, few fine grained gravel, angular to subangular, mostly medium to coarse grained sand, nonplastic, black, brown, green & orange 445 450 GROUNDWATER DEPTH(ft) HOUR 695.80 11:22 DATE 4-7-11 SAMPLE TYPE LOG OF TEST BORING NO. Continuous Soil Core Examined Samples Consist of 2 - 8oz Glass Jars 1 - 40ml Amber VOA - Methonal Extraction TB-2 Page 9 of 16 PROJECT Cave Creek Landfill Groundwater Investigation Unified Soil Classification or Rock Unit Sample Type Sample Graphical Log 450 4-1-11 to 4-30-11 Sample Identification DATE 14-2010-2022 Drill Rate Min/ft. Depth in Feet JOB NO. LOCATION RIG TYPE BORING TYPE DATUM REMARKS SP A VERSA Drill SN-1097 5 1/2" O.D. Pilot; 11 5/8" O.D. Tricone Bit VISUAL CLASSIFICATION POORLY GRADED SAND WITH GRAVEL, continued note: trace fines below 450' 455 460 A 465 470 SP A POORLY GRADED SAND, trace fine grained gravel & fine sand, mostly medium to coarse grained sand, angular to subangular, nonplastic, black, brown, green & orange 475 480 A 485 490 A 495 500 GROUNDWATER DEPTH(ft) HOUR 695.80 11:22 DATE 4-7-11 SAMPLE TYPE LOG OF TEST BORING NO. Continuous Soil Core Examined Samples Consist of 2 - 8oz Glass Jars 1 - 40ml Amber VOA - Methonal Extraction TB-2 Page 10 of 16 PROJECT Cave Creek Landfill Groundwater Investigation Unified Soil Classification or Rock Unit Sample Type Sample Graphical Log 500 4-1-11 to 4-30-11 Sample Identification DATE 14-2010-2022 Drill Rate Min/ft. Depth in Feet JOB NO. LOCATION RIG TYPE BORING TYPE DATUM REMARKS SP A VERSA Drill SN-1097 5 1/2" O.D. Pilot; 11 5/8" O.D. Tricone Bit VISUAL CLASSIFICATION POORLY GRADED SAND, continued 505 510 A 515 520 A 525 530 A 535 540 note: decrease in fine grained sand at 540' A 545 note: increase in fine grained sand at 550' 550 GROUNDWATER DEPTH(ft) HOUR 695.80 11:22 DATE 4-7-11 SAMPLE TYPE LOG OF TEST BORING NO. Continuous Soil Core Examined Samples Consist of 2 - 8oz Glass Jars 1 - 40ml Amber VOA - Methonal Extraction TB-2 Page 11 of 16 PROJECT Cave Creek Landfill Groundwater Investigation Unified Soil Classification or Rock Unit Sample Type Sample Graphical Log 550 4-1-11 to 4-30-11 Sample Identification DATE 14-2010-2022 Drill Rate Min/ft. Depth in Feet JOB NO. A LOCATION RIG TYPE BORING TYPE VERSA Drill SN-1097 5 1/2" O.D. Pilot; 11 5/8" O.D. Tricone Bit DATUM REMARKS VISUAL CLASSIFICATION SP POORLY GRADED SAND, continued SM SILTY SAND WITH GRAVEL, little fine to coarse gravel, subangular to angular, mostly medium grained to coarse grained sand, subangular to angular, uncemented to weakly cemented, minimal reaction with HCL, nonplastic, light brown to brown 555 560 A 565 570 A 575 580 A 585 590 A 595 600 GROUNDWATER DEPTH(ft) HOUR 695.80 11:22 DATE 4-7-11 SAMPLE TYPE LOG OF TEST BORING NO. Continuous Soil Core Examined Samples Consist of 2 - 8oz Glass Jars 1 - 40ml Amber VOA - Methonal Extraction TB-2 Page 12 of 16 PROJECT Cave Creek Landfill Groundwater Investigation Unified Soil Classification or Rock Unit Sample Type Sample Graphical Log 600 4-1-11 to 4-30-11 Sample Identification DATE 14-2010-2022 Drill Rate Min/ft. Depth in Feet JOB NO. LOCATION RIG TYPE BORING TYPE DATUM REMARKS SM A VERSA Drill SN-1097 5 1/2" O.D. Pilot; 11 5/8" O.D. Tricone Bit VISUAL CLASSIFICATION SILTY SAND WITH GRAVEL, continued 605 610 A 615 620 A 625 note: caving below 625' 630 A note: increase in coarse grained gravel & trace cobbles from 630' to 640' A note: added back side mud between 620' to 660' 635 640 645 650 GROUNDWATER DEPTH(ft) HOUR 695.80 11:22 DATE 4-7-11 SAMPLE TYPE LOG OF TEST BORING NO. Continuous Soil Core Examined Samples Consist of 2 - 8oz Glass Jars 1 - 40ml Amber VOA - Methonal Extraction TB-2 Page 13 of 16 PROJECT Cave Creek Landfill Groundwater Investigation Unified Soil Classification or Rock Unit Sample Type Sample Graphical Log 650 4-1-11 to 4-30-11 Sample Identification DATE 14-2010-2022 Drill Rate Min/ft. Depth in Feet JOB NO. LOCATION RIG TYPE BORING TYPE DATUM REMARKS SM A VERSA Drill SN-1097 5 1/2" O.D. Pilot; 11 5/8" O.D. Tricone Bit VISUAL CLASSIFICATION SILTY SAND WITH GRAVEL, continued 655 660 note: hole caving without use of water, very dusty in cyclone; observed silty sand with gravels, light brown to brown A note: increasing gravels below ~660' to ~675' 665 670 note: at 665' tried to drill dry per work plan, but had to add water for dust control measures; used mud during over reaming through entire borehole A 675 680 A 685 690 A 695 700 GROUNDWATER DEPTH(ft) HOUR 695.80 11:22 DATE 4-7-11 SAMPLE TYPE LOG OF TEST BORING NO. Continuous Soil Core Examined Samples Consist of 2 - 8oz Glass Jars 1 - 40ml Amber VOA - Methonal Extraction TB-2 Page 14 of 16 PROJECT Cave Creek Landfill Groundwater Investigation Unified Soil Classification or Rock Unit Sample Type Sample Graphical Log 700 4-1-11 to 4-30-11 Sample Identification DATE 14-2010-2022 Drill Rate Min/ft. Depth in Feet JOB NO. LOCATION RIG TYPE BORING TYPE DATUM REMARKS SM A VERSA Drill SN-1097 5 1/2" O.D. Pilot; 11 5/8" O.D. Tricone Bit VISUAL CLASSIFICATION SILTY SAND WITH GRAVEL, continued 705 710 A 715 720 A 725 SP-SM 730 POORLY GRADED SAND WITH SILT, few silt, mostly fine grained sand, subangular to angular, nonplastic, grayish brown to light brown A 735 740 note: increasing grain sizes below ~745' A 745 750 SM GROUNDWATER DEPTH(ft) HOUR 695.80 SILTY SAND WITH GRAVEL, little to some fine gravel, subangular to angular, some to mostly fine to coarse grained sand, subangular to angular, nonplastic, grayish-brown 11:22 DATE 4-7-11 SAMPLE TYPE LOG OF TEST BORING NO. Continuous Soil Core Examined Samples Consist of 2 - 8oz Glass Jars 1 - 40ml Amber VOA - Methonal Extraction TB-2 Page 15 of 16 PROJECT Cave Creek Landfill Groundwater Investigation Unified Soil Classification or Rock Unit Sample Type Sample Graphical Log 750 4-1-11 to 4-30-11 Sample Identification DATE 14-2010-2022 Drill Rate Min/ft. Depth in Feet JOB NO. LOCATION RIG TYPE BORING TYPE DATUM REMARKS SM A VERSA Drill SN-1097 5 1/2" O.D. Pilot; 11 5/8" O.D. Tricone Bit VISUAL CLASSIFICATION SILTY SAND WITH GRAVEL, continued 755 760 A 765 SW-SM WELL GRADED SAND WITH SILT & GRAVEL, few silt, little to some fine grained gravel, subangular to angular, some to mostly fine to coarse grained sand, subangular to angular, nonplastic, grayish brown 770 775 Total depth = 776'11" Stopped 5 1/2" O.D. pilot hole at 720' Stopped 11 5/8" tricone at 777' 780 note: downhole geophysics conducted by Southwest Exploration on 5-1-11 785 790 795 800 GROUNDWATER DEPTH(ft) HOUR 695.80 11:22 DATE 4-7-11 SAMPLE TYPE LOG OF TEST BORING NO. Continuous Soil Core Examined Samples Consist of 2 - 8oz Glass Jars 1 - 40ml Amber VOA - Methonal Extraction TB-2 Page 16 of 16 PROJECT Cave Creek Landfill Groundwater Investigation 0 Unified Soil Classification or Rock Unit Sample Type Sample Graphical Log 1.0 11-10-10 to 12-10-10 Sample Identification DATE 14-2010-2022 Drill Rate Min/ft. Depth in Feet JOB NO. GM A 5 LOCATION 50' from stake, SWC of landfill RIG TYPE BORING TYPE T-3 Atlas CopCo 5 1/2" O.D. Pilot; 12 1/4" O.D. Tricone Bit DATUM Ground Surface REMARKS VISUAL CLASSIFICATION note: adding water for dust control from 0 to 80' in pilot hole; using mud during over reaming SILTY GRAVEL WITH SAND, little to some silt, little to some fine to coarse grained, subangular to angular sand, some to mostly fine to coarse grained, subangular to angular gravel, nonplastic, light brown note: cobbles present note: weakly cemented zones GP-GM A 10 POORLY GRADED GRAVEL WITH SILT & SAND, few silt, little to some fine to coarse grained, subangular to angular sand, some to mostly fine to coarse grained, subangular to angular gravel, nonplastic, brown note: decrease fines below 9' 15 20 1.0 GP A POORLY GRADED GRAVEL WITH SAND, little to some coarse grained, subangular sand, some to mostly coarse grained, subangular to subrounded gravel, nonplastic, dark gray note: boulders up to 16" in diameter & cobbles present 25 30 A 35 40 1.2 note: switch to stratex to drive down temporary casing to 44'; switch back to downhole hammer at 40' A 45 50 GROUNDWATER DEPTH(ft) HOUR 681.40 note: heavy rig chatter during 12 1/4" tricone over reaming from 40' to 42' 0850 DATE 11-17-10 SAMPLE TYPE LOG OF TEST BORING NO. Continuous Soil Core Examined Samples Consist of 2 - 8oz Glass Jars 1 - 40ml Amber VOA - Methonal Extraction TB-4 Page 1 of 16 PROJECT Cave Creek Landfill Groundwater Investigation Unified Soil Classification or Rock Unit Sample Type Sample Graphical Log 50 11-10-10 to 12-10-10 Sample Identification DATE 14-2010-2022 Drill Rate Min/ft. Depth in Feet JOB NO. LOCATION 50' from stake, SWC of landfill RIG TYPE BORING TYPE T-3 Atlas CopCo 5 1/2" O.D. Pilot; 12 1/4" O.D. Tricone Bit DATUM Ground Surface REMARKS GP A POORLY GRADED GRAVEL WITH SAND, continued 55 note: heavy rig chatter during 12 1/4" tricone over reaming from 55' to 58' 60 65 VISUAL CLASSIFICATION A 1.0 70 A 75 GW moist 80 note: adding hydrogel to water to stabilize borehole from 80' to 640'; in pilot hole; using mud during over reaming A 0.8 85 90 note: decrease in coarse grains below 95' note: actual deviation measured = 0.5° at 95' POORLY GRADED SAND WITH SILT & GRAVEL, few silt, little to some fine grained, subangular to angular gravel, some to mostly fine to coarse grained, subangular to angular sand, nonplastic, brown SP-SM GROUNDWATER DEPTH(ft) HOUR 681.40 note: cobbles present A 95 100 note: increase in fines below 75' WELL GRADED GRAVEL WITH SAND, trace silt, little to some fine to coarse grained, subangular to angular sand, some to mostly fine to coarse grained, subangular to angular gravel, nonplastic, brown to grayish-brown 0850 DATE 11-17-10 SAMPLE TYPE LOG OF TEST BORING NO. Continuous Soil Core Examined Samples Consist of 2 - 8oz Glass Jars 1 - 40ml Amber VOA - Methonal Extraction TB-4 Page 2 of 16 PROJECT Cave Creek Landfill Groundwater Investigation 100 Unified Soil Classification or Rock Unit Sample Type Sample Graphical Log 0.7 11-10-10 to 12-10-10 Sample Identification DATE 14-2010-2022 Drill Rate Min/ft. Depth in Feet JOB NO. LOCATION 50' from stake, SWC of landfill RIG TYPE BORING TYPE T-3 Atlas CopCo 5 1/2" O.D. Pilot; 12 1/4" O.D. Tricone Bit DATUM Ground Surface REMARKS SP-SM A VISUAL CLASSIFICATION POORLY GRADED SAND WITH SILT & GRAVEL, continued 105 110 A note: decrease in silts & increase in coarse grains below ~115' 115 GP 120 POORLY GRADED GRAVEL WITH SAND, trace silt & cobbles, little to some fine to coarse grained, angular to subangular sand, some to mostly fine grained, subangular to angular gravel, uncemented, nonplastic, grayish-brown A note: slight rig chatter during 12 1/4" tricone over reaming at 123' 125 130 A 135 note: decrease in gravel below ~138' 140 SW-SM A WELL GRADED SAND WITH SILT & GRAVEL, few silt, little to some fine grained, subangular to angular gravel, some to mostly fine to coarse grained, subangular to angular sand, nonplastic, grayish-brown 145 150 GROUNDWATER DEPTH(ft) HOUR 681.40 0850 DATE 11-17-10 SAMPLE TYPE LOG OF TEST BORING NO. Continuous Soil Core Examined Samples Consist of 2 - 8oz Glass Jars 1 - 40ml Amber VOA - Methonal Extraction TB-4 Page 3 of 16 PROJECT Cave Creek Landfill Groundwater Investigation Unified Soil Classification or Rock Unit Sample Type Sample Graphical Log 150 11-10-10 to 12-10-10 Sample Identification DATE 14-2010-2022 Drill Rate Min/ft. Depth in Feet JOB NO. LOCATION 50' from stake, SWC of landfill RIG TYPE BORING TYPE T-3 Atlas CopCo 5 1/2" O.D. Pilot; 12 1/4" O.D. Tricone Bit DATUM Ground Surface REMARKS SW-SM A VISUAL CLASSIFICATION WELL GRADED SAND WITH SILT & GRAVEL, continued 155 160 A 165 170 A 175 180 A 185 note: decrease in fines & increase in coarse grains below ~185' POORLY GRADED GRAVEL WITH SAND, little to some fine to coarse grained, subangular to angular sand, some to mostly fine to coarse grained, subangular to angular gravel, nonplastic, grayish-brown GP 190 A note: cobbles present 195 200 note: actual deviation measured = 1.1° at 195' GROUNDWATER DEPTH(ft) HOUR 681.40 0850 DATE 11-17-10 SAMPLE TYPE LOG OF TEST BORING NO. Continuous Soil Core Examined Samples Consist of 2 - 8oz Glass Jars 1 - 40ml Amber VOA - Methonal Extraction TB-4 Page 4 of 16 PROJECT Cave Creek Landfill Groundwater Investigation 200 Unified Soil Classification or Rock Unit Sample Type Sample Graphical Log 0.7 11-10-10 to 12-10-10 Sample Identification DATE 14-2010-2022 Drill Rate Min/ft. Depth in Feet JOB NO. LOCATION 50' from stake, SWC of landfill RIG TYPE BORING TYPE T-3 Atlas CopCo 5 1/2" O.D. Pilot; 12 1/4" O.D. Tricone Bit DATUM Ground Surface REMARKS GP A VISUAL CLASSIFICATION POORLY GRADED GRAVEL WITH SAND, continued 205 210 A 215 220 0.6 A 225 230 note: increase in fines below ~230' A 235 240 SM 0.6 SILTY SAND WITH GRAVEL, little to some fine grained, subangular to angular gravel, little to some silt, some to mostly fine to coarse grained, subangular to angular sand, nonplastic, brown A 245 note: slight rig chatter during 12 1/4" tricone over reaming at 248' 250 GROUNDWATER DEPTH(ft) HOUR 681.40 0850 DATE 11-17-10 SAMPLE TYPE LOG OF TEST BORING NO. Continuous Soil Core Examined Samples Consist of 2 - 8oz Glass Jars 1 - 40ml Amber VOA - Methonal Extraction TB-4 Page 5 of 16 PROJECT Cave Creek Landfill Groundwater Investigation Unified Soil Classification or Rock Unit Sample Type Sample Graphical Log 250 11-10-10 to 12-10-10 Sample Identification DATE 14-2010-2022 Drill Rate Min/ft. Depth in Feet JOB NO. LOCATION 50' from stake, SWC of landfill RIG TYPE BORING TYPE T-3 Atlas CopCo 5 1/2" O.D. Pilot; 12 1/4" O.D. Tricone Bit DATUM Ground Surface REMARKS SM A VISUAL CLASSIFICATION SILTY SAND WITH GRAVEL, continued note: decrease in fines & increase in coarse grains below 255' 255 260 0.6 A GP POORLY GRADED GRAVEL WITH SAND, little to mostly fine to coarse grained, subangular to angular sand, some to mostly fine grained, subangular to angular gravel, nonplastic, brown to grayish-brown SM note: cobbles present SILTY SAND WITH GRAVEL, little to some silt, little to some fine grained, subangular to angular gravel, some to mostly fine to coarse grained, subangular to angular sand, nonplastic, light brown 265 270 note: decrease in fines below 270' A GP note: lost water/mud circulation at 275' during 12 1/4" over reaming 275 SM 280 0.5 POORLY GRADED GRAVEL WITH SAND, little to some fine to coarse grained, subangular to angular sand, some to mostly fine grained, subangular to angular gravel, nonplastic, gray note: cobbles present SILTY SAND WITH GRAVEL, little to some silt, little to some fine grained, subangular to angular gravel, some to mostly fine to coarse grained, subangular to angular sand, nonplastic, light brown to brown A 285 290 A 295 note: heavy rig chatter during 12 1/4" tricone over reaming at 300' note: actual deviation measured = 0.2° at 300' 300 GROUNDWATER DEPTH(ft) HOUR 681.40 0850 DATE 11-17-10 SAMPLE TYPE LOG OF TEST BORING NO. Continuous Soil Core Examined Samples Consist of 2 - 8oz Glass Jars 1 - 40ml Amber VOA - Methonal Extraction TB-4 Page 6 of 16 PROJECT Cave Creek Landfill Groundwater Investigation 300 Unified Soil Classification or Rock Unit Sample Type Sample Graphical Log 0.6 11-10-10 to 12-10-10 Sample Identification DATE 14-2010-2022 Drill Rate Min/ft. Depth in Feet JOB NO. LOCATION 50' from stake, SWC of landfill RIG TYPE BORING TYPE T-3 Atlas CopCo 5 1/2" O.D. Pilot; 12 1/4" O.D. Tricone Bit DATUM Ground Surface REMARKS SM A VISUAL CLASSIFICATION SILTY SAND WITH GRAVEL, continued 305 note: heavy rig chatter during 12 1/4" tricone over reaming at 305' 310 note: decrease in fines & increase gravels below 309' POORLY GRADED GRAVEL WITH SAND, trace silt, little to some fine to coarse grained, subangular to angular sand, some to mostly fine to coarse grained, subangular to angular gravel, nonplastic, light brown to grayish-brown GP A note: cobbles present 315 320 0.7 A 325 330 note: reddish-brown fines at 330' A 335 340 0.6 A 345 note: slight rig chatter during 12 1/4" tricone over reaming at 348' 350 GROUNDWATER DEPTH(ft) HOUR 681.40 0850 DATE 11-17-10 SAMPLE TYPE LOG OF TEST BORING NO. Continuous Soil Core Examined Samples Consist of 2 - 8oz Glass Jars 1 - 40ml Amber VOA - Methonal Extraction TB-4 Page 7 of 16 PROJECT Cave Creek Landfill Groundwater Investigation Unified Soil Classification or Rock Unit Sample Type Sample Graphical Log 350 11-10-10 to 12-10-10 Sample Identification DATE 14-2010-2022 Drill Rate Min/ft. Depth in Feet JOB NO. LOCATION 50' from stake, SWC of landfill RIG TYPE BORING TYPE T-3 Atlas CopCo 5 1/2" O.D. Pilot; 12 1/4" O.D. Tricone Bit DATUM Ground Surface REMARKS GP A VISUAL CLASSIFICATION POORLY GRADED GRAVEL WITH SAND, continued note: silty sand lense at 355' 355 360 0.5 note: slight to moderate rig chatter during 12 1/4" tricone over reaming at 360' A 365 note: decrease in fines from 365' to 370' 370 note: moderate to heavy rig chatter during 12 1/4" tricone over reaming at 368' WELL GRADED SAND WITH SILT & GRAVEL, little to some fine grained, subangular to angular gravel, some to mostly fine to coarse grained, subangular to subrounded sand, nonplastic, brown SW-SM A 375 380 0.4 A 385 note: decrease in fines, color change to grayish-brown, increase in gravel below 385' WELL GRADED SAND WITH GRAVEL, little to mostly fine grained, subangular to angular gravel, some to mostly fine to coarse grained, subangular to angular sand, nonplastic, grayish-brown to gray to dark gray SW 390 A note: heavy rig chatter during 12 1/4" tricone over reaming at 392' 395 note: slight rig chatter during 12 1/4" tricone over reaming at 398' 400 GROUNDWATER DEPTH(ft) HOUR 681.40 0850 DATE 11-17-10 SAMPLE TYPE LOG OF TEST BORING NO. Continuous Soil Core Examined Samples Consist of 2 - 8oz Glass Jars 1 - 40ml Amber VOA - Methonal Extraction TB-4 Page 8 of 16 PROJECT Cave Creek Landfill Groundwater Investigation 400 Unified Soil Classification or Rock Unit Sample Type Sample Graphical Log 0.5 11-10-10 to 12-10-10 Sample Identification DATE 14-2010-2022 Drill Rate Min/ft. Depth in Feet JOB NO. LOCATION 50' from stake, SWC of landfill RIG TYPE BORING TYPE T-3 Atlas CopCo 5 1/2" O.D. Pilot; 12 1/4" O.D. Tricone Bit DATUM Ground Surface REMARKS SW A VISUAL CLASSIFICATION WELL GRADED SAND WITH GRAVEL, continued note: moderate to heavy rig chatter during 12 1/4" tricone over reaming at 400' 405 410 note: lost water/mud circulation during 12 1/4" over reaming, an estimated 300 gals, at 410' A 415 420 0.5 A 425 note: silts below 425', color change back to brownish-gray WELL GRADED SAND WITH SILT & GRAVEL, few silt, little to some fine grained, subangular to angular gravel, some to mostly fine to coarse grained, subangular to angular sand, nonplastic, grayish-brown to light brown SW-SM 430 A 435 440 0.6 A 445 450 GROUNDWATER DEPTH(ft) HOUR 681.40 0850 DATE 11-17-10 SAMPLE TYPE LOG OF TEST BORING NO. Continuous Soil Core Examined Samples Consist of 2 - 8oz Glass Jars 1 - 40ml Amber VOA - Methonal Extraction TB-4 Page 9 of 16 PROJECT Cave Creek Landfill Groundwater Investigation Unified Soil Classification or Rock Unit Sample Type Sample Graphical Log 450 11-10-10 to 12-10-10 Sample Identification DATE 14-2010-2022 Drill Rate Min/ft. Depth in Feet JOB NO. A LOCATION 50' from stake, SWC of landfill RIG TYPE BORING TYPE T-3 Atlas CopCo 5 1/2" O.D. Pilot; 12 1/4" O.D. Tricone Bit DATUM Ground Surface REMARKS VISUAL CLASSIFICATION SW-SM WELL GRADED SAND WITH SILT & GRAVEL, continued SM SILTY SAND WITH GRAVEL, little to some silt, little to some fine grained, subangular to angular gravel, some to mostly fine to coarse grained, subangular to angular sand, nonplastic, brown 455 460 A note: decrease in fines below 465' 465 SW-SM 470 WELL GRADED SAND WITH SILT & GRAVEL, few silt, little to some fine grained, subangular to angular gravel, some to mostly fine to coarse grained, subangular to angular sand, nonplastic, grayish-brown A note: moderate to heavy rig chatter during 12 1/4" tricone over reaming at 473' 475 480 A 485 490 note: moderate rig chatter during 12 1/4" tricone over reaming at 490' A 495 500 GROUNDWATER DEPTH(ft) HOUR 681.40 0850 DATE 11-17-10 SAMPLE TYPE LOG OF TEST BORING NO. Continuous Soil Core Examined Samples Consist of 2 - 8oz Glass Jars 1 - 40ml Amber VOA - Methonal Extraction TB-4 Page 10 of 16 PROJECT Cave Creek Landfill Groundwater Investigation Unified Soil Classification or Rock Unit Sample Type Sample Graphical Log 500 11-10-10 to 12-10-10 Sample Identification DATE 14-2010-2022 Drill Rate Min/ft. Depth in Feet JOB NO. LOCATION 50' from stake, SWC of landfill RIG TYPE BORING TYPE T-3 Atlas CopCo 5 1/2" O.D. Pilot; 12 1/4" O.D. Tricone Bit DATUM Ground Surface REMARKS SW-SM A VISUAL CLASSIFICATION WELL GRADED SAND WITH SILT & GRAVEL, continued 505 note: moderate to heavy rig chatter during 12 1/4" tricone over reaming at 508' 510 A 515 520 A note: lost water/mud circulation during 12 1/4" over reaming at 525' 525 530 A 535 540 A 545 550 GROUNDWATER DEPTH(ft) HOUR 681.40 0850 DATE 11-17-10 SAMPLE TYPE LOG OF TEST BORING NO. Continuous Soil Core Examined Samples Consist of 2 - 8oz Glass Jars 1 - 40ml Amber VOA - Methonal Extraction TB-4 Page 11 of 16 PROJECT Cave Creek Landfill Groundwater Investigation Unified Soil Classification or Rock Unit Sample Type Sample Graphical Log 550 11-10-10 to 12-10-10 Sample Identification DATE 14-2010-2022 Drill Rate Min/ft. Depth in Feet JOB NO. LOCATION 50' from stake, SWC of landfill RIG TYPE BORING TYPE T-3 Atlas CopCo 5 1/2" O.D. Pilot; 12 1/4" O.D. Tricone Bit DATUM Ground Surface REMARKS SW-SM A VISUAL CLASSIFICATION WELL GRADED SAND WITH SILT & GRAVEL, continued 555 560 A note: slight rig chatter during 12 1/4" tricone over reaming at 565' 565 GP 570 POORLY GRADED GRAVEL WITH SAND, trace silt, little to some fine to coarse grained, subangular to angular sand, some to mostly fine to coarse grained, subangular to angular gravel, nonplastic, grayish-brown A 575 580 A 585 590 A note: increase in fines below 595' 595 600 SM GROUNDWATER DEPTH(ft) HOUR 681.40 SILTY SAND WITH GRAVEL, little to some silt, little to some fine to coarse grained, subangular to angular gravel, some to mostly fine to coarse grained, subangular to angular sand, nonplastic, brown 0850 DATE 11-17-10 SAMPLE TYPE LOG OF TEST BORING NO. Continuous Soil Core Examined Samples Consist of 2 - 8oz Glass Jars 1 - 40ml Amber VOA - Methonal Extraction TB-4 Page 12 of 16 PROJECT Cave Creek Landfill Groundwater Investigation Unified Soil Classification or Rock Unit Sample Type Sample Graphical Log 600 11-10-10 to 12-10-10 Sample Identification DATE 14-2010-2022 Drill Rate Min/ft. Depth in Feet JOB NO. LOCATION 50' from stake, SWC of landfill RIG TYPE BORING TYPE T-3 Atlas CopCo 5 1/2" O.D. Pilot; 12 1/4" O.D. Tricone Bit DATUM Ground Surface REMARKS SM A VISUAL CLASSIFICATION SILTY SAND WITH GRAVEL, continuned 605 610 note: lost water/mud circulation during 12 1/4" over reaming, an estimated 600 to 700 gals, at 600' A 615 620 0.5 A note: decrease in fines below 625' 625 GP 630 POORLY GRADED GRAVEL WITH SAND, trace silt, little to some fine to coarse grained, subangular to angular sand, some to mostly fine to coarse grained, subangular to angular gravel, nonplastic, gray to dark gray A note: cobbles present 635 640 0.7 note: not adding hydrogel for clean water sample from 640' to 700' in pilot hole; using mud during over reaming A 645 650 note: slight to moderate rig chatter during 12 1/4" tricone over reaming at 648' GROUNDWATER DEPTH(ft) HOUR 681.40 0850 DATE 11-17-10 SAMPLE TYPE LOG OF TEST BORING NO. Continuous Soil Core Examined Samples Consist of 2 - 8oz Glass Jars 1 - 40ml Amber VOA - Methonal Extraction TB-4 Page 13 of 16 PROJECT Cave Creek Landfill Groundwater Investigation Unified Soil Classification or Rock Unit Sample Type Sample Graphical Log 650 11-10-10 to 12-10-10 Sample Identification DATE 14-2010-2022 Drill Rate Min/ft. Depth in Feet JOB NO. LOCATION 50' from stake, SWC of landfill RIG TYPE BORING TYPE T-3 Atlas CopCo 5 1/2" O.D. Pilot; 12 1/4" O.D. Tricone Bit DATUM Ground Surface REMARKS GP A VISUAL CLASSIFICATION POORLY GRADED GRAVEL WITH SAND, continued 655 660 0.7 A 665 670 A 675 680 0.5 A note: collected groundwater sample: TB-04-700-111710 at 10:20 on 11-17-10 685 690 A 695 700 GROUNDWATER DEPTH(ft) HOUR 681.40 0850 DATE 11-17-10 SAMPLE TYPE LOG OF TEST BORING NO. Continuous Soil Core Examined Samples Consist of 2 - 8oz Glass Jars 1 - 40ml Amber VOA - Methonal Extraction TB-4 Page 14 of 16 PROJECT Cave Creek Landfill Groundwater Investigation Unified Soil Classification or Rock Unit Sample Type Sample Graphical Log 700 11-10-10 to 12-10-10 Sample Identification DATE 14-2010-2022 Drill Rate Min/ft. Depth in Feet JOB NO. GP A LOCATION 50' from stake, SWC of landfill RIG TYPE BORING TYPE T-3 Atlas CopCo 5 1/2" O.D. Pilot; 12 1/4" O.D. Tricone Bit DATUM Ground Surface REMARKS note: using mud during over reaming from 700' to 767' SM 705 VISUAL CLASSIFICATION POORLY GRADED GRAVEL WITH SAND, continued SILTY SAND, little silt, little fine grained sand, mostly medium to coarse grained, angular to subangular sand, brown to black note: possibly few clay with low to medium plasticity 710 715 720 725 730 735 740 745 A note: increase in coarse grained sand below 715' 12.8 6.6 A note: increase in medium grained sand & increase in silt below 725' 7.8 7.8 A 5.0 6.8 A 5.0 5.8 750 GROUNDWATER DEPTH(ft) HOUR 681.40 0850 DATE 11-17-10 SAMPLE TYPE LOG OF TEST BORING NO. Continuous Soil Core Examined Samples Consist of 2 - 8oz Glass Jars 1 - 40ml Amber VOA - Methonal Extraction TB-4 Page 15 of 16 PROJECT Cave Creek Landfill Groundwater Investigation 750 Unified Soil Classification or Rock Unit Sample Type Sample Graphical Log 4.3 11-10-10 to 12-10-10 Sample Identification DATE 14-2010-2022 Drill Rate Min/ft. Depth in Feet JOB NO. A 755 760 765 LOCATION 50' from stake, SWC of landfill RIG TYPE BORING TYPE T-3 Atlas CopCo 5 1/2" O.D. Pilot; 12 1/4" O.D. Tricone Bit DATUM Ground Surface REMARKS VISUAL CLASSIFICATION SM SILTY SAND, continued SM SILTY SAND, little silt, little to some medium to coarse grained sand, some to mostly fine grained sand, brown to black note: possible few clay with low to medium plasticity 5.8 6.5 Total Depth = 767' Stopped 5 1/2" percussion hammer at 700' Stopped 12 1/4" tricone at 767' 770 note: downhole geophysics conducted by Southwest Exploration on 12-10-10 775 780 785 790 795 800 GROUNDWATER DEPTH(ft) HOUR 681.40 0850 DATE 11-17-10 SAMPLE TYPE LOG OF TEST BORING NO. Continuous Soil Core Examined Samples Consist of 2 - 8oz Glass Jars 1 - 40ml Amber VOA - Methonal Extraction TB-4 Page 16 of 16 PROJECT Cave Creek Landfill Groundwater Investigation Unified Soil Classification or Rock Unit Sample Type Sample Graphical Log 9-21-10 to 10-22-10 Sample Identification DATE 14-2010-2022 Drill Rate Min/ft. Depth in Feet JOB NO. 0 SM 5 LOCATION South of Landfill RIG TYPE BORING TYPE T-3 Atlas CopCo Reverse Air Rotary 5 1/2" O.D. Pilot; 9 7/8" O.D. Tricone Bit; 12 1/4" O.D. Tricone Bit Ground Surface DATUM REMARKS VISUAL CLASSIFICATION note: adding water for dust control from 0 to 180' in pilot hole; using mud during over reaming SILTY SAND, few subangular to subrounded cobbles & boulders up to 36" in diameter, few fine to coarse grained gravel, some silt, mostly medium to coarse grained sand, uncemented to weakly cemented, nonplastic, light brown to brown 10 15 20 note: difficulty drilling during conductor casing installation using 17 1/4" drill bit from 0 to 20' 25 30 35 SW-SM WELL GRADED SAND WITH SILT & GRAVEL, few silt, little to some fine to coarse grained, subangular to subrounded gravel, mostly fine to coarse grained, subangular to subrounded sand, nonplastic, brown to dark brown 40 45 50 note: becoming poorly graded below 45' GROUNDWATER DEPTH(ft) HOUR 686.15 10:38 DATE 9-24-10 SAMPLE TYPE LOG OF TEST BORING NO. Continuous Soil Core Examined Samples Consist of 2 - 8oz Glass Jars 1 - 40ml Amber VOA - Methonal Extraction TB-5 Page 1 of 16 PROJECT Cave Creek Landfill Groundwater Investigation Unified Soil Classification or Rock Unit Sample Type Sample Graphical Log 9-21-10 to 10-22-10 Sample Identification DATE 14-2010-2022 Drill Rate Min/ft. Depth in Feet JOB NO. 50 LOCATION South of Landfill RIG TYPE BORING TYPE T-3 Atlas CopCo Reverse Air Rotary 5 1/2" O.D. Pilot; 9 7/8" O.D. Tricone Bit; 12 1/4" O.D. Tricone Bit Ground Surface DATUM REMARKS SP-SM 55 VISUAL CLASSIFICATION POORLY GRADED SAND WITH SILT & GRAVEL, continued note: lost circulation during over reaming with 9 7/8" tricone bit at 55' 60 65 GW-GM WELL GRADED GRAVEL WITH SILT & SAND, trace cobbles & boulders, few silt, few to little medium to coarse grained, subangular to subrounded sand, mostly fine to coarse grained, subangular to subrounded gravel, nonplastic, brown 70 note: actual deviation measured = 0.5° at 70' 75 80 85 90 95 100 GROUNDWATER DEPTH(ft) HOUR 686.15 10:38 DATE 9-24-10 SAMPLE TYPE LOG OF TEST BORING NO. Continuous Soil Core Examined Samples Consist of 2 - 8oz Glass Jars 1 - 40ml Amber VOA - Methonal Extraction TB-5 Page 2 of 16 PROJECT Cave Creek Landfill Groundwater Investigation Unified Soil Classification or Rock Unit Sample Type Sample Graphical Log 9-21-10 to 10-22-10 Sample Identification DATE 14-2010-2022 Drill Rate Min/ft. Depth in Feet JOB NO. 100 LOCATION South of Landfill RIG TYPE BORING TYPE T-3 Atlas CopCo Reverse Air Rotary 5 1/2" O.D. Pilot; 9 7/8" O.D. Tricone Bit; 12 1/4" O.D. Tricone Bit Ground Surface DATUM REMARKS GW-GM VISUAL CLASSIFICATION WELL GRADED GRAVEL WITH SILT & SAND, continued 105 note: actual deviation measured = 0.4° at 108' 110 115 120 125 ML SANDY SILT WITH GRAVEL, little fine to coarse grained, subangular to subrounded gravel, some fine to coarse grained, subangular to subrounded sand, weakly cemented, nonplastic, brown to light brown GW-GM WELL GRADED GRAVEL WITH SILT & SAND, trace cobbles, few silt, few to little medium to coarse grained, subangular to subrounded sand, mostly fine to coarse grained, subangular to subrounded gravel, nonplastic, brown to grayish-brown 130 135 140 145 150 GROUNDWATER DEPTH(ft) HOUR 686.15 10:38 DATE 9-24-10 SAMPLE TYPE LOG OF TEST BORING NO. Continuous Soil Core Examined Samples Consist of 2 - 8oz Glass Jars 1 - 40ml Amber VOA - Methonal Extraction TB-5 Page 3 of 16 PROJECT Cave Creek Landfill Groundwater Investigation Unified Soil Classification or Rock Unit Sample Type Sample Graphical Log 9-21-10 to 10-22-10 Sample Identification DATE 14-2010-2022 Drill Rate Min/ft. Depth in Feet JOB NO. 150 LOCATION South of Landfill RIG TYPE BORING TYPE T-3 Atlas CopCo Reverse Air Rotary 5 1/2" O.D. Pilot; 9 7/8" O.D. Tricone Bit; 12 1/4" O.D. Tricone Bit Ground Surface DATUM REMARKS GW-GM VISUAL CLASSIFICATION WELL GRADED GRAVEL WITH SILT & SAND, continued 155 160 165 note: actual deviation measured = 0.5° at 168' 170 175 180 note: increase in fines below 180' 185 SM 190 note: adding hydrogel to water to stabilize borehole from 180' to 320' in pilot hole; using mud during over reaming 195 200 GROUNDWATER DEPTH(ft) HOUR 686.15 SILTY SAND WITH GRAVEL, trace cobbles, llittle fine to coarse grained, subangular to subrounded gravel, mostly fine to coarse grained, subangular to subrounded sand, nonplastic, brown 10:38 DATE 9-24-10 SAMPLE TYPE LOG OF TEST BORING NO. Continuous Soil Core Examined Samples Consist of 2 - 8oz Glass Jars 1 - 40ml Amber VOA - Methonal Extraction TB-5 Page 4 of 16 PROJECT Cave Creek Landfill Groundwater Investigation Unified Soil Classification or Rock Unit Sample Type Sample Graphical Log 9-21-10 to 10-22-10 Sample Identification DATE 14-2010-2022 Drill Rate Min/ft. Depth in Feet JOB NO. 200 LOCATION South of Landfill RIG TYPE BORING TYPE T-3 Atlas CopCo Reverse Air Rotary 5 1/2" O.D. Pilot; 9 7/8" O.D. Tricone Bit; 12 1/4" O.D. Tricone Bit Ground Surface DATUM REMARKS SM VISUAL CLASSIFICATION SILTY SAND WITH GRAVEL, continued 205 210 215 note: hard drilling from 218' to 225' 220 note: possible cobbles & boulders present, heavy rig chatter during over reaming with 9 7/8" tricone bit at 218' 225 note: possible cobbles & boulders present, heavy rig chatter during over reaming with 9 7/8" tricone bit at 225' 230 note: actual deviation measured = 0.6° at 230' note: increase in coarse grained material below 235' WELL GRADED SAND WITH SILT & GRAVEL, trace cobbles, few silt, little to some fine grained, subangular to subrounded gravel, mostly fine to coarse grained, subangular to subrounded sand, nonplastic, brown 235 SW-SM 240 note: actual deviation measured = 0.7° at 240' 245 note: actual deviation measured = 0.5° at 248' 250 GROUNDWATER DEPTH(ft) HOUR 686.15 10:38 DATE 9-24-10 SAMPLE TYPE LOG OF TEST BORING NO. Continuous Soil Core Examined