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ST1002-SY120217 KOOS & ASSOCIATES, INC. j� /6 ENGINEERING & ENVIRONMENTAL CONSULTANTS Report of Invasive Screening for Soil Gas Main Street Development 461 West Bethel Road Coppell, Dallas County, Texas 75019 Prepared for City of Coppell 255 Parkway Blvd. Coppell, TX 75019 V / 4 1 4e-01 Valerie Honeycutt, P.G. #4450 D. K. Koos February 17, 2012 10410 MARKISON ROAD • DALLAS, TEXAS 75238 -1650 • (214) 341 -5377 • FAX (214) 341 -7540 • WWW.KOOSINC.COM Report of Invasive Screening for Soil Gas, 461 West Bethel Road, Coppell, TX CONTENTS 1. Introduction 1.1 Background 1.2 Purpose 1.3 Scope 1.4 Limitations and Exclusions 2. Soil Gas Screening 2.1 General 2.2 Description of Soil 2.3 Groundwater Characteristics 2.4 Sampling Points 2.5 Sampling Procedure 2.5 Laboratory Analysis 2.6 Discussion of Laboratory Results 3. Conclusions and Recommendations 3.1 Conclusions 3.2 Recommendations Appendices Appendix A — Figure 1: Site Plan with Sample Locations Figure 2: Site Plan with Approximate Cottage C -1 Footprint Figure 3: Site Plan with Approximate Alternate Cottage Footprints Appendix B - Photographs Appendix C - Gore Surveys Laboratory Report and Chain of Custody Appendix D - Gore Surveys Mapping Report Report for Invasive Screening for Soil Gas, 461 West Bethel Road, Coppell, TX Page 1 1. INTRODUCTION 1.1 Background The subject property (Property) is located at 461 West Bethel Road, Coppell, TX 75019, which was formerly occupied by the Coppell Auto Center, and is also known as the Main Street Development. A Phase I Environmental Site Assessment (ESA) was conducted on the Property in May 2009 by W &M Environmental Group, Inc. (W &M). The May 2009 report identified as recognized environmental conditions (RECs) an automotive repair facility at 461 West Bethel Road with removed underground storage tanks (USTs) as well as an incomplete release investigation with respect to the former USTs. W &M subsequently conducted an investigation of the soil and groundwater at the former automotive service facility. W &M conducted a Phase II and Leaking Petroleum Storage Tank (LPST) investigation with soil and groundwater sampling at 461 West Bethel Road at the automobile repair facility and in the vicinity of their former UST system. An initial round of sampling in July 2009 identified a release of gasoline, diesel fuel, volatile organic compounds (VOCs), and heavy metals. A subsequent investigation, which included permanent wells on- and off -site, identified the groundwater flow at the Property to be to the northeast. Following the delineation of groundwater contamination, excavation activities were completed to remove impacted soil located near the southeast corner of the automotive facility building at the former used oil UST. An Assessment Report Form (ARF) was submitted to the Texas Commission on Environmental Quality (TCEQ) February 2, 2011. Following a review of the Site investigation and remediation activities, the TCEQ granted Site closure for the LPST at 461 West Bethel Road on April 13, 2011. A follow -up Phase I ESA was then conducted in September 2011 by W &M. The Property was identified as Coppell Auto Center in the TCEQ Petroleum Storage Tank (PST) and LPST databases. According to the PST database three 2,000 - gallon and one 250- gallon steel USTs were installed at the Site in 1980 and removed on April 7, 1999. The Site is listed in the LPST database as facility number 118120 due to a leak discovered July 2009. As noted above, W &M conducted the LPST investigation on behalf of the City of Coppell in 2009 and 2010, and the facility received closure on April 13, 2011. According to the report, one historical recognized environmental condition (HREC) was identified, specifically, the LPST listing for the Former Coppell Auto Center, which received final concurrence and closure from the TCEQ. Although it was not considered to be a REC, they reported a vapor encroachment condition (VEC) associated with affected groundwater underlying a small portion of the Site from the former LPST facility. The following Invasive Screening for Soil Gas was conducted by Koos & Associates, Inc. (KAI) in response to the September 2011 ESA and at the request of Report of Invasive Screening for Soil Gas, 461 West Bethel Road, Coppell, TX Page 2 Mindi Hurley, Economic Development Coordinator with the City of Coppell, 255 Parkway Blvd., Coppell, TX 75019. KAI reviewed the February 2011 ARF and the September 2011 ESA as part of the soil gas screening. KAI conducted Tier 2 Vapor Encroachment Screening (non- invasive) at the Property. KAI utilized the TCEQ's Texas Risk Reduction Program (TRRP) Tier 1 Residential Protective Concentration Levels (PCLs) appropriate for air /inhalation exposure to groundwater vapors ( as presented in 30 TAC Chapter 350 Table 1, dated May 24, 2011. After review of the provided assessment information, and conducting the Tier 2 non - invasive screening along with a risk -based evaluation of the soil and groundwater contaminant concentrations, we did not initially find sufficient evidence to suggest that contaminated groundwater or the overlying contaminated native soil would present a vapor encroachment condition. However, due to uncertainties in the screening process and the presence of utility trenches and other soil disturbances in the area, KAI recommended invasive soil gas sampling. 1.2 Purpose The purpose of the invasive screening for soil gas was to 1) confirm the results of the Tier 2 non - invasive screening and risk -based evaluation, 2) to determine the potential for vapor intrusion in locations where utility trenches (or other soil disturbances) exist or are proposed as these trenches / disturbances are potential preferential pathways for vapor, and 3) to determine if a vapor encroachment condition (VEC) actually exists at the Property. 