Samples Consist of 2 - 8oz Glass Jars 1 - 40ml Amber VOA - Methonal Extraction TB-5 Page 5 of 16 PROJECT Cave Creek Landfill Groundwater Investigation Unified Soil Classification or Rock Unit Sample Type Sample Graphical Log 9-21-10 to 10-22-10 Sample Identification DATE 14-2010-2022 Drill Rate Min/ft. Depth in Feet JOB NO. 250 LOCATION South of Landfill RIG TYPE BORING TYPE T-3 Atlas CopCo Reverse Air Rotary 5 1/2" O.D. Pilot; 9 7/8" O.D. Tricone Bit; 12 1/4" O.D. Tricone Bit Ground Surface DATUM REMARKS SW-SM VISUAL CLASSIFICATION WELL GRADED SAND WITH SILT & GRAVEL, continued 255 note: possible cobbles & boulders present, heavy rig chatter during over reaming with 9 7/8" tricone bit at 259' 260 265 270 275 280 285 290 note: increase in silts below 290' SM SILTY SAND WITH GRAVEL, little to some fine grained, subangular to subrounded gravel, mostly fine to coarse grained, subangular to subrounded sand, nonplastic, brown 295 300 note: possible cobbles & boulders present, heavy rig chatter during over reaming with 9 7/8" tricone bit from 299' to 300' GROUNDWATER DEPTH(ft) HOUR 686.15 10:38 DATE 9-24-10 SAMPLE TYPE LOG OF TEST BORING NO. Continuous Soil Core Examined Samples Consist of 2 - 8oz Glass Jars 1 - 40ml Amber VOA - Methonal Extraction TB-5 Page 6 of 16 PROJECT Cave Creek Landfill Groundwater Investigation Unified Soil Classification or Rock Unit Sample Type Sample Graphical Log 9-21-10 to 10-22-10 Sample Identification DATE 14-2010-2022 Drill Rate Min/ft. Depth in Feet JOB NO. 300 LOCATION South of Landfill RIG TYPE BORING TYPE T-3 Atlas CopCo Reverse Air Rotary 5 1/2" O.D. Pilot; 9 7/8" O.D. Tricone Bit; 12 1/4" O.D. Tricone Bit Ground Surface DATUM REMARKS SM VISUAL CLASSIFICATION SILTY SAND WITH GRAVEL, continued 305 note: actual deviation measured = 0.6° at 308' 310 315 320 325 GM note: stopped adding water & hydrogel from 320' to 360' in pilot hole; using mud during over reaming 330 SILTY GRAVEL WITH SAND, trace cobbles, little silt, little to some fine to coarse grained, subangular to subrounded sand, some fine to coarse grained, subangular to subrounded gravel, nonplastic, brown to grayish-brown note: increase in gravel from 325' to 335' 335 SM 340 SILTY SAND WITH GRAVEL, little to some fine grained, subangular to subrounded gravel, mostly fine to coarse grained, subangular to subrounded sand, nonplastic, light brown to grayish-brown note: increase in silt at 340' 345 350 GROUNDWATER DEPTH(ft) HOUR 686.15 10:38 DATE 9-24-10 SAMPLE TYPE LOG OF TEST BORING NO. Continuous Soil Core Examined Samples Consist of 2 - 8oz Glass Jars 1 - 40ml Amber VOA - Methonal Extraction TB-5 Page 7 of 16 PROJECT Cave Creek Landfill Groundwater Investigation Unified Soil Classification or Rock Unit Sample Type Sample Graphical Log 9-21-10 to 10-22-10 Sample Identification DATE 14-2010-2022 Drill Rate Min/ft. Depth in Feet JOB NO. 350 LOCATION South of Landfill RIG TYPE BORING TYPE T-3 Atlas CopCo Reverse Air Rotary 5 1/2" O.D. Pilot; 9 7/8" O.D. Tricone Bit; 12 1/4" O.D. Tricone Bit Ground Surface DATUM REMARKS SM VISUAL CLASSIFICATION SILTY SAND WITH GRAVEL, continued 355 360 note: adding hydrogel to water to stabilize borehole from 360' to 640' in piolt hole; using mud during over reaming 365 note: actual deviation measured = 0.7° at 368' 370 375 note: possible cobbles & boulders present, heavy rig chatter during over reaming with 9 7/8" tricone bit at 375' 380 385 390 395 400 GROUNDWATER DEPTH(ft) HOUR 686.15 10:38 DATE 9-24-10 SAMPLE TYPE LOG OF TEST BORING NO. Continuous Soil Core Examined Samples Consist of 2 - 8oz Glass Jars 1 - 40ml Amber VOA - Methonal Extraction TB-5 Page 8 of 16 PROJECT Cave Creek Landfill Groundwater Investigation Unified Soil Classification or Rock Unit Sample Type Sample Graphical Log 9-21-10 to 10-22-10 Sample Identification DATE 14-2010-2022 Drill Rate Min/ft. Depth in Feet JOB NO. 400 LOCATION South of Landfill RIG TYPE BORING TYPE T-3 Atlas CopCo Reverse Air Rotary 5 1/2" O.D. Pilot; 9 7/8" O.D. Tricone Bit; 12 1/4" O.D. Tricone Bit Ground Surface DATUM REMARKS SM VISUAL CLASSIFICATION SILTY SAND WITH GRAVEL, continued 405 410 415 420 425 SW-SM WELL GRADED SAND WITH SILT & GRAVEL, trace cobbles, few silt, some fine to coarse grained, angular to subangular gravel, mostly fine to coarse grained, angular to subangular sand, nonplastic, brown to grayish-brown 430 note: black to grayish-brown, gravel and/or cobbles below 425' note: actual deviation measured = 1.1° at 428' 435 note: actual deviation measured = 0.9° at 430' 440 445 450 GROUNDWATER DEPTH(ft) HOUR 686.15 10:38 DATE 9-24-10 SAMPLE TYPE LOG OF TEST BORING NO. Continuous Soil Core Examined Samples Consist of 2 - 8oz Glass Jars 1 - 40ml Amber VOA - Methonal Extraction TB-5 Page 9 of 16 PROJECT Cave Creek Landfill Groundwater Investigation Unified Soil Classification or Rock Unit Sample Type Sample Graphical Log 9-21-10 to 10-22-10 Sample Identification DATE 14-2010-2022 Drill Rate Min/ft. Depth in Feet JOB NO. 450 LOCATION South of Landfill RIG TYPE BORING TYPE T-3 Atlas CopCo Reverse Air Rotary 5 1/2" O.D. Pilot; 9 7/8" O.D. Tricone Bit; 12 1/4" O.D. Tricone Bit Ground Surface DATUM REMARKS SW-SM VISUAL CLASSIFICATION WELL GRADED SAND WITH SILT & GRAVEL, continued 455 460 note: switched to 5 1/2" tricone bit during original pilot hole drilling at 460' 465 note: actual deviation measured = 0.9° at 468' 470 note: increase in silt below 470' SM 475 SILTY SAND WITH GRAVEL, trace cobbles, little to some fine grained, subangular to angular gravel, mostly fine to coarse grained, subangular to subrounded sand, nonplastic, brown 480 485 490 495 500 GP-GM GROUNDWATER DEPTH(ft) HOUR 686.15 POORLY GRADED GRAVEL WITH SILT & SAND 10:38 DATE 9-24-10 SAMPLE TYPE LOG OF TEST BORING NO. Continuous Soil Core Examined Samples Consist of 2 - 8oz Glass Jars 1 - 40ml Amber VOA - Methonal Extraction TB-5 Page 10 of 16 PROJECT Cave Creek Landfill Groundwater Investigation Unified Soil Classification or Rock Unit Sample Type Sample Graphical Log 9-21-10 to 10-22-10 Sample Identification DATE 14-2010-2022 Drill Rate Min/ft. Depth in Feet JOB NO. 500 LOCATION South of Landfill RIG TYPE BORING TYPE T-3 Atlas CopCo Reverse Air Rotary 5 1/2" O.D. Pilot; 9 7/8" O.D. Tricone Bit; 12 1/4" O.D. Tricone Bit Ground Surface DATUM REMARKS GP-GM VISUAL CLASSIFICATION POORLY GRADED GRAVEL WITH SILT & SAND, trace cobble, few silt, little to some fine to coarse, subangular to subrounded sand, mostly fine grained, subangular to angular gravel, nonplastic, grayish-brown 505 note: possible boulders 510 515 note: yellowish-brown to rusty brown & increase in silt below 515' SM SILTY SAND WITH GRAVEL, trace cobbles, little fine grained, subangular to angular gravel, little coarse grained, subangular to subrounded sand, mostly fine to medium grained sand, nonplastic, yellowish-brown 520 525 530 note: brown below 530' note: actual deviation measured = 1.3° at 530' 535 note: decrease in silt below 535' GP-GM POORLY GRADED GRAVEL WITH SILT & SAND, few silt, little to some fine to coarse grained, subangular to subrounded sand, mostly fine grained, subangular to angular gravel, nonplastic, brown 540 545 550 GROUNDWATER DEPTH(ft) HOUR 686.15 10:38 DATE 9-24-10 SAMPLE TYPE LOG OF TEST BORING NO. Continuous Soil Core Examined Samples Consist of 2 - 8oz Glass Jars 1 - 40ml Amber VOA - Methonal Extraction TB-5 Page 11 of 16 PROJECT Cave Creek Landfill Groundwater Investigation Unified Soil Classification or Rock Unit Sample Type Sample Graphical Log 9-21-10 to 10-22-10 Sample Identification DATE 14-2010-2022 Drill Rate Min/ft. Depth in Feet JOB NO. 550 LOCATION South of Landfill RIG TYPE BORING TYPE T-3 Atlas CopCo Reverse Air Rotary 5 1/2" O.D. Pilot; 9 7/8" O.D. Tricone Bit; 12 1/4" O.D. Tricone Bit Ground Surface DATUM REMARKS GP-GM VISUAL CLASSIFICATION POORLY GRADED GRAVEL WITH SILT & SAND, continued note: increase in silt below 555' 555 560 SM SILTY SAND WITH GRAVEL, trace cobbles, little to some fine grained, subangular to angular gravel, mostly fine to coarse grained, subangular to subrounded sand, nonplastic, brown 565 570 575 580 585 note: decrease in coarse grained sand below 585' 590 note: lense of mostly fine grained sand with silt at approximately at 590' 595 600 GROUNDWATER DEPTH(ft) HOUR 686.15 10:38 DATE 9-24-10 SAMPLE TYPE LOG OF TEST BORING NO. Continuous Soil Core Examined Samples Consist of 2 - 8oz Glass Jars 1 - 40ml Amber VOA - Methonal Extraction TB-5 Page 12 of 16 PROJECT Cave Creek Landfill Groundwater Investigation Unified Soil Classification or Rock Unit Sample Type Sample Graphical Log 9-21-10 to 10-22-10 Sample Identification DATE 14-2010-2022 Drill Rate Min/ft. Depth in Feet JOB NO. 600 LOCATION South of Landfill RIG TYPE BORING TYPE T-3 Atlas CopCo Reverse Air Rotary 5 1/2" O.D. Pilot; 9 7/8" O.D. Tricone Bit; 12 1/4" O.D. Tricone Bit Ground Surface DATUM REMARKS SM VISUAL CLASSIFICATION SILTY SAND WITH GRAVEL, continued 605 610 615 620 625 GP-GM POORLY GRADED GRAVEL WITH SILT & SAND, trace cobbles, few silt, little to some fine to coarse grained, subangular to subrounded sand, mostly fine grained, subangular to angular gravel, nonplastic, brown to grayish-brown 630 note: actual deviation measured = 2.7° at 630' 635 note: adding hydrogel in pilot hole from 640' to 700' for clean water sample; using mud during over reaming 640 645 1.75 SM 650 SILTY SAND WITH GRAVEL GROUNDWATER DEPTH(ft) HOUR 686.15 note: increase in silt below 645' 10:38 DATE 9-24-10 SAMPLE TYPE LOG OF TEST BORING NO. Continuous Soil Core Examined Samples Consist of 2 - 8oz Glass Jars 1 - 40ml Amber VOA - Methonal Extraction TB-5 Page 13 of 16 PROJECT Cave Creek Landfill Groundwater Investigation Unified Soil Classification or Rock Unit Sample Type Sample Graphical Log 9-21-10 to 10-22-10 Sample Identification DATE 14-2010-2022 Drill Rate Min/ft. Depth in Feet JOB NO. 650 655 South of Landfill RIG TYPE BORING TYPE T-3 Atlas CopCo Reverse Air Rotary 5 1/2" O.D. Pilot; 9 7/8" O.D. Tricone Bit; 12 1/4" O.D. Tricone Bit Ground Surface DATUM REMARKS SM note: drilling dry from 660' to 675' in pilot hole; using mud during over reaming 1.5 670 675 VISUAL CLASSIFICATION SILTY SAND WITH GRAVEL, trace cobbles, little to some fine to coarse grained, subangular to angular gravel, mostly fine to coarse grained, subangular to subrounded sand, nonplastic, brown 1.75 660 665 LOCATION note: yellowish-brown color from 660' to 670' note: drill started rattling; adding water from 675' to 700' in pilot hole; using mud during over reaming 1.5 note: actual deviation measured = 2.8° at 670' note: increase in silt from 675' to 685' 680 685 1.8 note: collected groundwater sample TB5-700-092410 at 12:40 on 9-24-10 690 695 note: possible cobbles & boulders present below 695', color change to grayish-brown, decrease in fines 1.8 700 GROUNDWATER DEPTH(ft) HOUR 686.15 10:38 DATE 9-24-10 SAMPLE TYPE LOG OF TEST BORING NO. Continuous Soil Core Examined Samples Consist of 2 - 8oz Glass Jars 1 - 40ml Amber VOA - Methonal Extraction TB-5 Page 14 of 16 PROJECT Cave Creek Landfill Groundwater Investigation 700 705 Unified Soil Classification or Rock Unit Sample Type Sample Graphical Log 12.8 9-21-10 to 10-22-10 Sample Identification DATE 14-2010-2022 Drill Rate Min/ft. Depth in Feet JOB NO. LOCATION South of Landfill RIG TYPE BORING TYPE T-3 Atlas CopCo Reverse Air Rotary 5 1/2" O.D. Pilot; 9 7/8" O.D. Tricone Bit; 12 1/4" O.D. Tricone Bit Ground Surface DATUM REMARKS SP A note: using mud during over reaming from 700' to 768' 7.7 VISUAL CLASSIFICATION POORLY GRADED SAND WITH GRAVEL, some to mostly coarse grained, subangular to angular gravel, mostly medium to coarse grained, subangular sand, nonplastic, dark gray to gray 1.1 710 715 720 8.4 A note: zones of cobbles, small boulders up to 1' to 2' thick 9.4 9.2 note: few fine grained sand at 720' A note: cobbles at 723' 725 9.0 13.0 730 735 740 745 A 7.2 7.0 note: slight increase in fine grained sand from 740' to 750' A 6.7 750 GROUNDWATER DEPTH(ft) HOUR 686.15 10:38 DATE 9-24-10 SAMPLE TYPE LOG OF TEST BORING NO. Continuous Soil Core Examined Samples Consist of 2 - 8oz Glass Jars 1 - 40ml Amber VOA - Methonal Extraction TB-5 Page 15 of 16 PROJECT Cave Creek Landfill Groundwater Investigation 760 765 Unified Soil Classification or Rock Unit 9-21-10 to 10-22-10 Sample Identification Sample Type Sample Graphical Log 750 755 DATE 14-2010-2022 Drill Rate Min/ft. Depth in Feet JOB NO. LOCATION South of Landfill RIG TYPE BORING TYPE T-3 Atlas CopCo Reverse Air Rotary 5 1/2" O.D. Pilot; 9 7/8" O.D. Tricone Bit; 12 1/4" O.D. Tricone Bit Ground Surface DATUM REMARKS SP A VISUAL CLASSIFICATION POORLY GRADED SAND WITH GRAVEL, few fine grained sand, some medium to coarse grained, subangular sand & mostly coarse grained, subangular to angular gravel, nonplastic, dark gray to gray 7.4 5.8 note: few to little fine grained sand from 760' to 768' A 6.0 Total depth = 768' Stopped 5 1/2" percussion hammer at 460' Drilled 5 1/2" tricone from 460' to 700' Stopped 9 7/8" tricone at 480' Stopped 12 1/4" tricone at 768' 770 note: downhole geophysics conducted by Southwest Exploration on 10-23-10 775 780 785 790 795 800 GROUNDWATER DEPTH(ft) HOUR 686.15 10:38 DATE 9-24-10 SAMPLE TYPE LOG OF TEST BORING NO. Continuous Soil Core Examined Samples Consist of 2 - 8oz Glass Jars 1 - 40ml Amber VOA - Methonal Extraction TB-5 Page 16 of 16 Cave Creek Landfill Groundwater Investigation PROJECT 0 Unified Soil Classification Landfill Gases PID Meter Reading (ppm) Drilling Fluid Recovery Sample Type Sample Graphical Log 14-2011-2023 DATE 12-1-11 thru 1-5-12 Drill Rate Min/Ft. Depth in Feet JOB NO. SM 0.1 CH4=0% CO2=0% LOCATION South of Old Landfill RIG TYPE BORING TYPE SURFACE ELEV. DATUM Versa Drill Mud Rotary - 15" Dia. Tricone Remarks VISUAL CLASSIFICATION note: using mud starting at surface note: chattering below 2' Disturbed at surface; SILTY SAND WITH GRAVEL, predominantly fine to coarse grained, subangular to subrounded sand, fine to coarse grained, subangular to subrounded gravel, occasional cobbles, uncemented, nonplastic, light brown to brown O2=20.8% 5 Bal=79.2% A 100% 10 0.0 note: air monitoring equipment PID & Landtec CH4=0% CO2=0% Ground Surface O2=20.8% note: cobbles below 5'; >6" in diameter, possible boulders ~2' in diameter below 10' Bal=79.2% 100% 15 0.0 note: mud rotary switched out with hammer bit at 15' very hard to drill note: conductor casing set to 19' CH4=0% CO2=0% O2=20.8% Bal=79.2% A 20 0.0 CH4=0% CO2=0% 8.4 O2=20.7% Bal=79.3% 25 30 GM A 100% 0.0 16.2 SILTY GRAVEL WITH SAND, fine to coarse grained, subangular to subrounded gravel, fine to coarse grained, subangular to subrounded sand, occasional cobbles & boulders, uncemented, nonplastic, grayish-brown CH4=0% CO2=0% O2=20.8% Bal=79.2% 35 40 note: chattering at 35' A 100% 0.0 9.5 CH4=0% CO2=0% O2=20.2% Bal=79.8% 45 50 A 100% GROUNDWATER DEPTH (ft) HOUR 715.8 1450 DATE 1-11-12 0.0 CH4=0% SAMPLE TYPE A - Auger cuttings; NR - No Recovery S - 2" O.D. 1.38" I.D. tube sample U - 3" O.D. 2.42" I.D. tube sample T - 1" O.D. thin-walled tube sample D - 2.5" O.D. 1.9" I.D. tube sample C - California sample LOG OF TEST BORING NO. TB-8 Page 1 of 16 Cave Creek Landfill Groundwater Investigation PROJECT South of Old Landfill RIG TYPE BORING TYPE SURFACE ELEV. DATUM Versa Drill Mud Rotary - 15" Dia. Tricone Unified Soil Classification PID Meter Reading (ppm) Drilling Fluid Recovery Sample Type Sample Graphical Log 7.0 LOCATION Landfill Gases 50 14-2011-2023 DATE 12-1-11 thru 1-5-12 Drill Rate Min/Ft. Depth in Feet JOB NO. CO2=0% GM SILTY GRAVEL WITH SAND, continued SM SILTY SAND WITH GRAVEL, fine to coarse grained, subangular to subrounded sand, fine to coarse grained, subangular to subrounded gravel, uncemented, nonplastic, grayish-brown Ground Surface VISUAL CLASSIFICATION Remarks O2=21% Bal=79% 55 60 A 100% 6.2 0.0 note: deviation measurement 0.25° at 60' note: added third collar for added weight at 60' CH4=0% CO2=0% O2=20.5% Bal=79.5% 65 GM SILTY GRAVEL WITH SAND, fine to coarse grained, subangular to subrounded gravel, fine to coarse grained, subangular to subrounded sand, occasional cobbles & rare boulders, uncemented, nonplastic, grayish-brown to brown SM SILTY SAND WITH GRAVEL, fine to coarse grained, subangular to subrounded sand, fine to coarse grained, subangular to subrounded gravel, rare cobbles, uncemented, nonplastic, grayish-brown A 100% 70 75 80 A 100% 5.0 note: lots of chatter at 80' 85 A 100% 90 95 100 GM A 100% GROUNDWATER DEPTH (ft) HOUR 715.8 1450 DATE 1-11-12 SAMPLE TYPE A - Auger cuttings; NR - No Recovery S - 2" O.D. 1.38" I.D. tube sample U - 3" O.D. 2.42" I.D. tube sample T - 1" O.D. thin-walled tube sample D - 2.5" O.D. 1.9" I.D. tube sample C - California sample SILTY GRAVEL WITH SAND, fine to coarse grained, subangular to subrounded gravel, fine to coarse grained, subangular to subrounded sand, occasional cobbles, rare boulders, uncemented, nonplastic, grayish-brown LOG OF TEST BORING NO. TB-8 Page 2 of 16 Cave Creek Landfill Groundwater Investigation PROJECT 100 4.0 Unified Soil Classification Landfill Gases PID Meter Reading (ppm) Drilling Fluid Recovery Sample Type Sample Graphical Log 14-2011-2023 DATE 12-1-11 thru 1-5-12 Drill Rate Min/Ft. Depth in Feet JOB NO. LOCATION South of Old Landfill RIG TYPE BORING TYPE SURFACE ELEV. DATUM Versa Drill Mud Rotary - 15" Dia. Tricone Ground Surface VISUAL CLASSIFICATION Remarks GM SILTY GRAVEL WITH SAND, continued 105 A 100% 110 115 120 A 100% 0.1 3.6 note: deviation measurement 0.5° at 120' CH4=0.1% CO2=0% O2=21% Bal=78.9% SM SILTY SAND WITH GRAVEL, fine to coarse grained, subangular to subrounded sand, fine to coarse grained, subangular to subrounded gravel, uncemented, nonplastic, grayish-brown 125 A 100% 130 0.0 CH4=0.2% CO2=0% O2=20.8% Bal=79% 135 140 A 100% 0.0 3.7 CH4=0% CO2=0% O2=21.2% Bal=78.8% GM note: chattering at 143' 145 150 A 100% GROUNDWATER DEPTH (ft) HOUR 715.8 1450 DATE 1-11-12 0.0 SILTY GRAVEL WITH SAND, fine to coarse grained, subangular to subrounded gravel, fine to coarse grained, subangular to subrounded sand, occasional cobbles to rare boulders, uncemented, nonplastic, grayish-brown CH4=0% SAMPLE TYPE A - Auger cuttings; NR - No Recovery S - 2" O.D. 1.38" I.D. tube sample U - 3" O.D. 2.42" I.D. tube sample T - 1" O.D. thin-walled tube sample D - 2.5" O.D. 1.9" I.D. tube sample C - California sample LOG OF TEST BORING NO. TB-8 Page 3 of 16 Cave Creek Landfill Groundwater Investigation PROJECT Unified Soil Classification PID Meter Reading (ppm) Drilling Fluid Recovery Sample Type Sample Graphical Log 3.7 Landfill Gases 150 14-2011-2023 DATE 12-1-11 thru 1-5-12 Drill Rate Min/Ft. Depth in Feet JOB NO. CO2=0% GM LOCATION South of Old Landfill RIG TYPE BORING TYPE SURFACE ELEV. DATUM Versa Drill Mud Rotary - 15" Dia. Tricone Ground Surface VISUAL CLASSIFICATION Remarks SILTY GRAVEL WITH SAND, continued O2=21.1% Bal=78.9% 155 160 A 100% 0.0 2.3 CH4=0.1% CO2=0% O2=21.1% Bal=78.8% POORLY GRADED SAND WITH SILT & GRAVEL, predominantly fine grained, subangular to subrounded sand, fine to coarse grained, subangular to subrounded gravel, rare cobbles, uncemented, nonplastic, grayish-brown SP-SM 165 A 100% 170 175 180 A 100% 2.4 0.0 CH4=0% CO2=0% O2=20.2% Bal=79.8% 185 A 100% 190 195 200 note: chattering at 195' A 100% GROUNDWATER DEPTH (ft) HOUR 715.8 1450 DATE 1-11-12 SAMPLE TYPE A - Auger cuttings; NR - No Recovery S - 2" O.D. 1.38" I.D. tube sample U - 3" O.D. 2.42" I.D. tube sample T - 1" O.D. thin-walled tube sample D - 2.5" O.D. 1.9" I.D. tube sample C - California sample LOG OF TEST BORING NO. TB-8 Page 4 of 16 Cave Creek Landfill Groundwater Investigation PROJECT 200 3.0 Unified Soil Classification Landfill Gases PID Meter Reading (ppm) Drilling Fluid Recovery Sample Type Sample Graphical Log 14-2011-2023 DATE 12-1-11 thru 1-5-12 Drill Rate Min/Ft. Depth in Feet JOB NO. SP-SM LOCATION South of Old Landfill RIG TYPE BORING TYPE SURFACE ELEV. DATUM Versa Drill Mud Rotary - 15" Dia. Tricone Ground Surface VISUAL CLASSIFICATION Remarks note: deviation measurement 0° at 200' POORLY GRADED SAND WITH SILT & GRAVEL, continued 205 A 100% 210 0.0 215 CH4=0% CO2=0% O2=20.4% Bal=79.6% SW-SM 220 note: chattering at 218' A 100% 4.9 225 WELL GRADED SAND WITH SILT & GRAVEL, fine to coarse grained, subangular to subrounded sand, fine to coarse grained, subangular to subrounded gravel, occasional cobbles, uncemented, nonplastic, grayish-brown note: chattering at 225' A 100% 230 0.1 CH4=0% CO2=0% O2=20.8% Bal=79.2% 235 240 A 100% 0.0 2.9 SP-SM POORLY GRADED SAND WITH SILT & GRAVEL, predominantly fine to coarse grained, subangular to subrounded sand, fine grained, subangular to subrounded gravel, rare cobbles, uncemented, nonplastic, grayish-brown SP-SM POORLY GRADED SAND WITH SILT, predominantly fine grained, subangular to subrounded sand, uncemented, nonplastic, grayish-brown CH4=0% CO2=0% O2=21.4% Bal=78.6% 245 250 A 100% GROUNDWATER DEPTH (ft) HOUR 715.8 1450 DATE 1-11-12 0.0 CH4=0% SAMPLE TYPE A - Auger cuttings; NR - No Recovery S - 2" O.D. 1.38" I.D. tube sample U - 3" O.D. 2.42" I.D. tube sample T - 1" O.D. thin-walled tube sample D - 2.5" O.D. 1.9" I.D. tube sample C - California sample LOG OF TEST BORING NO. TB-8 Page 5 of 16 Cave Creek Landfill Groundwater Investigation PROJECT South of Old Landfill RIG TYPE BORING TYPE SURFACE ELEV. DATUM Versa Drill Mud Rotary - 15" Dia. Tricone Unified Soil Classification PID Meter Reading (ppm) Drilling Fluid Recovery Sample Type Sample Graphical Log 2.9 LOCATION Landfill Gases 250 14-2011-2023 DATE 12-1-11 thru 1-5-12 Drill Rate Min/Ft. Depth in Feet JOB NO. CO2=0% SP-SM POORLY GRADED SAND WITH SILT, continued SW-SM WELL GRADED SAND WITH SILT & GRAVEL, fine to coarse grained, subangular to subrounded sand, fine to coarse grained, subangular gravel, occasional cobbles, uncemented, nonplastic, grayish-brown Ground Surface VISUAL CLASSIFICATION Remarks O2=21.3% Bal=78.7% 255 260 A 100% 0.0 3.7 CH4=0% CO2=0% O2=21.2% Bal=78.8% 265 A 100% 270 0.0 CH4=0% CO2=0% O2=20.9% Bal=79.1% note: chattering at 275' 275 POORLY GRADED SAND WITH SILT & GRAVEL, predominantly fine grained, subangular to subrounded sand, fine to coarse grained, subangular gravel, occasional to rare cobbles, uncemented, nonplastic, grayish-brown SP-SM 280 A 100% 0.0 3.4 CH4=0.3% CO2=0% O2=20.7% Bal=79.0% 285 SW-SM note: chattering at 285' A 100% 290 0.0 CH4=0% CO2=0% note: mud viscosity = 40 sec WELL GRADED SAND WITH SILT & GRAVEL, fine to coarse grained, subangular to subrounded sand, fine to coarse grained, subangular gravel, occasional cobbles, uncemented, nonplastic, grayish-brown O2=20.8% Bal=79.2% 295 300 A 100% GROUNDWATER DEPTH (ft) HOUR 715.8 1450 DATE 1-11-12 0.0 CH4=0% SAMPLE TYPE A - Auger cuttings; NR - No Recovery S - 2" O.D. 1.38" I.D. tube sample U - 3" O.D. 2.42" I.D. tube sample T - 1" O.D. thin-walled tube sample D - 2.5" O.D. 1.9" I.D. tube sample C - California sample LOG OF TEST BORING NO. TB-8 Page 6 of 16 Cave Creek Landfill Groundwater Investigation PROJECT Unified Soil Classification PID Meter Reading (ppm) Drilling Fluid Recovery Sample Type Sample Graphical Log 2.7 Landfill Gases 300 14-2011-2023 DATE 12-1-11 thru 1-5-12 Drill Rate Min/Ft. Depth in Feet JOB NO. CO2=0% SW-SM LOCATION South of Old Landfill RIG TYPE BORING TYPE SURFACE ELEV. DATUM Versa Drill Mud Rotary - 15" Dia. Tricone Ground Surface VISUAL CLASSIFICATION Remarks WELL GRADED SAND WITH SILT & GRAVEL, continued O2=20.9% Bal=79.1% 305 310 note: chattering at 305' A 0.0 7.7 CH4=0% CO2=0% O2=20.5% Bal=79.5% 315 320 A 100% 0.0 5.2 note: mud density = 9.5 lbs/gal mud viscosity = 35 sec CH4=0% CO2=0% O2=20.4% Bal=79.6% change out mud on 12-8-11 325 GM A 100% 330 0.0 CH4=0% CO2=0% O2=21.1% Bal=78.9% note: mud density = 9.1 lbs/gal mud viscosity = 35 sec SILTY GRAVEL WITH SAND, fine to coarse grained, subangular gravel, fine to coarse grained, subangular to subrounded sand, occasional cobbles, uncemented, nonplastic, grayish-brown 335 340 A 100% 0.0 6.8 CH4=0% CO2=0% O2=21.4% Bal=78.6% 345 350 note: increasing gravel below 345' A 100% GROUNDWATER DEPTH (ft) HOUR 715.8 1450 DATE 1-11-12 0.1 CH4=0% SAMPLE TYPE A - Auger cuttings; NR - No Recovery S - 2" O.D. 1.38" I.D. tube sample U - 3" O.D. 2.42" I.D. tube sample T - 1" O.D. thin-walled tube sample D - 2.5" O.D. 1.9" I.D. tube sample C - California sample LOG OF TEST BORING NO. TB-8 Page 7 of 16 Cave Creek Landfill Groundwater Investigation PROJECT Unified Soil Classification PID Meter Reading (ppm) Drilling Fluid Recovery Sample Type Sample Graphical Log 6.8 Landfill Gases 350 14-2011-2023 DATE 12-1-11 thru 1-5-12 Drill Rate Min/Ft. Depth in Feet JOB NO. CO2=0% GM LOCATION South of Old Landfill RIG TYPE BORING TYPE SURFACE ELEV. DATUM Versa Drill Mud Rotary - 15" Dia. Tricone VISUAL CLASSIFICATION Remarks SILTY GRAVEL WITH SAND, continued note: chatter at 352', slower drilling below 350', possible cobbles O2=21% Bal=79% 355 SP-SM 360 A 95% 0.0 4.5 CH4=0.1% note: deviation measurements = 1° to 1.25° note: chatter at 362' CO2=0.1% O2=20.2% Bal=79.6% 365 A 95% A 95% POORLY GRADED SAND WITH SILT & GRAVEL, predominantly fine grained, subangular to subrounded sand, fine grained, subangular gravel, rare cobbles, uncemented, nonplastic, grayish-brown WELL GRADED SAND WITH SILT & GRAVEL, fine to coarse grained, subangular to subrounded sand, fine grained, subangular gravel, occasional cobbles, uncemented, nonplastic, grayish-brown SW-SM 370 Ground Surface 375 380 3.4 note: chattering at 380' 385 GM A 95% A GROUNDWATER 95% 390 SILTY GRAVEL WITH SAND, fine to coarse grained, subangular gravel, fine to coarse grained, subangular to subrounded sand, occasional cobbles, uncemented, nonplastic, grayish-brown 395 400 DEPTH (ft) HOUR 715.8 1450 DATE 1-11-12 0.0 CO=0% SAMPLE TYPE A - Auger cuttings; NR - No Recovery S - 2" O.D. 1.38" I.D. tube sample U - 3" O.D. 2.42" I.D. tube sample T - 1" O.D. thin-walled tube sample D - 2.5" O.D. 1.9" I.D. tube sample C - California sample LOG OF TEST BORING NO. TB-8 Page 8 of 16 Cave Creek Landfill Groundwater Investigation PROJECT Unified Soil Classification PID Meter Reading (ppm) Drilling Fluid Recovery Sample Type Sample Graphical Log 4.3 Landfill Gases 400 14-2011-2023 DATE 12-1-11 thru 1-5-12 Drill Rate Min/Ft. Depth in Feet JOB NO. LEL=0% GM O2=20.9% 405 LOCATION South of Old Landfill RIG TYPE BORING TYPE SURFACE ELEV. DATUM Versa Drill Mud Rotary - 15" Dia. Tricone Ground Surface VISUAL CLASSIFICATION Remarks note: using PID & 4-gas meter at 400', devation = 1° SILTY GRAVEL WITH SAND, continued note: chatter at 405' A 410 95% 0.0 CO=0% LEL=0% O2=20.9% 415 note: chatter at 417' SW-SM 420 A 95% 0.0 3.7 CO=0% note: chattering at 420' LEL=0% O2=20.9% WELL GRADED SAND WITH SILT & GRAVEL, fine to coarse grained, subangular to subrounded sand, fine grained, subangular gravel, rare cobbles, uncemented, nonplastic, grayish-brown 425 A 430 95% 435 440 GM A 95% 0.0 4.5 CO=0% SILTY GRAVEL WITH SAND, fine to coarse grained, subangular gravel, fine to coarse grained, subangular to subrounded sand, occasional cobbles, uncemented, nonplastic, grayish-brown LEL=0% O2=20.9% 445 SW-SM 450 A GROUNDWATER DEPTH (ft) HOUR 715.8 1450 95% DATE 1-11-12 0.0 WELL GRADED SAND WITH SILT & GRAVEL CO=0% SAMPLE TYPE A - Auger cuttings; NR - No Recovery S - 2" O.D. 1.38" I.D. tube sample U - 3" O.D. 2.42" I.D. tube sample T - 1" O.D. thin-walled tube sample D - 2.5" O.D. 1.9" I.D. tube sample C - California sample LOG OF TEST BORING NO. TB-8 Page 9 of 16 Cave Creek Landfill Groundwater Investigation PROJECT Unified Soil Classification PID Meter Reading (ppm) Drilling Fluid Recovery Sample Type Sample Graphical Log 4.5 Landfill Gases 450 14-2011-2023 DATE 12-1-11 thru 1-5-12 Drill Rate Min/Ft. Depth in Feet JOB NO. LEL=0% SW-SM LOCATION South of Old Landfill RIG TYPE BORING TYPE SURFACE ELEV. DATUM Versa Drill Mud Rotary - 15" Dia. Tricone VISUAL CLASSIFICATION Remarks WELL GRADED SAND WITH SILT & GRAVEL, fine to coarse grained, subangular to subrounded sand, fine to coarse grained, subangular gravel, uncemented, nonplastic, grayish-brown O2=20.9% note: chatter at 455' 455 SP-SM 460 Ground Surface A 95% 0.0 15.8 note: deviation at 1.25°, mud density = 9.2 lbs/gal mud viscosity = 32 sec CO=0% LEL=0% O2=20.9% 465 GM A 470 95% 0.0 note: chatter at 465' CO=0% LEL=0% POORLY GRADED SAND WITH SILT, predominantly fine grained, subangular to subrounded sand, rare gravel, uncemented, nonplastic, brown to grayish-brown SILTY GRAVEL WITH SAND, fine to coarse grained, subangular gravel, fine to coarse grained, subangular to subrounded sand, occasional cobbles, uncemented, nonplastic, grayish-brown O2=20.6% 475 480 note: chatter at 475' A 95% 0.0 6.7 note: mud viscosity = 36 sec, mud density = 9.3 lbs/gal note: thinning mud on 12-14-11 CO=0% LEL=0% O2=20.9% 485 SW-SM A 490 95% 0.0 WELL GRADED SAND WITH SILT & GRAVEL, fine to coarse grained, subangular to subrounded sand, fine grained, subangular gravel, uncemented, nonplastic, grayish-brown CO=0% LEL=0% O2=20.9% 495 500 GM 20.8 A GROUNDWATER DEPTH (ft) HOUR 715.8 1450 95% DATE 1-11-12 0.0 CO=0% note: mud viscosity = 38 sec note: changed mud on 12-15-11, mud density = 9.1 lbs/gal mud viscosity = 35 sec SAMPLE TYPE A - Auger cuttings; NR - No Recovery S - 2" O.D. 1.38" I.D. tube sample U - 3" O.D. 2.42" I.D. tube sample T - 1" O.D. thin-walled tube sample D - 2.5" O.D. 1.9" I.D. tube sample C - California sample SILTY GRAVEL WITH SAND, fine to coarse grained, subangular gravel, fine to coarse grained, subangular to subrounded sand, occasional cobbles, uncemented, nonplastic, grayish-brown LOG OF TEST BORING NO. TB-8 Page 10 of 16 Cave Creek Landfill Groundwater Investigation PROJECT Unified Soil Classification PID Meter Reading (ppm) Drilling Fluid Recovery Sample Type Sample Graphical Log 12.1 Landfill Gases 500 14-2011-2023 DATE 12-1-11 thru 1-5-12 Drill Rate Min/Ft. Depth in Feet JOB NO. LEL=0% GM O2=20.9% 505 LOCATION South of Old Landfill RIG TYPE BORING TYPE SURFACE ELEV. DATUM Versa Drill Mud Rotary - 15" Dia. Tricone VISUAL CLASSIFICATION Remarks note: deviation SILTY GRAVEL WITH SAND, continued at 0.5° to 0.75°, chatter at 500', viscosity = 38 sec density = 9.15 lbs/gal WELL GRADED SAND WITH SILT, fine to coarse grained, subangular to subrounded sand, rare to trace fine grained, subangular gravel, uncemented, nonplastic, grayish-brown SW-SM A 510 95% 0.1 Ground Surface CO=0% LEL=0% O2=20.6% 515 520 note: mud viscosity = 38 sec A 95% 0.1 12.0 CO=0% note: chatter at 520' LEL=0% O2=20.9% 525 530 SILTY SAND WITH GRAVEL, fine to coarse grained, subangular to subrounded sand, fine grained, subangular gravel, rare cobbles, uncemented, nonplastic, grayish-brown to brown SM A 95% 0.0 3.0 CO=0% note: changing out mud on 12-17-11 LEL=0% O2=20.9% 535 540 A 95% 0.0 7.7 note: mud viscosity = 43 sec mud density = 9.1 lbs/gal note: chatter at 543' CO=0% LEL=0% O2=20.9% SW-SM 545 550 A GROUNDWATER DEPTH (ft) HOUR 715.8 1450 95% DATE 1-11-12 0.0 WELL GRADED SAND WITH SILT & GRAVEL, fine to coarse grained, subangular to subrounded sand, fine to coarse grained, subangular gravel, rare cobbles, uncemented, nonplastic, grayish-brown CO=0% SAMPLE TYPE A - Auger cuttings; NR - No Recovery S - 2" O.D. 1.38" I.D. tube sample U - 3" O.D. 2.42" I.D. tube sample T - 1" O.D. thin-walled tube sample D - 2.5" O.D. 1.9" I.D. tube sample C - California sample LOG OF TEST BORING NO. TB-8 Page 11 of 16 Cave Creek Landfill Groundwater Investigation PROJECT Unified Soil Classification 550 Landfill Gases PID Meter Reading (ppm) Drilling Fluid Recovery Sample Type Sample Graphical Log 14-2011-2023 DATE 12-1-11 thru 1-5-12 Drill Rate Min/Ft. Depth in Feet JOB NO. LEL=0% SW-SM LOCATION South of Old Landfill RIG TYPE BORING TYPE SURFACE ELEV. DATUM Versa Drill Mud Rotary - 15" Dia. Tricone Ground Surface VISUAL CLASSIFICATION Remarks WELL GRADED SAND WITH SILT & GRAVEL, continued O2=20.9% 555 560 A 95% 0.0 6.6 note: mud viscosity = 46 sec mud density = 9.2 lbs/gal CO=0% LEL=0% O2=20.9% 565 A 570 95% 0.0 CO=0% LEL=0% O2=20.9% 575 9.0 A 580 95% 0.0 CO=0% LEL=0% O2=20.9% 585 GM A 590 95% 0.0 SILTY GRAVEL WITH SAND, fine to coarse grained, subangular gravel, fine to coarse grained, subangular to subrounded sand, rare to trace cobbles, uncemented, nonplastic, grayish-brown CO=0% LEL=0% O2=20.9% note: driller indicated drilling very hard below 595' 595 note: possible boulders of strongly cemented zone below 595' deviation = 0.5° 600 A GROUNDWATER DEPTH (ft) HOUR 715.8 1450 95% DATE 1-11-12 0.0 CO=0% SAMPLE TYPE A - Auger cuttings; NR - No Recovery S - 2" O.D. 1.38" I.D. tube sample U - 3" O.D. 2.42" I.D. tube sample T - 1" O.D. thin-walled tube sample D - 2.5" O.D. 1.9" I.D. tube sample C - California sample LOG OF TEST BORING NO. TB-8 Page 12 of 16 Cave Creek Landfill Groundwater Investigation PROJECT Unified Soil Classification PID Meter Reading (ppm) Drilling Fluid Recovery Sample Type Sample Graphical Log 16.0 Landfill Gases 600 14-2011-2023 DATE 12-1-11 thru 1-5-12 Drill Rate Min/Ft. Depth in Feet JOB NO. LEL=0% GM O2=20.9% 605 A 610 95% 0.0 CO=0% LOCATION South of Old Landfill RIG TYPE BORING TYPE SURFACE ELEV. DATUM Versa Drill Mud Rotary - 15" Dia. Tricone Ground Surface VISUAL CLASSIFICATION Remarks note: mud viscosity = 33 sec mud density = 9.15 lbs/gal SILTY GRAVEL WITH SAND, continued note: swivel not rotating continuously turns & stops very slow penetration below 595' LEL=0% O2=20.9% 615 620 A 95% 0.0 21.5 CO=0% LEL=0% O2=20.9% note: mud viscosity = 30 sec mud density = 9.3 lbs/gal 625 A 630 95% 0.0 CO=0% LEL=0% O2=20.9% 635 13.4 note: changed out drill bit, same size 14-3/4" tricone A 640 95% 0.0 CO=0% LEL=0% O2=20.9% 645 650 A GROUNDWATER DEPTH (ft) HOUR 715.8 1450 95% DATE 1-11-12 0.0 CO=0% SAMPLE TYPE A - Auger cuttings; NR - No Recovery S - 2" O.D. 1.38" I.D. tube sample U - 3" O.D. 2.42" I.D. tube sample T - 1" O.D. thin-walled tube sample D - 2.5" O.D. 1.9" I.D. tube sample C - California sample LOG OF TEST BORING NO. TB-8 Page 13 of 16 Cave Creek Landfill Groundwater Investigation PROJECT Unified Soil Classification PID Meter Reading (ppm) Drilling Fluid Recovery Sample Type Sample Graphical Log 11.4 Landfill Gases 650 14-2011-2023 DATE 12-1-11 thru 1-5-12 Drill Rate Min/Ft. Depth in Feet JOB NO. LEL=0% GM LOCATION South of Old Landfill RIG TYPE BORING TYPE SURFACE ELEV. DATUM Versa Drill Mud Rotary - 15" Dia. Tricone Ground Surface VISUAL CLASSIFICATION Remarks SILTY GRAVEL WITH SAND, continued O2=20.9% 655 660 note: chatter below 655' A 95% 0.0 4.1 CO=0% LEL=0% O2=20.9% 665 A 670 95% 0.0 note: drill rod bouncing from 665' to 668' CO=0% LEL=0% O2=20.9% 675 680 15.0 A 95% 0.0 15.2 CO=0% note: chatter & bouncing below 680' LEL=0% O2=20.9% 685 SM A 690 95% 0.0 SILTY SAND WITH GRAVEL, fine to medium grained, subangular to subrounded sand, fine grained, subangular gravel, rare cobbles, uncemented, nonplastic, grayish-brown CO=0% LEL=0% O2=20.9% 695 700 A GROUNDWATER DEPTH (ft) HOUR 715.8 1450 95% DATE 1-11-12 0.0 CO=0% SAMPLE TYPE A - Auger cuttings; NR - No Recovery S - 2" O.D. 1.38" I.D. tube sample U - 3" O.D. 2.42" I.D. tube sample T - 1" O.D. thin-walled tube sample D - 2.5" O.D. 1.9" I.D. tube sample C - California sample LOG OF TEST BORING NO. TB-8 Page 14 of 16 Cave Creek Landfill Groundwater Investigation PROJECT Unified Soil Classification PID Meter Reading (ppm) Drilling Fluid Recovery Sample Type Sample Graphical Log 7.6 Landfill Gases 700 14-2011-2023 DATE 12-1-11 thru 1-5-12 Drill Rate Min/Ft. Depth in Feet JOB NO. LEL=0% SM LOCATION South of Old Landfill RIG TYPE BORING TYPE SURFACE ELEV. DATUM Versa Drill Mud Rotary - 15" Dia. Tricone Ground Surface VISUAL CLASSIFICATION Remarks SILTY SAND WITH GRAVEL, continued O2=20.9% 705 710 A 90% 0.0 10.6 CO=0% LEL=0% O2=20.9% 715 720 note: tagged water level at 715.84' & 718.34' BTOC with sounder on 1/11/12 A 90% 0.0 10.0 CO=0% LEL=0% O2=20.9% 725 730 A 90% 0.0 25.8 CO=0% LEL=0% O2=20.9% 735 A 740 90% 0.0 CO=0% LEL=0% O2=20.9% note: mud viscosity = 36 sec density = 9.4 lbs/gal note: chatter below 735', slow penetration rate, mud viscosity = 34 sec, mud density = 9.4 lbs/gal 745 750 A GROUNDWATER DEPTH (ft) HOUR 715.8 1450 90% DATE 1-11-12 SAMPLE TYPE A - Auger cuttings; NR - No Recovery S - 2" O.D. 1.38" I.D. tube sample U - 3" O.D. 2.42" I.D. tube sample T - 1" O.D. thin-walled tube sample D - 2.5" O.D. 1.9" I.D. tube sample C - California sample LOG OF TEST BORING NO. TB-8 Page 15 of 16 Cave Creek Landfill Groundwater Investigation PROJECT 750 7.0 90% Unified Soil Classification Landfill Gases PID Meter Reading (ppm) Drilling Fluid Recovery Sample Type Sample Graphical Log 14-2011-2023 DATE 12-1-11 thru 1-5-12 Drill Rate Min/Ft. Depth in Feet JOB NO. LOCATION South of Old Landfill RIG TYPE BORING TYPE SURFACE ELEV. DATUM Versa Drill Mud Rotary - 15" Dia. Tricone Remarks SM Ground Surface VISUAL CLASSIFICATION SILTY SAND WITH GRAVEL, continued 755 760 A 90% 12.0 0.0 CO=0% LEL=0% O2=20.9% A 765 90% Yellow Jacket Drilling completed drilling to 766' on 1-5-2012 Geophysical logging performed on 1-6-2012 by Southwest Exploration; added sonic logging to determine water level ~715' 770 note: TB-8 was converted to groundwater well MW-8 on 1-9-2012 775 780 785 790 795 800 GROUNDWATER DEPTH (ft) HOUR 715.8 1450 DATE 1-11-12 SAMPLE TYPE A - Auger cuttings; NR - No Recovery S - 2" O.D. 1.38" I.D. tube sample U - 3" O.D. 2.42" I.D. tube sample T - 1" O.D. thin-walled tube sample D - 2.5" O.D. 1.9" I.D. tube sample C - California sample LOG OF TEST BORING NO. TB-8 Page 16 of 16 Cave Creek Landfill - Soil Vapor Monitor Well 3955 East Carefree Highway Phoenix, Arizona PROJECT 0 5.0 Unified Soil Classification Carbon Monoxide/ Oxygen (%) Methane (%) PID Meter Reading (ppm) Sample Type Sample Graphical Log 09-114-03029 DATE 12-17-09 thru 1-16-10 Drill Rate Min./Ft. Depth in Feet JOB NO. GW LOCATION Northeast corner of Transfer Station RIG TYPE SAMPLE TYPE SURFACE ELEV. DATUM Ingersoll Rand T3W Top Drive 8" & 11" Stradex & 7" Hammer Remarks VISUAL CLASSIFICATION Washed cuttings COARSE GRAVEL, considerable fine grained, angular gravel, trace sand, little to no fines, predominantly well graded, angular gravel, gray to brown to beige, moist Water added to borehole to control dust 5 10 7.5 0.0 0.0 0.0/0.0 GW COARSE GRAVEL, considerable fine grained, angular gravel, some sand, trace fines, predominantly well graded, angular gravel, gray to brown to beige, moist 5.0 0.0 0.0 0.0/0.0 GM FINE GRAVEL, some coarse grained, angular gravel, some sand, trace fines, poorly graded, fine grained, angular gravel, gray to brown to beige, wet 6.0 0.3 0.0 0.0/0.0 GW 5.0 0.5 0.0 0.0/0.0 GW/GP 15 20 25 30 5.0 35 40 Fines likely washed away, sample collected in sieve & rinsed before putting on plastic 45 50 GROUNDWATER DEPTH (ft) HOUR none DATE SAMPLE TYPE A - Auger cuttings; NR - No Recovery S - 2" O.D. 1.38" I.D. tube sample U - 3" O.D. 2.42" I.D. tube sample T - 1" O.D. thin-walled tube sample D - 2.5" O.D. 1.9" I.D. tube sample C - California sample FINE GRAVEL, some coarse grained, angular gravel, some coarse grained sand, trace fines, predominantly well graded, fine grained, angular gravel, gray to brown to green to reddish-orange, moist COARSE TO FINE GRAVEL, considerale fine grained, angular gravel, some sand (coarse), trace fines, 50/50 rough split of angular, coarse & fine grained gravel, occasional coarse grained gravel up to 1'6" in diameter, gray to brown to blue LOG OF TEST BORING NO. TSSV-1 Page 1 of 13 Cave Creek Landfill - Soil Vapor Monitor Well 3955 East Carefree Highway Phoenix, Arizona PROJECT Methane (%) 0.0 Unified Soil Classification 0.0 Carbon Monoxide/ Oxygen (%) 50 PID Meter Reading (ppm) Sample Type Sample Graphical Log 09-114-03029 DATE 12-17-09 thru 1-16-10 Drill Rate Min./Ft. Depth in Feet JOB NO. 0.0/0.0 GP LOCATION Northeast corner of Transfer Station RIG TYPE SAMPLE TYPE SURFACE ELEV. DATUM Ingersoll Rand T3W Top Drive 8" & 11" Stradex & 7" Hammer VISUAL CLASSIFICATION Remarks FINE GRAVEL, considerable coarse grained, angular gravel, some coarse grained sand, gray to brown to muli-colored, moist Fines likely washed away 55 60 65 70 0.0 0.1 0.0/0.0 GP FINE GRAVEL, considerable coarse grained, angular gravel, trace coarse grained sand, gray to brown to beige 0.0 0.1 0.0/0.0 GW FINE GRAVEL, considerable coarse grained gravel, trace sand, gray to brown to blue, moist 75 80 85 Fines washed away 90 0.0 0.1 0.0/0.0 GW COARSE GRAVEL, considerable fine grained, angular gravel, trace sand, subrounded, trace fines, occasional gravel up to 1'6" in diameter, angular, gray to brown to blue, moist 95 100 GROUNDWATER DEPTH (ft) HOUR none DATE SAMPLE TYPE A - Auger cuttings; NR - No Recovery S - 2" O.D. 1.38" I.D. tube sample U - 3" O.D. 2.42" I.D. tube sample T - 1" O.D. thin-walled tube sample D - 2.5" O.D. 1.9" I.D. tube sample C - California sample LOG OF TEST BORING NO. TSSV-1 Page 2 of 13 Cave Creek Landfill - Soil Vapor Monitor Well 3955 East Carefree Highway Phoenix, Arizona PROJECT Northeast corner of Transfer Station RIG TYPE SAMPLE TYPE SURFACE ELEV. DATUM Ingersoll Rand T3W Top Drive 8" & 11" Stradex & 7" Hammer 0.0 0.0 0.0/0.0 GW FINE GRAVEL, some coarse grained, angular gravel, some coarse grained, angular to subrounded sand, trace fines, poorly graded, fine grained gravel, predominantly up to 6" to 1mm in diameter, gray to brown to blue, moist 0.0 0.0 0.0/0.0 GW WELL GRADED SAND WITH GRAVEL, occasional coarse grained gravel, some fine grained gravel, trace fines, predominantly coarse grained sand, angular to subangular, pink to gray to brown to white, moist 0.0 0.0 0.0/0.0 SW WELL GRADED SAND WITH GRAVEL, occasional coarse grained gravel, some fine grained gravel, trace fines, predominantly coarse grained, angular to subangular sand, pink to gray to brown to white, moist Methane (%) Unified Soil Classification LOCATION Carbon Monoxide/ Oxygen (%) 100 PID Meter Reading (ppm) Sample Type Sample Graphical Log 09-114-03029 DATE 12-17-09 thru 1-16-10 Drill Rate Min./Ft. Depth in Feet JOB NO. VISUAL CLASSIFICATION Remarks 105 110 115 120 125 130 SW Sample washed by driller, no readings collected GRAVELLY SAND, dark brown to dark gray, 30% gravel, subangular to subrounded, up to 2cm, granitic sand, well graded, coarse to fine, subangular to subrounded, granitic, fines washed out by driller, wet from driller washing sample 135 140 0.5 0.0 0.0/20.4 SW AA at 140' driller stopped washing sample, 5% silt to clay size in sample 145 150 GROUNDWATER DEPTH (ft) HOUR none DATE SAMPLE TYPE A - Auger cuttings; NR - No Recovery S - 2" O.D. 1.38" I.D. tube sample U - 3" O.D. 2.42" I.D. tube sample T - 1" O.D. thin-walled tube sample D - 2.5" O.D. 1.9" I.D. tube sample C - California sample LOG OF TEST BORING NO. TSSV-1 Page 3 of 13 Cave Creek Landfill - Soil Vapor Monitor Well 3955 East Carefree Highway Phoenix, Arizona PROJECT 150 Unified Soil Classification Carbon Monoxide/ Oxygen (%) Methane (%) PID Meter Reading (ppm) Sample Type Sample Graphical Log 09-114-03029 DATE 12-17-09 thru 1-16-10 Drill Rate Min./Ft. Depth in Feet JOB NO. LOCATION Northeast corner of Transfer Station RIG TYPE SAMPLE TYPE SURFACE ELEV. DATUM Ingersoll Rand T3W Top Drive 8" & 11" Stradex & 7" Hammer VISUAL CLASSIFICATION Remarks 0.0 0.0 0.0/20.4 SW AA at 150' 0.0 0.0 0.0/20.3 SW AA at 160' with 5% fine silt (unwashed sample) 0.0 0.0 0.0/20.3 SW AA at 170' decreasing large (to 2cm) gravel (5%), gravel (30%), 0.5cm granitic 0.0 0.0 0.0/20.4 SW GRAVELLY SAND, grayish-black, gravel 30% to 0.5cm with occasional (>5%) to 1cm, granitic, subangular to subrounded, well graded sand, very coarse to fine, subangular to subrounded, granitic, no stain, no odor, 5% silt to clay 4.0 0.0 0.1/20.8 155 160 165 170 175 180 185 1.0 190 AA at 190' GRAVELLY SAND, continued 195 200 6.0 GROUNDWATER DEPTH (ft) HOUR none DATE SP/GP SAMPLE TYPE A - Auger cuttings; NR - No Recovery S - 2" O.D. 1.38" I.D. tube sample U - 3" O.D. 2.42" I.D. tube sample T - 1" O.D. thin-walled tube sample D - 2.5" O.D. 1.9" I.D. tube sample C - California sample SAND WITH GRAVEL, occasional small cobbles, predominantly coarse grained gravel & medium to coarse grained, subangular to subrounded sand, nonplastic, grayish-brown, slight odor LOG OF TEST BORING NO. TSSV-1 Page 4 of 13 Cave Creek Landfill - Soil Vapor Monitor Well 3955 East Carefree Highway Phoenix, Arizona PROJECT 200 6.0 Unified Soil Classification Carbon Monoxide/ Oxygen (%) Methane (%) PID Meter Reading (ppm) Sample Type Sample Graphical Log 09-114-03029 DATE 12-17-09 thru 1-16-10 Drill Rate Min./Ft. Depth in Feet JOB NO. LOCATION Northeast corner of Transfer Station RIG TYPE SAMPLE TYPE SURFACE ELEV. DATUM Ingersoll Rand T3W Top Drive 8" & 11" Stradex & 7" Hammer VISUAL CLASSIFICATION Remarks 0.0 0.1/20.9 SP/GP SAND WITH GRAVEL, continued 205 210 GP GRAVEL & COBBLES WITH SAND, predominantly coarse grained, subrounded gravel & coarse grained, subangular to subrounded sand, nonplastic, gray to dark gray 215 220 1.4 0.0 0.0 0.1/20.8 SP/GP SAND & GRAVEL, occasional cobble, predominantly medium to coarse grained, subangular sand & coarse grained, subrounded gravel with calcium carbonate coatings on some gravel, nonplastic, grayish-brown 1.3 9.6 0.0 0.1/20.4 SAND WITH GRAVEL, rare small cobble, predominantly medium to coarse grained, subangular sand & coarse grained, subrounded gravel, some calcium carbonate coating on gravel, nonplastic, grayish-brown 225 230 SP Adding some water while drilling away, sample 235 240 6.3 2.0 0.0 0.1/20.6 GP SAND WITH GRAVEL, continued, some cobbles, slight odor 245 250 GROUNDWATER DEPTH (ft) HOUR none DATE SAMPLE TYPE A - Auger cuttings; NR - No Recovery S - 2" O.D. 1.38" I.D. tube sample U - 3" O.D. 2.42" I.D. tube sample T - 1" O.D. thin-walled tube sample D - 2.5" O.D. 1.9" I.D. tube sample C - California sample LOG OF TEST BORING NO. TSSV-1 Page 5 of 13 Cave Creek Landfill - Soil Vapor Monitor Well 3955 East Carefree Highway Phoenix, Arizona PROJECT 250 4.7 0.0 0.1/21.1 0.9 0.0 0.1/20.4 3.6 0.0 0.1/20.5 3.9 0.0 0.1/20.4 2.9 0.0 0.1/20.3 Unified Soil Classification Carbon Monoxide/ Oxygen (%) Methane (%) PID Meter Reading (ppm) Sample Type Sample Graphical Log 09-114-03029 DATE 12-17-09 thru 1-16-10 Drill Rate Min./Ft. Depth in Feet JOB NO. LOCATION Northeast corner of Transfer Station RIG TYPE SAMPLE TYPE SURFACE ELEV. DATUM Ingersoll Rand T3W Top Drive 8" & 11" Stradex & 7" Hammer Remarks VISUAL CLASSIFICATION SP SAND WITH GRAVEL, continued, some cobbles, slight odor GP SAND, GRAVEL & COBBLES, increasing in cobbles below 270', predominantly coarse grained, subrounded gravel & medium to coarse grained, subangular to subrounded sand, cemented in zones, nonplastic, gray 255 260 265 270 275 280 285 290 295 300 GROUNDWATER DEPTH (ft) HOUR none DATE SAMPLE TYPE A - Auger cuttings; NR - No Recovery S - 2" O.D. 1.38" I.D. tube sample U - 3" O.D. 2.42" I.D. tube sample T - 1" O.D. thin-walled tube sample D - 2.5" O.D. 1.9" I.D. tube sample C - California sample LOG OF TEST BORING NO. TSSV-1 Page 6 of 13 Cave Creek Landfill - Soil Vapor Monitor Well 3955 East Carefree Highway Phoenix, Arizona PROJECT 300 4.4 0.0 0.1/20.7 2.5 0.0 0.1/20.6 3.5 0.0 0.1/20.6 Unified Soil Classification Carbon Monoxide/ Oxygen (%) Methane (%) PID Meter Reading (ppm) Sample Type Sample Graphical Log 09-114-03029 DATE 12-17-09 thru 1-16-10 Drill Rate Min./Ft. Depth in Feet JOB NO. LOCATION Northeast corner of Transfer Station RIG TYPE SAMPLE TYPE SURFACE ELEV. DATUM Ingersoll Rand T3W Top Drive 8" & 11" Stradex & 7" Hammer Remarks GP VISUAL CLASSIFICATION SAND, GRAVEL & COBBLES, continued, rare small boulder, cemented in zones 305 310 note: considerable cobbles below 310' 315 320 325 330 note: moderately to strongly lime cemented, some to considerable cobbles below 330' 335 340 3.7 0.0 0.1/20.6 note: 8" stradex refusal at 345', pulled casing back to 340', advancing 7" air hammer in open hole 345 350 GROUNDWATER DEPTH (ft) HOUR none DATE SAMPLE TYPE A - Auger cuttings; NR - No Recovery S - 2" O.D. 1.38" I.D. tube sample U - 3" O.D. 2.42" I.D. tube sample T - 1" O.D. thin-walled tube sample D - 2.5" O.D. 1.9" I.D. tube sample C - California sample LOG OF TEST BORING NO. TSSV-1 Page 7 of 13 Cave Creek Landfill - Soil Vapor Monitor Well 3955 East Carefree Highway Phoenix, Arizona PROJECT 350 0.0 0.1 0.1/20.8 Unified Soil Classification Carbon Monoxide/ Oxygen (%) Methane (%) PID Meter Reading (ppm) Sample Type Sample Graphical Log 09-114-03029 DATE 12-17-09 thru 1-16-10 Drill Rate Min./Ft. Depth in Feet JOB NO. LOCATION Northeast corner of Transfer Station RIG TYPE SAMPLE TYPE SURFACE ELEV. DATUM Ingersoll Rand T3W Top Drive 8" & 11" Stradex & 7" Hammer Remarks GP VISUAL CLASSIFICATION SAND, GRAVEL & COBBLES, continued, predominantly coarse grained, subrounded gravel & coarse grained, subangular to subrounded sand, nonplastic, gray to black note: considerable lime cementation in zones, some cobbles, predominantly coarse grained sand & gravel 355 360 0.5 0.1 0.1/20.8 SP SAND WITH GRAVE, predominantly medium to coarse grained, subangular to subrounded sand & fine grained, subrounded gravel, lime cemented in zones, nonplastic, gray to black note: increase in sand at 360' 365 370 0.8 0.0 0.1/20.7 0.7 0.0 0.1/20.7 SP/GP 375 380 SAND & GRAVEL, predominantly coarse grained, subrounded gravel & medium to coarse grained, subangular sand, nonplastic, dark gray to black note: lime cemented in zones 385 390 0.7 0.0 0.1/20.7 395 400 GROUNDWATER DEPTH (ft) HOUR none DATE SAMPLE TYPE A - Auger cuttings; NR - No Recovery S - 2" O.D. 1.38" I.D. tube sample U - 3" O.D. 2.42" I.D. tube sample T - 1" O.D. thin-walled tube sample D - 2.5" O.D. 1.9" I.D. tube sample C - California sample LOG OF TEST BORING NO. TSSV-1 Page 8 of 13 Cave Creek Landfill - Soil Vapor Monitor Well 3955 East Carefree Highway Phoenix, Arizona PROJECT 400 Unified Soil Classification Carbon Monoxide/ Oxygen (%) Methane (%) PID Meter Reading (ppm) Sample Type Sample Graphical Log 09-114-03029 DATE 12-17-09 thru 1-16-10 Drill Rate Min./Ft. Depth in Feet JOB NO. 1.0 0.1 0.2/20.7 1.1 0.0 0.1/20.7 2.2 0.0 0.1/20.8 SP to SP/GP 1.6 0.0 0.1/20.7 SP/GP 2.5 0.0 0.1/20.7 LOCATION Northeast corner of Transfer Station RIG TYPE SAMPLE TYPE SURFACE ELEV. DATUM Ingersoll Rand T3W Top Drive 8" & 11" Stradex & 7" Hammer Remarks SP VISUAL CLASSIFICATION SAND WITH GRAVEL, predominantly coarse grained, subangular sand with well graded gravel, nonplastic, dark gray with some pinkish-brown 405 410 415 420 425 430 SAND & GRAVEL, well graded, subrounded gravel & predominantly medium to coarse grained, subangular sand, nonplastic, dark gray to pinkish-brown 435 440 445 450 GROUNDWATER DEPTH (ft) HOUR none DATE SAMPLE TYPE A - Auger cuttings; NR - No Recovery S - 2" O.D. 1.38" I.D. tube sample U - 3" O.D. 2.42" I.D. tube sample T - 1" O.D. thin-walled tube sample D - 2.5" O.D. 1.9" I.D. tube sample C - California sample LOG OF TEST BORING NO. TSSV-1 Page 9 of 13 Cave Creek Landfill - Soil Vapor Monitor Well 3955 East Carefree Highway Phoenix, Arizona PROJECT 450 1.6 Unified Soil Classification Carbon Monoxide/ Oxygen (%) Methane (%) PID Meter Reading (ppm) Sample Type Sample Graphical Log 09-114-03029 DATE 12-17-09 thru 1-16-10 Drill Rate Min./Ft. Depth in Feet JOB NO. LOCATION Northeast corner of Transfer Station RIG TYPE SAMPLE TYPE SURFACE ELEV. DATUM Ingersoll Rand T3W Top Drive 8" & 11" Stradex & 7" Hammer Remarks 0.0 0.1/20.9 SP/GP VISUAL CLASSIFICATION SAND & GRAVEL, continued note: increase in coarse grained gravel from 450' to 460' 455 460 3.1 0.0 0.1/21.0 3.5 0.0 0.1/20.8 2.4 0.0 0.1/20.8 SP/GP 1.4 0.0 0.1/20.8 note: slight odor at 460' & 470' 465 470 475 480 SAND & GRAVEL, well graded, subrounded to subangular gravel with some calcium carbonate coated particles, predominantly medium to coarse grained, subangular to angular sand, nonplastic, dark gray with some pinkish-brown 485 490 495 500 GROUNDWATER DEPTH (ft) HOUR none DATE SAMPLE TYPE A - Auger cuttings; NR - No Recovery S - 2" O.D. 1.38" I.D. tube sample U - 3" O.D. 2.42" I.D. tube sample T - 1" O.D. thin-walled tube sample D - 2.5" O.D. 1.9" I.D. tube sample C - California sample LOG OF TEST BORING NO. TSSV-1 Page 10 of 13 Cave Creek Landfill - Soil Vapor Monitor Well 3955 East Carefree Highway Phoenix, Arizona PROJECT 500 Unified Soil Classification Carbon Monoxide/ Oxygen (%) Methane (%) PID Meter Reading (ppm) Sample Type Sample Graphical Log 09-114-03029 DATE 12-17-09 thru 1-16-10 Drill Rate Min./Ft. Depth in Feet JOB NO. LOCATION Northeast corner of Transfer Station RIG TYPE SAMPLE TYPE SURFACE ELEV. DATUM Ingersoll Rand T3W Top Drive 8" & 11" Stradex & 7" Hammer Remarks VISUAL CLASSIFICATION 2.3 0.0 0.1/21.0 GW GRAVEL WITH SAND, well graded, subangular to subrounded gravel & predominantly medium to coarse grained, subangular to angular sand, nonplastic, gray to some pinkish-brown 3.9 0.0 0.1/21.0 GW to SP/GW note: increase in sand content, grading to sand & gravel below 510' 3.6 0.0 0.1/20.9 7.5 0.0 0.1/20.8 SP/GP SAND & GRAVEL, rare small cobble, predominantly coarse grained, subangular to subrounded sand & gravel, nonplastic, dark gray with some pinkish-brown 12.0 0.0 0.1/20.9 GRAVEL WITH SAND, predominantly coarse grained, subrounded gravel, some with calcium carbonate coating, predominantly medium to coarse grained, subangular to angular sand 505 510 515 520 525 530 535 540 GP note: some to considerable reddish-brown to orangish-brown iron-oxide stained gravel below 540' 545 550 GROUNDWATER DEPTH (ft) HOUR none DATE SAMPLE TYPE A - Auger cuttings; NR - No Recovery S - 2" O.D. 1.38" I.D. tube sample U - 3" O.D. 2.42" I.D. tube sample T - 1" O.D. thin-walled tube sample D - 2.5" O.D. 1.9" I.D. tube sample C - California sample LOG OF TEST BORING NO. TSSV-1 Page 11 of 13 Cave Creek Landfill - Soil Vapor Monitor Well 3955 East Carefree Highway Phoenix, Arizona PROJECT Northeast corner of Transfer Station RIG TYPE SAMPLE TYPE SURFACE ELEV. DATUM Ingersoll Rand T3W Top Drive 8" & 11" Stradex & 7" Hammer 0.0 0.1/21.0 8.3 0.0 0.1/21.0 note: rare small cobble below 560' 10.0 0.0 0.1/21.2 note: decrease in gravel content below 570', grading to sand & gravel 14.5 0.0 0.1/21.2 SP/GP SAND & GRAVEL, predominantly coarse grained, subangular sand & coarse grained, subrounded gravel, nonplastic, gray with some brown 7.5 0.0 0.1/21.1 note: increase in fine grained gravel below 590' Unified Soil Classification 12.7 Carbon Monoxide/ Oxygen (%) Methane (%) 550 LOCATION PID Meter Reading (ppm) Sample Type Sample Graphical Log 09-114-03029 DATE 12-17-09 thru 1-16-10 Drill Rate Min./Ft. Depth in Feet JOB NO. Remarks GP VISUAL CLASSIFICATION GRAVEL WITH SAND, continued 555 560 565 570 575 580 585 590 595 600 GROUNDWATER DEPTH (ft) HOUR none DATE SAMPLE TYPE A - Auger cuttings; NR - No Recovery S - 2" O.D. 1.38" I.D. tube sample U - 3" O.D. 2.42" I.D. tube sample T - 1" O.D. thin-walled tube sample D - 2.5" O.D. 1.9" I.D. tube sample C - California sample LOG OF TEST BORING NO. TSSV-1 Page 12 of 13 Cave Creek Landfill - Soil Vapor Monitor Well 3955 East Carefree Highway Phoenix, Arizona PROJECT 0.0 0.1/21.3 SP/GP Unified Soil Classification 23.0 Carbon Monoxide/ Oxygen (%) Methane (%) 600 PID Meter Reading (ppm) Sample Type Sample Graphical Log 09-114-03029 DATE 12-17-09 thru 1-16-10 Drill Rate Min./Ft. Depth in Feet JOB NO. LOCATION Northeast corner of Transfer Station RIG TYPE SAMPLE TYPE SURFACE ELEV. DATUM Ingersoll Rand T3W Top Drive 8" & 11" Stradex & 7" Hammer Remarks VISUAL CLASSIFICATION SAND & GRAVEL, continued note: some lime cemented zones 605 610 18.3 0.0 0.1/21.4 Stopped Auger at 610' at 1100 on 1-16-10 Trip out of hole with 7" bit, ready to install, 1st string of 2" schedule 80 PVC 615 620 625 630 635 640 645 650 GROUNDWATER DEPTH (ft) HOUR none DATE SAMPLE TYPE A - Auger cuttings; NR - No Recovery S - 2" O.D. 1.38" I.D. tube sample U - 3" O.D. 2.42" I.D. tube sample T - 1" O.D. thin-walled tube sample D - 2.5" O.D. 1.9" I.D. tube sample C - California sample LOG OF TEST BORING NO. TSSV-1 Page 13 of 13 APPENDIX B GEOPHYSICAL LOGS Memo To Natalie Chrisman Lazarr, PE File no 14-2012-1015 From Michael L. Rucker, PE cc: Tel 602-733-6000 Fax 602-733-6100 Date October 25, 2012 Subject Review of Downhole Geophysical Logs Monitor Wells at Maricopa County Cave Creek Landfill File Geophysical borehole logs performed by Southwest Exploration Services, LLC for the following monitor wells were reviewed by Michael L. Rucker PE with AMEC. MW-04 / TB-5 MW-5 / TB-4 MW-6 / TB-2 MW-7 MW-8 electrical / gamma / caliper electrical / gamma / caliper electrical / gamma / caliper electrical / gamma / caliper dual guard electrical / gamma / caliper / sonic The typical borehole diameters ranged from about 11 inches (MW-6) to about 12 to 16 inches (MW-4, MW-5, MW-7) to 18 inches (MW-8), with larger diameter in the upper 20 feet to accommodate (apparently steel) surface casing. Borehole fluids were reported to be fresh mud with reported typical fluid resistivity ranging from about 5 ohm-m (MW-7) and 7 to 8 ohm-m (MW-6), where a fluid resistivity log was included. Measured resistivities above the groundwater table (assumed to be below depths of about 600 to 700 feet based on convergence of electrical resistivity values from the different measurement spacings) were typically greater than 50 ohm-m at the 16-inch normal spacing, and typically greater than 100 ohm-m at the 64-inch normal spacing. Such high resistivities are consistent with alluvium having little to essentially no clay content. Clays have a very low resistivity (high conductivity), and clay conductivity will dominate the electrical resistivity measurements if sufficient clays are present. A lack of ‘character’ or little change in the spontaneous potential and natural gamma curves are also consistent with an absence of clays in the alluvium materials. Conversely, an absence of clays is consistent with relatively high or higher permeabilites. The shallower alluvium, extending perhaps to depths of about 180 – 200 feet at MW-4, -5, -6 and -7, and perhaps about 100 – 110 feet at MW-8, is consistent with lower density coarse grained alluvium. The natural gamma ray logs have slightly lower counts (lower API units) in that upper portion of the borehole, which is consistent with a lower density of natural radioactive material (derived primarily from slightly radioactive granitic source materials?). Caliper logs at MW-6 and -7 indicate significant overbreakage or instability in the upper borehole; loose sands and gravels and / or cobbles removed from the borehole wall are common reasons for borehole overbreakage. Resistivities, especially for the deeper 64-inch normal, are high to highest in this AMEC Environment & Infrastructure, Inc. 4600 East Washington Street, Suite 600 Phoenix, Arizona 85034-1917 Tel: (602) 733-6000 Fax: (602) 733-6100 www.amec.com Review of Downhole Geophysical Logs Monitoring Wells at Maricopa County Cave Creek Landfill region. This is consistent with low moisture content and / or minimum particle surface area in the geo-material mass that can become moistened or wetted and thus contribute to electrical conductivity (inverse of resistivity). Based on the borehole geophysical results, this upper portion of the alluvium is anticipated to have high to very high permeabilities. A (or several) relatively thin, reduced resistivity zone is logged at the bottom of the shallower alluvium, commonly at a depth of roughly 200 feet (+/-) except at MW-8, where it located at a depth of about 110 feet. A slightly higher average natural gamma count indicates an increase in alluvium material density. Where the 16-inch normal resistivity is less than about 25 ohm-m (it approaches that value in MW-5 and MW-8, a significant increase in alluvium fines may be indicated; vertical flow may be inhibited at these locations. However, such a horizon with sufficiently low resistivity is not shown in the logs to be present across the region having the monitoring wells. Use of the 16-inch normal resistivity as a primary indicator of presence of fines is a function of the alluvium geometry and moisture conditions. Above the groundwater table, alluvium formation saturation or moisture content may be profoundly impacted by invasion of drilling fluid from the borehole. As drilling mud penetrates into the formation, a mud cake forms that stabilizes the borehole. Very short (8-inch normal) resistivity measurements may be profoundly influenced by the borehole fluid. Long (64-inch resistivity measurements may include a significant portion of formation (if above the water table) that is not saturated by drilling fluid as the mud cake inhibits drilling fluid flow into the formation. The 16-inch short normal resistivity is a compromise between borehole influence and (above the water table) formation saturation. The presence of the water table is probably indicated when the 64-inch normal and 16-inch normal resistivity values are similar. However, even below the water table, formation resistivities for the 16-inch and 64-inch resistivities (and guard log resistivities) are greater than about 25 ohm-m. Such high resistivity indicates an absence of fines, and especially clays, in the alluvium. An absence of fines, especially clays in the alluvium is consistent with high permeabilities in the alluvium. Maricopa County Cave Creek Landfill Maricopa County, Arizona October 25, 2012 Page 2 PERMANENT DATUM LOG MEAS. FROM DRILLING MEAS. FROM TB-5 COMPANY AMEC CONSULTANTS CAVE CREEK ARIZONA WELL ID FIELD MARICOPA STATE COUNTY RGE OTHER SERVICES CALIPER TWP K.B. D.F. FRESH MUD G.L. FULL N/A N/A 0.2 FT TRUCK #400 MSI-2PEA-F 1315 FROM SURFACE TO 20 FT 1745 TYPE OF LOGS: E-LOGS-GAMMA RAY MORE: LOCATION SEC ELEVATION CASING RECORD SIZE WGT. 14" SAMPLE INTERVAL LOGGING TRUCK TOOL STRING/SN LOG TIME: ON SITE/OFF SITE TYPE FLUID IN HOLE SALINITY DENSITY LEVEL MAX. REC. TEMP. IMAGE ORIENTED TO: ABOVE PERM. DATUM TO TOTAL DEPTH D. JACOVITCH/D.ECKMAN AMEC-MARK, KAREN 10-23-10 1 E-LOGS-GAMMA-CALIPER 768 FT 764 FT 764 FT SURFACE LAYNE GROUND LEVEL BOREHOLE RECORD BIT FROM 12 1/4" 20 FT DATE RUN No TYPE LOG DEPTH-DRILLER DEPTH-LOGGER BTM LOGGED INTERVAL TOP LOGGED INTERVAL DRILLER / RIG# RECORDED BY / Logging Eng. WITNESSED BY RUN NO. 1 2 COMMENTS: . 200 Ohm-m 55 Ohms 55 Ohms 100 22 Ohm-m 0 1in:20ft 100 API 0 Single Point Resistance 8" Normal Resistivity Depth Nat. Gamma Ray 0 -50 mV -250 16" Normal Resistivity Spontaneous Potential 200 Ohm-m 0 20 Inches 10 64" Normal Resistivity 3-Arm Caliper 200 Ohm-m 0 20 Inches 10 64" Normal Resistivity 3-Arm Caliper 200 Ohm-m 0 -50 mV -250 16" Normal Resistivity Spontaneous Potential 100 22 Ohm-m 0 1in:20ft 100 API 0 Single Point Resistance 8" Normal Resistivity Depth Nat. Gamma Ray MW-04/TB-5 0 20 40 60 80 100 120 140 160 180 200 220 240 260 280 300 320 340 360 380 400 420 440 460 480 500 520 540 560 580 600 620 640 660 680 700 720 740 760 PERMANENT DATUM LOG MEAS. FROM DRILLING MEAS. FROM TB-5 COMPANY AMEC CONSULTANTS CAVE CREEK ARIZONA WELL ID FIELD MARICOPA STATE COUNTY RGE OTHER SERVICES CALIPER TWP K.B. D.F. FRESH MUD G.L. FULL N/A N/A 0.2 FT TRUCK #400 MSI-2PEA-F 1315 FROM SURFACE TO 20 FT 1745 TYPE OF LOGS: E-LOGS-GAMMA RAY MORE: LOCATION SEC ELEVATION CASING RECORD SIZE WGT. 14" SAMPLE INTERVAL LOGGING TRUCK TOOL STRING/SN LOG TIME: ON SITE/OFF SITE TYPE FLUID IN HOLE SALINITY DENSITY LEVEL MAX. REC. TEMP. IMAGE ORIENTED TO: ABOVE PERM. DATUM TO TOTAL DEPTH D. JACOVITCH/D.ECKMAN AMEC-MARK, KAREN 10-23-10 1 E-LOGS-GAMMA-CALIPER 768 FT 764 FT 764 FT SURFACE LAYNE GROUND LEVEL BOREHOLE RECORD BIT FROM 12 1/4" 20 FT DATE RUN No TYPE LOG DEPTH-DRILLER DEPTH-LOGGER BTM LOGGED INTERVAL TOP LOGGED INTERVAL DRILLER / RIG# RECORDED BY / Logging Eng. WITNESSED BY RUN NO. 1 2 COMMENTS: . 200 Ohm-m 55 Ohms 55 Ohms 100 22 Ohm-m 0 1in:20ft 100 API 0 Single Point Resistance 8" Normal Resistivity Depth Nat. Gamma Ray 0 -50 mV -250 16" Normal Resistivity Spontaneous Potential 200 Ohm-m 0 20 Inches 10 64" Normal Resistivity 3-Arm Caliper 200 Ohm-m 0 20 Inches 10 64" Normal Resistivity 3-Arm Caliper 200 Ohm-m 0 -50 mV -250 16" Normal Resistivity Spontaneous Potential 100 22 Ohm-m 0 1in:20ft 100 API 0 Single Point Resistance 8" Normal Resistivity Depth Nat. Gamma Ray MW-04/TB-5 0 20 40 60 80 100 120 140 160 180 200 220 240 260 280 300 320 340 360 380 400 420 440 460 480 500 520 540 560 580 600 620 640 660 680 700 720 740 760 PERMANENT DATUM LOG MEAS. FROM DRILLING MEAS. FROM TB-5 COMPANY AMEC CONSULTANTS CAVE CREEK ARIZONA WELL ID FIELD MARICOPA STATE COUNTY RGE OTHER SERVICES CALIPER TWP K.B. D.F. FRESH MUD G.L. FULL N/A N/A 0.2 FT TRUCK #400 MSI-2PEA-F 1315 FROM SURFACE TO 20 FT 1745 TYPE OF LOGS: E-LOGS-GAMMA RAY MORE: LOCATION SEC ELEVATION CASING RECORD SIZE WGT. 14" SAMPLE INTERVAL LOGGING TRUCK TOOL STRING/SN LOG TIME: ON SITE/OFF SITE TYPE FLUID IN HOLE SALINITY DENSITY LEVEL MAX. REC. TEMP. IMAGE ORIENTED TO: ABOVE PERM. DATUM TO TOTAL DEPTH D. JACOVITCH/D.ECKMAN AMEC-MARK, KAREN 10-23-10 1 E-LOGS-GAMMA-CALIPER 768 FT 764 FT 764 FT SURFACE LAYNE GROUND LEVEL BOREHOLE RECORD BIT FROM 12 1/4" 20 FT DATE RUN No TYPE LOG DEPTH-DRILLER DEPTH-LOGGER BTM LOGGED INTERVAL TOP LOGGED INTERVAL DRILLER / RIG# RECORDED BY / Logging Eng. WITNESSED BY RUN NO. 1 2 COMMENTS: . 200 Ohm-m 55 Ohms 55 Ohms 100 22 Ohm-m 0 1in:20ft 100 API 0 Single Point Resistance 8" Normal Resistivity Depth Nat. Gamma Ray 0 -50 mV -250 16" Normal Resistivity Spontaneous Potential 200 Ohm-m 0 20 Inches 10 64" Normal Resistivity 3-Arm Caliper 200 Ohm-m 0 20 Inches 10 64" Normal Resistivity 3-Arm Caliper 200 Ohm-m 0 -50 mV -250 16" Normal Resistivity Spontaneous Potential 100 22 Ohm-m 0 1in:20ft 100 API 0 Single Point Resistance 8" Normal Resistivity Depth Nat. Gamma Ray MW-04/TB-5 0 20 40 60 80 100 120 140 160 180 200 220 240 260 280 300 320 340 360 380 400 420 440 460 480 500 520 540 560 580 600 620 640 660 680 700 720 740 760 PERMANENT DATUM LOG MEAS. FROM DRILLING MEAS. FROM TB-5 COMPANY AMEC CONSULTANTS CAVE CREEK ARIZONA WELL ID FIELD MARICOPA STATE COUNTY RGE OTHER SERVICES CALIPER TWP K.B. D.F. FRESH MUD G.L. FULL N/A N/A 0.2 FT TRUCK #400 MSI-2PEA-F 1315 FROM SURFACE TO 20 FT 1745 TYPE OF LOGS: E-LOGS-GAMMA RAY MORE: LOCATION SEC ELEVATION CASING RECORD SIZE WGT. 14" SAMPLE INTERVAL LOGGING TRUCK TOOL STRING/SN LOG TIME: ON SITE/OFF SITE TYPE FLUID IN HOLE SALINITY DENSITY LEVEL MAX. REC. TEMP. IMAGE ORIENTED TO: ABOVE PERM. DATUM TO TOTAL DEPTH D. JACOVITCH/D.ECKMAN AMEC-MARK, KAREN 10-23-10 1 E-LOGS-GAMMA-CALIPER 768 FT 764 FT 764 FT SURFACE LAYNE GROUND LEVEL BOREHOLE RECORD BIT FROM 12 1/4" 20 FT DATE RUN No TYPE LOG DEPTH-DRILLER DEPTH-LOGGER BTM LOGGED INTERVAL TOP LOGGED INTERVAL DRILLER / RIG# RECORDED BY / Logging Eng. WITNESSED BY RUN NO. 1 2 COMMENTS: . 200 Ohm-m 55 Ohms 55 Ohms 100 22 Ohm-m 0 1in:20ft 100 API 0 Single Point Resistance 8" Normal Resistivity Depth Nat. Gamma Ray 0 -50 mV -250 16" Normal Resistivity Spontaneous Potential 200 Ohm-m 0 20 Inches 10 64" Normal Resistivity 3-Arm Caliper 200 Ohm-m 0 20 Inches 10 64" Normal Resistivity 3-Arm Caliper 200 Ohm-m 0 -50 mV -250 16" Normal Resistivity Spontaneous Potential 100 22 Ohm-m 0 1in:20ft 100 API 0 Single Point Resistance 8" Normal Resistivity Depth Nat. Gamma Ray MW-04/TB-5 0 20 40 60 80 100 120 140 160 180 200 220 240 260 280 300 320 340 360 380 400 420 440 460 480 500 520 540 560 580 600 620 640 660 680 700 720 740 760 740 760 3-Arm Caliper 10 Inches 64" Normal Resistivity 20 0 Spontaneous Potential -250 0 mV -50 API 100 Nat. Gamma Ray Depth 1in:20ft 0 0 Ohm-m 200 16" Normal Resistivity 8" Normal Resistivity Ohm-m Ohm-m 100 22 Single Point Resistance Ohms 200 55 PERMANENT DATUM LOG MEAS. FROM TB-4 (MW-5) COMPANY AMEC CONSULTANTS CAVE CREEK ARIZONA WELL ID FIELD MARICOPA STATE COUNTY RGE FULL N/A N/A .2 FT FRESH MUD G.L. D.F. K.B. OTHER SERVICES CALIPER TWP ELEVATION ABOVE PERM. DATUM TYPE FLUID IN HOLE SALINITY DENSITY LEVEL MAX. REC. TEMP. IMAGE ORIENTED TO: TRUCK #400 MSI-2PEA-F 1300 FROM SURFACE SAMPLE INTERVAL LOGGING TRUCK TOOL STRING/SN LOG TIME: ON SITE/OFF SITE CASING RECORD SIZE WGT. 14" TO 20 FT 1530 TYPE OF LOGS: E-LOGS-GAMMA RAY MORE: LOCATION SEC GROUND LEVEL 12-10-2010 1 E-LOGS-GAMMA-CALIPER 767 FT 744 FT 744 FT SURFACE LAYNE C. NEFF /D.ECKMAN AMEC-KAREN TO TOTAL DEPTH 60 DRILLING MEAS. FROM BOREHOLE RECORD BIT FROM 12 1/4" 20 FT DATE RUN No TYPE LOG DEPTH-DRILLER DEPTH-LOGGER BTM LOGGED INTERVAL TOP LOGGED INTERVAL DRILLER / RIG# RECORDED BY / Logging Eng. WITNESSED BY RUN NO. 1 2 COMMENTS: . 40 200 Inches 0 20 Ohm-m 0 200 20 0 Ohm-m 0 -400 mV 0 64" Normal Resistivity 3-Arm Caliper 80 100 30 Ohms 16" Normal Resistivity Ohm-m 0 200 1in:20ft API Spontaneous Potential 0 Single Point Resistance 8" Normal Resistivity Depth Nat. Gamma Ray MW-05/TB-4 80 100 120 140 160 180 200 220 240 260 280 300 320 340 360 380 400 420 440 460 480 500 520 540 560 580 600 620 640 660 680 700 720 740 3-Arm Caliper 0 Inches 64" Normal Resistivity 20 0 Spontaneous Potential -400 0 mV 0 API 200 Nat. Gamma Ray Depth 1in:20ft 0 0 Ohm-m 200 16" Normal Resistivity 8" Normal Resistivity Ohm-m Ohm-m 100 30 Single Point Resistance Ohms 200 80 PERMANENT DATUM TB-2 COMPANY AMEC CONSULTANTS CAVE CREEK ARIZONA WELL ID FIELD MARICOPA STATE COUNTY RGE OTHER SERVICES CALIPER TWP ELEVATION ABOVE PERM. DATUM D.F. K.B. TYPE OF LOGS: E-LOGS-GAMMA RAY MORE: LOCATION SEC GROUND LEVEL FRESH MUD 40.0 G.L. FULL N/A N/A .2 FT 20.0 LOG MEAS. FROM TYPE FLUID IN HOLE SALINITY DENSITY LEVEL MAX. REC. TEMP. IMAGE ORIENTED TO: TO 20 FT TRUCK #107 MSI-2PEA-F, COMPROBE 2 1/8" 1430 1200 FROM SURFACE SAMPLE INTERVAL LOGGING TRUCK TOOL STRING/SN LOG TIME: ON SITE/OFF SITE CASING RECORD SIZE WGT. 14" 3-arm Caliper DRILLING MEAS. FROM 5-1-11 1 E-LOGS-GAMMA-CALIPER 770 FT 777 FT 777 FT SURFACE YELLOW JACKET TO 20FT TOTALDEPTH D.ECKMAN AMEC-SHANDA WAGNER BOREHOLE RECORD BIT FROM ? SURFACE 10 5/8" 20 FT DATE RUN No TYPE LOG DEPTH-DRILLER DEPTH-LOGGER BTM LOGGED INTERVAL TOP LOGGED INTERVAL DRILLER / RIG# RECORDED BY / Logging Eng. WITNESSED BY RUN NO. 1 2 0.0 20 Inches 10 35 Deg C 25 COMMENTS: . Temperature 200 Ohm-m 0 10 Ohm-m 0 64" Normal Resistivity Fluid Resistivity 200 Ohm-m 0 -450 mV -650 16" Normal Resistivity Spontaneous Potential 60 ohms 100 10 Ohm-m 0 1in:20ft 100 API 0 Single Point Resistance 8" Normal Resistivity Depth Natural Gamma Ray MW-06/TB-2 60.0 80.0 100.0 120.0 140.0 160.0 180.0 200.0 220.0 240.0 260.0 280.0 300.0 320.0 340.0 360.0 380.0 400.0 420.0 440.0 460.0 480.0 500.0 520.0 540.0 560.0 580.0 600.0 620.0 640.0 660.0 680.0 700.0 720.0 740.0 760.0 780.0 3-arm Caliper 10 Inches 20 Temperature 25 Deg C 35 Fluid Resistivity 0 Ohm-m 64" Normal Resistivity 10 0 Ohm-m Spontaneous Potential -650 mV 16" Normal Resistivity -450 Natural Gamma Ray 0 API 200 0 Depth 100 1in:20ft Ohm-m 8" Normal Resistivity 0 Ohm-m 200 Single Point Resistance 100 10 ohms 60 PERMANENT DATUM MW-7 CAVE CREEK RGE STATE D.F. K.B. OTHER SERVICES NONE ARIZONA COMPANY AMEC EARTH AND ENVIRONMENTAL FIELD MARICOPA WELL ID COUNTY TWP TYPE OF LOGS: GAMMA, E-LOGS MORE: 3-ARM CALIPER LOCATION SEC ELEVATION ABOVE PERM. DATUM FRESH MUD G.L. FULL N/A N/A .2 FT TO 20 FT 40.0 GROUND LEVEL TYPE FLUID IN HOLE SALINITY DENSITY LEVEL MAX. REC. TEMP. IMAGE ORIENTED TO: TRUCK #400 2PEA/F, 2PCA 1100 FROM SURFACE SAMPLE INTERVAL LOGGING TRUCK TOOL STRING/SN LOG TIME: ON SITE/OFF SITE CASING RECORD SIZE WGT. 14" 20.0 LOG MEAS. FROM 2-3-2012 1 GAMMA-ELOG-CAL 765 FT 763.5 FT 763.5 FT SURFACE YELLOW JACKET E. TURNER AMEC TO 20 FT TOTAL DEPTH Fluid Resistivity DRILLING MEAS. FROM BOREHOLE RECORD BIT FROM 20 " 0 12 3/4" 20 FT DATE RUN No TYPE LOG DEPTH-DRILLER DEPTH-LOGGER BTM LOGGED INTERVAL TOP LOGGED INTERVAL DRILLER / RIG# RECORDED BY / Logging Eng. WITNESSED BY RUN NO. 1 2 10 Ohm-m 0 35 Deg C 25 COMMENTS: . Temperature 200 Ohm-m 0 20 Inches 10 64" Normal Resistivity 3-arm Caliper 200 Ohm-m 0 -450 mV -650 16" Normal Resistivity Spontaneous Potential 60 ohms 100 10 Ohm-m 0 1in:20ft 100 API 0 Single Point Resistance 8" Normal Resistivity Depth Natural Gamma Ray MW-07/TB-1 60.0 80.0 100.0 120.0 140.0 160.0 180.0 200.0 220.0 240.0 260.0 280.0 300.0 320.0 340.0 360.0 380.0 400.0 420.0 440.0 460.0 480.0 500.0 520.0 540.0 560.0 580.0 600.0 620.0 640.0 660.0 680.0 700.0 720.0 740.0 760.0 Fluid Resistivity 0 Ohm-m 10 Temperature 25 Deg C 35 3-arm Caliper 10 Inches 64" Normal Resistivity 20 0 Ohm-m Spontaneous Potential -650 mV 16" Normal Resistivity -450 Natural Gamma Ray 0 API 200 0 Depth 100 1in:20ft Ohm-m 8" Normal Resistivity 0 Ohm-m 200 Single Point Resistance 100 10 ohms 60 PERMANENT DATUM FIELD WELL ID MARICOPA CAVE CREEK MW-8 COMPANY AMEC CONSULTANTS COUNTY TWP ABOVE PERM. DATUM ELEVATION RGE STATE TYPE OF LOGS: GAMMA, DUAL GUARD, MORE: CALIPER LOCATION SEC GROUND LEVEL TYPE FLUID IN HOLE SALINITY DENSITY LEVEL MAX. REC. TEMP. IMAGE ORIENTED TO: ARIZONA OTHER SERVICES SONIC K.B. D.F. FRESH MUD G.L. N/A N/A N/A .2 FT TO 19 FT TRUCK #400 2PCA, GEOVISTA, COMPPROBE 1800 0729 FROM SURFACE SAMPLE INTERVAL LOGGING TRUCK TOOL STRING/SN LOG TIME: ON SITE/OFF SITE CASING RECORD SIZE WGT. 16" 60 LOG MEAS. FROM 1-06-2012 1 GAMMA, GUARD CALIPER 765 FT 766 FT 766 FT SURFACE YELLOW JACKET C. NEFF AMEC TO 20 FT TOTAL DEPTH 40 DRILLING MEAS. FROM BOREHOLE RECORD BIT FROM 20 " 0 14 3/4" 20 FT DATE RUN No TYPE LOG DEPTH-DRILLER DEPTH-LOGGER BTM LOGGED INTERVAL TOP LOGGED INTERVAL DRILLER / RIG# RECORDED BY / Logging Eng. WITNESSED BY RUN NO. 1 2 COMMENTS: E-LOG NOT OPERATIONAL. USED DUAL GUARD AND GAMMA-NEUTRON AS REPRESENTATIVE LOG . 20 150 Ohm.m 0 20 Inches 0 RLLD 3-Arm Caliper 100 Ohm.m 0 1in:20ft 100 API 0 RLLS Depth Nat Gamma Ray MW-08 80 100 120 140 160 180 200 220 240 260 280 300 320 340 360 380 400 420 440 460 480 500 520 540 560 580 600 620 640 660 680 700 720 740 760 3-Arm Caliper 0 Inches RLLD 20 Nat Gamma Ray 0 API 0 Depth 100 1in:20ft Ohm.m 150 RLLS 0 Ohm.m 100 PERMANENT DATUM WELL ID CAVE CREEK MW-8 ARIZONA COMPANY AMEC CONSULTANTS FIELD MARICOPA STATE COUNTY RGE OTHER SERVICES GAMMA DUAL GUARD TWP ELEVATION ABOVE PERM. DATUM N/A N/A N/A .2 FT FRESH MUD G.L. D.F. K.B. TYPE OF LOGS: 60mm SONIC-CALIPER MORE: LOCATION SEC GROUND LEVEL TYPE FLUID IN HOLE SALINITY DENSITY LEVEL MAX. REC. TEMP. IMAGE ORIENTED TO: TO 19 FT TRUCK #400 MSI FWS, 2CAA 0720 1800 FROM SURFACE SAMPLE INTERVAL LOGGING TRUCK TOOL STRING/SN LOG TIME: ON SITE/OFF SITE CASING RECORD SIZE WGT. 16" 60 LOG MEAS. FROM 1-06-2012 1 60mm SONIC, CALIPER 765 FT 761 FT 761 FT 20 FT YELLOW JACKET C. NEFF AMEC TO 20 FT TOTAL DEPTH 40 DRILLING MEAS. FROM BOREHOLE RECORD BIT FROM 20 " 0 20 FT 14 3/4" DATE RUN No TYPE LOG DEPTH-DRILLER DEPTH-LOGGER BTM LOGGED INTERVAL TOP LOGGED INTERVAL DRILLER / RIG# RECORDED BY / Logging Eng. WITNESSED BY RUN NO. 1 2 COMMENTS: SONIC USED TO DETERMINE STATIC WATER LEVEL . 20 1100 uSec 1000 200 uSec 200 0 40 uSec 240 RX2 - Travel Time RX1-Travel Time Delta T 1000 uSec 1000 200 uSec 200 1in:20ft 20 Inches 0 RX2-Sonic VDL RX1-Sonic VDL Depth 3-Arm Caliper MW-08 (sonic) 80 100 120 140 160 180 200 220 240 260 280 300 320 340 360 380 400 420 440 460 480 500 520 540 560 580 600 620 640 660 680 700 720 740 760 Delta T 240 uSec RX1-Travel Time 40 3-Arm Caliper 0 Inches 200 Depth 20 1in:20ft uSec RX2 - Travel Time 1000 200 RX1-Sonic VDL 200 uSec uSec 1100 RX2-Sonic VDL 1000 200 uSec 1000 APPENDIX C WELL CONSTRUCTION LOGS APPENDIX D GROUNDWATER ELEVATION DATA Appendix D. Groundwater Elevation Data Well Name TOC (ft amsl) Cave Creek Landfill, Maricopa County Sample Date Depth to Water (ft bgs) Water Level Elevation (ft amsl) Pump Intake Elevation (ft amsl) Depth of Water Above Pump (ft below top of water table) 4/18/2003 703.0 1,895.6 1,192.6 1,200.6 3/2/2005 716.9 1,895.6 1,178.7 1,200.6 - 3/9/2005 716.7 1,895.6 1,179.0 1,155.6 23.4 3/21/2005 713.8 1,895.6 1,181.8 1,155.6 26.2 4/8/2005 702.8 1,895.6 1,192.8 1,155.6 37.2 6/1/2005 715.8 1,895.6 1,179.8 1,155.6 24.2 6/14/2005 719.0 1,895.6 1,176.6 1,155.6 21.0 6/30/2005 719.0 1,895.6 1,176.6 1,155.6 21.0 7/7/2005 719.1 1,895.6 1,176.5 1,155.6 20.9 7/14/2005 719.1 1,895.6 1,176.5 1,155.6 20.9 7/21/2005 717.7 1,895.6 1,177.9 1,155.6 22.3 7/28/2005 717.1 1,895.6 1,178.6 1,155.6 22.9 8/5/2005 714.3 1,895.6 1,181.4 1,155.6 25.8 8/12/2005 714.3 1,895.6 1,181.4 1,155.6 25.8 8/19/2005 715.9 1,895.6 1,179.7 1,155.6 24.1 8/26/2005 711.6 1,895.6 1,184.0 1,155.6 28.4 9/2/2005 710.4 1,895.6 1,185.3 1,155.6 29.6 9/8/2005 708.6 1,895.6 1,187.0 1,155.6 31.4 9/15/2005 708.0 1,895.6 1,187.6 1,155.6 32.0 9/22/2005 707.0 1,895.6 1,188.6 1,155.6 33.0 9/29/2005 706.3 1,895.6 1,189.3 1,155.6 33.7 10/6/2005 706.2 1,895.6 1,189.5 1,155.6 33.8 10/13/2005 705.9 1,895.6 1,189.8 1,155.6 34.1 10/20/2005 719.6 1,895.6 1,176.0 1,155.6 20.4 10/20/2005 719.6 1,895.6 1,176.0 1,155.6 20.4 10/27/2005 719.6 1,895.6 1,176.0 1,155.6 20.4 10/27/2005 719.6 1,895.6 1,176.0 1,155.6 20.4 11/3/2005 719.6 1,895.6 1,176.0 1,155.6 20.4 11/3/2005 719.6 1,895.6 1,176.0 1,155.6 20.4 11/10/2005 719.8 1,895.6 1,175.8 1,155.6 20.2 11/10/2005 719.8 1,895.6 1,175.8 1,155.6 20.2 12/8/2005 718.9 1,895.6 1,176.7 1,155.6 21.1 12/8/2005 718.9 1,895.6 1,176.7 1,155.6 21.1 1/12/2006 718.0 1,895.6 1,177.6 1,155.6 22.0 1/12/2006 718.0 1,895.6 1,177.6 1,155.6 22.0 2/10/2006 720.2 1,895.6 1,175.4 1,155.6 19.8 2/10/2006 720.2 1,895.6 1,175.4 1,155.6 19.8 3/10/2006 720.2 1,895.6 1,175.5 1,155.6 19.9 3/10/2006 720.2 1,895.6 1,175.5 1,155.6 19.9 4/13/2006 720.5 1,895.6 1,175.2 1,155.6 19.6 4/13/2006 720.5 1,895.6 1,175.2 1,155.6 19.6 5/9/2006 720.6 1,895.6 1,175.0 1,155.6 19.4 5/9/2006 720.6 1,895.6 1,175.0 1,155.6 19.4 6/20/2006 720.3 1,895.6 1,175.4 1,155.6 19.8 6/20/2006 720.3 1,895.6 1,175.4 1,155.6 19.8 7/13/2006 720.3 1,895.6 1,175.3 1,155.6 19.7 7/13/2006 720.3 1,895.6 1,175.3 1,155.6 19.7 8/16/2006 721.0 1,895.6 1,174.6 1,155.6 19.0 8/16/2006 721.0 1,895.6 1,174.6 1,155.6 19.0 9/19/2006 720.4 1,895.6 1,175.2 1,155.6 19.6 MW-01 Monday, November 19, 2012 - Page 1 of 12 Appendix D. Groundwater Elevation Data Well Name Sample Date Depth to Water (ft bgs) TOC (ft amsl) Cave Creek Landfill, Maricopa County Water Level Elevation (ft amsl) Pump Intake Elevation (ft amsl) Depth of Water Above Pump (ft below top of water table) MW-01 9/19/2006 720.4 1,895.6 1,175.2 1,155.6 19.6 10/13/2006 721.1 1,895.6 1,174.5 1,155.6 18.9 10/13/2006 721.1 1,895.6 1,174.5 1,155.6 18.9 11/13/2006 724.2 1,895.6 1,171.4 1,155.6 15.8 11/13/2006 724.2 1,895.6 1,171.4 1,155.6 15.8 12/13/2006 721.8 1,895.6 1,173.9 1,155.6 18.3 12/13/2006 721.8 1,895.6 1,173.9 1,155.6 18.3 1/18/2007 722.1 1,895.6 1,173.6 1,155.6 17.9 1/18/2007 722.1 1,895.6 1,173.6 1,155.6 17.9 2/21/2007 722.6 1,895.6 1,173.1 1,155.6 17.4 2/21/2007 722.6 1,895.6 1,173.1 1,155.6 17.4 3/20/2007 722.8 1,895.6 1,172.9 1,155.6 17.2 3/20/2007 722.8 1,895.6 1,172.9 1,155.6 17.2 4/16/2007 723.0 1,895.6 1,172.7 1,155.6 17.0 4/16/2007 723.0 1,895.6 1,172.7 1,155.6 17.0 5/22/2007 723.2 1,895.6 1,172.4 1,155.6 16.8 5/22/2007 723.2 1,895.6 1,172.4 1,155.6 16.8 6/12/2007 723.6 1,895.6 1,172.1 1,155.6 16.4 6/12/2007 723.6 1,895.6 1,172.1 1,155.6 16.4 7/18/2007 723.6 1,895.6 1,172.0 1,155.6 16.4 7/18/2007 723.6 1,895.6 1,172.0 1,155.6 16.4 4/12/2001 680.0 1,856.0 1,176.0 1,181.0 - 5/23/2001 680.0 1,856.0 1,176.0 1,181.0 - 9/21/2001 658.0 1,856.0 1,198.0 1,181.0 17.0 10/2/2001 675.0 1,856.0 1,181.0 1,181.0 - 1/28/2002 675.0 1,856.0 1,181.0 1,181.0 - 3/22/2002 675.0 1,856.0 1,181.0 1,181.0 - 4/18/2003 670.0 1,856.0 1,186.0 1,181.0 5.0 7/17/2003 673.0 1,856.0 1,183.0 1,181.0 2.0 1/12/2004 673.0 1,856.0 1,183.0 1,181.0 2.0 3/17/2004 676.5 1,856.0 1,179.5 1,181.0 - 4/23/2004 676.5 1,856.0 1,179.5 1,181.0 - 3/2/2005 677.7 1,856.0 1,178.4 1,152.0 26.3 3/9/2005 679.9 1,856.0 1,176.1 1,152.0 24.1 3/21/2005 675.3 1,856.0 1,180.7 1,152.0 28.7 4/8/2005 665.8 1,856.0 1,190.2 1,152.0 38.2 MW-02 6/1/2005 678.3 1,856.0 1,177.7 1,152.0 25.7 6/14/2005 681.6 1,856.0 1,174.4 1,152.0 22.4 6/30/2005 680.5 1,856.0 1,175.5 1,152.0 23.5 7/7/2005 680.7 1,856.0 1,175.3 1,152.0 23.3 7/14/2005 680.8 1,856.0 1,175.3 1,152.0 23.2 7/21/2005 679.3 1,856.0 1,176.8 1,152.0 24.8 7/28/2005 678.7 1,856.0 1,177.3 1,152.0 25.3 8/5/2005 675.1 1,856.0 1,180.9 1,152.0 28.9 8/12/2005 675.3 1,856.0 1,180.8 1,152.0 28.8 8/19/2005 678.6 1,856.0 1,177.5 1,152.0 25.4 8/26/2005 674.0 1,856.0 1,182.0 1,152.0 30.0 9/2/2005 671.7 1,856.0 1,184.4 1,152.0 32.3 9/8/2005 671.4 1,856.0 1,184.6 1,152.0 32.6 Monday, November 19, 2012 Page 2 of 12 Appendix D. Groundwater Elevation Data Well Name TOC (ft amsl) Cave Creek Landfill, Maricopa County Sample Date Depth to Water (ft bgs) Water Level Elevation (ft amsl) Pump Intake Elevation (ft amsl) Depth of Water Above Pump (ft below top of water table) 9/15/2005 671.3 1,856.0 1,184.7 1,152.0 32.7 9/22/2005 670.4 1,856.0 1,185.6 1,152.0 33.6 9/29/2005 669.9 1,856.0 1,186.2 1,152.0 34.1 MW-02 10/6/2005 670.0 1,856.0 1,186.1 1,152.0 34.1 10/13/2005 669.6 1,856.0 1,186.4 1,152.0 34.4 10/20/2005 681.3 1,856.0 1,174.7 1,152.0 22.7 10/20/2005 681.3 1,856.0 1,174.7 1,152.0 22.7 10/27/2005 681.3 1,856.0 1,174.7 1,152.0 22.7 10/27/2005 681.3 1,856.0 1,174.7 1,152.0 22.7 11/3/2005 681.3 1,856.0 1,174.8 1,152.0 22.8 11/3/2005 681.3 1,856.0 1,174.8 1,152.0 22.8 11/10/2005 681.5 1,856.0 1,174.6 1,152.0 22.6 11/10/2005 681.5 1,856.0 1,174.6 1,152.0 22.6 12/8/2005 680.8 1,856.0 1,175.2 1,152.0 23.2 12/8/2005 680.8 1,856.0 1,175.2 1,152.0 23.2 1/12/2006 681.8 1,856.0 1,174.2 1,152.0 22.2 1/12/2006 681.8 1,856.0 1,174.2 1,152.0 22.2 2/10/2006 682.0 1,856.0 1,174.0 1,152.0 22.0 2/10/2006 682.0 1,856.0 1,174.0 1,152.0 22.0 3/10/2006 681.9 1,856.0 1,174.2 1,152.0 22.2 3/10/2006 681.9 1,856.0 1,174.2 1,152.0 22.2 4/13/2006 682.2 1,856.0 1,173.8 1,152.0 21.8 4/13/2006 682.2 1,856.0 1,173.8 1,152.0 21.8 5/9/2006 682.4 1,856.0 1,173.7 1,152.0 21.7 5/9/2006 682.4 1,856.0 1,173.7 1,152.0 21.7 6/20/2006 682.5 1,856.0 1,173.5 1,152.0 21.5 6/20/2006 682.5 1,856.0 1,173.5 1,152.0 21.5 7/13/2006 682.6 1,856.0 1,173.5 1,152.0 21.5 7/13/2006 682.6 1,856.0 1,173.5 1,152.0 21.5 8/16/2006 683.2 1,856.0 1,172.8 1,152.0 20.8 8/16/2006 683.2 1,856.0 1,172.8 1,152.0 20.8 9/19/2006 682.2 1,856.0 1,173.9 1,152.0 21.9 9/19/2006 682.2 1,856.0 1,173.9 1,152.0 21.9 10/13/2006 683.6 1,856.0 1,172.4 1,152.0 20.4 10/13/2006 683.6 1,856.0 1,172.4 1,152.0 20.4 11/13/2006 689.4 1,856.0 1,166.6 1,152.0 14.6 11/13/2006 689.4 1,856.0 1,166.6 1,152.0 14.6 12/13/2006 684.1 1,856.0 1,171.9 1,152.0 19.9 12/13/2006 684.1 1,856.0 1,171.9 1,152.0 19.9 1/18/2007 683.9 1,856.0 1,172.2 1,152.0 20.2 1/18/2007 683.9 1,856.0 1,172.2 1,152.0 20.2 2/21/2007 684.7 1,856.0 1,171.3 1,152.0 19.3 2/21/2007 684.7 1,856.0 1,171.3 1,152.0 19.3 3/20/2007 684.8 1,856.0 1,171.2 1,152.0 19.2 3/20/2007 684.8 1,856.0 1,171.2 1,152.0 19.2 4/16/2007 685.1 1,856.0 1,170.9 1,152.0 18.9 4/16/2007 685.1 1,856.0 1,170.9 1,152.0 18.9 5/22/2007 685.4 1,856.0 1,170.7 1,152.0 18.6 5/22/2007 685.4 1,856.0 1,170.7 1,152.0 18.6 6/12/2007 685.7 1,856.0 1,170.3 1,152.0 18.3 Monday, November 19, 2012 Page 3 of 12 Appendix D. Groundwater Elevation Data Well Name TOC (ft amsl) Cave Creek Landfill, Maricopa County Sample Date Depth to Water (ft bgs) Water Level Elevation (ft amsl) Pump Intake Elevation (ft amsl) Depth of Water Above Pump (ft below top of water table) 6/12/2007 685.7 1,856.0 1,170.3 1,152.0 18.3 7/18/2007 686.0 1,856.0 1,170.1 1,152.0 18.0 7/18/2007 686.0 1,856.0 1,170.1 1,152.0 18.0 9/18/2007 686.4 1,856.0 1,169.6 1,152.0 17.6 9/18/2007 686.4 1,856.0 1,169.6 1,152.0 17.6 10/24/2007 686.9 1,856.0 1,169.2 1,152.0 17.1 10/24/2007 686.9 1,856.0 1,169.2 1,152.0 17.1 11/16/2007 687.1 1,856.0 1,168.9 1,152.0 16.9 11/16/2007 687.1 1,856.0 1,168.9 1,152.0 16.9 12/19/2007 687.4 1,856.0 1,168.6 1,152.0 16.6 12/19/2007 687.4 1,856.0 1,168.6 1,152.0 16.6 1/12/2008 687.8 1,856.0 1,168.2 1,152.0 16.2 1/12/2008 687.8 1,856.0 1,168.2 1,152.0 16.2 2/20/2008 687.8 1,856.0 1,168.2 1,152.0 16.2 2/20/2008 687.8 1,856.0 1,168.2 1,152.0 16.2 3/12/2008 687.8 1,856.0 1,168.2 1,152.0 16.2 3/12/2008 687.8 1,856.0 1,168.2 1,152.0 16.2 4/16/2008 688.5 1,856.0 1,167.5 1,152.0 15.5 4/16/2008 688.5 1,856.0 1,167.5 1,152.0 15.5 5/20/2008 688.1 1,856.0 1,167.9 1,152.0 15.9 5/20/2008 688.1 1,856.0 1,167.9 1,152.0 15.9 6/16/2008 688.0 1,856.0 1,168.0 1,152.0 16.0 6/16/2008 688.0 1,856.0 1,168.0 1,152.0 16.0 7/18/2008 689.0 1,856.0 1,167.0 1,152.0 15.0 7/18/2008 689.0 1,856.0 1,167.0 1,152.0 15.0 8/13/2008 688.9 1,856.0 1,167.1 1,152.0 15.1 8/13/2008 688.9 1,856.0 1,167.1 1,152.0 15.1 9/15/2008 687.6 1,856.0 1,168.4 1,152.0 16.4 9/15/2008 687.6 1,856.0 1,168.4 1,152.0 16.4 10/16/2008 689.0 1,856.0 1,167.0 1,152.0 15.0 10/16/2008 689.0 1,856.0 1,167.0 1,152.0 15.0 11/14/2008 689.0 1,856.0 1,167.0 1,152.0 15.0 11/14/2008 689.0 1,856.0 1,167.0 1,152.0 15.0 12/12/2008 688.0 1,856.0 1,168.0 1,152.0 16.0 12/12/2008 688.0 1,856.0 1,168.0 1,152.0 16.0 1/13/2009 688.5 1,856.0 1,167.5 1,152.0 15.5 1/13/2009 688.5 1,856.0 1,167.5 1,152.0 15.5 2/12/2009 690.2 1,856.0 1,165.8 1,152.0 13.8 2/12/2009 690.2 1,856.0 1,165.8 1,152.0 13.8 3/12/2009 690.4 1,856.0 1,165.6 1,152.0 13.6 3/12/2009 690.4 1,856.0 1,165.6 1,152.0 13.6 7/15/2009 690.8 1,856.0 1,165.2 1,142.0 23.2 7/15/2009 690.8 1,856.0 1,165.2 1,142.0 23.2 8/14/2009 691.0 1,856.0 1,165.0 1,142.0 23.0 MW-02 9/17/2009 691.2 1,856.0 1,164.8 1,142.0 22.8 10/15/2009 691.4 1,856.0 1,164.6 1,142.0 22.6 11/12/2009 691.4 1,856.0 1,164.6 1,142.0 22.6 12/11/2009 691.6 1,856.0 1,164.4 1,142.0 22.4 1/13/2010 691.7 1,856.0 1,164.4 1,142.0 22.4 2/17/2010 690.0 1,856.0 1,166.0 1,142.0 24.0 Monday, November 19, 2012 Page 4 of 12 Appendix D. Groundwater Elevation Data Well Name TOC (ft amsl) Cave Creek Landfill, Maricopa County Sample Date Depth to Water (ft bgs) Water Level Elevation (ft amsl) Pump Intake Elevation (ft amsl) Depth of Water Above Pump (ft below top of water table) 3/10/2010 692.1 1,856.0 1,163.9 1,142.0 21.9 4/16/2010 692.3 1,856.0 1,163.7 1,142.0 21.7 5/20/2010 692.4 1,856.0 1,163.6 1,142.0 21.6 6/16/2010 692.2 1,856.0 1,163.9 1,142.0 21.9 7/20/2010 692.8 1,856.0 1,163.3 1,142.0 21.3 8/13/2010 692.7 1,856.0 1,163.3 1,142.0 21.3 9/13/2010 692.5 1,856.0 1,163.5 1,142.0 21.5 10/15/2010 692.8 1,856.0 1,163.3 1,142.0 21.3 11/16/2010 692.8 1,856.0 1,163.2 1,142.0 21.2 12/16/2010 692.8 1,856.0 1,163.3 1,142.0 21.3 1/11/2011 693.0 1,856.0 1,163.1 1,142.0 21.1 2/15/2011 692.9 1,856.0 1,163.2 1,142.0 21.1 3/9/2011 692.8 1,856.0 1,163.2 1,142.0 21.2 4/30/2011 692.7 1,856.0 1,163.3 1,142.0 21.3 4/30/2011 692.7 1,856.0 1,163.3 1,142.0 21.3 5/26/2011 692.7 1,856.0 1,163.4 1,142.0 21.4 5/26/2011 692.7 1,856.0 1,163.4 1,142.0 21.4 6/30/2011 692.8 1,856.0 1,163.2 1,142.0 21.2 7/12/2011 692.8 1,856.0 1,163.2 1,142.0 21.2 8/18/2011 692.9 1,856.0 1,163.1 1,142.0 21.1 9/16/2011 693.0 1,856.0 1,163.1 1,142.0 21.1 10/24/2011 693.0 1,856.0 1,163.1 1,142.0 21.0 11/22/2011 693.4 1,856.0 1,162.6 1,142.0 20.6 12/19/2011 693.2 1,856.0 1,162.8 1,142.0 20.8 1/30/2012 692.9 1,856.0 1,163.2 1,142.0 21.1 2/15/2012 693.1 1,856.0 1,162.9 1,142.0 20.9 3/14/2012 693.0 1,856.0 1,163.0 1,142.0 21.0 4/30/2012 692.7 1,856.0 1,163.4 1,142.0 21.3 5/8/2012 693.3 1,856.0 1,162.7 1,142.0 20.7 6/13/2012 693.3 1,856.0 1,162.7 1,142.0 20.7 7/23/2012 693.7 1,856.0 1,162.3 1,142.0 20.3 8/22/2012 693.5 1,856.0 1,162.5 1,142.0 20.5 9/17/2012 694.0 1,856.0 1,162.0 1,142.0 20.0 10/18/2012 694.1 1,856.0 1,161.9 1,142.0 19.9 2/20/2008 697.4 1,866.6 1,169.2 1,089.6 79.6 2/20/2008 697.4 1,866.6 1,169.2 1,089.6 79.6 3/12/2008 696.6 1,866.6 1,170.0 1,089.6 80.4 3/12/2008 696.6 1,866.6 1,170.0 1,089.6 80.4 4/16/2008 697.6 1,866.6 1,169.0 1,089.6 79.4 4/16/2008 697.6 1,866.6 1,169.0 1,089.6 79.4 5/20/2008 698.0 1,866.6 1,168.6 1,089.6 79.0 5/20/2008 698.0 1,866.6 1,168.6 1,089.6 79.0 6/16/2008 699.4 1,866.6 1,167.2 1,089.6 77.6 6/16/2008 699.4 1,866.6 1,167.2 1,089.6 77.6 7/18/2008 698.4 1,866.6 1,168.2 1,089.6 78.6 7/18/2008 698.4 1,866.6 1,168.2 1,089.6 78.6 8/13/2008 698.8 1,866.6 1,167.8 1,089.6 78.2 8/13/2008 698.8 1,866.6 1,167.8 1,089.6 78.2 9/15/2008 698.6 1,866.6 1,168.0 1,089.6 78.4 MW-02 MW-03 Monday, November 19, 2012 Page 5 of 12 Appendix D. Groundwater Elevation Data Well Name Sample Date Depth to Water (ft bgs) TOC (ft amsl) Cave Creek Landfill, Maricopa County Water Level Elevation (ft amsl) Pump Intake Elevation (ft amsl) Depth of Water Above Pump (ft below top of water table) MW-03 9/15/2008 698.6 1,866.6 1,168.0 1,089.6 78.4 10/16/2008 699.2 1,866.6 1,167.4 1,089.6 77.8 10/16/2008 699.2 1,866.6 1,167.4 1,089.6 77.8 11/14/2008 699.5 1,866.6 1,167.1 1,089.6 77.5 11/14/2008 699.5 1,866.6 1,167.1 1,089.6 77.5 12/12/2008 699.3 1,866.6 1,167.3 1,089.6 77.7 12/12/2008 699.3 1,866.6 1,167.3 1,089.6 77.7 1/13/2009 699.7 1,866.6 1,166.9 1,089.6 77.3 1/13/2009 699.7 1,866.6 1,166.9 1,089.6 77.3 2/12/2009 699.9 1,866.6 1,166.7 1,089.6 77.1 2/12/2009 699.9 1,866.6 1,166.7 1,089.6 77.1 3/12/2009 699.5 1,866.6 1,167.1 1,089.6 77.5 3/12/2009 699.5 1,866.6 1,167.1 1,089.6 77.5 7/15/2009 699.0 1,866.6 1,167.6 1,142.6 25.0 7/15/2009 699.0 1,866.6 1,167.6 1,142.6 25.0 8/14/2009 702.9 1,866.6 1,163.7 1,142.6 21.1 9/17/2009 701.1 1,866.6 1,165.5 1,142.6 22.9 10/15/2009 701.4 1,866.6 1,165.2 1,142.6 22.6 11/12/2009 701.2 1,866.6 1,165.4 1,142.6 22.8 12/11/2009 701.4 1,866.6 1,165.2 1,142.6 22.6 1/13/2010 699.9 1,866.6 1,166.7 1,142.6 24.1 2/17/2010 699.1 1,866.6 1,167.5 1,142.6 24.9 3/10/2010 702.2 1,866.6 1,164.4 1,142.6 21.8 4/16/2010 702.3 1,866.6 1,164.3 1,142.6 21.7 5/20/2010 702.4 1,866.6 1,164.2 1,142.6 21.6 6/16/2010 702.5 1,866.6 1,164.1 1,142.6 21.6 7/20/2010 702.6 1,866.6 1,164.0 1,142.6 21.4 8/13/2010 702.5 1,866.6 1,164.1 1,142.6 21.5 9/13/2010 702.8 1,866.6 1,163.8 1,142.6 21.3 10/15/2010 702.6 1,866.6 1,164.0 1,142.6 21.4 11/16/2010 702.5 1,866.6 1,164.1 1,142.6 21.5 12/16/2010 702.0 1,866.6 1,164.6 1,142.6 22.0 1/11/2011 702.6 1,866.6 1,164.0 1,142.6 21.4 2/15/2011 701.6 1,866.6 1,165.0 1,142.6 22.5 3/9/2011 702.5 1,866.6 1,164.1 1,142.6 21.6 4/30/2011 702.3 1,866.6 1,164.3 1,142.6 21.7 4/30/2011 702.3 1,866.6 1,164.3 1,142.6 21.7 5/26/2011 702.4 1,866.6 1,164.2 1,142.6 21.6 5/26/2011 702.4 1,866.6 1,164.2 1,142.6 21.6 6/30/2011 702.5 1,866.6 1,164.1 1,142.6 21.5 7/12/2011 702.5 1,866.6 1,164.1 1,142.6 21.5 8/18/2011 702.7 1,866.6 1,163.9 1,142.6 21.4 9/16/2011 702.6 1,866.6 1,163.9 1,142.6 21.4 10/24/2011 701.5 1,866.6 1,165.1 1,142.6 22.5 11/22/2011 703.2 1,866.6 1,163.4 1,142.6 20.9 12/19/2011 703.4 1,866.6 1,163.2 1,142.6 20.6 1/30/2012 692.9 1,866.6 1,173.7 1,142.6 31.1 2/15/2012 702.4 1,866.6 1,164.2 1,142.6 21.6 3/14/2012 702.9 1,866.6 1,163.7 1,142.6 21.2 4/30/2012 703.2 1,866.6 1,163.4 1,142.6 20.8 Monday, November 19, 2012 Page 6 of 12 Appendix D. Groundwater Elevation Data Well Name Sample Date Depth to Water (ft bgs) TOC (ft amsl) Cave Creek Landfill, Maricopa County Water Level Elevation (ft amsl) Pump Intake Elevation (ft amsl) Depth of Water Above Pump (ft below top of water table) MW-03 5/8/2012 703.4 1,866.6 1,163.2 1,142.6 20.6 6/13/2012 701.7 1,866.6 1,164.9 1,142.6 22.3 7/23/2012 702.2 1,866.6 1,164.4 1,142.6 21.9 8/21/2012 702.8 1,866.6 1,163.8 1,142.6 21.3 9/17/2012 703.9 1,866.6 1,162.7 1,142.6 20.1 10/18/2012 704.3 1,866.6 1,162.3 1,142.6 19.8 11/16/2010 687.4 1,850.0 1,162.6 1,132.0 30.7 12/16/2010 687.4 1,850.0 1,162.6 1,132.0 30.6 1/11/2011 687.6 1,850.0 1,162.4 1,132.0 30.4 2/15/2011 687.0 1,850.0 1,163.0 1,132.0 31.0 MW-04 3/9/2011 687.4 1,850.0 1,162.6 1,132.0 30.6 4/30/2011 687.3 1,850.0 1,162.7 1,132.0 30.8 4/30/2011 687.3 1,850.0 1,162.7 1,132.0 30.8 5/26/2011 687.3 1,850.0 1,162.7 1,132.0 30.7 5/26/2011 687.3 1,850.0 1,162.7 1,132.0 30.7 6/30/2011 687.5 1,850.0 1,162.5 1,132.0 30.6 7/12/2011 687.5 1,850.0 1,162.5 1,132.0 30.5 8/18/2011 687.6 1,850.0 1,162.4 1,132.0 30.5 9/16/2011 687.6 1,850.0 1,162.4 1,132.0 30.4 10/24/2011 687.7 1,850.0 1,162.3 1,132.0 30.3 11/22/2011 688.1 1,850.0 1,161.9 1,132.0 30.0 12/19/2011 688.0 1,850.0 1,162.0 1,132.0 30.0 1/30/2012 687.2 1,850.0 1,162.7 1,132.0 30.8 2/15/2012 687.5 1,850.0 1,162.5 1,132.0 30.5 3/14/2012 687.7 1,850.0 1,162.2 1,132.0 30.3 4/30/2012 687.4 1,850.0 1,162.6 1,132.0 30.6 5/8/2012 687.8 1,850.0 1,162.2 1,132.0 30.2 6/13/2012 687.9 1,850.0 1,162.0 1,132.0 30.1 7/23/2012 688.2 1,850.0 1,161.8 1,132.0 29.8 8/22/2012 688.3 1,850.0 1,161.6 1,132.0 29.7 9/17/2012 688.6 1,850.0 1,161.4 1,132.0 29.5 10/18/2012 688.9 1,850.0 1,161.1 1,132.0 29.1 1/11/2011 683.2 1,845.2 1,162.0 1,144.2 17.8 2/15/2011 682.6 1,845.2 1,162.6 1,144.2 18.4 3/9/2011 683.2 1,845.2 1,162.0 1,144.2 17.8 4/30/2011 683.0 1,845.2 1,162.2 1,144.2 18.0 4/30/2011 683.0 1,845.2 1,162.2 1,144.2 18.0 5/26/2011 683.1 1,845.2 1,162.2 1,144.2 18.0 5/26/2011 683.1 1,845.2 1,162.2 1,144.2 18.0 6/30/2011 679.5 1,845.2 1,165.7 1,144.2 21.5 7/12/2011 679.5 1,845.2 1,165.7 1,144.2 21.5 8/18/2011 682.2 1,845.2 1,163.0 1,144.2 18.8 MW-05 9/16/2011 683.3 1,845.2 1,161.9 1,144.2 17.7 10/24/2011 682.9 1,845.2 1,162.3 1,144.2 18.1 11/22/2011 687.3 1,845.2 1,158.0 1,144.2 13.8 12/19/2011 687.4 1,845.2 1,157.9 1,144.2 13.7 1/30/2012 683.2 1,845.2 1,162.0 1,144.2 17.8 2/15/2012 683.2 1,845.2 1,162.0 1,144.2 17.8 Monday, November 19, 2012 Page 7 of 12 Appendix D. Groundwater Elevation Data Well Name TOC (ft amsl) Cave Creek Landfill, Maricopa County Sample Date Depth to Water (ft bgs) Water Level Elevation (ft amsl) Pump Intake Elevation (ft amsl) Depth of Water Above Pump (ft below top of water table) 3/14/2012 683.4 1,845.2 1,161.8 1,144.2 17.6 4/30/2012 684.3 1,845.2 1,160.9 1,144.2 16.7 5/8/2012 683.6 1,845.2 1,161.6 1,144.2 17.4 6/13/2012 683.6 1,845.2 1,161.6 1,144.2 17.4 7/23/2012 683.9 1,845.2 1,161.3 1,144.2 17.1 8/20/2012 684.0 1,845.2 1,161.3 1,144.2 17.1 9/17/2012 684.3 1,845.2 1,160.9 1,144.2 16.7 10/18/2012 684.6 1,845.2 1,160.7 1,144.2 16.5 5/26/2011 696.0 1,860.8 1,164.8 1,141.3 23.5 5/26/2011 696.0 1,860.8 1,164.8 1,141.3 23.5 6/30/2011 699.5 1,860.8 1,161.3 1,141.3 20.0 7/12/2011 699.9 1,860.8 1,161.0 1,141.3 19.7 8/18/2011 700.0 1,860.8 1,160.8 1,141.3 19.5 MW-05 MW-06 9/16/2011 700.0 1,860.8 1,160.8 1,141.3 19.5 10/24/2011 700.2 1,860.8 1,160.6 1,141.3 19.3 11/22/2011 700.3 1,860.8 1,160.5 1,141.3 19.2 12/19/2011 700.4 1,860.8 1,160.5 1,141.3 19.2 1/30/2012 699.6 1,860.8 1,161.2 1,141.3 19.9 2/15/2012 700.0 1,860.8 1,160.8 1,141.3 19.5 3/14/2012 700.1 1,860.8 1,160.8 1,141.3 19.4 4/30/2012 700.2 1,860.8 1,160.6 1,141.3 19.3 5/8/2012 700.3 1,860.8 1,160.5 1,141.3 19.2 6/13/2012 700.7 1,860.8 1,160.1 1,141.3 18.8 7/23/2012 700.7 1,860.8 1,160.1 1,141.3 18.8 8/20/2012 700.7 1,860.8 1,160.2 1,141.3 18.9 9/17/2012 700.1 1,860.8 1,160.7 1,141.3 19.4 10/18/2012 701.3 1,860.8 1,159.5 1,141.3 18.2 3/14/2012 697.5 1,859.7 1,162.2 1,142.2 20.0 4/30/2012 697.4 1,859.7 1,162.3 1,142.2 20.1 5/8/2012 697.4 1,859.7 1,162.3 1,142.2 20.1 6/13/2012 697.7 1,859.7 1,162.0 1,142.2 19.8 7/23/2012 698.1 1,859.7 1,161.6 1,142.2 19.4 8/21/2012 697.7 1,859.7 1,162.0 1,142.2 19.8 9/17/2012 697.7 1,859.7 1,162.0 1,142.2 19.9 10/18/2012 698.9 1,859.7 1,160.8 1,142.2 18.7 3/14/2012 719.2 1,889.2 1,170.0 1,153.7 16.3 4/30/2012 719.5 1,889.2 1,169.8 1,153.7 16.0 MW-07 MW-08 5/8/2012 719.5 1,889.2 1,169.7 1,153.7 16.0 6/13/2012 719.7 1,889.2 1,169.6 1,153.7 15.8 7/23/2012 720.1 1,889.2 1,169.1 1,153.7 15.4 8/20/2012 720.2 1,889.2 1,169.0 1,153.7 15.3 9/17/2012 720.8 1,889.2 1,168.4 1,153.7 14.7 10/18/2012 721.2 1,889.2 1,168.1 1,153.7 14.4 4/12/2001 675.5 1,881.4 1,205.9 1,131.4 74.5 5/23/2001 675.0 1,881.4 1,206.4 1,131.4 75.0 9/21/2001 675.0 1,881.4 1,206.4 1,131.4 75.0 PW Monday, November 19, 2012 Page 8 of 12 Appendix D. Groundwater Elevation Data Well Name TOC (ft amsl) Cave Creek Landfill, Maricopa County Sample Date Depth to Water (ft bgs) Water Level Elevation (ft amsl) Pump Intake Elevation (ft amsl) Depth of Water Above Pump (ft below top of water table) 10/2/2001 678.0 1,881.4 1,203.4 1,131.4 72.0 1/28/2002 682.0 1,881.4 1,199.4 1,131.4 68.0 3/22/2002 682.0 1,881.4 1,199.4 1,131.4 68.0 4/30/2002 682.0 1,881.4 1,199.4 1,131.4 68.0 9/23/2002 686.0 1,881.4 1,195.4 1,131.4 64.0 1/10/2003 686.0 1,881.4 1,195.4 1,131.4 64.0 2/14/2003 686.0 1,881.4 1,195.4 1,131.4 64.0 3/11/2003 686.0 1,881.4 1,195.4 1,131.4 64.0 4/18/2003 686.0 1,881.4 1,195.4 1,131.4 64.0 5/16/2003 688.0 1,881.4 1,193.4 1,131.4 62.0 7/17/2003 688.0 1,881.4 1,193.4 1,131.4 62.0 PW 9/6/2003 688.0 1,881.4 1,193.4 1,131.4 62.0 1/12/2004 688.0 1,881.4 1,193.4 1,131.4 62.0 2/9/2004 688.0 1,881.4 1,193.4 1,131.4 62.0 3/17/2004 688.0 1,881.4 1,193.4 1,131.4 62.0 4/23/2004 688.0 1,881.4 1,193.4 1,131.4 62.0 3/2/2005 695.1 1,881.4 1,186.3 1,131.4 54.9 3/9/2005 693.2 1,881.4 1,188.2 1,131.4 56.8 3/21/2005 692.3 1,881.4 1,189.1 1,131.4 57.7 4/8/2005 691.0 1,881.4 1,190.4 1,131.4 59.0 6/1/2005 692.0 1,881.4 1,189.4 1,131.4 58.0 6/14/2005 696.2 1,881.4 1,185.2 1,131.4 53.8 6/30/2005 697.2 1,881.4 1,184.2 1,131.4 52.8 7/7/2005 697.4 1,881.4 1,184.0 1,131.4 52.6 7/14/2005 698.5 1,881.4 1,182.9 1,131.4 51.5 7/21/2005 695.1 1,881.4 1,186.3 1,131.4 54.9 7/28/2005 695.7 1,881.4 1,185.8 1,131.4 54.3 8/5/2005 691.0 1,881.4 1,190.4 1,131.4 59.0 8/12/2005 694.3 1,881.4 1,187.2 1,131.4 55.8 8/19/2005 693.5 1,881.4 1,187.9 1,131.4 56.5 8/26/2005 690.8 1,881.4 1,190.6 1,131.4 59.2 9/2/2005 689.9 1,881.4 1,191.5 1,131.4 60.1 9/8/2005 687.5 1,881.4 1,194.0 1,131.4 62.6 9/15/2005 687.5 1,881.4 1,193.9 1,131.4 62.5 9/22/2005 686.4 1,881.4 1,195.1 1,131.4 63.6 9/29/2005 685.8 1,881.4 1,195.6 1,131.4 64.2 10/6/2005 685.9 1,881.4 1,195.6 1,131.4 64.1 10/13/2005 685.7 1,881.4 1,195.7 1,131.4 64.3 10/20/2005 698.2 1,881.4 1,183.3 1,131.4 51.9 10/20/2005 698.2 1,881.4 1,183.3 1,131.4 51.9 10/27/2005 698.2 1,881.4 1,183.3 1,131.4 51.9 10/27/2005 698.2 1,881.4 1,183.3 1,131.4 51.9 11/3/2005 698.1 1,881.4 1,183.3 1,131.4 51.9 11/3/2005 698.1 1,881.4 1,183.3 1,131.4 51.9 11/10/2005 698.3 1,881.4 1,183.2 1,131.4 51.8 11/10/2005 698.3 1,881.4 1,183.2 1,131.4 51.8 12/8/2005 698.0 1,881.4 1,183.5 1,131.4 52.1 12/8/2005 698.0 1,881.4 1,183.5 1,131.4 52.1 1/12/2006 698.0 1,881.4 1,183.4 1,131.4 52.0 1/12/2006 698.0 1,881.4 1,183.4 1,131.4 52.0 Monday, November 19, 2012 Page 9 of 12 Appendix D. Groundwater Elevation Data Well Name TOC (ft amsl) Cave Creek Landfill, Maricopa County Sample Date Depth to Water (ft bgs) Water Level Elevation (ft amsl) Pump Intake Elevation (ft amsl) Depth of Water Above Pump (ft below top of water table) 2/10/2006 698.9 1,881.4 1,182.5 1,131.4 51.1 2/10/2006 698.9 1,881.4 1,182.5 1,131.4 51.1 3/10/2006 698.8 1,881.4 1,182.6 1,131.4 51.2 3/10/2006 698.8 1,881.4 1,182.6 1,131.4 51.2 4/13/2006 699.1 1,881.4 1,182.4 1,131.4 51.0 4/13/2006 699.1 1,881.4 1,182.4 1,131.4 51.0 5/9/2006 699.3 1,881.4 1,182.1 1,131.4 50.7 PW 5/9/2006 699.3 1,881.4 1,182.1 1,131.4 50.7 6/20/2006 699.2 1,881.4 1,182.3 1,131.4 50.8 6/20/2006 699.2 1,881.4 1,182.3 1,131.4 50.8 7/13/2006 699.2 1,881.4 1,182.2 1,131.4 50.8 7/13/2006 699.2 1,881.4 1,182.2 1,131.4 50.8 8/16/2006 700.1 1,881.4 1,181.3 1,131.4 49.9 8/16/2006 700.1 1,881.4 1,181.3 1,131.4 49.9 9/19/2006 699.1 1,881.4 1,182.3 1,131.4 50.9 9/19/2006 699.1 1,881.4 1,182.3 1,131.4 50.9 10/13/2006 700.0 1,881.4 1,181.4 1,131.4 50.0 10/13/2006 700.0 1,881.4 1,181.4 1,131.4 50.0 11/13/2006 701.8 1,881.4 1,179.6 1,131.4 48.2 11/13/2006 701.8 1,881.4 1,179.6 1,131.4 48.2 12/13/2006 700.8 1,881.4 1,180.7 1,131.4 49.3 12/13/2006 700.8 1,881.4 1,180.7 1,131.4 49.3 1/18/2007 701.2 1,881.4 1,180.2 1,131.4 48.8 1/18/2007 701.2 1,881.4 1,180.2 1,131.4 48.8 2/21/2007 701.7 1,881.4 1,179.8 1,131.4 48.3 2/21/2007 701.7 1,881.4 1,179.8 1,131.4 48.3 3/20/2007 701.9 1,881.4 1,179.5 1,131.4 48.1 3/20/2007 701.9 1,881.4 1,179.5 1,131.4 48.1 4/16/2007 702.1 1,881.4 1,179.3 1,131.4 47.9 4/16/2007 702.1 1,881.4 1,179.3 1,131.4 47.9 5/22/2007 702.4 1,881.4 1,179.1 1,131.4 47.6 5/22/2007 702.4 1,881.4 1,179.1 1,131.4 47.6 6/12/2007 702.8 1,881.4 1,178.7 1,131.4 47.2 6/12/2007 702.8 1,881.4 1,178.7 1,131.4 47.2 7/18/2007 702.9 1,881.4 1,178.6 1,131.4 47.1 7/18/2007 702.9 1,881.4 1,178.6 1,131.4 47.1 9/18/2007 703.8 1,881.4 1,177.7 1,131.4 46.3 9/18/2007 703.8 1,881.4 1,177.7 1,131.4 46.3 10/24/2007 704.0 1,881.4 1,177.5 1,131.4 46.1 10/24/2007 704.0 1,881.4 1,177.5 1,131.4 46.1 11/16/2007 704.3 1,881.4 1,177.2 1,131.4 45.8 11/16/2007 704.3 1,881.4 1,177.2 1,131.4 45.8 12/19/2007 704.7 1,881.4 1,176.8 1,131.4 45.4 12/19/2007 704.7 1,881.4 1,176.8 1,131.4 45.4 1/12/2008 705.5 1,881.4 1,175.9 1,131.4 44.5 1/12/2008 705.5 1,881.4 1,175.9 1,131.4 44.5 2/20/2008 705.1 1,881.4 1,176.3 1,131.4 44.9 2/20/2008 705.1 1,881.4 1,176.3 1,131.4 44.9 3/12/2008 706.0 1,881.4 1,175.4 1,131.4 44.0 3/12/2008 706.0 1,881.4 1,175.4 1,131.4 44.0 Monday, November 19, 2012 Page 10 of 12 Appendix D. Groundwater Elevation Data Well Name TOC (ft amsl) Cave Creek Landfill, Maricopa County Sample Date Depth to Water (ft bgs) Water Level Elevation (ft amsl) Pump Intake Elevation (ft amsl) Depth of Water Above Pump (ft below top of water table) 4/16/2008 706.5 1,881.4 1,174.9 1,131.4 43.5 4/16/2008 706.5 1,881.4 1,174.9 1,131.4 43.5 5/20/2008 704.3 1,881.4 1,177.1 1,131.4 45.7 5/20/2008 704.3 1,881.4 1,177.1 1,131.4 45.7 6/16/2008 705.5 1,881.4 1,175.9 1,131.4 44.5 6/16/2008 705.5 1,881.4 1,175.9 1,131.4 44.5 7/18/2008 705.7 1,881.4 1,175.7 1,131.4 44.3 7/18/2008 705.7 1,881.4 1,175.7 1,131.4 44.3 8/13/2008 707.1 1,881.4 1,174.3 1,131.4 42.9 8/13/2008 707.1 1,881.4 1,174.3 1,131.4 42.9 9/15/2008 706.8 1,881.4 1,174.6 1,131.4 43.2 PW 9/15/2008 706.8 1,881.4 1,174.6 1,131.4 43.2 10/16/2008 707.6 1,881.4 1,173.8 1,131.4 42.4 10/16/2008 707.6 1,881.4 1,173.8 1,131.4 42.4 11/14/2008 707.6 1,881.4 1,173.8 1,131.4 42.4 11/14/2008 707.6 1,881.4 1,173.8 1,131.4 42.4 12/12/2008 706.8 1,881.4 1,174.6 1,131.4 43.2 12/12/2008 706.8 1,881.4 1,174.6 1,131.4 43.2 1/13/2009 707.0 1,881.4 1,174.4 1,131.4 43.0 1/13/2009 707.0 1,881.4 1,174.4 1,131.4 43.0 2/12/2009 708.2 1,881.4 1,173.2 1,131.4 41.8 2/12/2009 708.2 1,881.4 1,173.2 1,131.4 41.8 3/12/2009 707.8 1,881.4 1,173.6 1,131.4 42.2 3/12/2009 707.8 1,881.4 1,173.6 1,131.4 42.2 7/15/2009 708.4 1,881.4 1,173.1 1,152.4 20.7 7/15/2009 708.4 1,881.4 1,173.1 1,152.4 20.7 8/14/2009 708.8 1,881.4 1,172.6 1,152.4 20.2 9/17/2009 708.7 1,881.4 1,172.8 1,152.4 20.4 10/15/2009 708.8 1,881.4 1,172.6 1,152.4 20.2 11/12/2009 708.8 1,881.4 1,172.6 1,152.4 20.2 12/11/2009 708.7 1,881.4 1,172.7 1,152.4 20.3 1/13/2010 709.3 1,881.4 1,172.2 1,152.4 19.8 2/17/2010 707.9 1,881.4 1,173.5 1,152.4 21.1 3/10/2010 709.7 1,881.4 1,171.7 1,152.4 19.3 4/16/2010 710.0 1,881.4 1,171.5 1,152.4 19.1 5/20/2010 709.8 1,881.4 1,171.6 1,152.4 19.2 6/16/2010 709.8 1,881.4 1,171.6 1,152.4 19.2 7/20/2010 709.7 1,881.4 1,171.7 1,152.4 19.3 8/13/2010 709.7 1,881.4 1,171.7 1,152.4 19.3 9/13/2010 709.8 1,881.4 1,171.6 1,152.4 19.2 10/15/2010 709.6 1,881.4 1,171.9 1,152.4 19.4 11/16/2010 709.6 1,881.4 1,171.8 1,152.4 19.4 12/16/2010 709.7 1,881.4 1,171.8 1,152.4 19.4 1/11/2011 709.7 1,881.4 1,171.8 1,152.4 19.3 2/15/2011 709.6 1,881.4 1,171.8 1,152.4 19.4 3/9/2011 709.7 1,881.4 1,171.7 1,152.4 19.3 4/30/2011 709.7 1,881.4 1,171.8 1,152.4 19.4 4/30/2011 709.7 1,881.4 1,171.8 1,152.4 19.4 5/26/2011 709.7 1,881.4 1,171.7 1,152.4 19.3 5/26/2011 709.7 1,881.4 1,171.7 1,152.4 19.3 Monday, November 19, 2012 Page 11 of 12 Appendix D. Groundwater Elevation Data Well Name TOC (ft amsl) Cave Creek Landfill, Maricopa County Sample Date Depth to Water (ft bgs) Water Level Elevation (ft amsl) Pump Intake Elevation (ft amsl) Depth of Water Above Pump (ft below top of water table) 6/30/2011 710.1 1,881.4 1,171.3 1,152.4 18.9 7/12/2011 710.1 1,881.4 1,171.3 1,152.4 18.9 8/18/2011 710.2 1,881.4 1,171.2 1,152.4 18.8 PW 9/16/2011 710.3 1,881.4 1,171.1 1,152.4 18.7 10/24/2011 710.5 1,881.4 1,171.0 1,152.4 18.5 11/22/2011 710.1 1,881.4 1,171.3 1,152.4 18.9 12/19/2011 710.2 1,881.4 1,171.3 1,152.4 18.9 1/30/2012 710.4 1,881.4 1,171.0 1,152.4 18.6 2/15/2012 711.6 1,881.4 1,169.8 1,152.4 17.4 3/14/2012 710.7 1,881.4 1,170.8 1,152.4 18.3 4/30/2012 710.4 1,881.4 1,171.1 1,152.4 18.6 5/8/2012 711.0 1,881.4 1,170.4 1,152.4 18.0 6/13/2012 711.1 1,881.4 1,170.3 1,152.4 17.9 7/23/2012 711.5 1,881.4 1,169.9 1,152.4 17.5 8/22/2012 711.8 1,881.4 1,169.6 1,152.4 17.2 9/17/2012 712.1 1,881.4 1,169.3 1,152.4 16.9 10/18/2012 712.5 1,881.4 1,169.0 1,152.4 16.6 Notes: TOC - Top of Casing ft bgs - Feet below ground surface ft amsl - Feet above mean sea level Monday, November 19, 2012 Page 12 of 12 APPENDIX E GROUNDWATER ANALYTICAL RESULTS SUMMARY OF ORGANIC DATA Appendix E. Groundwater Analytical Results - Summary of Organic Data Sample Date Sample Elevation (ft amsl) Units 1,1-Dichloroethane 1,1-Dichloroethene Benzene Bromoform Carbon disulfide Chlorobenzene Chloroform cis-1,2-Dichloroethene Tetrachloroethene Toluene trans-1,2-dichloroethene Trichloroethene Vinyl Chloride Well Name Cave Creek Landfill, Maricopa County Comments 6/14/1993 1,200.6 µg/L <2 <2 <2 <5 - <2 <2 <2 <2 <2 <2 <2 <5 -- 6/22/1993 1,200.6 µg/L <0.5 <0.5 <1 <1 - <1 <0.5 - - <1 <1 <0.5 <2 -- 12/17/1997 1,200.6 µg/L - - - - - - - - - - - 15 - -- 5/28/1998 1,200.6 µg/L - - - - - - - - - - - 11 - -- 3/26/1999 1,200.6 µg/L - - - - - - - - - - - <0.5 - -- 8/12/1999 1,200.6 µg/L - - - - - - - - - - - 2 - -- 8/30/1999 1,200.6 µg/L - - - - - - - - - - - <0.5 - -- 3/9/2005 1,155.6 µg/L - - - - - - - - - - - 5.2 - -- 4/8/2005 1,155.6 µg/L - - - - - - - - - - - 7.1 - -- 5/11/2005 1,155.6 µg/L - - - - - - - - - - - 7.4 - -- 7/13/2005 1,155.6 µg/L - - - - - - - - - - - 9.9 - -- 8/12/2005 1,155.6 µg/L - - - - - - - - - - - 10.6 - -- 1/12/2006 1,155.6 µg/L <1 1.6 <0.5 <1 <0.5 <0.5 <0.5 <0.5 <0.5 <3 <0.5 17 <0.5 -- 2/10/2006 1,155.6 µg/L <1 1.8 <0.5 <1 <0.5 <0.5 <0.5 <0.5 <0.5 <3 <0.5 17 <0.5 -- 4/7/2006 1,155.6 µg/L <1 2 <0.5 <1 <0.5 <0.5 <0.5 <0.5 <0.5 <3 <0.5 20 <0.5 -- 5/9/2006 1,155.6 µg/L <1 1.7 <0.5 <1 <0.5 <0.5 <0.5 <0.5 0.6 <3 <0.5 24 <0.5 -- 6/20/2006 1,155.6 µg/L <1 2 <0.5 <1 <0.5 <0.5 <0.5 <0.5 0.7 <3 <0.5 29 <0.5 -- 8/16/2006 1,155.6 µg/L <1 <0.5 <0.5 <1 <0.5 <0.5 <0.5 <0.5 <0.5 <3 <0.5 1.3 <0.5 -- 9/19/2006 1,155.6 µg/L <1 0.9 <0.5 <1 <0.5 <0.5 <0.5 <0.5 <0.5 <3 <0.5 11 <0.5 -- 11/17/2006 1,155.6 µg/L <1 2.5 <0.5 <1 <0.5 <0.5 <0.5 <0.5 1 <3 <0.5 40 <0.5 -- 12/13/2006 1,155.6 µg/L <1 1.6 <0.5 <1 <0.5 <0.5 <0.5 0.5 0.6 <3 <0.5 22 <0.5 -- 2/21/2007 1,155.6 µg/L <1 2.8 <0.5 <1 <0.5 <0.5 <0.5 <0.5 1.3 <3 <0.5 63 <0.5 -- 3/20/2007 1,155.6 µg/L <1 2.7 <0.5 <1 <0.5 <0.5 <0.5 <0.5 1.4 <3 <0.5 66 <0.5 -- 4/16/2007 1,155.6 µg/L <1 2.9 <0.5 <1 <0.5 <0.5 <0.5 <0.5 1.6 <3 <0.5 75 <0.5 -- 5/22/2007 1,155.6 µg/L <1 2.4 <0.5 <1 <0.5 <0.5 <0.5 0.7 1.4 <3 <0.5 57 <0.5 -- 6/12/2007 1,155.6 µg/L <1 2.1 <0.5 <1 <0.5 <0.5 <0.5 0.5 1.3 <3 <0.5 57 <0.5 -- 6/14/1993 1,181.0 µg/L <2 <2 <2 <5 - <2 <2 <2 <2 <2 <2 <2 <5 -- 6/22/1993 1,181.0 µg/L <0.5 <0.5 <1 <1 - <1 <0.5 - - <1 <1 <0.5 <2 -- 12/17/1997 1,181.0 µg/L - - - - - - - - - - - 2.5 - -- 5/28/1998 1,181.0 µg/L - - - - - - - - - - - 2.5 - -- 11/17/1998 1,181.0 µg/L - - - - - - - - - - - 7 - -- 3/26/1999 1,181.0 µg/L - - - - - - - - - - - 6.3 - -- 8/12/1999 1,181.0 µg/L - - - - - - - - - - - 34 - -- 8/30/1999 1,181.0 µg/L - - - - - - - - - - - 6.3 - -- N/A 7 5 80 N/A 100 80 70 5 1,000 100 5 2 MW-01 MW-02 AWQS: Monday, November 19, 2012 Page 1 of 10 Appendix E. Groundwater Analytical Results - Summary of Organic Data Sample Date Sample Elevation (ft amsl) Units 1,1-Dichloroethane 1,1-Dichloroethene Benzene Bromoform Carbon disulfide Chlorobenzene Chloroform cis-1,2-Dichloroethene Tetrachloroethene Toluene trans-1,2-dichloroethene Trichloroethene Vinyl Chloride Well Name Cave Creek Landfill, Maricopa County Comments 1/19/2000 1,181.0 µg/L - - - - - - - - - - - 28 - -- 2/25/2000 1,181.0 µg/L - - - - - - - - - - - <0.7 - -- 8/18/2000 1,181.0 µg/L - - - - - - - - - - - 11 - -- 9/22/2000 1,181.0 µg/L - - - - - - - - - - - 12 - -- 11/22/2000 1,181.0 µg/L - - - - - - - - - - - 12 - -- 12/6/2000 1,181.0 µg/L - - - - - - - - - - - <0.5 - -- 1/19/2001 1,181.0 µg/L - - - - - - - - - - - <0.5 - -- 1/22/2001 1,181.0 µg/L - - - - - - - - - - - <0.5 - -- 3/7/2001 1,181.0 µg/L - - - - - - - - - - - 2.3 - -- 3/27/2001 1,181.0 µg/L - - - - - - - - - - - 2.3 - -- 4/12/2001 1,181.0 µg/L - - - - - - - - - - - 2.5 - -- 5/23/2001 1,181.0 µg/L - - - - - - - - - - - <0.6 - -- 6/1/2001 1,181.0 µg/L - - - - - - - - - - - <0.6 - -- 7/20/2001 1,181.0 µg/L - - - - - - - - - - - 1.7 - -- 10/2/2001 1,181.0 µg/L - - - - - - - - - - - <0.6 - -- 11/27/2001 1,181.0 µg/L - - - - - - - - - - - <0.6 - -- 3/22/2002 1,181.0 µg/L - - - - - - - - - - - <0.2 - -- 4/1/2002 1,181.0 µg/L - - - - - - - - - - - <0.2 - -- 3/1/2003 1,181.0 µg/L - - - - - - - - - - - <0.2 - -- 5/27/2004 1,181.0 µg/L - - - - - - - - - - - <0.1 - -- 6/30/2004 1,181.0 µg/L - - - - - - - - - - - <0.1 - -- 7/27/2004 1,181.0 µg/L - - - - - - - - - - - <0.1 - -- 8/24/2004 1,181.0 µg/L - - - - - - - - - - - <2 - -- 9/28/2004 1,181.0 µg/L - - - - - - - - - - - <2 - -- 11/4/2004 1,181.0 µg/L - - - - - - - - - - - <2 - -- 3/9/2005 1,152.0 µg/L - - - - - - - - - - - <2 - -- 4/8/2005 1,152.0 µg/L - - - - - - - - - - - <2 - -- 5/11/2005 1,152.0 µg/L - - - - - - - - - - - <2 - -- 7/13/2005 1,152.0 µg/L - - - - - - - - - - - <2 - -- 8/12/2005 1,152.0 µg/L - - - - - - - - - - - <2 - -- 1/12/2006 1,152.0 µg/L <1 <0.5 <0.5 <1 <0.5 <0.5 <0.5 <0.5 <0.5 <3 <0.5 <0.5 <0.5 -- 2/10/2006 1,152.0 µg/L <1 <0.5 <0.5 <1 <0.5 <0.5 <0.5 <0.5 <0.5 <3 <0.5 <0.5 <0.5 -- 4/7/2006 1,152.0 µg/L <1 <0.5 <0.5 <1 <0.5 <0.5 <0.5 <0.5 <0.5 <3 <0.5 0.5 <0.5 -- 5/9/2006 1,152.0 µg/L <1 <0.5 <0.5 <1 <0.5 <0.5 <0.5 <0.5 <0.5 <3 <0.5 0.7 <0.5 -- 6/20/2006 1,152.0 µg/L <1 <0.5 <0.5 <1 <0.5 <0.5 <0.5 <0.5 <0.5 <3 <0.5 1 <0.5 -- N/A 7 5 80 100 80 70 5 1,000 100 5 2 MW-02 AWQS: Monday, November 19, 2012 N/A Page 2 of 10 Appendix E. Groundwater Analytical Results - Summary of Organic Data Sample Date Sample Elevation (ft amsl) Units 1,1-Dichloroethane 1,1-Dichloroethene Benzene Bromoform Carbon disulfide Chlorobenzene Chloroform cis-1,2-Dichloroethene Tetrachloroethene Toluene trans-1,2-dichloroethene Trichloroethene Vinyl Chloride Well Name Cave Creek Landfill, Maricopa County Comments 8/16/2006 1,152.0 µg/L <1 2 <0.5 <1 <0.5 <0.5 <0.5 <0.5 0.7 <3 <0.5 29 <0.5 -- 9/19/2006 1,152.0 µg/L <1 <0.5 <0.5 <1 <0.5 <0.5 <0.5 <0.5 <0.5 <3 <0.5 1.4 <0.5 -- 11/17/2006 1,152.0 µg/L <1 <0.5 <0.5 <1 <0.5 <0.5 <0.5 <0.5 <0.5 <3 <0.5 2.6 <0.5 -- 12/13/2006 1,152.0 µg/L <1 <0.5 <0.5 <1 <0.5 <0.5 <0.5 <0.5 <0.5 <3 <0.5 2.9 <0.5 -- 2/21/2007 1,152.0 µg/L <1 <0.5 <0.5 <1 <0.5 <0.5 <0.5 <0.5 <0.5 <3 <0.5 5.9 <0.5 -- 3/20/2007 1,152.0 µg/L <1 <0.5 <0.5 <1 <0.5 <0.5 <0.5 <0.5 <0.5 <3 <0.5 7.2 <0.5 -- 4/16/2007 1,152.0 µg/L <1 <0.5 <0.5 <1 <0.5 <0.5 <0.5 <0.5 <0.5 <3 <0.5 9.9 <0.5 -- 5/22/2007 1,152.0 µg/L <1 <0.5 <0.5 <1 <0.5 <0.5 <0.5 <0.5 <0.5 <3 <0.5 12 <0.5 -- 6/12/2007 1,152.0 µg/L <1 <0.5 <0.5 <1 <0.5 <0.5 <0.5 <0.5 <0.5 <3 <0.5 15 <0.5 -- 7/18/2007 1,152.0 µg/L <1 <0.5 <0.5 <1 <0.5 <0.5 <0.5 <0.5 <0.5 <3 <0.5 18 <0.5 -- 9/18/2007 1,152.0 µg/L <1 <0.5 <0.5 <1 <0.5 <0.5 <0.5 <0.5 <0.5 <3 <0.5 32 <0.5 -- 10/24/2007 1,152.0 µg/L <1 <0.5 <0.5 <1 <0.5 <0.5 <0.5 <0.5 <0.5 <3 <0.5 39 <0.5 -- 11/16/2007 1,152.0 µg/L <1 <0.5 <0.5 <1 <0.5 <0.5 <0.5 <0.5 <0.5 <3 <0.5 44 <0.5 -- 1/22/2008 1,152.0 µg/L <1 <0.5 <0.5 <1 <0.5 <0.5 <0.5 0.5 <0.5 <3 <0.5 65 <0.5 -- 3/12/2008 1,152.0 µg/L <1 <0.5 <0.5 <1 <0.5 <0.5 <0.5 <1 <0.5 <3 <0.5 130 <1 -- 4/17/2008 1,152.0 µg/L <1 0.5 <0.5 <1 <0.5 <0.5 <0.5 0.7 0.7 <3 <0.5 120 <0.5 -- 5/20/2008 1,152.0 µg/L <1 0.9 <0.5 <1 <0.5 <0.5 <0.5 1.6 0.8 <3 <0.5 120 <0.5 -- 6/16/2008 1,152.0 µg/L <1 0.9 <0.5 <1 <0.5 <0.5 <0.5 1.6 1.1 <3 <0.5 150 <0.5 -- 8/13/2008 1,152.0 µg/L <1 1.3 <0.5 <1 <0.5 <0.5 <0.5 1.8 1.4 <2 <0.5 190 <0.5 -- 9/15/2008 1,152.0 µg/L <1 1.1 <0.5 <1 <0.5 <0.5 <0.5 1.4 1 <2 <0.5 140 <0.5 -- 10/16/2008 1,152.0 µg/L <1 1.3 <0.5 <1 <0.5 <0.5 <0.5 1.8 1.4 <2 <0.5 190 <0.5 -- 11/14/2008 1,152.0 µg/L <1 1.3 <0.5 <1 <0.5 <0.5 <0.5 3.1 1.3 <2 <0.5 150 <0.5 -- 12/12/2008 1,152.0 µg/L <1 1.6 <0.5 <1 <0.5 <0.5 <0.5 2 2 <2 <0.5 240 <0.5 -- 1/13/2009 1,152.0 µg/L <1 1.7 <0.5 <1 <0.5 <0.5 <0.5 2.5 2 <2 <0.5 320 <0.5 -- 2/12/2009 1,152.0 µg/L <1 1.5 <0.5 <1 <0.5 <0.5 <0.5 1.8 2.1 <2 <0.5 270 <0.5 -- 3/12/2009 1,152.0 µg/L <1 1.6 <0.5 <1 <0.5 <0.5 <0.5 2.9 2.7 <2 <0.5 280 <0.5 -- 4/10/2009 1,152.0 µg/L <1 2.2 <0.5 <1 <0.5 <0.5 <0.5 3.5 2.5 <2 <0.5 330 <0.5 -- 5/12/2009 1,152.0 µg/L <1 2.3 <0.5 <1 <0.5 <0.5 <0.5 5.9 3 <2 <0.5 290 <0.5 -- 6/9/2009 1,161.0 µg/L <1 2.5 <0.5 <1 <0.5 <0.5 <0.5 13 2.3 <2 <0.5 190 <0.5 PDB sample was collected at 695 feet bgs. 6/9/2009 1,161.0 µg/L <1 2.4 <0.5 <1 <0.5 <0.5 <0.5 13 2.6 <2 <0.5 150 <0.5 PDB sample was collected at 695 feet bgs. 6/9/2009 1,141.0 µg/L <1 2.5 <0.5 <1 <0.5 <0.5 <0.5 14 2.5 <2 <0.5 170 <0.5 PDB sample was collected at 715 feet bgs. 6/9/2009 1,121.0 µg/L <1 2.2 <0.5 <1 <0.5 <0.5 <0.5 14 2.2 <2 <0.5 99 <0.5 PDB sample was collected at 735 feet bgs. 7/16/2009 1,142.0 µg/L <1 3.3 <0.5 <1 <0.5 <0.5 <0.5 6.9 4.2 <2 <0.5 380 <0.5 -- 8/14/2009 1,142.0 µg/L <1 2.6 <0.5 <1 <0.5 <0.5 <0.5 4.5 4.1 <2 <0.5 390 <0.5 -- 9/17/2009 1,142.0 µg/L <1 3.6 <0.5 <1 <0.5 <0.5 <0.5 6.4 4.2 <2 <0.5 400 <0.5 -- N/A 7 5 80 100 80 70 5 1,000 100 5 2 MW-02 AWQS: Monday, November 19, 2012 N/A Page 3 of 10 Appendix E. Groundwater Analytical Results - Summary of Organic Data Sample Date Sample Elevation (ft amsl) Units 1,1-Dichloroethane 1,1-Dichloroethene Benzene Bromoform Carbon disulfide Chlorobenzene Chloroform cis-1,2-Dichloroethene Tetrachloroethene Toluene trans-1,2-dichloroethene Trichloroethene Vinyl Chloride Well Name Cave Creek Landfill, Maricopa County Comments 10/15/2009 1,142.0 µg/L <1 3.4 <0.5 <1 <0.5 <0.5 <0.5 5.2 4.9 <2 <0.5 430 <0.5 -- 11/12/2009 1,142.0 µg/L <1 3.1 <0.5 <1 <0.5 <0.5 <0.5 3.8 4.4 <2 <0.5 340 <0.5 -- 12/11/2009 1,142.0 µg/L <1 3.9 <0.5 <1 <0.5 <0.5 0.5 3.4 5.5 <2 <0.5 410 <0.5 -- 1/13/2010 1,142.0 µg/L <1 3.5 <0.5 <1 <0.5 <0.5 <0.5 5.8 4.8 <2 <0.5 400 <0.5 -- 2/17/2010 1,142.0 µg/L <1 1.4 <0.5 <1 <0.5 <0.5 <0.5 3.4 4.8 <2 <0.5 410 <0.5 -- 3/10/2010 1,142.0 µg/L <0.5 3.5 <0.5 <1 <0.5 <0.5 <0.5 5.5 4.9 <2 <0.5 340 <0.5 -- 4/16/2010 1,142.0 µg/L 0.5 4.4 <0.5 <1 <0.5 <0.5 <0.5 5.6 6.1 <2 <0.5 450 <0.5 -- 6/16/2010 1,142.0 µg/L 0.6 5.4 <0.5 <1 <0.5 <0.5 <0.5 8.3 6.1 <2 <0.5 420 <0.5 -- 9/10/2010 1,142.0 µg/L <0.5 4.8 <0.5 <1 <0.5 <0.5 <0.5 2.9 6.2 <2 <0.5 428 <0.5 -- 11/19/2010 1,142.0 µg/L <0.5 4.4 <0.5 <1 <0.5 <0.5 <0.5 3.1 7.5 <2 <0.5 412 <0.5 -- 11/24/2010 1,142.0 µg/L 0.5 6 <0.5 <1 <0.5 <0.5 <0.5 6.1 6.3 <2 <0.5 264 <0.5 -- 3/8/2011 1,142.0 µg/L <0.5 5.6 <0.5 <1 <0.5 <0.5 <0.5 2.8 4.8 <2 <0.5 215 <0.5 -- 3/30/2011 1,142.0 µg/L <0.5 6.8 <0.5 <1 <0.5 <0.5 <0.5 2.6 5.5 <2 <0.5 303 <0.5 -- 5/26/2011 1,142.0 µg/L <0.5 7.1 <0.5 <1 <0.5 <0.5 <0.5 2.2 5.5 <2 <0.5 315 <0.5 -- 8/23/2011 1,142.0 µg/L <0.5 9.1 <0.5 <1 <0.5 <0.5 <0.5 2.1 5 <2 <0.5 228 <0.5 -- 11/22/2011 1,142.0 µg/L <0.5 10.9 <0.5 <1 <0.5 <0.5 <0.5 <0.5 4.3 <2 <0.5 198 <0.5 -- 2/21/2012 1,142.0 µg/L <0.5 8.5 <0.5 <1 <0.5 <0.5 <0.5 1.5 3.1 <2 <0.5 127 <0.5 -- 5/10/2012 1,142.0 µg/L <5 8.2 <200 <10 <50 <5 <40 <50 6.1 <20 <5 135 <10 -- 8/22/2012 1,142.0 µg/L <5 5.8 <5 <5 <50 <5 <5 <5 <5 <5 <5 105 <2 -- 1/22/2008 1,089.6 µg/L <1 <0.5 <0.5 <1 <0.5 <0.5 <0.5 <0.5 <0.5 <3 <0.5 <0.5 <0.5 -- 3/12/2008 1,089.6 µg/L <1 <0.5 <0.5 <1 <0.5 <0.5 <0.5 <1 <0.5 <3 <0.5 <0.5 <1 -- 4/17/2008 1,089.6 µg/L <1 <0.5 <0.5 <1 <0.5 <0.5 <0.5 <0.5 <0.5 <3 <0.5 <0.5 <0.5 -- 5/20/2008 1,089.6 µg/L <1 <0.5 <0.5 <1 <0.5 <0.5 <0.5 <0.5 <0.5 <3 <0.5 <0.5 <0.5 -- 6/16/2008 1,089.6 µg/L <1 <0.5 <0.5 <1 0.6 <0.5 <0.5 <0.5 <0.5 <3 <0.5 <0.5 <0.5 -- 8/13/2008 1,089.6 µg/L <1 <0.5 <0.5 <1 <0.5 <0.5 <0.5 <0.5 <0.5 <2 <0.5 <0.5 <0.5 -- 9/15/2008 1,089.6 µg/L <1 <0.5 <0.5 <1 <0.5 <0.5 <0.5 <0.5 <0.5 <2 <0.5 <0.5 <0.5 -- 10/16/2008 1,089.6 µg/L <1 <0.5 <0.5 <1 <0.5 <0.5 <0.5 <0.5 <0.5 <2 <0.5 <0.5 <0.5 -- 11/14/2008 1,089.6 µg/L <1 <0.5 <0.5 <1 <0.5 <0.5 <0.5 <0.5 <0.5 <2 <0.5 <0.5 <0.5 -- 12/12/2008 1,089.6 µg/L <1 <0.5 <0.5 <1 <0.5 <0.5 <0.5 <0.5 <0.5 <2 <0.5 <0.5 <0.5 -- 1/13/2009 1,089.6 µg/L <1 <0.5 <0.5 <1 <0.5 <0.5 <0.5 <0.5 <0.5 <2 <0.5 <0.5 <0.5 -- 2/12/2009 1,089.6 µg/L <1 <0.5 <0.5 <1 <0.5 <0.5 <0.5 <0.5 <0.5 <2 <0.5 <0.5 <0.5 -- 3/12/2009 1,089.6 µg/L <1 <0.5 <0.5 <1 <0.5 <0.5 <0.5 <0.5 <0.5 <2 <0.5 <0.5 <0.5 -- 4/10/2009 1,089.6 µg/L <1 <0.5 <0.5 <1 <0.5 <0.5 <0.5 <0.5 <0.5 <2 <0.5 <0.5 <0.5 -- 5/12/2009 1,089.6 µg/L <1 <0.5 <0.5 <1 <0.5 <0.5 <0.5 <0.5 <0.5 <2 <0.5 <0.5 <0.5 -- N/A 7 5 80 100 80 70 5 1,000 100 5 2 MW-02 MW-03 AWQS: Monday, November 19, 2012 N/A Page 4 of 10 Appendix E. Groundwater Analytical Results - Summary of Organic Data Sample Date Sample Elevation (ft amsl) Units 1,1-Dichloroethane 1,1-Dichloroethene Benzene Bromoform Carbon disulfide Chlorobenzene Chloroform cis-1,2-Dichloroethene Tetrachloroethene Toluene trans-1,2-dichloroethene Trichloroethene Vinyl Chloride Well Name Cave Creek Landfill, Maricopa County Comments 7/16/2009 1,142.6 µg/L <1 <0.5 <0.5 <1 <0.5 <0.5 <0.5 <0.5 <0.5 <2 <0.5 <0.5 <0.5 -- 8/14/2009 1,142.6 µg/L <1 <0.5 <0.5 <1 <0.5 <0.5 <0.5 <0.5 <0.5 <2 <0.5 <0.5 <0.5 -- 9/17/2009 1,142.6 µg/L <1 <0.5 <0.5 <1 0.5 <0.5 <0.5 <0.5 <0.5 <2 <0.5 0.9 <0.5 -- 10/15/2009 1,142.6 µg/L <1 <0.5 <0.5 <1 <0.5 <0.5 <0.5 <0.5 <0.5 <2 <0.5 <0.5 <0.5 -- 11/12/2009 1,142.6 µg/L <1 <0.5 <0.5 <1 <0.5 <0.5 <0.5 <0.5 <0.5 <2 <0.5 <0.5 <0.5 -- 12/11/2009 1,142.6 µg/L <1 <0.5 <0.5 <1 <0.5 <0.5 <0.5 <0.5 <0.5 <2 <0.5 0.8 <0.5 -- 1/13/2010 1,142.6 µg/L <1 <0.5 <0.5 <1 <0.5 <0.5 <0.5 <0.5 <0.5 <2 <0.5 <0.5 <0.5 -- 2/17/2010 1,142.6 µg/L <1 <0.5 <0.5 <1 <0.5 <0.5 <0.5 <0.5 <0.5 <2 <0.5 <0.5 <0.5 -- 3/10/2010 1,142.6 µg/L <0.5 <0.5 <0.5 <1 <0.5 <0.5 <0.5 <0.5 <0.5 <2 <0.5 0.5 <0.5 -- 4/16/2010 1,142.6 µg/L <0.5 <0.5 <0.5 <1 <0.5 <0.5 <0.5 <0.5 <0.5 <2 <0.5 <0.5 <0.5 -- 6/16/2010 1,142.6 µg/L <0.5 <0.5 <0.5 <1 <0.5 <0.5 <0.5 <0.5 <0.5 <2 <0.5 1.4 <0.5 -- 9/10/2010 1,142.6 µg/L <0.5 <0.5 <0.5 <1 <0.5 <0.5 <0.5 <0.5 <0.5 <2 <0.5 0.7 <0.5 -- 11/19/2010 1,142.6 µg/L <0.5 <0.5 <0.5 <1 <0.5 <0.5 <0.5 <0.5 <0.5 <2 <0.5 0.7 <0.5 -- 11/24/2010 1,142.6 µg/L <0.5 <0.5 <0.5 <1 <0.5 <0.5 <0.5 <0.5 <0.5 <2 <0.5 1.6 <0.5 -- 3/8/2011 1,142.6 µg/L <0.5 <0.5 <0.5 <1 <0.5 <0.5 <0.5 <0.5 <0.5 <2 <0.5 0.9 <0.5 -- 5/26/2011 1,142.6 µg/L <0.5 <0.5 <0.5 <1 <0.5 <0.5 <0.5 <0.5 <0.5 <2 <0.5 1 <0.5 -- 8/19/2011 1,142.6 µg/L <0.5 <0.5 <0.5 <1 <0.5 <0.5 <0.5 <0.5 <0.5 <2 <0.5 2.4 <0.5 -- 11/22/2011 1,142.6 µg/L <0.5 <0.5 <0.5 <1 <0.5 <0.5 <0.5 <0.5 <0.5 <2 <0.5 2.6 <0.5 -- 2/16/2012 1,142.6 µg/L <0.5 <0.5 <0.5 <1 <0.5 <0.5 <0.5 <0.5 <0.5 <2 <0.5 1.5 <0.5 -- 5/10/2012 1,142.6 µg/L <0.5 <0.5 <20 <1 <5 <0.5 <4 <5 <0.5 <2 <0.5 1.9 <1 -- 8/21/2012 1,142.6 µg/L <5 <5 <5 <5 <50 <5 <5 <5 <5 <5 <5 <5 <2 -- 11/19/2010 1,132.0 µg/L <0.5 <0.5 <0.5 <1 <0.5 <0.5 <0.5 <0.5 <0.5 12.4 <0.5 5.2 <0.5 -- 11/24/2010 1,132.0 µg/L <0.5 <0.5 <0.5 <1 <0.5 <0.5 <0.5 <0.5 <0.5 5.2 <0.5 5.3 <0.5 -- 3/8/2011 1,132.0 µg/L <0.5 <0.5 <0.5 <1 <0.5 <0.5 <0.5 <0.5 <0.5 <2 <0.5 5.9 <0.5 -- 5/26/2011 1,132.0 µg/L <0.5 <0.5 <0.5 <1 <0.5 <0.5 <0.5 <0.5 <0.5 <2 <0.5 4.7 <0.5 -- 8/19/2011 1,132.0 µg/L <0.5 <0.5 <0.5 <1 <0.5 <0.5 <0.5 <0.5 <0.5 <2 <0.5 12.5 <0.5 -- 11/22/2011 1,132.0 µg/L <0.5 <0.5 <0.5 <1 <0.5 <0.5 <0.5 <0.5 <0.5 <2 <0.5 19.9 <0.5 -- 2/16/2012 1,132.0 µg/L <0.5 <0.5 <0.5 <1 <0.5 <0.5 <0.5 <0.5 <0.5 <2 <0.5 12.9 <0.5 -- 5/8/2012 1,132.0 µg/L <0.5 <0.5 <0.5 <1 <0.5 <0.5 <0.5 <0.5 <0.5 <2 <0.5 18.1 <0.5 -- 8/22/2012 1,132.0 µg/L <5 <5 <5 <5 <50 <5 <5 <5 <5 <5 <5 32.6 <2 -- 3/8/2011 1,144.2 µg/L <0.5 <0.5 <0.5 <1 <0.5 <0.5 <0.5 <0.5 <0.5 31.2 <0.5 <0.5 <0.5 -- 5/26/2011 1,144.2 µg/L <0.5 <0.5 <0.5 <1 <0.5 <0.5 <0.5 <0.5 <0.5 8.5 <0.5 <0.5 <0.5 -- 8/18/2011 1,144.2 µg/L <0.5 <0.5 <0.5 <1 <0.5 <0.5 <0.5 <0.5 <0.5 10.7 <0.5 <0.5 <0.5 -- N/A 7 5 80 100 80 70 5 1,000 100 5 2 MW-03 MW-04 MW-05 AWQS: Monday, November 19, 2012 N/A Page 5 of 10 Appendix E. Groundwater Analytical Results - Summary of Organic Data Sample Date Sample Elevation (ft amsl) Units 1,1-Dichloroethane 1,1-Dichloroethene Benzene Bromoform Carbon disulfide Chlorobenzene Chloroform cis-1,2-Dichloroethene Tetrachloroethene Toluene trans-1,2-dichloroethene Trichloroethene Vinyl Chloride Well Name Cave Creek Landfill, Maricopa County Comments 11/21/2011 1,144.2 µg/L <0.5 <0.5 <0.5 <1 <0.5 <0.5 <0.5 <0.5 <0.5 7.6 <0.5 <0.5 <0.5 -- 2/15/2012 1,144.2 µg/L <0.5 <0.5 <0.5 <1 <0.5 <0.5 <0.5 <0.5 <0.5 4.2 <0.5 <0.5 <0.5 -- 5/9/2012 1,144.2 µg/L <0.5 <0.5 <0.5 <1 <0.5 <0.5 <0.5 <0.5 <0.5 4.5 <0.5 <0.5 <0.5 -- 8/20/2012 1,144.2 µg/L <5 <5 <5 <5 <50 <5 <5 <5 <5 <5 <5 <5 <2 -- 5/26/2011 1,141.3 µg/L <0.5 <0.5 <0.5 <1 <0.5 <0.5 <0.5 <0.5 <0.5 2 <0.5 0.9 <0.5 -- 8/19/2011 1,141.3 µg/L <0.5 <0.5 <0.5 <1 <0.5 <0.5 <0.5 <0.5 <0.5 <2 <0.5 1.3 <0.5 -- 11/21/2011 1,141.3 µg/L <0.5 <0.5 <0.5 <1 <0.5 <0.5 <0.5 <0.5 <0.5 <2 <0.5 1.8 <0.5 -- 2/15/2012 1,141.3 µg/L <0.5 <0.5 <0.5 <1 <0.5 <0.5 <0.5 <0.5 <0.5 <2 <0.5 2 <0.5 -- 5/9/2012 1,141.3 µg/L <0.5 <0.5 <0.5 <1 <0.5 <0.5 <0.5 <0.5 <0.5 <2 <0.5 2 <0.5 -- 8/20/2012 1,141.3 µg/L <5 <5 <5 <5 <50 <5 <5 <5 <5 <5 <5 <5 <2 -- 2/17/2012 1,142.2 µg/L <0.5 <0.5 <0.5 <1 <0.5 <0.5 <0.5 <0.5 <0.5 0.7 <0.5 <0.5 <0.5 -- 4/19/2012 1,142.2 µg/L <0.5 <0.5 <0.5 <1 <0.5 <0.5 <0.5 <0.5 <0.5 <2 <0.5 <0.5 <0.5 -- 5/8/2012 1,142.2 µg/L <0.5 <0.5 <0.5 <1 <0.5 <0.5 <0.5 <0.5 <0.5 <2 <0.5 <0.5 <0.5 -- 8/21/2012 1,142.2 µg/L <5 <5 <5 <5 <50 <5 <5 <5 <5 <5 <5 <5 <2 -- 2/28/2012 1,153.7 µg/L <0.5 <0.5 <0.5 <1 <0.5 <0.5 <0.5 <0.5 <0.5 33 <0.5 <0.5 <0.5 -- 4/19/2012 1,153.7 µg/L <0.5 <0.5 <0.5 <1 <0.5 <0.5 <0.5 <0.5 <0.5 4.9 <0.5 <0.5 <0.5 -- 5/8/2012 1,153.7 µg/L <0.5 <0.5 <0.5 <1 <0.5 <0.5 <0.5 <0.5 <0.5 <2 <0.5 <0.5 <0.5 -- 8/20/2012 1,153.7 µg/L <5 <5 <5 <5 <50 <5 <5 <5 <5 <5 <5 <5 <2 -- 9/19/1985 1,131.4 µg/L <4.7 <2.8 <4.4 <4.7 - <6 <1.6 - <4.1 8.2 <1.6 9.8 <10 -- 9/27/1985 1,131.4 µg/L - - - - - - - - - - - 9.8 - -- 10/7/1985 1,131.4 µg/L - - - - - - - - - - - 9.8 - -- 11/18/1985 1,131.4 µg/L <4.7 <2.8 <4.4 <4.7 - <6 <1.6 - <4.1 <6 <1.6 <1.9 <10 -- 11/27/1985 1,131.4 µg/L - - - - - - - - - - - <1.9 - -- 12/6/1985 1,131.4 µg/L <1 <1 <1 <1 - <1 <1 - 3.3 <1 <1 <1 <1 -- 7/16/1986 1,131.4 µg/L - - - - - - - - <1 <1 - <1 - -- 8/4/1986 1,131.4 µg/L - - 2.3 - - - - - - - - <1 - -- 6/8/1987 1,131.4 µg/L - - - - - - - - <1 <1 - <1 - -- 6/10/1987 1,131.4 µg/L - - - - - - - - <1 <1 - <1 - -- 10/23/1987 1,131.4 µg/L <0.5 <0.5 <0.5 <0.5 - <0.5 <0.5 - 4.3 <0.5 <0.5 <0.5 <0.5 -- 5/25/1988 1,131.4 µg/L <1 <1 <1 <1 - <1 <1 - <1 <1 <1 <1 <1 -- 3/19/1990 1,131.4 µg/L <0.5 <0.5 <0.5 <0.5 - <0.5 <0.5 - <0.5 <0.5 <0.5 <0.5 <0.5 -- N/A 7 5 80 100 80 70 5 1,000 100 5 2 MW-05 MW-06 MW-07 MW-08 PW AWQS: Monday, November 19, 2012 N/A Page 6 of 10 Appendix E. Groundwater Analytical Results - Summary of Organic Data Sample Date Sample Elevation (ft amsl) Units 1,1-Dichloroethane 1,1-Dichloroethene Benzene Bromoform Carbon disulfide Chlorobenzene Chloroform cis-1,2-Dichloroethene Tetrachloroethene Toluene trans-1,2-dichloroethene Trichloroethene Vinyl Chloride Well Name Cave Creek Landfill, Maricopa County Comments 3/21/1990 1,131.4 µg/L - - - - - - - - - - - <1 - -- 8/14/1991 1,131.4 µg/L <1 <1 <1 <1 - <1 <1 - <1 <1 <1 <1 <1 -- 11/20/1991 1,131.4 µg/L <1 <1 <1 <1 - <1 <1 - <1 <1 <1 <1 <1 -- 7/22/1992 1,131.4 µg/L <0.5 <0.5 <1 <1 - <1 <0.5 - - <1 <1 <1 <2 -- 7/31/1992 1,131.4 µg/L - - - - - - - - - - - <1 - -- 12/17/1997 1,131.4 µg/L - - - - - - - - - - - <1 - -- 5/28/1998 1,131.4 µg/L - - - - - - - - - - - 8.9 - -- 7/28/1998 1,131.4 µg/L - - - - - - - - - - - 8.5 - -- 11/17/1998 1,131.4 µg/L - - - - - - - - - - - 12 - -- 3/26/1999 1,131.4 µg/L - - - - - - - - - - - 17 - -- 8/12/1999 1,131.4 µg/L - - - - - - - - - - - 22 - -- 8/30/1999 1,131.4 µg/L - - - - - - - - - - - 17 - -- 1/19/2000 1,131.4 µg/L - - - - - - - - - - - 4.6 - -- 2/25/2000 1,131.4 µg/L - - - - - - - - - - - 4.3 - -- 6/19/2000 1,131.4 µg/L - - - - - - - - - - - 9.1 - -- 8/18/2000 1,131.4 µg/L - - - - - - - - - - - 9.6 - -- 9/22/2000 1,131.4 µg/L - - - - - - - - - - - 10 - -- 11/22/2000 1,131.4 µg/L - - - - - - - - - - - 10 - -- 12/6/2000 1,131.4 µg/L - - - - - - - - - - - 13 - -- 1/19/2001 1,131.4 µg/L - - - - - - - - - - - 31 - -- 1/22/2001 1,131.4 µg/L - - - - - - - - - - - 31 - -- 3/7/2001 1,131.4 µg/L - - - - - - - - - - - 16 - -- 3/27/2001 1,131.4 µg/L - - - - - - - - - - - 16 - -- 4/12/2001 1,131.4 µg/L - - - - - - - - - - - 22 - -- 5/23/2001 1,131.4 µg/L - - - - - - - - - - - 6.7 - -- 6/1/2001 1,131.4 µg/L - - - - - - - - - - - 13 - -- 7/20/2001 1,131.4 µg/L - - - - - - - - - - - 7.9 - -- 10/2/2001 1,131.4 µg/L - - - - - - - - - - - 4.4 - -- 11/27/2001 1,131.4 µg/L - - - - - - - - - - - 3.8 - -- 1/28/2002 1,131.4 µg/L - - - - - - - - - - - 4.8 - -- 2/1/2002 1,131.4 µg/L - - - - - - - - - - - 4.8 - -- 3/1/2002 1,131.4 µg/L - - - - - - - - - - - 7 - -- 3/22/2002 1,131.4 µg/L - - - - - - - - - - - 7 - -- 4/1/2002 1,131.4 µg/L - - - - - - - - - - - 4.9 - -- 4/30/2002 1,131.4 µg/L - - - - - - - - - - - 4.9 - -- N/A 7 5 80 N/A 100 80 70 5 1,000 100 5 2 PW AWQS: Monday, November 19, 2012 Page 7 of 10 Appendix E. Groundwater Analytical Results - Summary of Organic Data Sample Date Sample Elevation (ft amsl) Units 1,1-Dichloroethane 1,1-Dichloroethene Benzene Bromoform Carbon disulfide Chlorobenzene Chloroform cis-1,2-Dichloroethene Tetrachloroethene Toluene trans-1,2-dichloroethene Trichloroethene Vinyl Chloride Well Name Cave Creek Landfill, Maricopa County Comments 6/1/2002 1,131.4 µg/L - - - - - - - - - - - 4.4 - -- 6/3/2002 1,131.4 µg/L - - - - - - - - - - - 4.4 - -- 8/1/2002 1,131.4 µg/L - - - - - - - - - - - 8.3 - -- 8/7/2002 1,131.4 µg/L - - - - - - - - - - - 8.3 - -- 9/1/2002 1,131.4 µg/L - - - - - - - - - - - 8 - -- 10/1/2002 1,131.4 µg/L - - - - - - - - - - - 8.6 - -- 10/21/2002 1,131.4 µg/L - - - - - - - - - - - 9.1 - -- 12/1/2002 1,131.4 µg/L - - - - - - - - - - - 16 - -- 12/4/2002 1,131.4 µg/L - - - - - - - - - - - 16 - -- 1/1/2003 1,131.4 µg/L - - - - - - - - - - - 15 - -- 1/10/2003 1,131.4 µg/L - - - - - - - - - - - 15 - -- 3/1/2003 1,131.4 µg/L - - - - - - - - - - - 18 - -- 3/11/2003 1,131.4 µg/L - - - - - - - - - - - 18 - -- 4/1/2003 1,131.4 µg/L - - - - - - - - - - - 17 - -- 4/18/2003 1,131.4 µg/L - - - - - - - - - - - 17 - -- 5/1/2003 1,131.4 µg/L - - - - - - - - - - - 21 - -- 5/16/2003 1,131.4 µg/L - - - - - - - - - - - 21 - -- 6/1/2003 1,131.4 µg/L - - - - - - - - - - - 18 - -- 6/13/2003 1,131.4 µg/L - - - - - - - - - - - 18 - -- 7/1/2003 1,131.4 µg/L - - - - - - - - - - - 18 - -- 7/17/2003 1,131.4 µg/L - - - - - - - - - - - 18 - -- 9/16/2003 1,131.4 µg/L - - - - - - - - - - - 16 - -- 10/1/2003 1,131.4 µg/L - - - - - - - - - - - 20 - -- 10/24/2003 1,131.4 µg/L - - - - - - - - - - - 20 - -- 11/1/2003 1,131.4 µg/L - - - - - - - - - - - 21 - -- 12/1/2003 1,131.4 µg/L - - - - - - - - - - - 22 - -- 1/1/2004 1,131.4 µg/L - - - - - - - - - - - 22 - -- 1/12/2004 1,131.4 µg/L - - - - - - - - - - - 22 - -- 2/1/2004 1,131.4 µg/L - - - - - - - - - - - 23 - -- 2/9/2004 1,131.4 µg/L - - - - - - - - - - - 23 - -- 3/1/2004 1,131.4 µg/L - - - - - - - - - - - 25 - -- 3/17/2004 1,131.4 µg/L - - - - - - - - - - - 25 - -- 4/1/2004 1,131.4 µg/L - - - - - - - - - - - 27 - -- 4/23/2004 1,131.4 µg/L - - - - - - - - - - - 27 - -- 5/1/2004 1,131.4 µg/L - - - - - - - - - - - 25 - -- N/A 7 5 80 N/A 100 80 70 5 1,000 100 5 2 PW AWQS: Monday, November 19, 2012 Page 8 of 10 Appendix E. Groundwater Analytical Results - Summary of Organic Data Sample Date Sample Elevation (ft amsl) Units 1,1-Dichloroethane 1,1-Dichloroethene Benzene Bromoform Carbon disulfide Chlorobenzene Chloroform cis-1,2-Dichloroethene Tetrachloroethene Toluene trans-1,2-dichloroethene Trichloroethene Vinyl Chloride Well Name Cave Creek Landfill, Maricopa County Comments 6/1/2004 1,131.4 µg/L - - - - - - - - - - - 26 - -- 7/1/2004 1,131.4 µg/L - - - - - - - - - - - 26 - -- 7/27/2004 1,131.4 µg/L - - - - - - - - - - - 24 - -- 8/24/2004 1,131.4 µg/L - - - - - - - - - - - 30 - -- 9/28/2004 1,131.4 µg/L - - - - - - - - - - - 23 - -- 11/4/2004 1,131.4 µg/L - - - - - - - - - - - 24 - -- 3/9/2005 1,131.4 µg/L - - - - - - - - - - - 3.4 - -- 4/8/2005 1,131.4 µg/L - - - - - - - - - - - 1.4 - -- 5/11/2005 1,131.4 µg/L - - - - - - - - - - - 3 - -- 7/13/2005 1,131.4 µg/L - - - - - - - - - - - 2.6 - -- 8/12/2005 1,131.4 µg/L - - - - - - - - - - - 7.8 - -- 1/12/2006 1,131.4 µg/L <1 <0.5 <0.5 2.4 <0.5 <0.5 <0.5 0.5 0.8 <3 <0.5 16 <0.5 -- 2/10/2006 1,131.4 µg/L <1 1.5 <0.5 <1 <0.5 <0.5 <0.5 1.8 2.1 <3 <0.5 44 <0.5 -- 4/7/2006 1,131.4 µg/L <1 0.6 <0.5 <1 <0.5 <0.5 <0.5 0.6 0.8 <3 <0.5 15 <0.5 -- 5/9/2006 1,131.4 µg/L <1 <0.5 <0.5 <1 <0.5 <0.5 <0.5 0.5 0.6 <3 <0.5 10 <0.5 -- 6/20/2006 1,131.4 µg/L <1 <0.5 <0.5 <1 <0.5 <0.5 <0.5 0.6 0.7 <3 <0.5 11 <0.5 -- 8/16/2006 1,131.4 µg/L <1 0.5 <0.5 <1 <0.5 <0.5 <0.5 0.7 0.8 <3 <0.5 12 <0.5 -- 9/19/2006 1,131.4 µg/L <1 <0.5 <0.5 <1 <0.5 <0.5 <0.5 <0.5 <0.5 <3 <0.5 3 <0.5 -- 12/13/2006 1,131.4 µg/L <1 <0.5 <0.5 <1 <0.5 <0.5 <0.5 <0.5 <0.5 <3 <0.5 3 <0.5 -- 2/21/2007 1,131.4 µg/L <1 0.6 <0.5 <1 <0.5 <0.5 <0.5 0.8 0.7 <3 <0.5 12 <0.5 -- 3/20/2007 1,131.4 µg/L <1 0.5 <0.5 <1 <0.5 <0.5 <0.5 0.9 0.7 <3 <0.5 10 <0.5 -- 4/16/2007 1,131.4 µg/L <1 0.6 <0.5 <1 <0.5 <0.5 <0.5 1 1 <3 <0.5 13 <0.5 -- 5/22/2007 1,131.4 µg/L <1 <0.5 <0.5 <1 <0.5 <0.5 <0.5 1.3 0.8 <3 <0.5 11 <0.5 -- 6/12/2007 1,131.4 µg/L <1 <0.5 <0.5 <1 <0.5 <0.5 <0.5 0.8 0.7 <3 <0.5 9.4 <0.5 -- 7/18/2007 1,131.4 µg/L <1 <0.5 <0.5 <1 <0.5 <0.5 <0.5 0.8 0.6 <3 <0.5 8.8 <0.5 -- 9/18/2007 1,131.4 µg/L <1 <0.5 <0.5 <1 <0.5 <0.5 <0.5 <0.5 <0.5 <3 <0.5 1.9 <0.5 -- 10/24/2007 1,131.4 µg/L <1 <0.5 <0.5 <1 <0.5 <0.5 <0.5 0.7 0.5 <3 <0.5 8.6 <0.5 -- 11/16/2007 1,131.4 µg/L <1 0.9 <0.5 <1 <0.5 <0.5 <0.5 1.1 1 <3 <0.5 13 <0.5 -- 1/22/2008 1,131.4 µg/L <1 <0.5 <0.5 <1 <0.5 <0.5 <0.5 <0.5 <0.5 <3 <0.5 2.5 <0.5 -- 3/12/2008 1,131.4 µg/L <1 <0.5 <0.5 <1 <0.5 <0.5 <0.5 <1 <0.5 <3 <0.5 1.5 <1 -- 4/17/2008 1,131.4 µg/L <1 1.2 <0.5 <1 <0.5 <0.5 <0.5 1.3 1.3 <3 <0.5 22 <0.5 -- 5/20/2008 1,131.4 µg/L <1 0.5 <0.5 <1 <0.5 <0.5 <0.5 0.6 <0.5 <3 <0.5 10 <0.5 -- 6/16/2008 1,131.4 µg/L <1 <0.5 <0.5 <1 <0.5 <0.5 <0.5 <0.5 <0.5 <3 <0.5 1.3 <0.5 -- 8/13/2008 1,131.4 µg/L <1 2.1 <0.5 <1 <0.5 <0.5 <0.5 1.6 2.5 <2 <0.5 53 <0.5 -- 9/15/2008 1,131.4 µg/L <1 3.1 <0.5 <1 <0.5 <0.5 <0.5 1.8 2.8 <2 <0.5 69 <0.5 -- N/A 7 5 80 100 80 70 5 1,000 100 5 2 PW AWQS: Monday, November 19, 2012 N/A Page 9 of 10 Appendix E. Groundwater Analytical Results - Summary of Organic Data Sample Date Sample Elevation (ft amsl) Units 1,1-Dichloroethane 1,1-Dichloroethene Benzene Bromoform Carbon disulfide Chlorobenzene Chloroform cis-1,2-Dichloroethene Tetrachloroethene Toluene trans-1,2-dichloroethene Trichloroethene Vinyl Chloride Well Name Cave Creek Landfill, Maricopa County Comments 10/16/2008 1,131.4 µg/L <1 2.9 <0.5 <1 <0.5 <0.5 <0.5 2.1 2.7 <2 <0.5 83 <0.5 -- 11/14/2008 1,131.4 µg/L <1 2.5 <0.5 <1 <0.5 <0.5 <0.5 2 1.9 <2 <0.5 70 <0.5 -- 12/12/2008 1,131.4 µg/L <1 2.7 <0.5 <1 <0.5 <0.5 <0.5 2.1 2.8 <2 <0.5 76 <0.5 -- 1/13/2009 1,131.4 µg/L <1 3.5 <0.5 <1 <0.5 <0.5 <0.5 2.6 4.3 <2 <0.5 110 <0.5 -- 2/12/2009 1,131.4 µg/L <1 2.7 <0.5 <1 <0.5 <0.5 <0.5 2.5 4.4 <2 <0.5 85 <0.5 -- 3/12/2009 1,131.4 µg/L <1 2.7 <0.5 <1 <0.5 <0.5 <0.5 2.3 4.8 <2 <0.5 86 <0.5 -- 4/10/2009 1,131.4 µg/L <1 3.4 <0.5 <1 <0.5 <0.5 <0.5 2.6 4.4 <2 <0.5 100 <0.5 -- 5/12/2009 1,131.4 µg/L <1 2.3 <0.5 <1 <0.5 <0.5 <0.5 2.3 3.9 <2 <0.5 76 <0.5 -- 7/16/2009 1,152.4 µg/L <1 <0.5 <0.5 <1 <0.5 <0.5 <0.5 <0.5 <0.5 <2 <0.5 2.1 <0.5 -- 8/14/2009 1,152.4 µg/L <1 <0.5 <0.5 <1 <0.5 <0.5 <0.5 <0.5 0.7 <2 <0.5 6.3 <0.5 -- 9/17/2009 1,152.4 µg/L <1 <0.5 <0.5 <1 <0.5 <0.5 <0.5 <0.5 <0.5 <2 <0.5 3.8 <0.5 -- 10/15/2009 1,152.4 µg/L <1 <0.5 <0.5 <1 <0.5 <0.5 <0.5 <0.5 <0.5 <2 <0.5 3.1 <0.5 -- 11/12/2009 1,152.4 µg/L <1 <0.5 <0.5 <1 <0.5 <0.5 <0.5 <0.5 <0.5 <2 <0.5 3.9 <0.5 -- 12/11/2009 1,152.4 µg/L <1 <0.5 <0.5 <1 <0.5 <0.5 <0.5 1.3 <0.5 <2 <0.5 8 <0.5 -- 1/13/2010 1,152.4 µg/L <1 <0.5 <0.5 <1 <0.5 <0.5 <0.5 1.5 <0.5 <2 <0.5 9.3 <0.5 -- 2/17/2010 1,152.4 µg/L <1 <0.5 <0.5 <1 <0.5 <0.5 <0.5 2.1 <0.5 <2 <0.5 9.5 <0.5 -- 3/10/2010 1,152.4 µg/L <0.5 <0.5 <0.5 <1 <0.5 <0.5 <0.5 2.6 <0.5 <2 <0.5 12 <0.5 -- 4/16/2010 1,152.4 µg/L <0.5 0.6 <0.5 <1 <0.5 <0.5 <0.5 2.7 1.9 <2 <0.5 42 <0.5 -- 6/16/2010 1,152.4 µg/L <0.5 <0.5 <0.5 <1 <0.5 <0.5 <0.5 0.9 <0.5 <2 <0.5 5.2 <0.5 -- 9/10/2010 1,152.4 µg/L <0.5 0.8 <0.5 <1 <0.5 <0.5 <0.5 2.3 2.2 <2 <0.5 38.3 <0.5 -- 11/19/2010 1,152.4 µg/L <0.5 <0.5 <0.5 <1 <0.5 <0.5 <0.5 1.6 1.3 <2 <0.5 21.2 <0.5 -- 11/24/2010 1,152.4 µg/L <0.5 <0.5 <0.5 <1 <0.5 <0.5 <0.5 2.1 1.4 <2 <0.5 24.2 <0.5 -- 3/8/2011 1,152.4 µg/L <0.5 1.2 <0.5 <1 <0.5 <0.5 <0.5 2.9 1.9 <2 <0.5 30.5 <0.5 -- 5/26/2011 1,152.4 µg/L <0.5 1.3 <0.5 <1 <0.5 <0.5 <0.5 4 2.3 <2 <0.5 39.6 <0.5 -- 8/19/2011 1,152.4 µg/L <0.5 2.7 <0.5 <1 <0.5 <0.5 <0.5 6.3 3.6 <2 <0.5 58.5 <0.5 -- 11/22/2011 1,152.4 µg/L 3.8 15.8 0.5 <1 <0.5 0.5 4.1 164 23.7 <2 0.6 464 10.3 -- 12/12/2011 1,152.4 µg/L <0.5 2.7 <0.5 <1 <0.5 <0.5 <0.5 19.5 2.8 <2 <0.5 54.5 <0.5 -- 2/21/2012 1,152.4 µg/L <0.5 1.6 <0.5 <1 <0.5 <0.5 <0.5 5.5 1.7 <2 <0.5 31.3 <0.5 -- 5/10/2012 1,152.4 µg/L <0.5 1.6 <20 <1 <5 <0.5 <4 5.3 1.9 <2 <0.5 27.3 <1 -- 8/22/2012 1,152.4 µg/L <5 <5 <5 <5 <50 <5 <5 <5 <5 <5 <5 21.8 <2 -- N/A 7 5 80 100 80 70 5 1,000 5 2 PW AWQS: N/A 100 Notes: AWQS - Aquifer Water Quality Standard Grey text indicates result was less than the reporting limit Bold text indicates a result detected above the AWQS µg/L - microgams per liter ft amsl - feet above mean sea level - = data not applicable or available Monday, November 19, 2012 Page 10 of 10 APPENDIX F GROUNDWATER ANALYTICAL RESULTS SUMMARY OF INORGANIC DATA Appendix F. Groundwater Analytical Results - Summary of Inorganic Data Sample Date Sample Elevation (ft amsl) Units Alkalinity, Total (CaCO3) Calcium Chloride Fluoride Iron Magnesium Nitrate (As N) Nitrate-Nitrite Nitrite Potassium Sodium Sulfate Total Dissolved Solids Well Name Cave Creek Landfill, Maricopa County 6/14/1993 1,200.6 mg/L - - 13 0.5 - - - - - - - 20 - 6/22/1993 1,200.6 mg/L - - - - <0.1 - - - - - - - - 1/12/2006 1,155.6 mg/L - 45 - - 1.1 27 - - - 3.2 46 - - 1/18/2006 1,155.6 mg/L 250 - - <0.5 - - 3.2 - - - - 18 320 7/13/2006 1,155.6 mg/L 240 43 - <0.5 1.2 26 - 3.7 <0 2.6 43 19 310 6/14/1993 1,181.0 mg/L - - 20 0.4 - - - - - - - 20 - 6/22/1993 1,181.0 mg/L - - - - 1.2 - - - - - - - - 1/12/2006 1,152.0 mg/L - 43 - - 6.6 28 - - - 3.2 39 - - 1/18/2006 1,152.0 mg/L 250 - - <0.5 - - <0.5 - - - - 15 290 7/13/2006 1,152.0 mg/L 240 42 - <0.5 1.7 29 - 2.1 <0 2.7 38 18 320 7/18/2007 1,152.0 mg/L 220 43 - <0.5 1.4 30 - 3.3 <0 2.7 38 20 320 1/22/2008 1,152.0 mg/L 240 41 - <0.5 9.8 28 - 2.9 <0 3.6 40 14 310 7/18/2008 1,152.0 mg/L 250 44 - <0.5 18 31 - 2.9 <0 3.8 41 13 240 1/13/2009 1,152.0 mg/L 230 40 15 <0.5 1.1 29 - 4.4 <0 2.9 38 16 320 7/16/2009 1,142.0 mg/L 210 33 15 <0.5 2.3 28 - 2.7 <0 2.3 36 11 260 1/13/2010 1,142.0 mg/L 220 27 15 0.4 1.2 27 - 3.3 <0 2.3 36 12 290 6/16/2010 1,142.0 mg/L 210 29 - - 0.2 28 - 3.7 <0 3.7 42 - 290 3/8/2011 1,142.0 mg/L 234 32.2 17 <0.5 0.7 29.7 - - <0 2.5 38.7 15 311 2/21/2012 1,142.0 mg/L 238 36.5 17.3 <0.5 0.4 28.6 9.5 - <0 2.6 36.9 16.2 336 5/10/2012 1,142.0 mg/L 239 38.7 16.6 <0.5 <0.2 33.3 10 - - 2.3 38.5 16.2 335 1/22/2008 1,089.6 mg/L 260 21 - <0.5 2 15 - 0.8 <0 3.4 75 8.3 340 1/13/2009 1,089.6 mg/L 260 28 18 0.5 1.6 20 - 0.7 <0 4.7 74 6.6 320 7/16/2009 1,142.6 mg/L 250 25 17 0.5 2.5 18 - 0.2 <0 4.2 64 4.6 280 1/13/2010 1,142.6 mg/L 230 23 17 0.5 0.3 22 - 0.3 <0 3.7 50 6.5 280 6/16/2010 1,142.6 mg/L 250 26 - - 0.9 28 - <0.1 <0 2.7 38 - 300 3/8/2011 1,142.6 mg/L 242 35.5 18.8 <0.5 <0.1 29.7 - 1.9 <0 2.9 37.8 14.5 299 2/16/2012 1,142.6 mg/L 249 34 18.7 0.5 <0.2 26.6 1.2 - <0 2.7 34.8 14.9 306 5/10/2012 1,142.6 mg/L 248 35.6 17.2 <0.5 <0.2 31.4 1.2 - - 2.5 35.9 14.9 360 3/8/2011 1,132.0 mg/L 250 31.9 18.4 <0.5 0.3 25 - - <0 2.8 54.5 16.2 305 2/16/2012 1,132.0 mg/L 251 35.5 18.8 0.5 1.5 26.1 1.3 - <0 2.5 32.4 14.2 282 5/8/2012 1,132.0 mg/L 249 35.6 17.1 <0.5 0.9 26.8 1.4 - - 2.6 32 14.1 299 N/A N/A N/A 4,000 1,000 1,000 N/A N/A N/A Comments MW-01 MW-02 MW-03 MW-04 AWQS: Tuesday, August 28, 2012 N/A 10,000 10,000 N/A Page 1 of 3 Appendix F. Groundwater Analytical Results - Summary of Inorganic Data Sample Date Sample Elevation (ft amsl) Units Alkalinity, Total (CaCO3) Calcium Chloride Fluoride Iron Magnesium Nitrate (As N) Nitrate-Nitrite Nitrite Potassium Sodium Sulfate Total Dissolved Solids Well Name Cave Creek Landfill, Maricopa County 3/8/2011 1,144.2 mg/L 246 31.9 18.5 <0.5 0.8 24.2 - 2.4 <0 3.7 51.7 21.8 318 2/15/2012 1,144.2 mg/L 247 36.1 16.5 0.5 0.6 26.2 1.9 - <0 4 39.3 18.3 290 5/9/2012 1,144.2 mg/L 247 35.4 15.2 <0.5 0.5 25.5 1.6 - - 3.4 37.7 17.6 331 2/15/2012 1,141.3 mg/L 254 34.9 17.6 <0.5 1.1 27.4 1.7 - <0 3.3 38.5 14.9 260 5/9/2012 1,141.3 mg/L 251 34.6 15.9 <0.5 1.3 27 1.5 - - 2.5 35.4 14.2 335 5/8/2012 1,142.2 mg/L 256 32.9 17.4 <0.5 0.4 25.6 1.3 - - 2.5 41.2 15.1 307 5/8/2012 1,153.7 mg/L 238 44.8 22.5 <0.5 0.3 18.2 0.9 - - 2 41.6 22.9 331 10/23/1987 1,131.4 mg/L - - - - 0.3 - - - - - - - - 5/25/1988 1,131.4 mg/L - 49 16 0.4 <0.1 22 - - - - 33 22 - 3/19/1990 1,131.4 mg/L - - 16 0.4 <0.1 - - - - - - 25 - 2/25/1991 1,131.4 mg/L - - - - - - - - - - - - - 8/14/1991 1,131.4 mg/L - - 16 0.5 <0.1 - - - - - - 27 - 11/20/1991 1,131.4 mg/L - - 16 0.3 <0.5 - - - - - - 26 - 7/22/1992 1,131.4 mg/L - - 17 0.4 <0.1 - - - - - - 21 - 1/12/2006 1,131.4 mg/L - 50 - - <0.1 24 - - - 2.4 37 - - 1/18/2006 1,131.4 mg/L 250 - - <0.5 - - <0.5 - - - - 12 310 7/13/2006 1,131.4 mg/L 240 47 - <0.5 <0.1 27 - 1.7 <0 2.1 38 19 320 7/18/2007 1,131.4 mg/L 240 47 - <0.5 0.1 29 - 1.4 <0 2.3 36 18 320 1/22/2008 1,131.4 mg/L 240 36 - <0.5 2.4 29 - 1.2 <0 2.3 34 9.3 280 7/18/2008 1,131.4 mg/L 250 49 - <0.5 <0.1 27 - 1.4 <0 2.6 38 19 260 1/13/2009 1,131.4 mg/L 250 48 22 <0.5 <0.1 26 - 1.4 <0 2.3 37 19 340 7/16/2009 1,152.4 mg/L 250 41 21 <0.5 0.2 33 - 1.1 <0 2.1 33 11 320 1/13/2010 1,152.4 mg/L 240 36 20 0.5 0.3 32 - 1.1 <0 2 31 11 320 6/16/2010 1,152.4 mg/L 280 42 - - <0.1 33 - <0.1 <0 2.3 35 - 330 3/8/2011 1,152.4 mg/L 246 42.2 22.3 <0.5 <0.1 32.1 - 1.5 <0 2.2 35.4 17.3 324 2/21/2012 1,152.4 mg/L 252 36.3 20.9 <0.5 0.6 25.4 1.4 - <0 2.1 30.6 17.5 276 5/10/2012 1,152.4 mg/L 251 39.7 20 <0.5 <0.2 31.1 1.4 - - 1.8 34 17.4 301 N/A N/A N/A 4,000 1,000 1,000 N/A N/A N/A Comments MW-05 MW-06 MW-07 MW-08 PW AWQS: Tuesday, August 28, 2012 N/A 10,000 10,000 N/A Page 2 of 3 Appendix F. Groundwater Analytical Results - Summary of Inorganic Data 1,000 N/A Total Dissolved Solids 10,000 Sulfate 10,000 Sodium N/A Potassium 1,000 Nitrite 4,000 Nitrate-Nitrite N/A Nitrate (As N) N/A Magnesium N/A Iron AWQS: Fluoride Units Chloride Sample Elevation (ft amsl) Calcium Sample Date Alkalinity, Total (CaCO3) Well Name Cave Creek Landfill, Maricopa County N/A N/A N/A Comments Notes: AWQS - Aquifer Water Quality Standard Grey text indicates a non-detected compound Bold text indicates a detected compound above the AWQS mg/L - milligams per liter ft amsl - feet ablove mean sea level - = data not applicable or available Tuesday, August 28, 2012 Page 3 of 3 APPENDIX G SOIL VAPOR ANALYTICAL RESULTS SUMMARY OF CHLORINATED SOLVENT AND RELATED COMPOUND DATA Appendix G. Soil Vapor Results - Summary of Chlorinated Solvent and Related Compound Data Chloroethane Chloroform Chloromethane 1,1-Dichloroethane 1,2-Dichloroethane 1,1-Dichloroethene cis-1,2-Dichloroethene trans-1,2-Dichloroethene Hexachlorobutadiene Methylene chloride 1,1,2,2-Tetrachloroethane Tetrachloroethene 1,1,1-Trichloroethane 1,1,2-Trichloroethane Trichloroethene Vinyl Chloride trans-1,3-Dichloropropene Carbon tetrachloride 6/16/2010 - µg/m³ <1.9 <1.9 <1.9 <1.9 <1.9 <1.9 <1.9 <1.9 <1.9 <1.9 <1.9 <1.9 <1.9 <1.9 <1.9 <1.9 <1.9 <1.9 <1.9 <1.9 <1.9 <1.9 Ambient Sample; One Day Preliminary SVE Test 1/5/2012 - µg/m³ <1.6 <3.1 <1.3 <2.4 <2.1 <2 <2 <2 <2 <2 <2.3 <2.3 <7.2 <10.7 <1.7 <3.4 5.4 <2.3 <2.7 <2.7 <2.7 <1.3 -- 3/9/2012 - µg/m³ <1.6 <3.1 <1.3 <2.4 <2.1 <2 <2 <2 <2 <2 <2.3 <2.3 <7.2 <10.7 <1.7 <3.4 <3.4 <2.3 <2.7 <2.7 <2.7 <1.3 -- 12/3/2009 1,870.0 µg/m³ - <170 170 <130 <220 710 <110 520 25,000 320 <120 <120 <380 <1,100 <92 <180 470 <120 <140 <140 1,300 1,600 -- 12/3/2009 1,883.7 µg/m³ - <230 700 <180 <300 570 <150 420 8,100 150 <170 <170 <530 <1,600 470 <250 2,200 <170 <200 <200 1,900 650 -- 12/3/2009 1,844.5 µg/m³ - <75 47 <58 <98 72 <48 140 2,200 <47 <55 <54 <170 <510 78 <82 1,400 <54 <65 <65 1,500 36 -- 12/3/2009 1,857.7 µg/m³ - <140 <60 <110 <190 <93 <93 120 5,400 <91 <100 <100 <330 <980 <80 <160 710 <100 <120 <120 1,000 300 -- 12/3/2009 1,854.9 µg/m³ - <150 82 <120 <200 <96 <96 160 4,000 <94 <110 <110 <340 <1,000 97 <160 1,600 <110 <130 <130 1,200 190 -- 12/3/2009 1,851.9 µg/m³ - <140 120 <110 <190 <93 <93 120 1,600 <91 <100 <100 <330 <980 <80 <160 970 <100 <120 <120 1,000 270 -- 5/19/2009 1,226.0 µg/m³ - <8 <3.3 <6.2 <10 <5.1 <5.1 <5 5.7 <5 <5.8 <5.7 <18 <54 <4.4 <8.7 <8.6 <5.7 <6.9 <6.9 110 <3.2 -- 11/15/2004 1,757.0 µg/m³ - <500 <5,000 <500 <5,000 <500 <500 <1,000 560 <500 <500 <500 - - <5,000 <1,000 <500 <500 <500 <500 520 <5,000 -- 12/8/2004 1,757.0 µg/m³ - <500 <5,000 <500 <5,000 <500 <500 <1,000 1,400 <500 <500 <500 - - <5,000 <1,000 1,300 <500 <500 <500 1,600 5,700 -- 6/9/2005 1,757.0 µg/m³ - <500 <5,000 - <5,000 - <500 - - <500 <500 <500 - - <5,000 <1,000 - <500 <500 <500 - - -- 6/10/2005 1,757.0 µg/m³ - - - <500 - 510 - <1,000 1,600 - - - - - - <1,000 9,600 - - - 15,000 <1,000 -- 1/17/2008 1,757.0 µg/m³ - - - <500 - <500 - 1,000 1,600 - - - - - - <1,000 1,700 - - - 19,000 <1,000 -- 12/1/2009 1,757.0 µg/m³ - <500 <210 760 <650 <320 <320 3,400 1,300 <310 <360 <360 <1,100 <3,400 <270 <540 6,300 <360 <430 <430 95,000 500 -- 11/8/2011 1,757.0 µg/m³ <782.5 <1,570 <660 <1,220 <1,040 <1,010 <1,010 2,030 2,500 <990 <1,160 <1,140 <3,600 <5,340 <867.5 <1,720 8,140 <1,140 <1,370 <1,370 86,000 742.4 -- 11/15/2004 1,807.0 µg/m³ - <500 <5,000 <500 <5,000 <500 <500 <1,000 <500 <500 <500 <500 - - <5,000 <1,000 930 <500 <500 <500 870 <5,000 -- 12/8/2004 1,807.0 µg/m³ - <500 <5,000 <500 <5,000 <500 <500 <1,000 <500 <500 <500 <500 - - <5,000 <1,000 1,500 <500 <500 <500 1,500 <5,000 -- 6/9/2005 1,807.0 µg/m³ - <500 <5,000 - <5,000 - <500 - - <500 <500 <500 - - <5,000 <1,000 - <500 <500 <500 - - -- 6/10/2005 1,807.0 µg/m³ - - - <500 - <500 - <1,000 1,100 - - - - - - <1,000 8,000 - - - 8,300 <1,000 -- 1/17/2008 1,807.0 µg/m³ - - - <500 - <500 - 1,600 1,800 - - - - - - <1,000 2,000 - - - 26,000 <1,000 -- 12/1/2009 1,807.0 µg/m³ - <380 <160 440 <500 <240 <240 2,500 2,900 <240 <280 <270 <870 <2,600 <210 <420 5,300 <270 <330 <330 60,000 1,000 -- 11/8/2011 1,807.0 µg/m³ <156.5 <314.5 <132 434.3 <207 <202.5 <202.5 992.5 3,450 <198 <231 <227 <720 <1,070 <173.5 <343.5 4,480 <227 <273 <273 45,100 1,230 -- 11/15/2004 1,756.0 µg/m³ - <500 <5,000 <500 <5,000 <500 <500 <1,000 <500 <500 <500 <500 - - <5,000 <1,000 1,400 <500 <500 <500 890 <5,000 -- 12/8/2004 1,756.0 µg/m³ - <500 <5,000 <500 <5,000 1,100 <500 <1,000 <500 <500 <500 <500 - - <5,000 <1,000 3,800 <500 <500 <500 1,600 <5,000 -- 1,4-Dioxane Units cis-1,3-Dichloropropene Sample Elevation (ft amsl) 1,2-Dichloropropane Sample Date Allyl chloride Well Name Cave Creek Landfill, Maricopa County Comments Ambient GW-08 GW-13 GW-19 GW-22 GW-25 GW-29 MW-02 NDP-01-D NDP-01-S NDP-02-D Wednesday, October 03, 2012 Page 1 of 5 Appendix G. Soil Vapor Results - Summary of Chlorinated Solvent and Related Compound Data 1,1,2-Trichloroethane <500 <5,000 - <5,000 - <500 - - <500 <500 <500 - - <5,000 <1,000 - <500 <500 <500 - - -- 6/10/2005 1,756.0 µg/m³ - - - <500 - 910 - <1,000 <500 - - - - - - <1,000 6,400 - - - 3,400 <5,000 -- 1/17/2008 1,756.0 µg/m³ - - - <500 - <500 - <1,000 <500 - - - - - - <1,000 1,800 - - - 4,700 <5,000 -- 12/1/2009 1,756.0 µg/m³ - <740 <310 750 <970 <480 <480 1,500 <460 <460 <540 <530 <1,700 <5,000 <410 <810 4,300 <530 <640 <640 19,000 <300 -- 11/15/2004 1,806.0 µg/m³ - <500 <5,000 <500 <5,000 <500 <500 <1,000 <500 <500 <500 <500 - - <5,000 <1,000 <500 <500 <500 <500 <500 <5,000 -- 12/8/2004 1,806.0 µg/m³ - <500 <5,000 <500 <5,000 <500 <500 <1,000 <500 <500 <500 <500 - - <5,000 <1,000 1,400 <500 <500 <500 880 <5,000 -- 6/9/2005 1,806.0 µg/m³ - <500 <5,000 - <5,000 - <500 - - <500 <500 <500 - - <5,000 <1,000 - <500 <500 <500 4,700 - -- 6/10/2005 1,806.0 µg/m³ - - - <500 - <500 - <1,000 <500 - - - - - - <1,000 5,200 - - - 470 <5,000 -- 1/17/2008 1,806.0 µg/m³ - - - 790 - <500 - 1,200 <500 - - - - - - <1,000 3,500 - - - 11,000 <5,000 -- 12/1/2009 1,806.0 µg/m³ - <510 <200 440 <640 <320 <320 980 <310 <310 <370 <350 <1,100 <3,400 <270 <530 4,000 <350 <440 <440 14,000 <200 -- 11/18/2004 1,758.0 µg/m³ - <500 <5,000 <500 <5,000 <500 <500 <1,000 <500 <500 <500 <500 - - <5,000 <1,000 <500 <500 <500 <500 <500 <5,000 -- 12/8/2004 1,758.0 µg/m³ - <500 <5,000 <500 <5,000 <500 <500 <1,000 <500 <500 <500 <500 - - <5,000 <1,000 <500 <500 <500 <500 <500 <5,000 -- 12/1/2009 1,758.0 µg/m³ - <970 <410 <750 <1,300 800 <620 380,000 <610 <610 <710 <700 <2,200 <6,600 2,600 <1,000 14,000 <700 <840 <840 21,000 1,000 -- 11/18/2004 1,808.0 µg/m³ - <500 <5,000 <500 <5,000 <500 <500 <1,000 <500 <500 <500 <500 - - <5,000 <1,000 1,500 <500 <500 <500 <500 <5,000 -- 12/8/2004 1,808.0 µg/m³ - <500 <5,000 <500 <5,000 <500 <500 3,300 <500 <500 <500 <500 - - <5,000 <1,000 <500 <500 <500 <500 <500 <5,000 -- 12/1/2009 1,808.0 µg/m³ - <260 <110 <200 <340 <170 <170 43,000 220 <160 <190 <190 <600 <1,800 380 <280 5,300 <190 <230 <230 3,600 380 -- 11/18/2004 1,758.0 µg/m³ - <500 <5,000 <500 <5,000 <500 <500 <1,000 <500 <500 <500 <500 - - <5,000 <1,000 <500 <500 <500 <500 <500 <5,000 -- 12/8/2004 1,758.0 µg/m³ - <500 <5,000 <500 <5,000 <500 <500 <1,000 <500 <500 <500 <500 - - <5,000 <1,000 <500 <500 <500 <500 <500 <5,000 -- 12/1/2009 1,758.0 µg/m³ - <30 23 30 <39 38 <19 5,800 720 42 <22 <21 <68 <200 250 <32 3,400 <21 <26 <26 4,100 2,200 -- 11/18/2004 1,808.0 µg/m³ - <500 <5,000 <500 <5,000 <500 <500 <1,000 <500 <500 <500 <500 - - <5,000 <1,000 <500 <500 <500 <500 <500 <5,000 -- 12/8/2004 1,808.0 µg/m³ - <500 <5,000 <500 <5,000 <500 <500 <1,000 <500 <500 <500 <500 - - <5,000 <1,000 <500 <500 <500 <500 <500 <5,000 -- 12/1/2009 1,808.0 µg/m³ - <20 35 <15 <26 25 <13 2,400 320 19 <15 <14 <46 <130 98 <22 2,100 <14 <17 <17 1,900 780 -- 11/18/2004 1,758.0 µg/m³ - <500 <5,000 <500 <5,000 <500 <500 <1,000 <500 <500 <500 <500 - - <5,000 <1,000 11,000 <500 <500 <500 <500 <5,000 -- 12/8/2004 1,758.0 µg/m³ - <500 <5,000 <500 <5,000 <500 <500 <1,000 <500 <500 <500 <500 - - <5,000 <1,000 640 <500 <500 <500 <500 <5,000 -- 1/17/2008 1,758.0 µg/m³ - - - <500 - <500 - <1,000 <500 - - - - - - <1,000 <500 - - - <500 <5,000 -- 12/1/2009 1,758.0 µg/m³ - <22 <9.1 41 <28 17 <14 2,600 130 <14 <16 <16 <50 <150 64 <24 1,800 <16 <19 <19 4,900 73 -- 11/8/2011 1,758.0 µg/m³ <78.3 <157.3 <66 <122 <103.5 <101.3 <101.3 361.3 <99 <99 <115.5 <113.5 <360 <533.5 <86.8 <171.8 413.6 <113.5 <136.5 <136.5 3,280 <64 -- 11/18/2004 1,808.0 µg/m³ - <500 <5,000 <500 <5,000 <500 <500 <1,000 <500 <500 <500 <500 - - <5,000 <1,000 13,000 <500 <500 <500 <500 <5,000 -- 12/8/2004 1,808.0 µg/m³ - <500 <5,000 <500 <5,000 <500 <500 <1,000 <500 <500 <500 <500 - - <5,000 <1,000 1,900 <500 <500 <500 <500 <5,000 -- Vinyl Chloride Trichloroethene 1,1,1-Trichloroethane trans-1,3-Dichloropropene Hexachlorobutadiene - Tetrachloroethene 1,4-Dioxane 1,1,2,2-Tetrachloroethane cis-1,2-Dichloroethene µg/m³ Methylene chloride 1,1-Dichloroethene cis-1,3-Dichloropropene 1,1-Dichloroethane 1,756.0 1,2-Dichloropropane Chloromethane trans-1,2-Dichloroethene Chloroform 6/9/2005 1,2-Dichloroethane Units Chloroethane Sample Elevation (ft amsl) Carbon tetrachloride Sample Date Allyl chloride Well Name Cave Creek Landfill, Maricopa County Comments NDP-02-D NDP-02-S ODP-01-D ODP-01-S ODP-02-D ODP-02-S ODP-03-D ODP-03-S Wednesday, October 03, 2012 Page 2 of 5 Appendix G. Soil Vapor Results - Summary of Chlorinated Solvent and Related Compound Data 1,1-Dichloroethane trans-1,2-Dichloroethene 1,2-Dichloropropane cis-1,3-Dichloropropene 1,4-Dioxane Hexachlorobutadiene Methylene chloride trans-1,3-Dichloropropene 1,1,1-Trichloroethane 1,1,2-Trichloroethane - - <500 - <500 - <1,000 <500 - - - - - - <1,000 <500 - - - <500 <5,000 -- 12/1/2009 1,808.0 µg/m³ - <7.3 <4.2 <5.7 <9.6 <4.7 <4.7 <4.6 <4.6 <4.6 <5.4 <5.3 <23 <50 <4 <8 <7.9 <5.3 <6.4 <8.6 <6.3 <3 -- 11/8/2011 1,808.0 µg/m³ <7.8 <15.7 <6.6 <12.2 <10.4 <10.1 <10.1 <9.9 29.7 <9.9 <11.6 <11.4 <36 <53.4 <8.7 <17.2 183.1 <11.4 <13.7 <13.7 590.7 15.6 -- 11/18/2004 1,758.0 µg/m³ - <500 <5,000 <500 <5,000 <500 <500 <1,000 <500 <500 <500 <500 - - <5,000 <1,000 740 <500 <500 <500 <500 <5,000 -- 12/8/2004 1,758.0 µg/m³ - <500 <5,000 <500 <5,000 <500 <500 <1,000 <500 <500 <500 <500 - - <5,000 <1,000 <500 <500 <500 <500 <500 <5,000 -- 1/17/2008 1,758.0 µg/m³ - - - <500 - <500 - <1,000 <500 - - - - - - <1,000 <500 - - - <500 <5,000 -- 12/1/2009 1,758.0 µg/m³ - <110 <46 <85 <140 <70 <70 28,000 260 <69 <80 <79 <250 <740 580 <120 2,600 <79 <95 <95 16,000 410 -- 11/18/2004 1,808.0 µg/m³ - <500 <5,000 <500 <5,000 <500 <500 <1,000 <500 <500 <500 <500 - - <5,000 1,000 870 <500 <500 <500 <500 <5,000 -- 12/8/2004 1,808.0 µg/m³ - <500 <5,000 <500 <5,000 <500 <500 <1,000 <500 <500 <500 <500 - - <5,000 <1,000 <500 <500 <500 <500 <500 <5,000 -- 1/17/2008 1,808.0 µg/m³ - - - <500 - 6,200 - <1,000 <500 - - - - - - <1,000 <500 - - - 2,100 <5,000 -- 12/1/2009 1,808.0 µg/m³ - <21 50 <16 <28 34 <13 1,600 92 <13 <15 <15 <48 <140 56 <23 1,200 <15 <18 <18 2,800 77 -- 11/16/2004 - µg/m³ - <500 <5,000 <500 <5,000 <500 <500 <1,000 <500 <500 <500 <500 - - <5,000 <1,000 <500 <500 <500 <500 <500 <5,000 -- 12/2/2009 - µg/m³ - <16 <6.5 29 <20 <10 <10 470 60 <9.8 <11 <11 <36 <100 14 <17 1,500 <11 <13 <13 3,500 <6.3 -- 11/16/2004 - µg/m³ - <500 <5,000 <500 <5,000 <500 <500 <1,000 <500 <500 <500 <500 - - <5,000 <1,000 <500 <500 <500 <500 <500 <5,000 -- 12/2/2009 - µg/m³ - <7.5 <3.1 13 <9.8 <4.8 <4.8 180 28 <4.7 <5.5 <5.4 <17 <51 6 <8.2 690 <5.4 <6.5 <6.5 1,600 <3 -- 11/8/2011 - µg/m³ <3.1 <6.3 <2.6 <4.9 <4.1 <4.1 <4.1 <4 <4 <4 <4.6 <4.5 <14.4 <21.3 <3.5 <6.9 <6.8 <4.5 <5.5 <5.5 33.3 <2.6 -- 3/9/2012 - µg/m³ <1.6 <3.1 <1.3 <2.4 <2.1 <2 <2 <2 <2 <2 <2.3 <2.3 <7.2 <10.7 <1.7 <3.4 <3.4 <2.3 <2.7 <2.7 <2.7 <1.3 -- 11/18/2004 - µg/m³ - <500 <5,000 <500 <5,000 830 <500 <1,000 660 <500 <500 <500 - - <5,000 <1,000 1,600 <500 <500 <500 <500 <5,000 -- 11/16/2004 - µg/m³ - <500 <5,000 <500 <5,000 <500 <500 <1,000 <500 <500 <500 <500 - - <5,000 <1,000 <500 <500 <500 <500 <500 <5,000 -- 1/5/2012 - µg/m³ <1.6 <3.1 <1.3 <2.4 <2.1 <2 <2 <2 <2 <2 <2.3 <2.3 <7.2 <10.7 <1.7 <3.4 5.4 <2.3 <2.7 <2.7 <2.7 <1.3 -- 11/16/2004 - µg/m³ - <500 <5,000 <500 <5,000 <500 <500 <1,000 <500 <500 <500 <500 - - <5,000 <1,000 <500 <500 <500 <500 <500 <5,000 -- 1/5/2012 - µg/m³ <1.6 <3.1 <1.3 <2.4 <2.1 <2 <2 <2 <2 <2 <2.3 <2.3 <7.2 <10.7 <1.7 <3.4 12.2 <2.3 <2.7 <2.7 <2.7 <1.3 -- 11/16/2004 - µg/m³ - <500 <5,000 <500 <5,000 <500 <500 <1,000 <500 <500 <500 <500 - - <5,000 <1,000 <500 <500 <500 <500 <500 <5,000 -- 1/5/2012 - µg/m³ <1.6 <3.1 <1.3 7.3 <2.1 <2 <2 <2 <2 <2 <2.3 <2.3 <7.2 <10.7 <1.7 <3.4 30.5 <2.3 <2.7 <2.7 <2.7 <1.3 -- 3/9/2012 - µg/m³ <313 <629 <264 <488 <414 <405 <405 1,349.8 <396 <396 <462 <454 <1,440 <2,130 <347 <687 1,830 <454 <546 <546 59,100 <256 -- Vinyl Chloride Chloromethane - Trichloroethene Chloroform µg/m³ Tetrachloroethene Chloroethane 1,808.0 1,1,2,2-Tetrachloroethane Carbon tetrachloride 1/17/2008 cis-1,2-Dichloroethene Units 1,1-Dichloroethene Sample Elevation (ft amsl) 1,2-Dichloroethane Sample Date Allyl chloride Well Name Cave Creek Landfill, Maricopa County Comments ODP-03-S ODP-04-D ODP-04-S P-02-D P-02-S P-03 P-05 P-06 P-07 P-08 P-09 Wednesday, October 03, 2012 Page 3 of 5 Appendix G. Soil Vapor Results - Summary of Chlorinated Solvent and Related Compound Data 1,1,2-Trichloroethane Trichloroethene <500 <5,000 <500 <500 <1,000 <500 <500 <500 <500 - - <5,000 <1,000 <500 <500 <500 <500 1,700 <5,000 -- 1/5/2012 - µg/m³ <1.6 <3.1 <1.3 <2.4 <2.1 <2 <2 14.3 <2 <2 <2.3 <2.3 <7.2 <10.7 <1.7 <3.4 34.6 <2.3 <2.7 <2.7 590.7 <1.3 -- 11/16/2004 - µg/m³ - <500 <5,000 <500 <5,000 <500 <500 <1,000 <500 <500 <500 <500 - - <5,000 <1,000 <500 <500 <500 <500 1,200 <5,000 -- 11/16/2004 - µg/m³ - <500 <5,000 <500 <5,000 <500 <500 <1,000 <500 <500 <500 <500 - - <5,000 <1,000 <500 <500 <500 <500 <500 <5,000 -- 11/16/2004 - µg/m³ - <500 <5,000 <500 <5,000 <500 <500 <1,000 <500 <500 <500 <500 - - <5,000 <1,000 <500 <500 <500 <500 <500 <5,000 -- 11/16/2004 - µg/m³ - <500 <5,000 <500 <5,000 <500 <500 <1,000 <500 <500 <500 <500 - - <5,000 <1,000 <500 <500 <500 <500 7,600 <5,000 -- 11/16/2004 - µg/m³ - <500 <5,000 <500 <5,000 <500 <500 <1,000 <500 <500 <500 <500 - - <5,000 <1,000 <500 <500 <500 <500 <500 <5,000 -- 11/16/2004 - µg/m³ - <500 <5,000 <500 <5,000 <500 <500 <1,000 <500 <500 <500 <500 - - <5,000 <1,000 <500 <500 <500 <500 <500 <5,000 -- 11/15/2004 - µg/m³ - <500 <5,000 <500 <5,000 <500 <500 <1,000 <500 <500 <500 <500 - - <5,000 <1,000 <500 <500 <500 <500 <500 <5,000 -- 12/2/2009 - µg/m³ - <15 <6.1 31 <19 <9.4 <9.4 400 46 <9.2 <11 <10 <34 <99 12 <16 1,200 <10 <13 <13 2,400 <6 -- 11/15/2004 - µg/m³ - <500 <5,000 <500 <5,000 <500 <500 <1,000 <500 <500 <500 <500 - - <5,000 <1,000 <500 <500 <500 <500 <500 <5,000 -- 12/2/2009 - µg/m³ - <30 <13 26 <40 <20 <20 180 31 <19 <22 <22 <70 <210 <17 <33 1,200 <22 <26 <26 1,700 <12 -- 11/15/2004 - µg/m³ - <500 <5,000 <500 <5,000 <500 <500 <1,000 <500 <500 <500 <500 - - <5,000 <1,000 <500 <500 <500 <500 <500 <5,000 -- 11/15/2004 - µg/m³ - <500 <5,000 <500 <5,000 <500 <500 <1,000 <500 <500 <500 <500 - - <5,000 <1,000 <500 <500 <500 <500 <500 <5,000 -- 11/16/2004 - µg/m³ - <500 <5,000 <500 <5,000 <500 <500 <1,000 <500 <500 <500 <500 - - <5,000 <1,000 <500 <500 <500 <500 8,300 <5,000 -- 11/16/2004 - µg/m³ - <500 <5,000 <500 <5,000 <500 <500 <1,000 <500 <500 <500 <500 - - <5,000 <1,000 <500 <500 <500 <500 <500 <5,000 -- 11/15/2004 - µg/m³ - <500 <5,000 <500 <5,000 <500 <500 <1,000 <500 <500 <500 <500 - - <5,000 <1,000 <500 <500 <500 <500 1,900 <5,000 -- 5/21/2009 1,201.4 µg/m³ - <780 <320 <600 <1,000 <500 <500 5,600 9,800 <490 <570 <560 <1,800 <5,300 <430 <850 12,000 <560 <670 <670 180,000 <320 -- 6/16/2010 1,201.4 µg/m³ <620 <620 <620 <620 <620 <620 <620 2,700 15,000 <620 <620 <620 <620 <620 <620 <620 6,300 <620 <620 <620 100,000 <620 One Day Preliminary SVE Test 6/16/2010 1,201.4 µg/m³ <850 <850 <850 <850 <850 <850 <850 2,800 12,000 <850 <850 <850 <850 <850 <850 <850 7,100 <850 <850 <850 130,000 <850 One Day Preliminary SVE Test 6/16/2010 1,201.4 µg/m³ <630 <630 <630 <630 <630 <630 <630 2,700 11,000 <630 <630 <630 <630 <630 <630 <630 7,500 <630 <630 <630 120,000 <630 One Day Preliminary SVE Test 11/8/2011 1,201.4 µg/m³ <1,570 <3,150 <1,320 <2,440 <2,070 <2,030 <2,030 <1,990 7,130 <1,980 <2,310 <2,270 <7,200 <10,700 <1,740 <3,440 7,460 <2,270 <2,730 <2,730 140,000 <1,280 -- Vinyl Chloride 1,1,1-Trichloroethane trans-1,3-Dichloropropene Hexachlorobutadiene <5,000 Tetrachloroethene 1,4-Dioxane 1,1,2,2-Tetrachloroethane trans-1,2-Dichloroethene <500 Methylene chloride cis-1,2-Dichloroethene - cis-1,3-Dichloropropene 1,1-Dichloroethane µg/m³ 1,2-Dichloropropane Chloromethane - 1,1-Dichloroethene Chloroform 11/16/2004 1,2-Dichloroethane Units Chloroethane Sample Elevation (ft amsl) Carbon tetrachloride Sample Date Allyl chloride Well Name Cave Creek Landfill, Maricopa County Comments P-10 P-11 P-12 P-13-D P-13-S P-17-D P-17-S P-18-D P-18-S P-19-D P-19-S P-22 P-23 P-25 PW Wednesday, October 03, 2012 Page 4 of 5 Appendix G. Soil Vapor Results - Summary of Chlorinated Solvent and Related Compound Data 1,1,2-Trichloroethane 1,1,1-Trichloroethane trans-1,3-Dichloropropene 1,1,2,2-Tetrachloroethane Methylene chloride Hexachlorobutadiene cis-1,3-Dichloropropene 1,2-Dichloropropane trans-1,2-Dichloroethene cis-1,2-Dichloroethene <1,570 <3,150 <1,320 <2,440 <2,070 <2,030 <2,030 24,200 285,000 <1,980 <2,310 <2,270 <7,200 <10,700 3,820 <3,440 37,300 <2,270 <2,730 <2,730 752,000 13,300 Extended SVE Pilot Test 2/23/2010 1,332.0 µg/m³ - <780 <330 660 <1,000 860 <500 4,300 250,000 <490 <570 <560 <1,800 <5,300 18,000 <850 8,000 <560 <680 <680 77,000 18,000 -- 6/16/2010 1,332.0 µg/m³ <220 <220 <220 330 <220 340 <220 2,700 90,000 <220 <220 <220 <220 <220 4,100 <220 3,200 <220 <220 <220 32,000 3,400 One Day Preliminary SVE Test 6/16/2010 1,332.0 µg/m³ <1,200 <1,200 <1,200 <1,200 <1,200 1,400 <1,200 24,000 230,000 <1,200 <1,200 <1,200 <1,200 <1,200 15,000 <1,200 19,000 <1,200 <1,200 <1,200 200,000 12,000 One Day Preliminary SVE Test 6/16/2010 1,332.0 µg/m³ <1,700 <1,700 <1,700 <1,700 <1,700 2,100 <1,700 37,000 340,000 <1,700 <1,700 <1,700 <1,700 <1,700 24,000 <1,700 30,000 <1,700 <1,700 <1,700 310,000 18,000 One Day Preliminary SVE Test 6/16/2010 1,332.0 µg/m³ <1,500 <1,500 <1,500 <1,500 <1,500 1,900 <1,500 34,000 310,000 <1,500 <1,500 <1,500 <1,500 <1,500 22,000 <1,500 26,000 <1,500 <1,500 <1,500 270,000 16,000 One Day Preliminary SVE Test 11/8/2011 1,332.0 µg/m³ <1,570 <3,150 <1,320 <2,440 <2,070 <2,030 <2,030 2,940 111,000 <1,980 <2,310 <2,270 <7,200 <10,700 6,590 <3,440 5,360 <2,270 <2,730 <2,730 47,000 7,170 -- 2/20/2012 1,332.0 µg/m³ <1,570 <3,150 <1,320 2,930 <2,070 3,440 2,030 79,400 1,350,000 <1,980 <2,310 <2,270 <7,200 <10,700 41,600 <3,440 67,100 <2,270 <2,730 <2,730 1,340,000 33,300 Extended SVE Pilot Test 2/29/2012 1,332.0 µg/m³ <15,700 <31,500 <13,200 <24,400 <20,700 <20,300 <20,300 262,000 1,230,000 <19,800 <23,100 <22,700 <72,000 <107,000 111,000 <34,400 237,000 <22,700 <27,300 <27,300 2,630,000 58,900 Extended SVE Pilot Test 2/23/2010 1,531.0 µg/m³ - <430 <180 2,200 <560 <280 <280 1,300 1,600 <270 <310 <310 <980 <2,900 <240 <470 6,000 <310 <370 <370 200,000 250 -- 6/16/2010 1,531.0 µg/m³ <620 <620 <620 1,300 <620 <620 <620 <620 1,200 <620 <620 <620 <620 <620 <620 <620 3,900 <620 <620 <620 110,000 <620 One Day Preliminary SVE Test 6/16/2010 1,531.0 µg/m³ <580 <580 <580 1,400 <580 <580 <580 640 1,900 <580 <580 <580 <580 <580 <580 <580 4,400 <580 <580 <580 120,000 <580 One Day Preliminary SVE Test 6/16/2010 1,531.0 µg/m³ <940 <940 <940 1,900 <940 <940 <940 <940 2,900 <940 <940 <940 <940 <940 <940 <940 6,300 <940 <940 <940 170,000 <940 One Day Preliminary SVE Test 6/16/2010 1,531.0 µg/m³ <930 <930 <930 1,400 <930 <930 <930 <930 1,900 <930 <930 <930 <930 <930 <930 <930 4,200 <930 <930 <930 120,000 <930 One Day Preliminary SVE Test 11/8/2011 1,531.0 µg/m³ <3,130 <6,290 <2,640 <4,880 <4,140 <4,050 <4,050 <3,970 <3,960 <3,960 <4,620 <4,540 <14,400 <21,300 <3,470 <6,870 10,800 <4,540 <5,460 <5,460 279,000 <2,560 -- 1/16/2012 1,531.0 µg/m³ <6,260 <12,600 <5,280 <9,760 <8,280 <8,100 <8,100 <7,940 <7,920 <7,920 <9,240 <9,080 <28,800 <42,700 <6,940 <13,700 18,306 <9,080 <10,900 <10,900 446,000 <5,120 Extended SVE Pilot Test 1/20/2012 1,531.0 µg/m³ <6,260 <12,600 <5,280 <9,760 <8,280 <8,100 <8,100 <7,940 15,400 <7,920 <9,240 <9,080 <28,800 <42,700 <6,940 <13,700 21,700 <9,080 <10,900 <10,900 510,000 <5,120 Extended SVE Pilot Test 1/31/2012 1,531.0 µg/m³ <6,260 <12,600 <5,280 <9,760 <8,280 <8,100 <8,100 <7,940 43,600 <7,920 <9,240 <9,080 <28,800 <42,700 <6,940 <13,700 36,600 <9,080 <10,900 <10,900 698,000 <5,120 Extended SVE Pilot Test 2/20/2012 1,531.0 µg/m³ <3,130 <6,290 <2,640 <4,880 <4,140 <4,050 <4,050 5,560 47,500 <3,960 <4,620 <4,540 <14,400 <21,300 <3,470 <6,870 27,800 <4,540 <5,460 <5,460 752,000 5,630 Extended SVE Pilot Test 2/23/2010 1,731.0 µg/m³ - <200 <83 200 <260 <130 <130 1,900 170 <120 <140 <140 <450 <1,300 <110 <220 3,800 <140 <170 <170 130,000 250 -- 6/16/2010 1,731.0 µg/m³ <270 <270 <270 480 <270 <270 <270 290 <270 <270 <270 <270 <270 <270 <270 <270 1,200 <270 <270 <270 36,000 <270 One Day Preliminary SVE Test 6/16/2010 1,731.0 µg/m³ <1,000 <1,000 <1,000 <1,000 <1,000 <1,000 <1,000 1,200 <1,000 <1,000 <1,000 <1,000 <1,000 <1,000 <1,000 <1,000 5,400 <1,000 <1,000 <1,000 160,000 <1,000 One Day Preliminary SVE Test 6/16/2010 1,731.0 µg/m³ <740 <740 <740 <740 <740 <740 <740 1,100 <740 <740 <740 <740 <740 <740 <740 <740 4,900 <740 <740 <740 140,000 <740 One Day Preliminary SVE Test 6/16/2010 1,731.0 µg/m³ <1,200 <1,200 <1,200 <1,200 <1,200 <1,200 <1,200 1,700 <1,200 <1,200 <1,200 <1,200 <1,200 <1,200 <1,200 <1,200 7,900 <1,200 <1,200 <1,200 230,000 <1,200 One Day Preliminary SVE Test 11/8/2011 1,731.0 µg/m³ <3,130 <6,290 <2,640 <4,880 <4,140 <4,050 <4,050 4,760 <3,960 <3,960 <4,620 <4,540 <14,400 <21,300 <3,470 <6,870 17,600 <4,540 <5,460 <5,460 435,000 <2,560 -- 11/16/2011 1,731.0 µg/m³ <3,130 <6,290 <2,640 <4,880 <4,140 <4,050 <4,050 4,760 <3,960 <3,960 <4,620 <4,540 <14,400 <21,300 <3,470 <6,870 11,500 <4,540 <5,460 <5,460 456,000 <2,560 Extended SVE Pilot Test 11/23/2011 1,731.0 µg/m³ <3,130 <6,290 <2,640 <4,880 <4,140 <4,050 <4,050 5,560 <3,960 <3,960 <4,620 <4,540 <14,400 <21,300 <3,470 <6,870 21,000 <4,540 <5,460 <5,460 806,000 <2,560 Extended SVE Pilot Test 12/13/2011 1,731.0 µg/m³ <6,260 <12,600 <5,280 <9,760 <8,280 <8,100 <8,100 8,340 <7,920 <7,920 <9,240 <9,080 <28,800 <42,700 <6,940 <13,700 27,100 <9,080 <10,900 <10,900 913,000 <5,120 Extended SVE Pilot Test Vinyl Chloride µg/m³ Trichloroethene 1,201.4 Tetrachloroethene 11/23/2011 1,4-Dioxane 1,1-Dichloroethane 1,1-Dichloroethene Chloromethane 1,2-Dichloroethane Units Chloroethane Sample Elevation (ft amsl) Chloroform Carbon tetrachloride Sample Date Allyl chloride Well Name Cave Creek Landfill, Maricopa County Comments PW TSSV-01-D TSSV-01-M TSSV-01-S Notes: Grey text indicates a non-detected compound µg/m³ - micrograms per cubic meter ft amsl - feet above mean sea level - = data not applicable or available Wednesday, October 03, 2012 Page 5 of 5 APPENDIX H SOIL VAPOR ANALYTICAL RESULTS SUMMARY OF AROMATIC COMPOUND AND FUEL RELATED DATA Appendix H. Soil Vapor Analytical Results - Summary of Aromatic and Fuel Related Compound Data Sample Date Sample Elevation (ft amsl) Units Benzene Benzyl chloride Chlorobenzene Cumene Cyclohexane Ethyl Benzene 1,2-Dichlorobenzene 1,3-Dichlorobenzene 1,4-Dichlorobenzene 4-Ethyltoluene Heptane Hexane Methyl tert-butyl ether o-Xylene Propene (Propylene) Propylbenzene Toluene 1,2,4-Trichlorobenzene 1,2,4-Trimethylbenzene 1,3,5-Trimethylbenzene 2,2,4-Trimethylpentane m,p-Xylene Styrene Well Name Cave Creek Landfill, Maricopa County 6/16/2010 - µg/m³ <1.9 <1.9 <1.9 <1.9 <3.9 <1.9 <1.9 <1.9 <1.9 <1.9 - - <1.9 <1.9 <1.9 - <1.9 <1.9 2.2 <1.9 - <3.9 <1.9 Ambient Sample; One Day Preliminary SVE Test 1/5/2012 - µg/m³ <1.6 <10.4 <2.3 - <1.7 <2.2 <3 <3 <3 <2.5 <2.1 <1.8 <3.6 <2.2 <.9 - <1.9 <14.8 <2.5 <2.5 <2.3 <4.3 <2.1 -- 3/9/2012 - µg/m³ <1.6 <10.4 <2.3 - <1.7 <2.2 <3 <3 <3 <4.9 <2.1 <1.8 <7.2 <2.2 <.9 - <1.9 <14.8 <2.5 <2.5 <2.3 <4.3 <2.1 -- 12/3/2009 1,886.0 µg/m³ 1,600 - 210 <130 3,600 3,900 <160 <160 <160 <130 7,500 4,100 480 1,300 - <130 18,000 <790 180 <130 2,200 5,700 <110 -- 12/3/2009 1,891.0 µg/m³ 1,600 - <170 <180 8,400 4,200 <220 <220 <220 <180 11,000 5,500 820 1,300 - <180 46,000 <1,100 <180 <180 4,800 6,500 <160 -- 12/3/2009 1,867.0 µg/m³ 310 - 230 <58 560 3,800 <72 <72 <72 190 1,200 300 78 1,600 - <58 20,000 <350 220 78 360 7,200 <51 -- 12/3/2009 1,868.0 µg/m³ 530 - 220 <110 460 4,300 <140 <140 <140 320 1,200 490 110 1,800 - 130 12,000 <680 340 140 330 7,100 <98 -- 12/3/2009 1,867.0 µg/m³ 590 - 240 <120 1,400 5,400 <140 <140 <140 390 3,000 1,300 160 2,300 - <120 19,000 <710 420 160 1,300 9,400 <100 -- 12/3/2009 1,866.0 µg/m³ 370 - 240 <110 530 5,100 <140 <140 <140 490 2,000 1,300 <82 2,400 - <110 9,700 <680 530 180 560 8,800 <98 -- 5/19/2009 1,226.0 µg/m³ 6.1 - <5.8 32 <4.4 16 <7.6 <7.6 <7.6 <6.2 7.7 8 <4.6 31 - 6.3 50 <38 <6.2 <6.2 <5.9 65 14 -- 11/15/2004 1,772.0 µg/m³ - - <500 - - <1,000 <500 <500 <500 - - - - - - - <1,000 - - - - <1,500 - -- 12/8/2004 1,772.0 µg/m³ - - <500 - - <1,000 <500 <500 <500 - - - - - - - <1,000 - - - - <1,500 - -- 6/9/2005 1,772.0 µg/m³ - - <500 - - <1,000 <500 <500 <500 - - - - - - - - - - - - <1,500 - -- 6/10/2005 1,772.0 µg/m³ - - - - - - - - - - - - - - - - 2,200 - - - - - - -- 1/17/2008 1,772.0 µg/m³ - - - - - - - - - - - - - - - - 7,700 - - - - - - -- 12/1/2009 1,772.0 µg/m³ <250 - 1,000 <390 330 <340 <470 <480 <480 <390 <320 <280 <280 <340 - <390 <300 <2,300 <390 <390 <370 <340 <340 -- 11/8/2011 1,772.0 µg/m³ <797.5 <5,180 <1,150 - <860 <1,090 <1,500 <1,500 <1,500 <1,230 <1,030 <880 <1,810 <1,090 <430 - <942.5 <7,420 <1,230 <1,230 <1,170 <2,170 <1,070 -- 11/15/2004 1,822.0 µg/m³ - - <500 - - <1,000 <500 <500 <500 - - - - - - - <1,000 - - - - <1,500 - -- 12/8/2004 1,822.0 µg/m³ - - <500 - - <1,000 <500 <500 <500 - - - - - - - <1,000 - - - - <1,500 - -- 6/9/2005 1,822.0 µg/m³ - - <500 - - <1,000 <500 <500 <500 - - - - - - - - - - - - <1,500 - -- 6/10/2005 1,822.0 µg/m³ - - - - - - - - - - - - - - - - 2,100 - - - - - - -- 1/17/2008 1,822.0 µg/m³ - - - - - - - - - - - - - - - - 4,600 - - - - - - -- 12/1/2009 1,822.0 µg/m³ <190 - 840 <300 400 <260 <360 <360 <360 <300 <250 320 <220 <260 - <300 <230 <1,800 <300 <300 <280 <260 <260 -- 11/8/2011 1,822.0 µg/m³ <159.5 <1,040 <230 - 378.4 <217 <300.5 <300.5 <300.5 <246 <205 563.2 <361 <217 <86 - <188.5 <1,480 <246 <246 <233 <434 <213 -- 11/15/2004 1,772.0 µg/m³ - - <500 - - <1,000 <500 <500 <500 - - - - - - - <1,000 - - - - <1,500 - -- 12/8/2004 1,772.0 µg/m³ - - <500 - - <1,000 <500 <500 <500 - - - - - - - <1,000 - - - - <1,500 - -- Comments Ambient GW-08 GW-13 GW-19 GW-22 GW-25 GW-29 MW-02 NDP-01-D NDP-01-S NDP-02-D Tuesday, November 13, 2012 Page 1 of 5 Appendix H. Soil Vapor Analytical Results - Summary of Aromatic and Fuel Related Compound Data Sample Date Sample Elevation (ft amsl) Units Benzene Benzyl chloride Chlorobenzene Cumene Cyclohexane Ethyl Benzene 1,2-Dichlorobenzene 1,3-Dichlorobenzene 1,4-Dichlorobenzene 4-Ethyltoluene Heptane Hexane Methyl tert-butyl ether o-Xylene Propene (Propylene) Propylbenzene Toluene 1,2,4-Trichlorobenzene 1,2,4-Trimethylbenzene 1,3,5-Trimethylbenzene 2,2,4-Trimethylpentane m,p-Xylene Styrene Well Name Cave Creek Landfill, Maricopa County 6/9/2005 1,772.0 µg/m³ - - <500 - - <1,000 <500 <500 <500 - - - - - - - - - - - - <1,500 - -- 6/10/2005 1,772.0 µg/m³ - - - - - - - - - - - - - - - - <1,000 - - - - - - -- 1/17/2008 1,772.0 µg/m³ - - - - - - - - - - - - - - - - <1,000 - - - - - - -- 12/1/2009 1,772.0 µg/m³ <380 - 600 <580 <400 <510 <710 <710 <710 <580 <480 <410 <420 <510 - <580 <440 <3,500 <580 <580 <550 <510 <500 -- 11/15/2004 1,822.0 µg/m³ - - <500 - - <1,000 <500 <500 <500 - - - - - - - <1,000 - - - - <1,500 - -- 12/8/2004 1,822.0 µg/m³ - - <500 - - <1,000 <500 <500 <500 - - - - - - - <1,000 - - - - <1,500 - -- 6/9/2005 1,822.0 µg/m³ - - <500 - - <1,000 <500 <500 <500 - - - - - - - - - - - - <1,500 - -- 6/10/2005 1,822.0 µg/m³ - - - - - - - - - - - - - - - - <1,000 - - - - - - -- 1/17/2008 1,822.0 µg/m³ - - - - - - - - - - - - - - - - <1,000 - - - - - - -- 12/1/2009 1,822.0 µg/m³ <260 - 380 <400 280 <350 <480 <480 <480 <400 <330 <280 <290 <350 - <400 700 <2,400 <400 <400 <380 <350 <340 -- 11/18/2004 1,773.0 µg/m³ - - <500 - - <1,000 <500 <500 <500 - - - - - - - <1,000 - - - - <1,500 - -- 12/8/2004 1,773.0 µg/m³ - - <500 - - <1,000 <500 <500 <500 - - - - - - - <1,000 - - - - <1,500 - -- 12/1/2009 1,773.0 µg/m³ <490 - <710 <760 960 <670 <920 <920 <920 <760 <630 <540 <560 <670 - <760 <580 <4,600 <760 <760 16,000 <670 <660 -- 11/18/2004 1,823.0 µg/m³ - - <500 - - <1,000 <500 <500 <500 - - - - - - - <1,000 - - - - <1,500 - -- 12/8/2004 1,823.0 µg/m³ - - <500 - - <1,000 <500 <500 <500 - - - - - - - <1,000 - - - - <1,500 - -- 12/1/2009 1,823.0 µg/m³ <130 - 560 <200 210 <180 <250 <250 <250 <200 360 460 <150 <180 - <200 <160 <1,200 <200 <200 440 <180 <180 -- 11/18/2004 1,767.0 µg/m³ - - <500 - - <1,000 <500 <500 <500 - - - - - - - <1,000 - - - - <1,500 - -- 12/8/2004 1,767.0 µg/m³ - - <500 - - <1,000 <500 <500 <500 - - - - - - - <1,000 - - - - <1,500 - -- 12/1/2009 1,767.0 µg/m³ 270 - 4,100 23 63 <20 <28 <28 <28 <23 140 170 <17 45 - <23 120 <140 <23 <23 62 43 <20 -- 11/18/2004 1,817.0 µg/m³ - - <500 - - <1,000 <500 <500 <500 - - - - - - - <1,000 - - - - <1,500 - -- 12/8/2004 1,817.0 µg/m³ - - <500 - - <1,000 <500 <500 <500 - - - - - - - <1,000 - - - - <1,500 - -- 12/1/2009 1,817.0 µg/m³ 110 - 3,700 36 43 <14 <19 <19 <19 <16 95 140 <11 39 - <16 120 <94 <16 <16 47 41 <13 -- 11/18/2004 1,762.0 µg/m³ - - <500 - - <1,000 <500 <500 <500 - - - - - - - <1,000 - - - - <1,500 - -- 12/8/2004 1,762.0 µg/m³ - - <500 - - <1,000 <500 <500 <500 - - - - - - - <1,000 - - - - <1,500 - -- 1/17/2008 1,762.0 µg/m³ - - - - - - - - - - - - - - - - <1,000 - - - - - - -- 12/1/2009 1,762.0 µg/m³ 55 - 2,500 30 35 <15 <21 <21 <21 <17 37 48 <12 38 - <17 67 <100 <17 <17 <16 42 <15 -- 11/8/2011 1,762.0 µg/m³ <79.8 <518 156.4 - <86 <108.5 <150.3 <150.3 282.5 <123 <102.5 <88 <180.5 <108.5 <43 - <94.3 <742 <123 <123 <116.5 <217 <106.5 -- 11/18/2004 1,812.0 µg/m³ - - <500 - - <1,000 <500 <500 <500 - - - - - - - <1,000 - - - - <1,500 - -- 12/8/2004 1,812.0 µg/m³ - - <500 - - <1,000 <500 <500 <500 - - - - - - - <1,000 - - - - <1,500 - -- Comments NDP-02-D NDP-02-S ODP-01-D ODP-01-S ODP-02-D ODP-02-S ODP-03-D ODP-03-S Tuesday, November 13, 2012 Page 2 of 5 Appendix H. Soil Vapor Analytical Results - Summary of Aromatic and Fuel Related Compound Data Sample Date Sample Elevation (ft amsl) Units Benzene Benzyl chloride Chlorobenzene Cumene Cyclohexane Ethyl Benzene 1,2-Dichlorobenzene 1,3-Dichlorobenzene 1,4-Dichlorobenzene 4-Ethyltoluene Heptane Hexane Methyl tert-butyl ether o-Xylene Propene (Propylene) Propylbenzene Toluene 1,2,4-Trichlorobenzene 1,2,4-Trimethylbenzene 1,3,5-Trimethylbenzene 2,2,4-Trimethylpentane m,p-Xylene Styrene Well Name Cave Creek Landfill, Maricopa County 1/17/2008 1,812.0 µg/m³ - - - - - - - - - - - - - - - - <1,000 - - - - - - -- 12/1/2009 1,812.0 µg/m³ 41 - 1,300 19 22 8.1 <9.5 <9.5 <9.5 <7.8 31 38 <5.7 23 - <7.8 44 <47 <7.8 <7.8 10 29 <6.7 -- 11/8/2011 1,812.0 µg/m³ 30.9 <51.8 50.6 - 14.4 <10.9 66.1 <15 282.5 <12.3 <10.3 25.3 <18.1 <10.9 <4.3 - 10.6 <74.2 <12.3 <12.3 <11.7 <21.7 <10.7 -- 11/18/2004 1,767.0 µg/m³ - - <500 - - <1,000 <500 <500 <500 - - - - - - - <1,000 - - - - <1,500 - -- 12/8/2004 1,767.0 µg/m³ - - <500 - - <1,000 <500 <500 <500 - - - - - - - <1,000 - - - - <1,500 - -- 1/17/2008 1,767.0 µg/m³ - - - - - - - - - - - - - - - - <1,000 - - - - - - -- 12/1/2009 1,767.0 µg/m³ 100 - 1,000 <86 180 <76 <100 <100 <100 <86 360 220 <63 <76 - <86 <66 <520 <86 <86 170 <76 <74 -- 11/18/2004 1,817.0 µg/m³ - - <500 - - <1,000 <500 <500 <500 - - - - - - - <1,000 - - - - <1,500 - -- 12/8/2004 1,817.0 µg/m³ - - <500 - - <1,000 <500 <500 <500 - - - - - - - <1,000 - - - - <1,500 - -- 1/17/2008 1,817.0 µg/m³ - - - - - - - - - - - - - - - - <1,000 - - - - - - -- 12/1/2009 1,817.0 µg/m³ 68 - 1,000 36 69 <14 <20 <20 <20 <16 110 78 <12 24 - <16 39 <99 <16 <16 170 37 <14 -- 11/16/2004 - µg/m³ - - <500 - - <1,000 <500 <500 <500 - - - - - - - <1,000 - - - - <1,500 - -- 12/2/2009 - µg/m³ 9.5 - 630 28 8.6 44 <15 <15 15 17 <10 <8.7 <8.9 46 - <12 80 <73 18 <12 <12 94 11 -- 11/16/2004 - µg/m³ - - <500 - - <1,000 <500 <500 <500 - - - - - - - <1,000 - - - - <1,500 - -- 12/2/2009 - µg/m³ 7.1 - 280 12 <4.1 20 <7.2 <7.2 <7.2 7.8 <4.9 <4.2 <4.3 21 - <5.8 49 <35 8.4 <5.8 <5.6 45 <5.1 -- 11/8/2011 - µg/m³ <3.2 <20.7 <4.6 - <3.4 <4.3 <6 <6 <6 <4.9 <4.1 <3.5 <7.2 <4.3 4 - <3.8 <29.7 <4.9 <4.9 <4.7 <8.7 <4.3 -- 3/9/2012 - µg/m³ <1.6 <10.4 <2.3 - <1.7 <2.2 <3 <3 <3 <4.9 <2.1 <1.8 <7.2 <2.2 <.9 - 3.4 <14.8 <2.5 <2.5 <2.3 <4.3 <2.1 -- 11/18/2004 - µg/m³ - - <500 - - <1,000 <500 <500 <500 - - - - - - - <1,000 - - - - <1,500 - -- 11/16/2004 - µg/m³ - - <500 - - <1,000 <500 <500 <500 - - - - - - - <1,000 - - - - <1,500 - -- 1/5/2012 - µg/m³ <1.6 <10.4 <2.3 - <1.7 <2.2 <3 <3 <3 <2.5 <2.1 <1.8 <3.6 <2.2 <.9 - <1.9 <14.8 <2.5 <2.5 <2.3 <4.3 <2.1 -- 11/16/2004 - µg/m³ - - <500 - - <1,000 <500 <500 <500 - - - - - - - <1,000 - - - - <1,500 - -- 1/5/2012 - µg/m³ <1.6 <10.4 <2.3 - <1.7 <2.2 <3 <3 <3 <2.5 <2.1 <1.8 <3.6 <2.2 <.9 - 2.3 <14.8 <2.5 <2.5 <2.3 <4.3 <2.1 -- 11/16/2004 - µg/m³ - - <500 - - <1,000 <500 <500 <500 - - - - - - - <1,000 - - - - <1,500 - -- 1/5/2012 - µg/m³ <1.6 <10.4 <2.3 - <1.7 <2.2 <3 <3 <3 <2.5 <2.1 <1.8 <3.6 <2.2 <.9 - 3.8 <14.8 <2.5 <2.5 <2.3 <4.3 <2.1 -- 3/9/2012 - µg/m³ 4,150 <2,070 <460 - <344 <434 <601 <601 <601 <984 <410 <352 <1,440 <434 <172 - 603.2 <2,970 <492 <492 <466 <868 <426 -- Comments ODP-03-S ODP-04-D ODP-04-S P-02-D P-02-S P-03 P-05 P-06 P-07 P-08 P-09 Tuesday, November 13, 2012 Page 3 of 5 Appendix H. Soil Vapor Analytical Results - Summary of Aromatic and Fuel Related Compound Data Sample Date Sample Elevation (ft amsl) Units Benzene Benzyl chloride Chlorobenzene Cumene Cyclohexane Ethyl Benzene 1,2-Dichlorobenzene 1,3-Dichlorobenzene 1,4-Dichlorobenzene 4-Ethyltoluene Heptane Hexane Methyl tert-butyl ether o-Xylene Propene (Propylene) Propylbenzene Toluene 1,2,4-Trichlorobenzene 1,2,4-Trimethylbenzene 1,3,5-Trimethylbenzene 2,2,4-Trimethylpentane m,p-Xylene Styrene Well Name Cave Creek Landfill, Maricopa County 11/16/2004 - µg/m³ - - <500 - - <1,000 <500 <500 <500 - - - - - - - <1,000 - - - - <1,500 - -- 1/5/2012 - µg/m³ <1.6 <10.4 <2.3 - <1.7 <2.2 <3 <3 <3 <2.5 <2.1 2.1 <3.6 <2.2 <.9 - 7.2 <14.8 <2.5 <2.5 <2.3 <4.3 <2.1 Duplicate Sample 1/5/2012 - µg/m³ <1.6 <10.4 <2.3 - <1.7 <2.2 <3 <3 <3 <2.5 <2.1 2.5 <3.6 <2.2 <.9 - 8.3 <14.8 <2.5 <2.5 <2.3 <4.3 <2.1 -- 11/16/2004 - µg/m³ - - <500 - - <1,000 <500 <500 <500 - - - - - - - <1,000 - - - - <1,500 - -- 11/16/2004 - µg/m³ - - <500 - - <1,000 <500 <500 <500 - - - - - - - <1,000 - - - - <1,500 - -- 11/16/2004 - µg/m³ - - <500 - - <1,000 <500 <500 <500 - - - - - - - <1,000 - - - - <1,500 - -- 11/16/2004 - µg/m³ - - <500 - - <1,000 <500 <500 <500 - - - - - - - <1,000 - - - - <1,500 - -- 11/16/2004 - µg/m³ - - <500 - - <1,000 <500 <500 <500 - - - - - - - <1,000 - - - - <1,500 - -- 11/16/2004 - µg/m³ - - <500 - - <1,000 <500 <500 <500 - - - - - - - <1,000 - - - - <1,500 - -- 11/15/2004 - µg/m³ - - <500 - - <1,000 <500 <500 <500 - - - - - - - <1,000 - - - - <1,500 - -- 12/2/2009 - µg/m³ <7.4 - 350 15 <8 22 <14 <14 <14 <11 <9.5 <8.2 <8.4 22 - <11 47 <69 <11 <11 <11 46 <9.9 -- 11/15/2004 - µg/m³ - - <500 - - <1,000 <500 <500 <500 - - - - - - - <1,000 - - - - <1,500 - -- 12/2/2009 - µg/m³ <15 - 310 <24 <17 21 <29 <29 <29 <24 <20 <17 <17 23 - <24 38 <140 <24 <24 <23 45 <21 -- 11/15/2004 - µg/m³ - - <500 - - <1,000 <500 <500 <500 - - - - - - - <1,000 - - - - <1,500 - -- 11/15/2004 - µg/m³ - - <500 - - <1,000 <500 <500 <500 - - - - - - - <1,000 - - - - <1,500 - -- 11/16/2004 - µg/m³ - - <500 - - <1,000 <500 <500 <500 - - - - - - - <1,000 - - - - <1,500 - -- 11/16/2004 - µg/m³ - - <500 - - <1,000 <500 <500 <500 - - - - - - - <1,000 - - - - <1,500 - -- 11/15/2004 - µg/m³ - - <500 - - <1,000 <500 <500 <500 - - - - - - - <1,000 - - - - <1,500 - -- 5/21/2009 1,201.4 µg/m³ <390 - <570 <610 <420 <540 <740 <740 <740 <610 <510 <440 <440 <540 - <610 <460 <3,700 <610 <610 <580 <540 <530 -- 6/16/2010 1,201.4 µg/m³ <620 <620 1,500 <620 <1,200 <620 <620 <620 <620 <620 - - <620 <620 <620 - <620 <620 <620 <620 - <1,200 <620 One Day Preliminary SVE Test 6/16/2010 1,201.4 µg/m³ <850 <850 1,100 <850 <1,700 <850 <850 <850 <850 <850 - - <850 <850 <850 - <850 <850 <850 <850 - <1,700 <850 One Day Preliminary SVE Test 6/16/2010 1,201.4 µg/m³ <630 <630 <630 <630 <1,300 <630 <630 <630 <630 <630 - - <630 <630 <630 - <630 <630 <630 <630 - <1,300 <630 One Day Preliminary SVE Test Comments P-10 P-11 P-12 P-13-D P-13-S P-17-D P-17-S P-18-D P-18-S P-19-D P-19-S P-22 P-23 P-25 PW Tuesday, November 13, 2012 Page 4 of 5 Appendix H. Soil Vapor Analytical Results - Summary of Aromatic and Fuel Related Compound Data Sample Date Sample Elevation (ft amsl) Units Benzene Benzyl chloride Chlorobenzene Cumene Cyclohexane Ethyl Benzene 1,2-Dichlorobenzene 1,3-Dichlorobenzene 1,4-Dichlorobenzene 4-Ethyltoluene Heptane Hexane Methyl tert-butyl ether o-Xylene Propene (Propylene) Propylbenzene Toluene 1,2,4-Trichlorobenzene 1,2,4-Trimethylbenzene 1,3,5-Trimethylbenzene 2,2,4-Trimethylpentane m,p-Xylene Styrene Well Name Cave Creek Landfill, Maricopa County 11/8/2011 1,201.4 µg/m³ <1,600 <10,400 <2,300 - <1,720 <2,170 <3,010 <3,010 <3,010 <2,460 <2,050 <1,760 <3,610 <2,170 <860 - <1,890 <14,800 <2,460 <2,460 <2,330 <4,340 <2,130 -- 11/23/2011 1,201.4 µg/m³ <1,600 <10,400 8,280 - <1,720 <2,170 <3,010 <3,010 <3,010 <2,460 <2,050 <1,760 <3,610 <2,170 <860 - <1,890 <14,800 <2,460 <2,460 <2,330 <4,340 <2,130 Extended SVE Pilot Test 2/23/2010 1,332.0 µg/m³ 1,500 - 30,000 <610 <430 <540 <740 <740 <740 <610 <510 <440 <450 <540 - <610 730 <3,700 <610 <610 <580 630 <530 -- 6/16/2010 1,332.0 µg/m³ 450 <220 18,000 <220 <440 <220 2,600 <220 280 <220 - - <220 <220 <220 - <220 <220 <220 <220 - <440 <220 One Day Preliminary SVE Test 6/16/2010 1,332.0 µg/m³ <1,200 <1,200 21,000 <1,200 <2,300 <1,200 1,900 <1,200 <1,200 <1,200 - - <1,200 <1,200 <1,200 - <1,200 <1,200 <1,200 <1,200 - <2,300 <1,200 One Day Preliminary SVE Test 6/16/2010 1,332.0 µg/m³ <1,700 <1,700 31,000 <1,700 <3,500 <1,700 3,700 <1,700 <1,700 <1,700 - - <1,700 <1,700 <1,700 - <1,700 <1,700 <1,700 <1,700 - <3,500 <1,700 One Day Preliminary SVE Test 6/16/2010 1,332.0 µg/m³ <1,500 <1,500 25,000 <1,500 <3,100 <1,500 2,400 <1,500 <1,500 <1,500 - - <1,500 <1,500 <1,500 - <1,500 <1,500 <1,500 <1,500 - <3,100 <1,500 One Day Preliminary SVE Test 11/8/2011 1,332.0 µg/m³ <1,600 <10,400 42,300 - <1,720 <2,170 6,010 <3,010 <3,010 <2,460 <2,050 <1,760 <3,610 <2,170 <860 - <1,890 <14,800 <2,460 <2,460 <2,330 <4,340 <2,130 -- 2/20/2012 1,332.0 µg/m³ <1,600 <10,400 87,400 - <1,720 <2,170 14,400 <3,010 <3,010 <2,460 <2,050 <1,760 <3,610 <2,170 <860 - <1,890 <14,840 <2,460 <2,460 <2,330 <4,340 <2,130 Extended SVE Pilot Test 2/29/2012 1,332.0 µg/m³ <16,000 <104,000 120,000 - <17,200 <21,700 <30,100 <30,100 <30,100 <49,200 <20,500 <17,600 <72,200 <21,700 <8,600 - <18,900 <148,000 <24,600 <24,600 <23,300 <43,400 <21,300 Extended SVE Pilot Test 2/23/2010 1,531.0 µg/m³ <220 - 700 <330 <230 <300 <410 <410 <410 <330 <280 <240 <240 <300 - <330 <260 <2,000 <330 <330 <320 <300 <290 -- 6/16/2010 1,531.0 µg/m³ <620 <620 1,000 <620 <1,200 <620 <620 <620 <620 <620 - - <620 <620 <620 - <620 <620 <620 <620 - <1,200 <620 One Day Preliminary SVE Test 6/16/2010 1,531.0 µg/m³ <580 <580 1,600 <580 <1,200 <580 <580 <580 <580 <580 - - <580 <580 <580 - <580 <580 <580 <580 - <1,200 <580 One Day Preliminary SVE Test 6/16/2010 1,531.0 µg/m³ <940 <940 2,500 <940 <1,900 <940 <940 <940 <940 <940 - - <940 <940 <940 - <940 <940 <940 <940 - <1,900 <940 One Day Preliminary SVE Test 6/16/2010 1,531.0 µg/m³ <930 <930 1,500 <930 <1,900 <930 <930 <930 <930 <930 - - <930 <930 <930 - <930 <930 <930 <930 - <1,900 <930 One Day Preliminary SVE Test 11/8/2011 1,531.0 µg/m³ <3,190 <20,700 5,060 - <3,440 <4,340 <6,010 <6,010 <6,010 <4,920 <4,100 <3,520 <7,220 <4,340 <1,720 - <3,770 <29,700 <4,920 <4,920 <4,660 <8,680 <4,260 -- 1/16/2012 1,531.0 µg/m³ <6,380 <41,400 12,400 - <6,880 <8,680 <12,000 <12,000 <12,000 <9,840 <8,200 <7,040 <14,400 <8,680 <3,440 - <7,540 <59,400 <9,840 <9,840 <9,320 <17,400 <8,520 Extended SVE Pilot Test 1/20/2012 1,531.0 µg/m³ <6,380 <41,400 25,800 - <6,880 <8,680 <12,000 <12,000 <12,000 <9,840 <8,200 <7,040 <14,400 <8,680 <3,440 - <7,540 56,400 <9,840 <9,840 <9,320 <17,400 <8,520 Extended SVE Pilot Test 1/31/2012 1,531.0 µg/m³ <6,380 <41,400 55,200 - <6,880 <8,680 42,100 <12,000 <12,000 <9,840 <8,200 <7,040 <14,400 <8,680 <3,440 - <7,540 <59,400 <9,840 <9,840 <9,320 <17,400 <8,520 Extended SVE Pilot Test 2/20/2012 1,531.0 µg/m³ <3,190 <20,700 46,000 - <3,440 <4,340 26,400 <6,010 <6,010 <4,920 <4,100 <3,520 <7,220 <4,340 <1,720 - <3,770 <29,700 <4,920 <4,920 <4,660 <8,680 <4,260 Extended SVE Pilot Test 2/23/2010 1,731.0 µg/m³ <100 - <140 <150 <110 <140 <190 <190 <190 <150 <130 <110 <110 <140 - <150 <120 <930 <150 <150 <150 <140 <130 -- 6/16/2010 1,731.0 µg/m³ <270 <270 <270 <270 <530 <270 <270 <270 <270 <270 - - <270 <270 <270 - <270 <270 <270 <270 - <530 <270 One Day Preliminary SVE Test 6/16/2010 1,731.0 µg/m³ <1,000 <1,000 <1,000 <1,000 <2,000 <1,000 <1,000 <1,000 <1,000 <1,000 - - <1,000 <1,000 <1,000 - <1,000 <1,000 <1,000 <1,000 - <2,000 <1,000 One Day Preliminary SVE Test 6/16/2010 1,731.0 µg/m³ <740 <740 <740 <740 <1,500 <740 <740 <740 <740 <740 - - <740 <740 <740 - <740 <740 <740 <740 - <1,500 <740 One Day Preliminary SVE Test 6/16/2010 1,731.0 µg/m³ <1,200 <1,200 <1,200 <1,200 <2,300 <1,200 <1,200 <1,200 <1,200 <1,200 - - <1,200 <1,200 <1,200 - <1,200 <1,200 <1,200 <1,200 - <2,300 <1,200 One Day Preliminary SVE Test 11/8/2011 1,731.0 µg/m³ <3,190 <20,700 <4,600 - <3,440 <4,340 <6,010 <6,010 <6,010 <4,920 <4,100 <3,520 <7,220 <4,340 <1,720 - <3,770 <29,700 <4,920 <4,920 <4,660 <8,680 <4,260 -- 11/16/2011 1,731.0 µg/m³ <3,190 <20,700 <4,600 - <3,440 <4,340 <6,010 <6,010 <6,010 <4,920 <4,100 <3,520 <7,220 <4,340 <1,720 - <3,770 <29,700 <4,920 <4,920 <4,660 <8,680 <4,260 Extended SVE Pilot Test 11/23/2011 1,731.0 µg/m³ <3,190 <20,700 <4,600 - <3,440 <4,340 <6,010 <6,010 <6,010 <4,920 <4,100 <3,520 <7,220 <4,340 <1,720 - <3,770 <29,700 <4,920 <4,920 <4,660 <8,680 <4,260 Extended SVE Pilot Test 12/13/2011 1,731.0 µg/m³ <6,380 <41,400 <9,200 - <6,880 <8,680 <12,000 <12,000 <12,000 <9,840 <8,200 <7,040 <14,400 <8,680 <3,440 - <7,540 <59,400 <9,840 <9,840 <9,320 <17,400 <8,520 Extended SVE Pilot Test Comments PW TSSV-01-D TSSV-01-M TSSV-01-S Notes: Grey text indicates a non-detected compound µg/m³ - micrograms per cubic meter ft amsl - feet above mean sea level - = data not applicable or available Tuesday, November 13, 2012 Page 5 of 5 APPENDIX I SOIL VAPOR ANALYTICAL RESULTS SUMMARY OF FREON AND OTHER VOC DATA Appendix I. Soil Vapor Analytical Results - Summary of Freon and Other VOC Data Sample Date Sample Elevation (ft amsl) Units Acetone Bromodichloromethane Bromoethene(Vinyl Bromide) Bromoform Bromomethane 1,3-Butadiene 2-Butanone (MEK) Carbon disulfide Dibromochloromethane 1,2-Dibromoethane (EDB) Ethanol Ethyl Acetate Freon 11 Freon 12 Freon 113 Freon 114 2-Hexanone 4-Methyl-2-pentanone (MIK) 2-Propanol (IPA) Tetrahydrofuran Vinyl acetate Well Name Cave Creek Landfill, Maricopa County 6/16/2010 - µg/m³ 86 <1.9 - <1.9 <1.9 <1.9 <19 <19 <1.9 <1.9 <19 <3.9 <1.9 2.1 - - <1.9 <1.9 <3.9 16 <19 Ambient Sample; One Day Preliminary SVE Test 1/5/2012 - µg/m³ <11.9 <3.4 <2.2 <5.2 <1.9 <1.1 <5.9 <1.6 <4.3 <3.8 - <1.8 <2.8 <5 <3.8 <3.5 <4.1 <8.2 <4.9 <5.9 <1.8 -- 3/9/2012 - µg/m³ 13.6 <3.4 <2.2 <5.2 <1.9 <1.1 <5.9 <1.6 <4.3 <3.8 - <1.8 <2.8 <5 <3.8 <3.5 <8.2 <8.2 <4.9 <5.9 <1.8 -- 12/3/2009 1,886.0 µg/m³ 240 <180 - <270 <100 <59 <78 <82 <220 <200 <200 - 150 12,000 240 1,700 <430 <110 <260 4,500 - -- 12/3/2009 1,891.0 µg/m³ 13,000 <240 - <380 <140 <81 17,000 <110 <310 <280 <280 - 350 7,400 <280 890 <600 1,500 1,000 7,700 - -- 12/3/2009 1,867.0 µg/m³ 12,000 <80 - <120 <46 <26 15,000 <37 <100 <91 7,800 - <67 320 94 <83 <190 900 11,000 5,800 - -- 12/3/2009 1,868.0 µg/m³ 3,000 <150 - <240 <89 <51 3,800 <71 <200 <180 18,000 - <130 430 <180 270 <380 320 16,000 2,200 - -- 12/3/2009 1,867.0 µg/m³ 6,600 <160 - <250 <92 <53 9,100 <74 <200 <180 22,000 - 150 2,000 <180 360 <390 930 16,000 5,400 - -- 12/3/2009 1,866.0 µg/m³ 1,800 <150 - <240 <89 <51 1,300 <71 <200 <180 23,000 - 4,000 2,400 <180 520 <380 <94 12,000 2,200 - -- 5/19/2009 1,226.0 µg/m³ 230 <8.5 - <13 <4.9 <2.8 92 8.2 <11 <9.7 14 - 17 310 53 19 <21 44 23 53 - -- 11/15/2004 1,772.0 µg/m³ - <500 - <1,000 <5,000 - - - <500 - - - - - - - - - - - - -- 12/8/2004 1,772.0 µg/m³ - <500 - <1,000 <5,000 - - - <500 - - - - - - - - - - - - -- 6/9/2005 1,772.0 µg/m³ - <500 - <1,000 <5,000 - - - <500 - - - - - - - - - - - - -- 6/10/2005 1,772.0 µg/m³ - - - - - - - - - - - - - - - - - - - - - -- 1/17/2008 1,772.0 µg/m³ - - - - - - - - - - - - - - - - - - - - - -- 12/1/2009 1,772.0 µg/m³ <750 <530 - <820 <310 <170 <230 <250 <670 <610 <600 - 1,300 4,200 41,000 <550 <1,300 <320 <780 <230 - -- 11/8/2011 1,772.0 µg/m³ <5,950 <1,680 <1,090 <2,590 <970 <552.5 <2,950 <777.5 <2,130 <1,920 - <900 <1,410 4,950 49,800 <1,750 <2,050 <2,050 <2,450 <2,950 <880 -- 11/15/2004 1,822.0 µg/m³ - <500 - <1,000 <5,000 - - - <500 - - - - - - - - - - - - -- 12/8/2004 1,822.0 µg/m³ - <500 - <1,000 <5,000 - - - <500 - - - - - - - - - - - - -- 6/9/2005 1,822.0 µg/m³ - <500 - <1,000 <5,000 - - - <500 - - - - - - - - - - - - -- 6/10/2005 1,822.0 µg/m³ - - - - - - - - - - - - - - - - - - - - - -- 1/17/2008 1,822.0 µg/m³ - - - - - - - - - - - - - - - - - - - - - -- 12/1/2009 1,822.0 µg/m³ <570 <400 - <620 <230 <130 <180 <190 <520 <460 <460 - 1,300 4,200 35,000 560 <990 <250 <590 <180 - -- 11/8/2011 1,822.0 µg/m³ <1,190 <335 <218.5 <517 <194 <110.5 <590 <155.5 <426 <384 - <180 730.6 4,650 19,200 482.3 <410 <410 <490 <590 <176 -- 11/15/2004 1,772.0 µg/m³ - <500 - <1,000 <5,000 - - - <500 - - - - - - - - - - - - -- 12/8/2004 1,772.0 µg/m³ - <500 - <1,000 <5,000 - - - <500 - - - - - - - - - - - - -- Comments Ambient GW-08 GW-13 GW-19 GW-22 GW-25 GW-29 MW-02 NDP-01-D NDP-01-S NDP-02-D Tuesday, November 13, 2012 Page 1 of 5 Appendix I. Soil Vapor Analytical Results - Summary of Freon and Other VOC Data Sample Date Sample Elevation (ft amsl) Units Acetone Bromodichloromethane Bromoethene(Vinyl Bromide) Bromoform Bromomethane 1,3-Butadiene 2-Butanone (MEK) Carbon disulfide Dibromochloromethane 1,2-Dibromoethane (EDB) Ethanol Ethyl Acetate Freon 11 Freon 12 Freon 113 Freon 114 2-Hexanone 4-Methyl-2-pentanone (MIK) 2-Propanol (IPA) Tetrahydrofuran Vinyl acetate Well Name Cave Creek Landfill, Maricopa County 6/9/2005 1,772.0 µg/m³ - <500 - <1,000 <5,000 - - - <500 - - - - - - - - - - - - -- 6/10/2005 1,772.0 µg/m³ - - - - - - - - - - - - - - - - - - - - - -- 1/17/2008 1,772.0 µg/m³ - - - - - - - - - - - - - - - - - - - - - -- 12/1/2009 1,772.0 µg/m³ <1,100 <790 - <1,200 <460 <260 <350 <360 <1,000 <900 <880 - 2,900 9,000 170,000 <820 <1,900 <480 <1,200 <350 - -- 11/15/2004 1,822.0 µg/m³ - <500 - <1,000 <5,000 - - - <500 - - - - - - - - - - - - -- 12/8/2004 1,822.0 µg/m³ - <500 - <1,000 <5,000 - - - <500 - - - - - - - - - - - - -- 6/9/2005 1,822.0 µg/m³ - <500 - <1,000 <5,000 - - - <500 - - - - - - - - - - - - -- 6/10/2005 1,822.0 µg/m³ - - - - - - - - - - - - - - - - - - - - - -- 1/17/2008 1,822.0 µg/m³ - - - - - - - - - - - - - - - - - - - - - -- 12/1/2009 1,822.0 µg/m³ 3,400 <540 - <830 <310 <180 <240 <250 <680 <620 <610 - 2,000 6,900 120,000 <560 <1,300 <330 <790 <240 - -- 11/18/2004 1,773.0 µg/m³ - <500 - <1,000 <5,000 - - - <500 - - - - - - - - - - - - -- 12/8/2004 1,773.0 µg/m³ - <500 - <1,000 <5,000 - - - <500 - - - - - - - - - - - - -- 12/1/2009 1,773.0 µg/m³ <1,500 <1,000 - <1,600 <600 <340 <450 <480 <1,300 <1,200 <1,200 - 2,100 32,000 120,000 1,800 <2,500 <630 <1,500 <450 - -- 11/18/2004 1,823.0 µg/m³ - <500 - <1,000 <5,000 - - - <500 - - - - - - - - - - - - -- 12/8/2004 1,823.0 µg/m³ - <500 - <1,000 <5,000 - - - <500 - - - - - - - - - - - - -- 12/1/2009 1,823.0 µg/m³ <400 <280 - <430 <160 <92 <120 <130 <350 <320 <310 - 310 8,800 9,600 2,200 <680 <170 <410 190 - -- 11/18/2004 1,767.0 µg/m³ - <500 - <1,000 <5,000 - - - <500 - - - - - - - - - - - - -- 12/8/2004 1,767.0 µg/m³ - <500 - <1,000 <5,000 - - - <500 - - - - - - - - - - - - -- 12/1/2009 1,767.0 µg/m³ <45 <31 - <48 <18 <10 <14 <15 <40 <36 <35 - 620 720 1,300 360 <77 <19 <46 23 - -- 11/18/2004 1,817.0 µg/m³ - <500 - <1,000 <5,000 - - - <500 - - - - - - - - - - - - -- 12/8/2004 1,817.0 µg/m³ - <500 - <1,000 <5,000 - - - <500 - - - - - - - - - - - - -- 12/1/2009 1,817.0 µg/m³ <30 <21 - <33 <12 <7 <9.3 <9.8 <27 <24 <24 - 560 420 290 200 <52 <13 <31 94 - -- 11/18/2004 1,762.0 µg/m³ - <500 - <1,000 <5,000 - - - <500 - - - - - - - - - - - - -- 12/8/2004 1,762.0 µg/m³ - <500 - <1,000 <5,000 - - - <500 - - - - - - - - - - - - -- 1/17/2008 1,762.0 µg/m³ - - - - - - - - - - - - - - - - - - - - - -- 12/1/2009 1,762.0 µg/m³ <33 <23 - <36 <13 <7.6 <10 <11 <29 <26 <26 - 320 540 2,500 360 <57 <14 <34 23 - -- 11/8/2011 1,762.0 µg/m³ <595 <167.5 <109.3 <258.5 <97 <55.3 <295 <77.8 <213 <192 - <90 207.9 440.6 1,380 258.6 <205 <205 <245 <295 <88 -- 11/18/2004 1,812.0 µg/m³ - <500 - <1,000 <5,000 - - - <500 - - - - - - - - - - - - -- 12/8/2004 1,812.0 µg/m³ - <500 - <1,000 <5,000 - - - <500 - - - - - - - - - - - - -- Comments NDP-02-D NDP-02-S ODP-01-D ODP-01-S ODP-02-D ODP-02-S ODP-03-D ODP-03-S Tuesday, November 13, 2012 Page 2 of 5 Appendix I. Soil Vapor Analytical Results - Summary of Freon and Other VOC Data Sample Date Sample Elevation (ft amsl) Units Acetone Bromodichloromethane Bromoethene(Vinyl Bromide) Bromoform Bromomethane 1,3-Butadiene 2-Butanone (MEK) Carbon disulfide Dibromochloromethane 1,2-Dibromoethane (EDB) Ethanol Ethyl Acetate Freon 11 Freon 12 Freon 113 Freon 114 2-Hexanone 4-Methyl-2-pentanone (MIK) 2-Propanol (IPA) Tetrahydrofuran Vinyl acetate Well Name Cave Creek Landfill, Maricopa County 1/17/2008 1,812.0 µg/m³ - - - - - - - - - - - - - - - - - - - - - -- 12/1/2009 1,812.0 µg/m³ 33 <10 - <16 <6.1 <3.5 8.8 <4.9 <13 <12 18 - 160 980 240 240 <26 <6.5 <16 31 - -- 11/8/2011 1,812.0 µg/m³ <59.5 <16.8 <10.9 <25.9 <9.7 <5.5 <29.5 <7.8 <21.3 <19.2 - <9 168.6 207.9 <19.2 517.3 <20.5 <20.5 <24.5 <29.5 <8.8 -- 11/18/2004 1,767.0 µg/m³ - <500 - <1,000 <5,000 - - - <500 - - - - - - - - - - - - -- 12/8/2004 1,767.0 µg/m³ - <500 - <1,000 <5,000 - - - <500 - - - - - - - - - - - - -- 1/17/2008 1,767.0 µg/m³ - - - - - - - - - - - - - - - - - - - - - -- 12/1/2009 1,767.0 µg/m³ <160 <120 - <180 <68 <38 <51 <54 <150 <130 <130 - 180 2,700 13,000 1,200 <280 <71 <170 <51 - -- 11/18/2004 1,817.0 µg/m³ - <500 - <1,000 <5,000 - - - <500 - - - - - - - - - - - - -- 12/8/2004 1,817.0 µg/m³ - <500 - <1,000 <5,000 - - - <500 - - - - - - - - - - - - -- 1/17/2008 1,817.0 µg/m³ - - - - - - - - - - - - - - - - - - - - - -- 12/1/2009 1,817.0 µg/m³ 69 <22 - <34 <13 <7.4 22 <10 <28 <26 <25 - 46 570 540 500 <55 <14 <33 58 - -- 11/16/2004 - µg/m³ - <500 - <1,000 <5,000 - - - <500 - - - - - - - - - - - - -- 12/2/2009 - µg/m³ 420 <16 - <26 <9.6 <5.5 390 <7.7 <21 <19 19 - 220 430 670 32 <40 <10 69 1,100 - -- 11/16/2004 - µg/m³ - <500 - <1,000 <5,000 - - - <500 - - - - - - - - - - - - -- 12/2/2009 - µg/m³ 120 <8 - <12 <4.6 <2.6 120 4.7 <10 <9.1 <9 - 31 190 180 21 <19 <4.9 16 350 - -- 11/8/2011 - µg/m³ 30.9 <6.7 <4.4 <10.3 <3.9 <2.2 <11.8 <3.1 <8.5 <7.7 - <3.6 <5.6 <9.9 <7.7 <7 <8.2 <8.2 <9.8 <11.8 <3.5 -- 3/9/2012 - µg/m³ 16.7 <3.4 <2.2 <5.2 <1.9 <1.1 24.2 <1.6 <4.3 <3.8 - <1.8 <2.8 7.4 <3.8 <3.5 <8.2 <8.2 <4.9 <5.9 <1.8 -- 11/18/2004 - µg/m³ - <500 - <1,000 <5,000 - - - <500 - - - - - - - - - - - - -- 11/16/2004 - µg/m³ - <500 - <1,000 <5,000 - - - <500 - - - - - - - - - - - - -- 1/5/2012 - µg/m³ <11.9 <3.4 <2.2 <5.2 <1.9 <1.1 <5.9 <1.6 <4.3 <3.8 - <1.8 <2.8 5.9 <3.8 <3.5 <4.1 <8.2 <4.9 <5.9 <1.8 -- 11/16/2004 - µg/m³ - <500 - <1,000 <5,000 - - - <500 - - - - - - - - - - - - -- 1/5/2012 - µg/m³ <11.9 <3.4 <2.2 <5.2 <1.9 <1.1 41.3 <1.6 <4.3 <3.8 - <1.8 5.1 15.3 229.8 <3.5 <4.1 <8.2 <4.9 <5.9 <1.8 -- 11/16/2004 - µg/m³ - <500 - <1,000 <5,000 - - - <500 - - - - - - - - - - - - -- 1/5/2012 - µg/m³ 61.9 <3.4 <2.2 <5.2 <1.9 <1.1 27.4 <1.6 <4.3 <3.8 - <1.8 <2.8 <5 <3.8 <3.5 <4.1 <8.2 <4.9 <5.9 <1.8 -- 3/9/2012 - µg/m³ <2,380 <670 <437 <1,030 <388 <221 <1,180 <311 <852 <768 - <360 <562 <990 15,300 <699 <1,640 <1,640 <980 <1,180 <352 -- Comments ODP-03-S ODP-04-D ODP-04-S P-02-D P-02-S P-03 P-05 P-06 P-07 P-08 P-09 Tuesday, November 13, 2012 Page 3 of 5 Appendix I. Soil Vapor Analytical Results - Summary of Freon and Other VOC Data Sample Date Sample Elevation (ft amsl) Units Acetone Bromodichloromethane Bromoethene(Vinyl Bromide) Bromoform Bromomethane 1,3-Butadiene 2-Butanone (MEK) Carbon disulfide Dibromochloromethane 1,2-Dibromoethane (EDB) Ethanol Ethyl Acetate Freon 11 Freon 12 Freon 113 Freon 114 2-Hexanone 4-Methyl-2-pentanone (MIK) 2-Propanol (IPA) Tetrahydrofuran Vinyl acetate Well Name Cave Creek Landfill, Maricopa County 11/16/2004 - µg/m³ - <500 - <1,000 <5,000 - - - <500 - - - - - - - - - - - - -- 1/5/2012 - µg/m³ 16.2 <3.4 <2.2 <5.2 <1.9 <1.1 62 <1.6 <4.3 <3.8 - <1.8 <2.8 5.9 71.2 <3.5 <4.1 <8.2 <4.9 <5.9 <1.8 Duplicate Sample 1/5/2012 - µg/m³ 23.3 <3.4 <2.2 <5.2 <1.9 <1.1 76.7 <1.6 <4.3 <3.8 - <1.8 <2.8 7.9 130.2 <3.5 <4.1 <8.2 <4.9 <5.9 <1.8 -- 11/16/2004 - µg/m³ - <500 - <1,000 <5,000 - - - <500 - - - - - - - - - - - - -- 11/16/2004 - µg/m³ - <500 - <1,000 <5,000 - - - <500 - - - - - - - - - - - - -- 11/16/2004 - µg/m³ - <500 - <1,000 <5,000 - - - <500 - - - - - - - - - - - - -- 11/16/2004 - µg/m³ - <500 - <1,000 <5,000 - - - <500 - - - - - - - - - - - - -- 11/16/2004 - µg/m³ - <500 - <1,000 <5,000 - - - <500 - - - - - - - - - - - - -- 11/16/2004 - µg/m³ - <500 - <1,000 <5,000 - - - <500 - - - - - - - - - - - - -- 11/15/2004 - µg/m³ - <500 - <1,000 <5,000 - - - <500 - - - - - - - - - - - - -- 12/2/2009 - µg/m³ 1,700 <16 - <24 <9 <5.2 590 <7.2 <20 <18 <18 - 3,000 4,500 1,300 270 <38 <9.5 110 2,000 - -- 11/15/2004 - µg/m³ - <500 - <1,000 <5,000 - - - 5,100 - - - - - - - - - - - - -- 12/2/2009 - µg/m³ 530 <32 - <50 <19 <11 470 <15 <41 <37 <36 - 3,800 5,600 600 340 <79 <20 72 1,500 - -- 11/15/2004 - µg/m³ - <500 - <1,000 <5,000 - - - <500 - - - - - - - - - - - - -- 11/15/2004 - µg/m³ - <500 - <1,000 <5,000 - - - <500 - - - - - - - - - - - - -- 11/16/2004 - µg/m³ - <500 - <1,000 <5,000 - - - <500 - - - - - - - - - - - - -- 11/16/2004 - µg/m³ - <500 - <1,000 <5,000 - - - <500 - - - - - - - - - - - - -- 11/15/2004 - µg/m³ - <500 - <1,000 <5,000 - - - <500 - - - - - - - - - - - - -- 5/21/2009 1,201.4 µg/m³ <1,200 <830 - <1,300 <480 <270 <360 <380 <1,000 <950 <930 - <690 1,800 45,000 <860 <2,000 <500 <1,200 <360 - -- 6/16/2010 1,201.4 µg/m³ <6,200 <620 - <620 <620 <620 <6,200 <6,200 <620 <620 <6,200 <1,200 <620 770 - - <620 <620 <1,200 <620 <6,200 One Day Preliminary SVE Test 6/16/2010 1,201.4 µg/m³ <8,500 <850 - <850 <850 <850 <8,500 <8,500 <850 <850 <8,500 <1,700 <850 1,000 - - <850 <850 <1,700 <850 <8,500 One Day Preliminary SVE Test 6/16/2010 1,201.4 µg/m³ <6,300 <630 - <630 <630 <630 <6,300 <6,300 <630 <630 <6,300 <1,300 <630 930 - - <630 <630 <1,300 <630 <6,300 One Day Preliminary SVE Test Comments P-10 P-11 P-12 P-13-D P-13-S P-17-D P-17-S P-18-D P-18-S P-19-D P-19-S P-22 P-23 P-25 PW Tuesday, November 13, 2012 Page 4 of 5 Appendix I. Soil Vapor Analytical Results - Summary of Freon and Other VOC Data Sample Date Sample Elevation (ft amsl) Units Acetone Bromodichloromethane Bromoethene(Vinyl Bromide) Bromoform Bromomethane 1,3-Butadiene 2-Butanone (MEK) Carbon disulfide Dibromochloromethane 1,2-Dibromoethane (EDB) Ethanol Ethyl Acetate Freon 11 Freon 12 Freon 113 Freon 114 2-Hexanone 4-Methyl-2-pentanone (MIK) 2-Propanol (IPA) Tetrahydrofuran Vinyl acetate Well Name Cave Creek Landfill, Maricopa County 11/8/2011 1,201.4 µg/m³ <11,900 <3,350 <2,190 <5,170 <1,940 <1,110 <5,900 <1,560 <4,260 <3,840 - <1,800 <2,810 <4,950 72,000 <3,500 <4,100 <4,100 <4,900 <5,900 <1,760 -- 11/23/2011 1,201.4 µg/m³ <11,900 <3,350 <2,190 <5,170 <1,940 <1,110 <5,900 <1,560 <4,260 <3,840 - <1,800 <2,810 <4,950 107,000 <3,500 <4,100 <4,100 <4,900 <5,900 <1,760 Extended SVE Pilot Test 2/23/2010 1,332.0 µg/m³ <1,200 <830 - <1,300 <480 <270 <360 <390 <1,000 <950 <930 - <700 730 12,000 <870 <2,000 <510 <1,200 <360 - -- 6/16/2010 1,332.0 µg/m³ 20,000 <220 - <220 <220 <220 31,000 <2,200 <220 <220 <2,200 <440 <220 <220 - - <220 <220 <440 96,000 <2,200 One Day Preliminary SVE Test 6/16/2010 1,332.0 µg/m³ <12,000 <1,200 - <1,200 <1,200 <1,200 <12,000 <12,000 <1,200 <1,200 <12,000 <2,300 <1,200 <1,200 - - <1,200 <1,200 <2,300 4,700 <12,000 One Day Preliminary SVE Test 6/16/2010 1,332.0 µg/m³ <17,000 <1,700 - <1,700 <1,700 <1,700 <17,000 <17,000 <1,700 <1,700 <17,000 <3,500 <1,700 <1,700 - - <1,700 <1,700 <3,500 1,900 <17,000 One Day Preliminary SVE Test 6/16/2010 1,332.0 µg/m³ <15,000 <1,500 - <1,500 <1,500 <1,500 <15,000 <15,000 <1,500 <1,500 <15,000 <3,100 <1,500 <1,500 - - <1,500 <1,500 <3,100 <1,500 <15,000 One Day Preliminary SVE Test 11/8/2011 1,332.0 µg/m³ <11,900 <3,350 <2,190 <5,170 <1,940 <1,110 <5,900 <1,560 <4,260 <3,840 - <1,800 <2,810 <4,950 5,360 <3,500 <4,100 <4,100 <4,900 <5,900 <1,760 -- 2/20/2012 1,332.0 µg/m³ <11,900 <3,350 <2,190 <5,170 <1,940 <1,110 <5,900 <1,560 <4,260 <3,840 - <1,800 <2,810 <4,950 41,400 <3,500 <4,100 <4,100 <4,900 <5,900 <1,760 Extended SVE Pilot Test 2/29/2012 1,332.0 µg/m³ <119,000 <33,500 <21,900 <51,700 <19,400 <11,100 <59,000 <15,600 <42,600 <38,400 - <18,000 <28,100 <49,500 245,000 <35,000 <82,000 <82,000 <49,000 <59,000 <17,600 Extended SVE Pilot Test 2/23/2010 1,531.0 µg/m³ <650 <460 - <700 <260 <150 <200 <210 <580 <520 <510 - 760 2,800 100,000 <480 <1,100 <280 <670 <200 - -- 6/16/2010 1,531.0 µg/m³ 8,600 <620 - <620 <620 <620 14,000 <6,200 <620 <620 <6,200 <1,200 <620 1,000 - - <620 <620 <1,200 38,000 <6,200 One Day Preliminary SVE Test 6/16/2010 1,531.0 µg/m³ <5,800 <580 - <580 <580 <580 <5,800 <5,800 <580 <580 <5,800 <1,200 <580 1,200 - - <580 <580 <1,200 4,800 <5,800 One Day Preliminary SVE Test 6/16/2010 1,531.0 µg/m³ <9,400 <940 - <940 <940 <940 <9,400 <9,400 <940 <940 <9,400 <1,900 <940 1,600 - - <940 <940 <1,900 1,600 <9,400 One Day Preliminary SVE Test 6/16/2010 1,531.0 µg/m³ <9,300 <930 - <930 <930 <930 <9,300 <9,300 <930 <930 <9,300 <1,900 <930 1,300 - - <930 <930 <1,900 <930 <9,300 One Day Preliminary SVE Test 11/8/2011 1,531.0 µg/m³ <23,800 <6,700 <4,370 <10,300 <3,880 <2,210 <11,800 <3,110 <8,520 <7,680 - <3,600 <5,620 <9,900 123,000 <6,990 <8,200 <8,200 <9,800 <11,800 <3,520 -- 1/16/2012 1,531.0 µg/m³ <47,600 <13,400 <8,740 <20,700 <7,760 <4,420 <23,600 <6,220 <17,000 <15,400 - <7,200 <11,200 <19,800 153,000 <14,000 <16,400 <16,400 <19,600 <23,600 <7,040 Extended SVE Pilot Test 1/20/2012 1,531.0 µg/m³ <47,600 <13,400 <8,740 <20,700 <7,760 <4,420 <23,600 <6,220 <17,000 <15,400 - <7,200 <11,200 <19,800 169,000 <14,000 <16,400 <16,400 <19,600 <23,600 <7,040 Extended SVE Pilot Test 1/31/2012 1,531.0 µg/m³ <47,600 <13,400 <8,740 <20,700 <7,760 <4,420 <23,600 <6,220 <17,000 <15,400 - <7,200 <11,200 23,300 199,000 <14,000 <16,400 <16,400 <19,600 <23,600 <7,040 Extended SVE Pilot Test 2/20/2012 1,531.0 µg/m³ <23,800 <6,700 <4,370 <10,300 <3,880 <2,210 <11,800 <3,110 <8,520 <7,680 - <3,600 <5,620 <9,900 161,000 <6,990 <8,200 <8,200 <9,800 <11,800 <3,520 Extended SVE Pilot Test 2/23/2010 1,731.0 µg/m³ <300 <210 - <320 <120 <70 <93 <98 <270 <240 <240 - 790 3,100 140,000 <220 <520 <130 <310 <93 - -- 6/16/2010 1,731.0 µg/m³ 11,000 <270 - <270 <270 <270 17,000 <2,700 <270 <270 <2,700 <530 <270 350 - - <270 <270 <530 44,000 <2,700 One Day Preliminary SVE Test 6/16/2010 1,731.0 µg/m³ <10,000 <1,000 - <1,000 <1,000 <1,000 <10,000 <10,000 <1,000 <1,000 <10,000 <2,000 <1,000 1,800 - - <1,000 <1,000 <2,000 2,200 <10,000 One Day Preliminary SVE Test 6/16/2010 1,731.0 µg/m³ <7,400 <740 - <740 <740 <740 <7,400 <7,400 <740 <740 <7,400 <1,500 <740 1,600 - - <740 <740 <1,500 <740 <7,400 One Day Preliminary SVE Test 6/16/2010 1,731.0 µg/m³ <12,000 <1,200 - <1,200 <1,200 <1,200 <12,000 <12,000 <1,200 <1,200 <12,000 <2,300 <1,200 2,500 - - <1,200 <1,200 <2,300 <1,200 <12,000 One Day Preliminary SVE Test 11/8/2011 1,731.0 µg/m³ <23,800 <6,700 <4,370 <10,300 <3,880 <2,210 <11,800 <3,110 <8,520 <7,680 - <3,600 <5,620 <9,900 337,000 <6,990 <8,200 <8,200 <9,800 <11,800 <3,520 -- 11/16/2011 1,731.0 µg/m³ <23,800 <6,700 <4,370 <10,300 <3,880 <2,210 <11,800 <3,110 <8,520 <7,680 - <3,600 <5,620 <9,900 391,000 <6,990 <8,200 <8,200 <9,800 <11,800 <3,520 Extended SVE Pilot Test 11/23/2011 1,731.0 µg/m³ <23,800 <6,700 <4,370 <10,300 <3,880 <2,210 <11,800 <3,110 <8,520 <7,680 - <3,600 <5,620 <9,900 360,000 <6,990 <8,200 <8,200 <9,800 <11,800 <3,520 Extended SVE Pilot Test 12/13/2011 1,731.0 µg/m³ <47,600 <13,400 <8,740 <20,700 <7,760 <4,420 <23,600 <6,220 <17,000 <15,400 - <7,200 <11,200 <19,800 421,000 <14,000 <16,400 <16,400 <19,600 <23,600 <7,040 Extended SVE Pilot Test Comments PW TSSV-01-D TSSV-01-M TSSV-01-S Notes: Grey text indicates a non-detected compound µg/m³ - micrograms per cubic meter ft amsl - feet above mean sea level - = data not applicable or available Tuesday, November 13, 2012 Page 5 of 5 APPENDIX J ONE-DAY SVE PILOT TEST OPERATIONAL AND ROI DATA Appendix J. One-Day SVE Pilot Test Operational and ROI Data Cave Creek Landfill, Maricopa County SVE System/Extraction Well(s): P-13 P-13X S P-13X D ODP-3 S ODP-3 D TSSV1-S TSSV1-L TSSV1-D Maximum TSSV1(1) vacuum and flow rates P-10 Approx. Approx. Approx. Approx. Vac Vac Vac Flow Flow Flow Flow ("H2O) ("H2O) Rate ("H2O) Rate Rate Rate (acfm) (acfm) (acfm) (acfm) P-25 Vac ("H2O) Monitoring Point Wells Vacuum ("H 2O) TSSV1-D 42 156 56 62 56 55 N/A N/A N/A N/A N/A N/A N/A N/A N/A N/A N/A 6/16/10 11:00 TSSV1‐S,L,D(1) Y ‐‐‐ 30 174 N/A 117 N/A 55 N/A 0 ‐‐‐ ‐‐‐ ‐‐‐ ‐‐‐ ‐‐‐ ‐‐‐ ‐‐‐ ‐‐‐ ‐‐‐ ‐‐‐ ‐‐‐ 6/16/10 11:20 TSSV1‐S,L,D(1) N ‐‐‐ 30 172 N/A 117 N/A 55 N/A 0 ‐‐‐ ‐‐‐ ‐‐‐ ‐‐‐ ‐‐‐ ‐‐‐ ‐‐‐ ‐‐‐ ‐‐‐ ‐‐‐ ‐‐‐ 6/16/10 11:22 TSSV1‐S,L,D(1) N ‐‐‐ 10 115 N/A 68 N/A 48 N/A 0 ‐‐‐ 0.00 0.00 0.00 0.00 0.00 0.00 0.00 N/A N/A N/A 6/16/10 11:50 TSSV1‐S,L,D(1) N ‐‐‐ 10 75 N/A 55 N/A 20 N/A 0 ‐‐‐ <0.00 0.00 0.00 0.01 0.03 <0.00 0.07 N/A N/A N/A 6/16/10 12:20 TSSV1‐S,L,D(1) N ‐‐‐ 10 75 N/A 55 N/A 20 N/A 0 ‐‐‐ <0.00 0.00 0.00 <0.00 <0.00 <0.00 <0.00 N/A N/A N/A 6/16/10 12:50 (1) TSSV1‐S,L,D Y 115.5 133.4 185.0 10 75 N/A 55 N/A 20 N/A 0 ‐‐‐ <0.00 0.00 0.00 <0.00 <0.00 <0.00 <0.00 N/A N/A N/A 6/16/10 13:20 TSSV1‐S,L,D(1) N ‐‐‐ 20 115 N/A 92 N/A 23 N/A 0 ‐‐‐ 0.00 0.00 0.00 0.00 0.00 N/A N/A N/A 6/16/10 13:50 TSSV1‐S,L,D(1) N ‐‐‐ 20 115 N/A 92 N/A 23 N/A 0 ‐‐‐ <0.00 0.00 <0.00 <0.00 <0.00 <0.00 <0.00 N/A N/A N/A 6/16/10 14:20 (1) TSSV1‐S,L,D Y 114.5 125.4 152.9 20 115 N/A 92 N/A 23 N/A 0 ‐‐‐ <0.00 <0.00 <0.00 <0.00 <0.00 <0.00 <0.00 N/A N/A N/A 6/16/10 14:50 TSSV1‐S,L,D(1) N ‐‐‐ 20 115 N/A 92 N/A 23 N/A 0 0.40 <0.00 <0.00 <0.00 <0.00 <0.00 <0.00 <0.00 N/A N/A N/A 6/16/10 15:20 TSSV1‐S,L,D(1) N ‐‐‐ 30 179 N/A 120 N/A 39 N/A 20 6/16/10 15:30 TSSV1‐S,L,D(1) N ‐‐‐ 30 180 N/A 120 N/A 39 N/A 6/16/10 16:00 TSSV1‐S,L,D(1) N 121.4 124.7 139.4 30 180 N/A 120 N/A 39 6/16/10 16:30 TSSV1‐S,L,D(1) N ‐‐‐ 32 180 N/A 120 N/A Max Vac 6/16/10 17:30 PW N ‐‐‐ 26 187 N/A N/A 2/3 1/3 Max Vac Vacuum 6/16/10 20:00 Well I.D. PID ppm TSSV1-L PW Date & Time Sample Y/N TSSV1-S 6/16/10 18:00 PW Y 54 8.6 62 N/A 6/16/10 18:30 PW N ‐‐‐ 8.6 62 6/16/10 19:00 PW Y 81 17 6/16/10 19:30 PW N ‐‐‐ 6/16/10 20:00 PW Y 6/16/10 20:30 PW N Max Vacuum 3/3 Max Vacuum 2/3 Max Vacuum 1/3 Max Vacuum Max Vac ‐‐‐ 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 N/A N/A N/A 20 0.50 <0.00 0.00 <0.00 <0.00 <0.00 <0.00 <0.00 N/A N/A N/A N/A 20 0.57 <0.00 0.00 <0.00 <0.00 <0.00 <0.00 <0.00 N/A N/A N/A 43 N/A 20 0.60 <0.00 0.00 <0.00 <0.00 <0.00 <0.00 <0.00 <0.00 <0.00 <0.00 N/A N/A N/A N/A ‐‐‐ ‐‐‐ ‐‐‐ ‐‐‐ ‐‐‐ ‐‐‐ ‐‐‐ ‐‐‐ ‐‐‐ ‐‐‐ ‐‐‐ N/A N/A N/A N/A N/A N/A 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.25 0.25 0.10 N/A N/A N/A N/A N/A N/A N/A <0.00 0.00 0.00 0.00 0.00 <0.00 <0.00 0.20 0.20 0.10 123 N/A N/A N/A N/A N/A N/A N/A <0.00 0.00 0.00 <0.00 <0.00 <0.00 <0.00 0.05 0.06 0.00 26 190 N/A N/A N/A N/A N/A N/A N/A <0.00 0.00 0.00 <0.00 <0.00 <0.00 <0.00 0.05 0.06 0.00 94 26 190 N/A N/A N/A N/A N/A N/A N/A <0.00 0.00 0.00 <0.00 <0.00 <0.00 <0.00 0.05 0.08 0.00 ‐‐‐ 26 190 N/A N/A N/A N/A N/A N/A N/A <0.00 0.00 0.00 <0.00 <0.00 <0.00 <0.00 0.05 0.07 0.00 Notes: (1) ‐ TSSV1 nested wells S, L and D manifolded into single conveyance line. "‐‐‐" ‐ No reading 11/19/2012 acfm ‐ " H 2O ‐ I.D. ‐ Max ‐ Actual cubic feet per minute Inches of water column Identification Maximum N/A ‐ PID ‐ SVE ‐ Vac ‐ Not applicable Photoionization detector Soil vapor extraction Vacuum Page 1 of 1 APPENDIX K EXTENDED SVE PILOT TEST OPERATIONAL AND ROI DATA Cave Creek Landfill, Maricopa County Appendix K. Extended SVE Pilot Test Operational Data PW Well Monitoring Wellhead Wellhead Flow Rate Vacuum [scfm] [in-H2O] ‐‐ 80 Wellhead Wellhead Wellhead Wellhead Wellhead O2 H2 S CH4 PID CO Reading Reading Reading Reading Reading Comments [%] [% LEL] [%] [ppmV] [%] Startup w/SVE from PW and TSSV‐1‐S 58.0 ‐‐ ‐‐ ‐‐ ‐‐ Date [MM/DD/YY] 11/16/2011 Operator [Initials] LH Time [24-h] 14:00 11/17/2011 11/18/2011 11/21/2011 11/23/2011 11/28/2011 LH LH/RK RK RK LH 6:30 9:20 9:30 9:30 8:00 ‐‐ ‐‐ ‐‐ 230 ‐‐ 85 85 ‐‐ ‐‐ ‐‐ 37.0 117.0 130.0 142.0 122.6 ‐‐ ‐‐ ‐‐ ‐‐ ‐‐ ‐‐ 7 ‐‐ ‐‐ ‐‐ ‐‐ ‐‐ ‐‐ ‐‐ ‐‐ ‐‐ 5.9 ‐‐ ‐‐ ‐‐ 11/28/2011 LH 8:00 220 65 176.8 8.8 4 ‐‐ 8.2 12/1/2011 12/5/2011 ‐‐ LH ‐‐ 8:30 ‐‐ 205 ‐‐ 65 ‐‐ 82.6 ‐‐ 0.1 ‐‐ 1 ‐‐ ‐‐ ‐‐ 9.6 12/6/2011 LH 8:00 ‐‐ ‐‐ ‐‐ ‐‐ ‐‐ ‐‐ ‐‐ ‐‐‐ ‐‐‐ ‐‐‐ Sampled at 10:00 Rented PID (previous measurements are w/this PID) County PID (subsequent measurements are w/ this PID); shutdown after monitoring Carbon changeout Restart w/ SVE from PW and TSSV‐1‐S; closed PW to SVE after monitoring Closed to SVE 12/8/2011 12/9/2011 LH LH 8:00 7:30 ‐‐ ‐‐ ‐‐ ‐‐ ‐‐ ‐‐ ‐‐ ‐‐ ‐‐ ‐‐ ‐‐ ‐‐ ‐‐ ‐‐ Closed to SVE Closed to SVE 12/12/2011 LH 13:00 ‐‐ ‐‐ ‐‐ ‐‐ ‐‐ ‐‐ ‐‐ Closed to SVE 12/13/2011 12/15/2011 12/15/2011 12/15/2011 LH SW LH LH 9:00 8:30 12:30 14:55 0 ‐‐ 0 0 0.09P ‐‐ 0.15 0.15 ‐‐ ‐‐ ‐‐ ‐‐ ‐‐ ‐‐ ‐‐ ‐‐ ‐‐ ‐‐ ‐‐ ‐‐ ‐‐ ‐‐ ‐‐ ‐‐ ‐‐ ‐‐ ‐‐ ‐‐ Closed to SVE Closed to SVE Closed to SVE Closed to SVE 1/16/2012 LH/RK 16:00 ‐‐ ‐‐ ‐‐ ‐‐ ‐‐ ‐‐ ‐‐ Closed to SVE 1/17/2012 RK 12:00 ‐‐ ‐‐ ‐‐ ‐‐ ‐‐ ‐‐ ‐‐ Closed to SVE 1/17/2012 RK 14:00 ‐‐ ‐‐ ‐‐ ‐‐ ‐‐ ‐‐ ‐‐ Closed to SVE 1/18/2012 RK 11:00 ‐‐ ‐‐ ‐‐ ‐‐ ‐‐ ‐‐ ‐‐ Closed to SVE 1/19/2012 1/20/2012 SW LH 9:00 8:00 ‐‐ ‐‐ ‐‐ ‐‐ ‐‐ ‐‐ ‐‐ ‐‐ ‐‐ ‐‐ ‐‐ ‐‐ ‐‐ ‐‐ Closed to SVE Closed to SVE 1/20/2012 LH/RK 12:00 ‐‐ ‐‐ ‐‐ ‐‐ ‐‐ ‐‐ ‐‐ Closed to SVE 1/20/2012 LH/RK 13:45 ‐‐ ‐‐ ‐‐ ‐‐ ‐‐ ‐‐ ‐‐ Closed to SVE 1/21/2012 1/22/2012 1/23/2012 1/24/2012 SW SW SW LH 9:00 10:00 8:14 12:30 ‐‐ ‐‐ ‐‐ ‐‐ ‐‐ ‐‐ ‐‐ ‐‐ ‐‐ ‐‐ ‐‐ ‐‐ ‐‐ ‐‐ ‐‐ ‐‐ ‐‐ ‐‐ ‐‐ ‐‐ ‐‐ ‐‐ ‐‐ ‐‐ ‐‐ ‐‐ ‐‐ ‐‐ Closed to SVE Closed to SVE Closed to SVE Closed to SVE 1/26/2012 SW 8:13 ‐‐ ‐‐ ‐‐ ‐‐ ‐‐ ‐‐ ‐‐ Closed to SVE 1/27/2012 LH 15:30 ‐‐ ‐‐ ‐‐ ‐‐ ‐‐ ‐‐ ‐‐ Closed to SVE 1/30/2012 1/31/2012 RK LH 12:01 12:00 ‐‐ ‐‐ ‐‐ ‐‐ ‐‐ ‐‐ ‐‐ ‐‐ ‐‐ ‐‐ ‐‐ ‐‐ ‐‐ ‐‐ Closed to SVE Closed to SVE 2/3/2012 2/7/2012 LH LH 9:00 10:00 ‐‐ ‐‐ ‐‐ ‐‐ ‐‐ ‐‐ ‐‐ ‐‐ ‐‐ ‐‐ ‐‐ ‐‐ ‐‐ ‐‐ Closed to SVE Closed to SVE 2/16/2012 2/20/2012 RK RK/LH 11:50 11:15 ‐‐ ‐‐ ‐‐ ‐‐ ‐‐ ‐‐ ‐‐ ‐‐ ‐‐ ‐‐ ‐‐ ‐‐ ‐‐ ‐‐ Closed to SVE Vacuum at PW when TSSV‐1‐S, ‐M, and ‐D operated at 100 in‐H2O ranged from 1.30 to 1.49 in‐H2O 2/20/2012 RK/LH 13:20 ‐‐ ‐‐ ‐‐ ‐‐ ‐‐ ‐‐ ‐‐ Closed to SVE 2/21/2012 2/29/2012 RK RK 14:30 11:00 ‐‐ ‐‐ ‐‐ ‐‐ ‐‐ ‐‐ ‐‐ ‐‐ ‐‐ ‐‐ ‐‐ ‐‐ ‐‐ ‐‐ Closed to SVE Vacuum at PW when TSSV‐1‐D operated at 100 in‐H2O was 1.24 in‐H2O Notes: Blue text identifies anomolous data 11/19/2012 Page 1 of 6 Prepared by: RK Checked by: NCL Cave Creek Landfill, Maricopa County Appendix K. Extended SVE Pilot Test Operational Data TSSV Well Monitoring Operating Screened Wellhead Wellhead Time Interval Flow Rate Vacuum [24-h] [ft bgs] [ft3 / min] [in-H2O] 14:00 150‐200 ‐‐ 80 Wellhead PID Reading [ppmV] 139.0 Wellhead Wellhead Wellhead H2 S CH4 CO Reading Reading [% Reading [%] LEL] [%] 4.7 0 ‐‐ Wellhead O2 Reading Comments [%] Startup w/SVE from PW and TSSV‐1‐ 10.5 Date [MM/DD/YY] 11/16/2011 Operator [Initials] LH 11/17/2011 11/18/2011 11/21/2011 11/23/2011 11/28/2011 LH LH/RK RK RK LH 6:30 8:53 9:30 9:30 8:00 150‐200 150‐200 150‐200 150‐200 150‐200 ‐‐ ‐‐ ‐‐ ‐‐ ‐‐ 85 79 ‐‐ ‐‐ ‐‐ 210.4 128.0 145.0 140.0 149.7 4.2 4.9 ‐‐ ‐‐ ‐‐ 0 0 ‐‐ ‐‐ ‐‐ ‐‐ ‐‐ ‐‐ ‐‐ ‐‐ 9.3 10.3 ‐‐ ‐‐ ‐‐ 11/28/2011 LH 8:00 150‐200 ‐‐ 79 255.1 7.9 0.3 ‐‐ 7.6 12/1/2011 12/5/2011 ‐‐ LH ‐‐‐ 8:30 ‐‐‐ 150‐200 ‐‐ ‐‐ ‐‐ 98 ‐‐ 88.7 ‐‐ 5.9 ‐‐ 1 ‐‐ ‐‐ ‐‐ 9.7 12/6/2011 LH 8:00 150‐200 220 100 94.1 6.5 0 ‐‐ 9.0 12/8/2011 12/9/2011 LH LH 8:00 7:30 150‐200 150‐200 237 226 100 98 206.0 245.0 6.7 0 0 0 ‐‐ 0 9.2 8.2 12/12/2011 LH 13:00 150‐200 242 98 195.1 0 0 0 8.3 ‐‐‐ 12/13/2011 12/15/2011 12/15/2011 12/15/2011 LH SW LH LH 9:00 8:30 12:30 14:55 150‐200 150‐200 150‐200 150‐200 190 175 160 172 97 ‐‐ 95 100 205.8 206.0 225.8 238.7 0 5 13 14 0 0 0 0 0 0 0 0 8.2 8.7 8.4 8.3 Sampled at 13:40 ‐‐‐ ‐‐‐ Partially closed dilution valve; shutdown after monitoring 1/16/2012 LH/RK 16:00 350‐400 80.5 100 108.8 2 0 0 10.9 Restart w/ SVE from TSSV‐1‐M 1/17/2012 RK 12:00 350‐400 92.0 100 147.8 3 0 0 9.5 Sampling equipment contamination resulting in elevated PID readings 1/17/2012 RK 14:00 350‐400 ‐‐ ‐‐ 130.6 ‐‐ ‐‐ ‐‐ ‐‐ 1/18/2012 RK 11:00 350‐400 87.0 100 149.6 2 0 0 10.2 Reading after replacing contaminated equipment ‐‐‐ 1/19/2012 1/20/2012 SW LH 9:00 8:00 350‐400 ‐‐‐ 126.0 ‐‐ 100 ‐‐ 101.0 ‐‐ 1 ‐‐ 0 ‐‐ 0 ‐‐ 20.7 ‐‐ Shutdown after monitoring Carbon changeout 1/20/2012 LH/RK 12:04 350‐400 ‐‐ ‐‐ 156.9 ‐‐ ‐‐ ‐‐ ‐‐ 1/20/2012 LH/RK 13:45 350‐400 88.5 100 129.2 3 0 0 11.1 Sampled Influent/TSSV‐1‐M at 14:21 1/21/2012 1/22/2012 1/23/2012 1/24/2012 SW SW SW LH 9:00 10:02 8:14 12:30 350‐400 350‐400 350‐400 350‐400 ‐‐ ‐‐ ‐‐ 89.6 ‐‐ ‐‐ 100 100 140.2 159.4 143.9 142.8 2 2 8 7 0 0 0 0 0 0 0 0 13.1 8.1 6.5 9.0 ‐‐‐ ‐‐‐ ‐‐‐ ‐‐‐ 1/26/2012 SW 8:13 350‐400 ‐‐ 100 70.3 0 0 0 15.6 ‐‐‐ 1/27/2012 LH 15:30 350‐400 90.2 100 163.9 8 0 0 8.7 ‐‐‐ 1/30/2012 1/31/2012 RK LH 12:01 12:00 350‐400 350‐400 95.5 89.7 100 100 169.5 183.4 2 6 0 0 0 0 9.2 9.0 2/3/2012 2/7/2012 LH LH 9:00 10:00 350‐400 350‐400 96.7 91.3 100 100 165.0 176.5 7 6 0 0 0 0 6.0 6.8 ‐‐‐ Sampled Influent/TSSV‐1‐M at approx. 12:00 ‐‐‐ Vacuum monitored at TSSV‐1‐S was 0.08 in‐H2O; vacuum monitored at TSSV‐1‐D was 0.23 in‐H2O 2/16/2012 2/20/2012 RK RK/LH 11:46 11:14 350‐400 350‐400 90.5 96.5 100 100 166.2 169.6 8 4 5 5 0 0 4.1 5.0 2/20/2012 RK/LH 13:20 549‐599 46.7 100 160.1 13 36 0 2.5 2/21/2012 2/29/2012 RK RK 14:31 11:01 549‐599 549‐599 60.0 60.5 100 95 161.2 176.4 5 0 13 45 0 0 17.7 3.1 S; sampled at 18:05 ‐‐‐ ‐‐‐ ‐‐‐ Sampled at 10:10 Rented PID (previous measurements are w/this PID) County PID (subsequent measurements are w/ this PID); shutdown after monitoring Carbon changeout Restart w/ SVE from PW and TSSV‐1‐ S; closed PW afterwards Modifications made to piping to enable flow measurement ‐‐‐ County 4‐Gas Meter (subsequent measurements are w/ this meter) Restart w/ SVE from TSSV‐1‐M ‐‐‐ Sampled at 11:11; vacuum measured at TSSV‐1‐S was 1.4 in‐H2O; vacuum monitored at TSSV‐1‐D was over 2 in‐ H2O Switched to extraction from TSSV‐1‐ D; sampled at 13:28; vacuum measured at TSSV‐1‐S was 1.9 in‐ H2O; vacuum at TSSV‐1‐M was 1.9 in‐ H2O ‐‐‐ Vacuum measured at TSSV‐1‐S was 0.67 in‐H2O; vacuum measured at TSSV‐1‐M was 1.46 in‐H2O; sampled Influent/TSSV‐1‐D at 13:38; shutdown after sampling Notes: Blue text identifies anomolous data 11/19/2012 Page 2 of 6 Prepared by: RK Checked by: NCL Cave Creek Landfill, Maricopa County Appendix K. Extended SVE Pilot Test Operational Data Influent Monitoring Vacuum [in-H2O] 80 Temperature [deg F] ‐‐ PID Reading [ppmV] 88.0 Wellhead CO Reading [%] 7.0 Wellhead CH4 Reading [% LEL] 4 Wellhead Wellhead H2 S O Reading 2 Reading Comments [%] [%] Startup w/SVE from PW and TSSV‐1‐S; ‐‐ 10.0 Date [MM/DD/YY] 11/16/2011 Operator [Initials] LH Time [24-h] 14:00 Flow Rate [scfm] ‐‐‐ 11/17/2011 11/18/2011 11/21/2011 11/23/2011 11/28/2011 LH LH/RK RK RK LH 6:30 8:49 9:30 9:30 8:00 ‐‐‐ ‐‐‐ ‐‐‐ ‐‐‐ ‐‐‐ 85 85 80 ‐‐‐ ‐‐‐ ‐‐ ‐‐ ‐‐ ‐‐ ‐‐ 130.0 99.1 109.0 140.0 145.7 6.5 7.0 ‐‐ ‐‐ ‐‐ 0 4 ‐‐ ‐‐ ‐‐ ‐‐ ‐‐ ‐‐ ‐‐ ‐‐ 10.5 8.8 ‐‐ ‐‐ ‐‐ 11/28/2011 LH 8:00 ‐‐‐ 79 ‐‐ 198.9 9.0 8 ‐‐ 8.2 12/1/2011 12/5/2011 ‐‐ LH ‐‐‐ 8:30 ‐‐‐ ‐‐‐ ‐‐‐ 100 ‐‐‐ ‐‐ ‐‐‐ 88.7 ‐‐‐ 4.9 ‐‐‐ 0 ‐‐‐ ‐‐ ‐‐‐ 12.1 12/6/2011 LH 8:00 ‐‐‐ 100 ‐‐ 93.2 6.5 0 ‐‐ 9.8 12/8/2011 12/9/2011 LH LH 8:00 7:30 ‐‐‐ 298 100 100 ‐‐ ‐‐ 127.6 120.2 3.0 0 0 0 ‐‐ 0 15.1 13.6 12/12/2011 LH 13:00 285 100 67.0 109.8 0 0 0 13.8 12/13/2011 12/15/2011 12/15/2011 12/15/2011 LH SW LH LH 9:00 8:30 12:30 14:55 290 230 255 260 100 85 95 100 67.4 ‐‐ 72.8 71.7 120.6 106.0 127.8 168.7 0 5 5 5 0 0 0 0 0 0 0 0 13.0 13.8 13.7 12.2 1/16/2012 LH/RK 16:00 82.5 100 73.0 122.5 4 0 0 11.0 Restart w/ SVE from TSSV‐1‐M; sampled at 16:00 1/17/2012 RK 12:00 99.5 100 77.0 149.6 1 0 0 8.2 Sampling equipment contamination resulting in elevated PID readings 1/17/2012 RK 14:00 ‐‐ ‐‐ ‐‐ 129.1 ‐‐ ‐‐ ‐‐ ‐‐ 1/18/2012 RK 11:00 94.0 100 72.4 150.9 1 0 0 8.5 Reading after replacing contaminated equipment ‐‐‐ 1/19/2012 1/20/2012 SW LH 9:00 8:00 ‐‐ ‐‐ 100 ‐‐ ‐‐ ‐‐ 109.2 ‐‐ 1 ‐‐ 0 ‐‐ 0 ‐‐ 20.7 ‐‐ Shutdown after monitoring Carbon changeout 1/20/2012 LH/RK 12:30 ‐‐ ‐‐ ‐‐ 134.6 ‐‐ ‐‐ ‐‐ ‐‐ 1/20/2012 LH/RK 13:45 97.0 100 78.4 149.1 2 0 0 7.8 Sampled Influent/TSSV‐1‐M at 14:21 1/21/2012 1/22/2012 1/23/2012 1/24/2012 SW SW SW LH 9:06 10:06 8:21 12:40 ‐‐ ‐‐ ‐‐ 92.7 ‐‐ 100 100 100 ‐‐ ‐‐ ‐‐ 76.9 145.0 175.1 165.6 148.7 2 2 9 9 0 0 0 0 0 0 0 0 8.2 10.3 6.1 8.4 ‐‐‐ ‐‐‐ ‐‐‐ ‐‐‐ 1/26/2012 SW 8:25 ‐‐ ‐‐ ‐‐ 157.8 2 0 0 9.6 ‐‐‐ 1/27/2012 LH 15:45 90.8 100 79.2 151.8 9 0 0 9.2 ‐‐‐ 1/30/2012 1/31/2012 RK LH 12:06 12:13 94.5 90.2 100 100 82.1 80.7 157.6 173.9 6 8 0 0 0 0 6.6 8.7 2/3/2012 2/7/2012 LH LH 9:30 10:10 95.8 92.7 100 100 75.7 77.8 163.0 156.5 4 5 0 0 0 0 10.8 9.7 ‐‐‐ Sampled Influent/TSSV‐1‐M at approx. 12:00 ‐‐‐ ‐‐‐ 2/16/2012 2/20/2012 RK RK/LH 11:40 11:20 91.0 99.5 100 100 76.5 74.1 153.7 165.3 1 3 5 5 0 0 4.9 4.9 ‐‐‐ ‐‐‐ 2/20/2012 RK/LH 13:27 47.5 100 74.6 158.7 12 37 0 2.6 ‐‐‐ 2/21/2012 2/29/2012 RK RK 14:42 11:05 65.0 64.5 100 95 86.2 75.0 150.1 178.1 13 4 41 43 0 0 2.8 2.1 ‐‐‐ Sampled Influent/TSSV‐1‐D at 13:38; shutdown after sampling sampled at 18:00 ‐‐‐ ‐‐‐ ‐‐‐ ‐‐‐ Rented PID (previous measurements are w/this PID) County PID (subsequent measurements are w/ this PID); shutdown after monitoring Carbon changeout Restart w/ SVE from PW and TSSV‐1‐S; closed PW to SVE after monitoring Modifications made to piping to enable flow measurement Dilution air valve open 10% County 4‐Gas Meter (subsequent measurements are w/ this meter); sampled at 10:25 Raining; humidity suspected of impacting PID readings Sampled at 13:35 ‐‐‐ ‐‐‐ Shutdown after monitoring Restart w/ SVE from TSSV‐1‐M Notes: Blue text identifies anomolous data 11/19/2012 Page 3 of 6 Prepared by: RK Checked by: NCL Cave Creek Landfill, Maricopa County Appendix K. Extended SVE Pilot Test Operational Data Carbon/Hydrosil System Monitoring PID PID PID Reading Control Carbon PID Reading Reading After Hydrosil Efficiency Control Run Influent After After Lag Unit (System of Lead Efficiency Time Reading Lead Unit Unit Effluent) Unit of System Comments [days] [ppmV] [ppmV] [ppmV] [ppmV] [%] [%] Startup w/SVE from PW and TSSV‐1‐S 0 88.0 2.3 1.0 1.0 97.4% 98.9% Date [MM/DD/YY] 11/16/2011 Operator [Initials] LH Time [24-h] 14:00 11/17/2011 11/18/2011 11/21/2011 11/23/2011 11/28/2011 LH LH/RK RK RK LH 6:30 8:49 9:30 9:30 8:00 1 2 5 7 12 130.0 99.1 109.0 140.0 145.7 2.7 6.3 12.0 1.4 120.8 1.0 2.3 1.8 2.2 32.5 1.5 0.0 0.3 1.3 22.3 97.9% 93.6% 89.0% 99.0% 17.1% 98.8% 100.0% 99.7% 99.1% 84.7% 11/28/2011 LH 8:00 12 198.9 139.8 45.6 35.8 29.7% 82.0% 12/1/2011 12/5/2011 ‐‐ LH ‐‐‐ 8:30 0 0 ‐‐‐ 88.7 ‐‐‐ 0.7 ‐‐‐ 0.2 ‐‐‐ 0.2 ‐‐‐ 99.2% ‐‐‐ 99.8% 12/6/2011 LH 8:00 1 93.2 0.8 0.4 0.3 99.1% 99.7% Carbon changeout Restart w/ SVE from PW and TSSV‐1‐S; closed PW to SVE after monitoring ‐‐‐ 12/8/2011 12/9/2011 LH LH 8:00 7:30 3 4 127.6 120.2 2.0 2.8 2.7 2.4 3.5 3.7 98.4% 97.7% 97.3% 96.9% ‐‐‐ ‐‐‐ 12/12/2011 LH 13:00 7 109.8 12.4 4.2 2.3 88.7% 97.9% 12/13/2011 12/15/2011 12/15/2011 12/15/2011 LH SW LH LH 9:00 8:30 12:30 14:55 8 10 10 10 120.6 106.0 127.8 168.7 7.5 5.3 7.6 7.8 1.7 5.9 5.2 5.3 2.3 12.1 3.8 4.3 93.8% 95.0% 94.1% 95.4% 98.1% 88.6% 97.0% 97.5% Raining; humidity suspected of impacting PID readings ‐‐‐ ‐‐‐ ‐‐‐ Shutdown after monitoring 1/16/2012 LH/RK 16:00 11 122.5 13.8 7.9 2.7 88.7% 97.8% 1/17/2012 RK 12:00 13 149.6 23.0 14.1 9.2 84.6% 93.9% 1/17/2012 RK 14:00 15 129.1 9.5 2.9 0.8 92.6% 99.4% 1/18/2012 RK 11:00 18 150.9 8.5 2.9 0.9 94.4% 99.4% Reading after replacing contaminated equipment ‐‐‐ 1/19/2012 1/20/2012 SW LH 9:00 8:00 22 0 109.2 ‐‐‐ 11.2 ‐‐‐ 3.9 ‐‐‐ 8.2 ‐‐‐ 89.7% ‐‐‐ 92.5% ‐‐‐ Shutdown after monitoring Carbon changeout; extra vessel onsite 1/20/2012 LH/RK 12:30 0 134.6 0.5 0.3 0.6 99.6% 99.6% Restart w/ SVE from TSSV‐1‐M; began operations with three carbon vessels in series 1/20/2012 LH/RK 13:45 0 149.1 0.9 0.7 0.5 99.4% 99.7% ‐‐‐ 1/21/2012 1/22/2012 1/23/2012 1/24/2012 SW SW SW LH 9:06 10:06 8:21 12:55 1 2 3 4 145.0 175.1 165.6 148.7 7.8 8.0 6.3 5.9 2.3 2.8 2.6 2.4 / 2.3 1.5 1.4 1.7 1.5 94.6% 95.4% 96.2% 96.0% 99.0% 99.2% 99.0% 99.0% 1/26/2012 SW 8:25 6 157.8 9.2 4.2 / 3.3 2.8 94.2% 98.2% 1/27/2012 LH 15:50 7 151.8 8.7 6.2 1.5 94.3% 99.0% 1/30/2012 1/31/2012 RK LH 12:06 12:25 10 11 157.6 173.9 1.8 10.2 0.5 6.8 0.4 3.7 98.9% 94.1% 99.7% 97.9% ‐‐‐ ‐‐‐ ‐‐‐ Secondary measurements were collected after third carbon vessel Secondary measurements were collected after third carbon vessel Disconnected third vessel; continued operation with first two vessels ‐‐‐ ‐‐‐ 2/3/2012 2/7/2012 LH LH 9:30 10:10 14 18 163.0 156.5 1.4 3.7 2.0 6.5 3.0 6.2 99.1% 97.6% 98.2% 96.0% ‐‐‐ ‐‐‐ 2/16/2012 2/20/2012 RK RK/LH 11:40 11:20 27 31 153.7 165.3 11.6 35.7 2.6 10.5 0.5 5.0 92.5% 78.4% 99.7% 97.0% ‐‐‐ After collecting data, disconnected lead vessel and made lag new lead; connected former third vessel as new lag 2/20/2012 RK/LH 13:27 31 158.7 11.2 1.7 0.3 92.9% 99.8% ‐‐‐ 2/21/2012 2/29/2012 RK RK 14:42 11:05 32 40 150.1 178.1 31.0 47.0 11.0 7.5 1.9 0.5 79.3% 73.6% 98.7% 99.7% ‐‐‐ Shutdown after sampling ‐‐‐ ‐‐‐ ‐‐‐ ‐‐‐ Rented PID (previous measurements are w/this PID) County PID (subsequent measurements are w/ this PID); shutdown after monitoring Restart w/ SVE from TSSV‐1‐M; sampling equipment contamination resulting in elevated PID readings Sampling equipment contamination resulting in elevated PID readings Notes: Blue text identifies anomolous data 11/19/2012 Page 4 of 6 Prepared by: RK Checked by: NCL Cave Creek Landfill, Maricopa County Appendix K. Extended SVE Pilot Test Operational Data Effluent and Blower Monitoring Blower Vacuum Discharge TemperDischarge Hour Meter (preature Flow Rate Reading blower) [deg F] [acfm] [hrs] [in-H2O] 80 160 500 4176.1 Elapsed Blower Hours [hrs] 0 Phase Blower Converter Amperage Amperage Comments [amps] [amps] Startup w/SVE from PW and TSSV‐1‐S 49.3 72.1 Date [MM/DD/YY] 11/16/2011 Operator [Initials] LH Time [24-h] 14:00 11/17/2011 11/18/2011 11/21/2011 11/23/2011 11/28/2011 LH LH/RK RK RK LH 6:30 8:30 9:30 9:30 8:00 85 85 85 ‐‐ ‐‐ 160 160 160 ‐‐ ‐‐ 500 500 500 ‐‐ ‐‐ 4192.7 4217.5 ‐‐ ‐‐ ‐‐ 16.6 41.4 ‐‐ ‐‐ ‐‐ 49.5 50.2 ‐‐ ‐‐ ‐‐ 73.2 74.8 ‐‐ ‐‐ ‐‐ ‐‐‐ ‐‐‐ ‐‐‐ ‐‐‐ ‐‐‐ 11/28/2011 LH 8:00 79 160 500 4457.5 281.4 50.3 74.6 Shutdown after monitoring 12/1/2011 12/5/2011 ‐‐ LH ‐‐ 8:30 ‐‐ 100 ‐‐ 200 ‐‐ 500 ‐‐ 4458.2 ‐‐ 282.1 ‐‐ 50.1 ‐‐ 73.2 12/6/2011 LH 8:00 100 195 500 4483.6 307.5 50.8 75.6 Carbon changeout Restart w/ SVE from PW and TSSV‐1‐S; closed PW afterwards ‐‐‐ 12/8/2011 12/9/2011 LH LH 8:00 7:30 100 100 200 198 400 400 4531.5 4554.2 355.4 378.1 53.5 51.8 79.7 77.2 ‐‐‐ ‐‐‐ 12/12/2011 LH 13:00 100 195 400 4630.2 454.1 51.6 76.7 ‐‐‐ 12/13/2011 12/15/2011 12/15/2011 12/15/2011 LH SW LH LH 9:00 8:30 12:30 14:55 100 85 95 100 195 170 200 200 400 425 400 400 4651.1 4696.9 4701.2 4703.5 475.0 520.8 525.1 527.4 51.2 ‐‐ 50.1 53.2 77.1 ‐‐ 76.5 78.5 ‐‐‐ ‐‐‐ ‐‐‐ Shutdown after monitoring 1/16/2012 LH/RK 12:00 100 250 ‐‐‐ 4704.9 528.8 50.0 70.0 Restart w/ SVE from TSSV‐1‐M; discharge flow gage inoperable 1/17/2012 RK 12:00 100 250 ‐‐ 4727.3 551.2 ‐‐ ‐‐ ‐‐‐ 1/17/2012 RK 14:00 ‐‐ ‐‐ ‐‐ ‐‐ ‐‐ ‐‐ ‐‐ ‐‐‐ 1/18/2012 RK 11:00 100 250 ‐‐ 4750.4 574.3 ‐‐ ‐‐ ‐‐‐ 1/19/2012 1/20/2012 SW LH 9:00 8:00 ‐‐ ‐‐ ‐‐ ‐‐ ‐‐ ‐‐ 4775.4 ‐‐ 599.3 ‐‐ ‐‐ ‐‐ ‐‐ ‐‐ Shutdown after monitoring Carbon changeout 1/20/2012 LH/RK 12:00 ‐‐ ‐‐ ‐‐ ‐‐ ‐‐ ‐‐ ‐‐ Restart w/ SVE from TSSV‐1‐M 1/20/2012 LH/RK 13:45 100 250 ‐‐ 4777.8 601.7 ‐‐ ‐‐ ‐‐‐ 1/21/2012 1/22/2012 1/23/2012 1/24/2012 SW SW SW LH 9:00 10:23 8:50 13:10 ‐‐ 100 100 100 ‐‐ ‐‐ ‐‐ 250 ‐‐ ‐‐ ‐‐ ‐‐ ‐‐ 4822.5 4845.0 4873.3 ‐‐ 646.4 668.9 697.2 ‐‐ ‐‐ ‐‐ 52.7 ‐‐ ‐‐ ‐‐ 73.8 ‐‐‐ ‐‐‐ ‐‐‐ ‐‐‐ 1/26/2012 SW 8:58 100 250 ‐‐ 4917.1 741.0 ‐‐ ‐‐ ‐‐‐ 1/27/2012 LH 15:55 100 250 ‐‐ 4948.1 772.0 53.8 75.6 ‐‐‐ 1/30/2012 1/31/2012 RK LH 12:35 12:55 100 100 250 250 ‐‐ ‐‐ 5016.7 5040.4 840.6 864.3 ‐‐ 54.6 ‐‐ 77.8 ‐‐‐ Greased blower; checked oil 2/3/2012 2/7/2012 LH LH 10:25 10:40 100 100 250 250 ‐‐ ‐‐ 5110.7 5206.9 934.6 1,030.8 56.7 56.4 79.4 77.2 ‐‐‐ ‐‐‐ 2/16/2012 2/20/2012 RK RK/LH 12:20 11:15 100 100 250 250 ‐‐ ‐‐ 5424.3 5519.8 1,248.2 1,343.7 ‐‐ ‐‐ ‐‐ ‐‐ ‐‐‐ ‐‐‐ 2/20/2012 RK/LH 13:20 100 ‐‐ ‐‐ ‐‐ ‐‐ ‐‐ ‐‐ ‐‐‐ 2/21/2012 2/29/2012 RK RK 14:30 11:20 100 95 275 275 ‐‐ ‐‐ 5546.9 5735.4 1,370.8 1,559.3 ‐‐ ‐‐ ‐‐ ‐‐ ‐‐‐ Shutdown after sampling Notes: Blue text identifies anomolous data 11/19/2012 Page 5 of 6 Prepared by: RK Checked by: NCL Cave Creek Landfill, Maricopa County Appendix K. Extended SVE Pilot Test Operational Data Recirculation and Condensate Monitoring Calculated Recirculation Dilution Flow Valve Setting Rate [%Open] [scfm] 15 0 Dilution Valve Setting [%Open] 0 Knockout Tank Volume [gal] 0 Knockout Tank Vacuum [in-H2O] 80 Condensate Storage Tank Volume Comments [gal] Startup w/SVE from PW and TSSV‐1‐S 0 Date [MM/DD/YY] 11/16/2011 Operator [Initials] LH Time [24-h] 14:00 11/17/2011 11/18/2011 11/21/2011 11/23/2011 11/28/2011 LH LH/RK RK RK LH 6:30 7:00 9:30 9:30 8:00 15 15 15 ‐‐ ‐‐ 0 0 0 ‐‐ ‐‐ 0 0 0 ‐‐ ‐‐ 0 0 0 ‐‐ ‐‐ 80 85 85 ‐‐ ‐‐ 0 0 0 ‐‐ ‐‐ ‐‐‐ ‐‐‐ ‐‐‐ ‐‐‐ ‐‐‐ 11/28/2011 LH 8:00 15 0 0 0 79 0 ‐‐‐ 12/1/2011 12/5/2011 ‐‐ LH ‐‐ 8:30 ‐‐ 15 ‐‐ 0 ‐‐ 0 ‐‐ 0 ‐‐ 100 ‐‐ 0 12/6/2011 LH 8:00 15 0 0 10 100 0 Carbon changeout Restart w/ SVE from PW and TSSV‐1‐S; closed PW afterwards ‐‐‐ 12/8/2011 12/9/2011 LH LH 8:00 7:30 10 10 ‐‐ ‐‐ 10 15 10 0 100 98 0 15 ‐‐‐ Pumped to knockout to storage 12/12/2011 LH 13:00 10 ‐‐ 15 0 100 15 ‐‐‐ 12/13/2011 12/15/2011 12/15/2011 12/15/2011 LH SW LH LH 9:00 8:30 12:30 14:55 10 10 10 10 100 31 95 88 15 15 15 10 10 10 0 0 100 85 95 100 15 15 25 25 ‐‐‐ ‐‐‐ Pumped to knockout to storage Partially closed dilution valve; shutdown after monitoring 1/16/2012 LH/RK 12:00 15 0 0 0 100 25 1/17/2012 RK 12:00 15 0 0 0 100 25 Restart w/ SVE from TSSV‐1‐M; recirculation valve opened to 15% open; no dilution ‐‐‐ 1/17/2012 RK 14:00 ‐‐ ‐‐ ‐‐ ‐‐ ‐‐ ‐‐ ‐‐‐ 1/18/2012 RK 11:00 10 0 0 0 100 25 Closed recirculation valve setting to 10% open to maintain 100 in vacuum 1/19/2012 1/20/2012 SW LH 9:00 8:00 ‐‐ ‐‐ ‐‐ ‐‐ ‐‐ ‐‐ ‐‐ ‐‐ ‐‐ ‐‐ ‐‐ ‐‐ Shutdown after monitoring Carbon changeout 1/20/2012 LH/RK 12:00 ‐‐ ‐‐ ‐‐ ‐‐ ‐‐ ‐‐ Restart w/ SVE from TSSV‐1‐M; no dilution 1/20/2012 LH/RK 13:45 ‐‐ ‐‐ ‐‐ ‐‐ ‐‐ ‐‐ ‐‐‐ 1/21/2012 1/22/2012 1/23/2012 1/24/2012 SW SW SW LH 9:00 10:23 8:50 13:15 ‐‐ ‐‐ ‐‐ 10 ‐‐ ‐‐ ‐‐ 0 ‐‐ ‐‐ ‐‐ 0 ‐‐ ‐‐ ‐‐ 0 ‐‐ ‐‐ ‐‐ 100 ‐‐ ‐‐ ‐‐ 25 ‐‐‐ ‐‐‐ ‐‐‐ ‐‐‐ 1/26/2012 SW 8:58 ‐‐ ‐‐ ‐‐ ‐‐ ‐‐ ‐‐ ‐‐‐ 1/27/2012 LH 16:00 10 0 0 0 100 25 ‐‐‐ 1/30/2012 1/31/2012 RK LH 12:35 12:50 10 10 0 0 0 0 0 0 100 100 25 25 ‐‐‐ ‐‐‐ 2/3/2012 2/7/2012 LH LH 10:35 10:50 10 10 0 0 0 0 0 0 100 100 25 25 ‐‐‐ ‐‐‐ 2/16/2012 2/20/2012 RK RK/LH 12:20 11:15 10 10 0 0 0 0 0 0 100 100 25 25 ‐‐‐ ‐‐‐ 2/20/2012 RK/LH 13:30 20 0 0 0 100 25 Opened recirculation valve to 20% open 2/21/2012 2/29/2012 RK RK 14:30 11:20 20 10 0 0 0 0 0 0 100 100 25 25 ‐‐‐ Closed recirculation valve setting to 10% open to maintain 100 in vacuum; shutdown after sampling Notes: Blue text identifies anomolous data 11/19/2012 Page 6 of 6 Prepared by: RK Checked by: NCL Appendix K. Extended SVE Pilot Test Operational Data Cave Creek Landfill, Maricopa County Induced Vacuum(1) Well Name Date Time [Inches H2O] Test well operating NDP‐1 D 11/18/2011 11:05 ‐0.25 TSSV1‐S & PW 11/21/2011 11:36 0.76 TSSV1‐S & PW 11/21/2011 13:10 0.52 TSSV1‐S & PW 11/21/2011 14:55 0.46 TSSV1‐S & PW NDP‐1 S ODP‐1 D ODP‐1 S ODP‐2 D 11/19/2012 11/23/2011 11:18 ‐0.5 TSSV1‐S & PW 1/17/2012 13:00 0.43 TSSV1‐M 2/20/2012 12:49 0.15 TSSV1‐D 2/29/2012 11:55 0.31 TSSV1‐D 11/18/2011 11:05 ‐0.185 TSSV1‐S & PW 11/21/2011 11:36 0.47 TSSV1‐S & PW 11/21/2011 13:03 0.28 TSSV1‐S & PW 11/21/2011 14:54 0.24 TSSV1‐S & PW 11/23/2011 11:12 ‐0.55 TSSV1‐S & PW 1/17/2012 13:01 0.22 TSSV1‐M 2/20/2012 12:49 0.15 TSSV1‐D 2/29/2012 11:55 0.14 TSSV1‐D 11/18/2011 10:37 ‐0.18 TSSV1‐S & PW 11/21/2011 11:16 1.09 TSSV1‐S & PW 11/21/2011 13:37 0.79 TSSV1‐S & PW 11/21/2011 15:19 0.63 TSSV1‐S & PW 11/23/2011 11:30 0.01 TSSV1‐S & PW 1/17/2012 13:34 0.58 TSSV1‐M 2/20/2012 13:00 0.25 TSSV1‐D 2/29/2012 12:11 0.46 TSSV1‐D 11/18/2011 10:37 ‐0.09 TSSV1‐S & PW 11/21/2011 11:14 0.64 TSSV1‐S & PW 11/21/2011 13:36 0.45 TSSV1‐S & PW 11/21/2011 15:18 0.34 TSSV1‐S & PW 11/23/2011 11:24 0.01 TSSV1‐S & PW 1/17/2012 13:33 0.28 TSSV1‐M 2/20/2012 13:00 0.5 TSSV1‐D 2/29/2012 12:11 0.23 TSSV1‐D 11/18/2011 10:25 ‐0.12 TSSV1‐S & PW 11/21/2011 11:20 0.94 TSSV1‐S & PW 11/21/2011 13:32 0.69 TSSV1‐S & PW 11/21/2011 15:07 0.55 TSSV1‐S & PW 11/23/2011 12:00 ‐0.07 TSSV1‐S & PW 1/17/2012 13:28 0.44 TSSV1‐M 2/20/2012 12:58 0.29 TSSV1‐D 2/29/2012 12:07 0.38 TSSV1‐D Page 1 of 3 Appendix K. Extended SVE Pilot Test Operational Data Cave Creek Landfill, Maricopa County Induced Vacuum(1) Well Name Date Time [Inches H2O] Test well operating ODP‐2 S 11/18/2011 10:25 ‐0.09 TSSV1‐S & PW 11/21/2011 11:19 0.55 TSSV1‐S & PW 11/21/2011 13:32 0.44 TSSV1‐S & PW 11/21/2011 15:06 0.33 TSSV1‐S & PW 11/23/2011 11:54 ‐0.02 TSSV1‐S & PW 1/17/2012 13:27 0.16 TSSV1‐M 2/20/2012 12:58 0.49 TSSV1‐D ODP‐3 D ODP‐3 S P‐25 P‐8 11/19/2012 2/29/2012 12:07 0.2 TSSV1‐D 11/18/2011 10:14 2 TSSV1‐S & PW 11/21/2011 11:27 0.99 TSSV1‐S & PW 11/21/2011 13:24 0.78 TSSV1‐S & PW 11/21/2011 15:02 0.69 TSSV1‐S & PW 11/23/2011 11:42 ‐0.12 TSSV1‐S & PW 1/17/2012 13:22 0.53 TSSV1‐M 2/20/2012 12:52 0.3 TSSV1‐D 2/29/2012 12:03 0.47 TSSV1‐D 11/18/2011 10:14 ‐0.03 TSSV1‐S & PW 11/21/2011 11:26 0.7 TSSV1‐S & PW 11/21/2011 13:23 0.5 TSSV1‐S & PW 11/21/2011 15:01 0.42 TSSV1‐S & PW 11/23/2011 11:36 ‐0.04 TSSV1‐S & PW 1/17/2012 13:21 0.31 TSSV1‐M 2/20/2012 12:52 0.49 TSSV1‐D 2/29/2012 12:03 0.26 TSSV1‐D 11/18/2011 10:55 ‐0.05 TSSV1‐S & PW 11/21/2011 10:56 0.17 TSSV1‐S & PW 11/21/2011 13:15 0.11 TSSV1‐S & PW 11/21/2011 14:45 0.13 TSSV1‐S & PW 11/23/2011 11:06 0.01 TSSV1‐S & PW 1/17/2012 13:06 0.05 TSSV1‐M 2/20/2012 12:42 0.03 TSSV1‐D 2/29/2012 11:52 0.7 TSSV1‐D 11/18/2011 10:20 0.01 TSSV1‐S & PW 11/21/2011 11:00 0.001 TSSV1‐S & PW 11/21/2011 13:18 0.001 TSSV1‐S & PW 11/21/2011 14:48 0.001 TSSV1‐S & PW 11/23/2011 11:00 0.001 TSSV1‐S & PW 1/17/2012 13:13 0.001 TSSV1‐M 2/20/2012 12:45 0.02 TSSV1‐D 2/29/2012 11:58 0.005 TSSV1‐D Page 2 of 3 Appendix K. Extended SVE Pilot Test Operational Data Cave Creek Landfill, Maricopa County Induced Vacuum(1) Well Name Date Time [Inches H2O] Test well operating PW 12/13/2011 9:00 ‐0.09 TSSV1‐S TSSV1‐S TSSV1‐M TSSV1‐D 12/15/2011 12:30 0.15 TSSV1‐S 12/15/2011 14:55 0.15 TSSV1‐S 2/20/2012 11:15 1.3‐1.49 TSSV1‐D 2/29/2012 11:00 1.24 TSSV1‐D 2/7/2012 10:00 0.08 TSSV1‐M 2/20/2012 11:14 1.4 TSSV1‐D 2/20/2012 13:20 1.9 TSSV1‐D 2/29/2012 11:01 0.67 TSSV1‐D 2/20/2012 13:20 1.9 TSSV1‐D 2/29/2012 11:01 1.46 TSSV1‐D 2/7/2012 10:00 0.23 TSSV1‐M 2/20/2012 11:14 >2 TSSV1‐M Notes: (1) Negative values are pressure and positive values are vacuum 11/19/2012 Page 3 of 3 APPLIED VACUUM VERSUS OBSERVED FLOW ‐ TSSV‐1‐S One Day and Extended SVE Pilot Test Data 1000 Flow [scfm] 100 One Day Test Extended Test Linear (One Day Test) 10 1 0 20 40 60 Vacuum [inches‐water] 80 100 120 APPLIED VACUUM VERSUS OBSERVED FLOW ‐ TSSV‐1‐M One Day and Extended SVE Pilot Test Data 1000 Flow [scfm] 100 One Day Test Extended Test Linear (One Day Test) 10 1 0 20 40 60 Vacuum [inches‐water] 80 100 120 APPLIED VACUUM VERSUS OBSERVED FLOW ‐ TSSV‐1‐D One Day and Extended SVE Pilot Test Data 1000 Flow [scfm] 100 One Day Test Extended Test Linear (One Day Test) 10 1 0 20 40 60 Vacuum [inches‐water] 80 100 120 APPLIED VACUUM VERSUS OBSERVED FLOW ‐ PW One Day and Extended SVE Pilot Test Data 1000 Flow [scfm] 100 One Day Test Extended Test Linear (One Day Test) 10 1 0 20 40 60 Vacuum [inches‐water] 80 100 120 TCE CONCENTRATION AT WELLHEAD OVER DURATION OF EXTRACTION Extended SVE Pilot Study 3000 2500 TCE Con ncentration [mg/m3] 2000 TSSV‐1‐S 1500 TSSV‐1‐M TSSV‐1‐D 1000 500 0 0 100 200 300 400 500 Duration of Extraction [hrs] 600 700 800 900 TCE CONCENTRATION AT WELLHEAD OVER VOLUME OF EXTRACTION Extended SVE Pilot Study 3,000 2,500 TCE Con ncentration [mg/m3] 2,000 TSSV‐1‐S 1,500 TSSV‐1‐M TSSV‐1‐D 1,000 500 0 0 1,000,000 2,000,000 3,000,000 4,000,000 Volume of Extraction [cubic feet] 5,000,000 6,000,000 7,000,000 APPLIED VACUUM VERSUS OBSERVED FLOW ‐ One Day and Extended SVE Pilot Test Data ROI=30 Permeability Estimates for Assumed ROI 30 feet 1000 100 Flowarate e estimate [SCFM]] TSSV1 S TSSV1 M TSSV1‐D Permeability 1E‐07 [cm2] P Permeability bili 3.6E‐08 3 6E 08 [[cm2] 2] Permeability 3.2E‐08 [cm2] Permeability 2.2E‐08 [cm2] 10 Permeability 2E‐08 [cm2] Permeability 1.1E‐08 [cm2] 1 0 20 40 60 80 Gauge Vacuum at Well Head [in‐water] 100 120 APPLIED VACUUM VERSUS OBSERVED FLOW ‐ One Day and Extended SVE Pilot Test Data ROI=100 Permeability Estimates for Assumed ROI 100 feet 1000 100 Flowarate e estimate [SCFM]] TSSV1 S TSSV1 M TSSV1‐D Permeability 1.1E‐07 [cm2] P Permeability bili 5E‐08 5E 08 [[cm2] 2] Permeability 4E‐08 [cm2] Permeability 2.6E‐08 [cm2] 10 Permeability 2.2E‐08 [cm2] Permeability 1.3E‐08 [cm2] 1 0 20 40 60 80 Gauge Vacuum at Well Head [in‐water] 100 120 APPLIED VACUUM VERSUS OBSERVED FLOW ‐ One Day and Extended SVE Pilot Test Data ROI=200 Permeability Estimates for Assumed ROI 200 feet 1000 100 Flowarate e estimate [SCFM]] TSSV1 S TSSV1 M TSSV1‐D Permeability 1.6E‐07 [cm2] P Permeability bili 5 5.2E‐08 2E 08 [[cm2] 2] Permeability 4E‐08 [cm2] Permeability 2.9E‐08 [cm2] 10 Permeability 2.6E‐08 [cm2] Permeability 1.4E‐08 [cm2] 1 0 20 40 60 80 Gauge Vacuum at Well Head [in‐water] 100 120