1.3 Scope of Work Tier 2 invasive screening was performed in general accordance with ASTM E2600- 10, Standard Guide for Vapor Encroachment Screening on Property Involved in Real Estate Transactions, as well as the EPA's Office of Solid Waste and Emergency Response (OSWER) Draft Guidance for Evaluating the Vapor Intrusion to Indoor Air Pathway from Groundwater and Soils (Subsurface Vapor Intrusion Guidance), and the Interstate Technology & Regulatory Council (ITRC) document Vapor Intrusion Pathway: A Practical Guideline. The chosen screening methodology was a subsurface passive diffusion sampling method. This invasive screening was conducted in accordance with the general scope of work as follows: • KAI assessed the Property and marked proposed sampling locations. The grid layout was designed in cooperation with the City of Coppell and their construction inspector to minimize interference with ongoing construction activities in the area. A regular grid sampling pattern was laid out, with 18 samples on approximately 40 -foot centers, which covered an approximate 200- Report of Invasive Screening for Soil Gas, 461 West Bethel Road, Coppell, TX Page 3 foot by 80 -foot area at the north end of the Property, with possible bias for utility corridors. • At least 48 hours prior to commencement of field activities, KAI notified the Texas One -Call /Dig TESS utility line locate service and contacted other utility providers to locate underground utilities in the vicinity of the Property. • KAI emplaced each passive soil gas sampler (GORE Modules) utilizing hand tools, to a depth of approximately three (3) feet in a '/z -inch diameter hole. Sampling locations were temporarily plugged to protect the samplers. • KAI flagged sample locations and left samplers in place in the subsurface and exposed to soil gas for approximately 5 days to allow the samplers to reach a state of equilibrium with the surrounding subsurface environment. • KAI retrieved the samplers and shipped to the Gore Survey Products Group laboratory in Elkton, MD. The samplers were analyzed for VOCs and for total petroleum hydrocarbons (TPH) using EPA method 8260. • A comprehensive report incorporating the Gore laboratory and mapping reports, and including conclusions and recommendations was prepared by KAI. 1.4 Limitations and Exclusions Evaluation of subsurface conditions at the Property is made from a limited number of observation points. Conditions may vary substantially at locations, which are away from the selected sampling points. Recommendations are based on interpretations of current law, and from guidance given by certain state and federal regulatory agency officials. To the extent practical, the accuracy of information obtained has been verified. This report will be for the use of and shall inure to the benefit of the Client. The Client may provide this report to tenants, prospective purchasers, lenders, and similar persons. However, Koos & Associates, Inc. makes no representations or warranties concerning the subject property for the benefit of any such third party. 2. SOIL GAS SCREENING 2.1 General Personnel from KAI conducted invasive screening for soil gas at the Property as follows. On December 23, 2011, eighteen (18) passive soil gas samplers were emplaced on the Property at pre - determined locations in a grid pattern utilizing hand tools, to a depth of approximately three (3) feet in a '/z -inch diameter hole. Sampling locations were temporarily plugged to protect the samplers. On December 28, 2011, KAI personnel returned to the Property to retrieve the samplers and ship them to Gore Survey Products Group laboratory in Elkton, MD. The samplers were analyzed for VOCs and TPH using EPA method 8260. Report of Invasive Screening for Soil Gas, 461 West Bethel Road, Coppell, TX Page 4 2.2 Description of Soil According to a Geotechnical Engineering Report (Terracon, December 2011) provided to KAI by the City of Coppell, specific lithology at the Property consists of approximately one (1) foot of fill and crushed limestone base, or grass and topsoil, depending on location. From approximately 1 foot to 10 feet below ground surface (bgs) is a native soil consisting of dark grey, brown, and light grey clays and sandy clays. From approximately 10 to 20 feet bgs, the soils consist of tan clayey sand and sand. Water was encountered at approximately 18 feet bgs in geotechnical boring B -15, which was located in the immediate vicinity of the soil gas screening area. The samplers were placed at an approximate 3 -foot depth bgs within the clay and sandy clay soil interval. 2.3 Ground Water Characteristics According to the Texas Water Development Board (Aquifers of Texas, Report 345, November 1995), the major and minor ground water reservoirs in this area include the Trinity Group Aquifer and the Woodbine Group Aquifer. KAI reviewed the February 2011 ARF, which was submitted to the TCEQ by W &M as part of the LPST investigation. According to groundwater elevation data in the ARF, the static groundwater elevation is approximately 13 — 16 feet bgs at the Property, and the direction of groundwater flow is to the northeast. 2.4 Sampling Points Eighteen (18) passive soil gas samplers were laid out on approximately 40 -foot centers in a regular three by six grid sampling pattern, which covered an approximate 200 -foot by 80 -foot area at the north end of the Property. This pattern was selected to cover the areas of soil and groundwater contamination noted in the LPST investigation. Please refer to Appendix A — Figure 1: Site Plan with Sample Locations, and Appendix B — Photographs. 2.5 Sampling Procedure A '/2 -inch hammer drill was used to advance each sample boring to an approximate depth of 3 feet bgs. Using the supplied insertion tool, the passive soil gas samplers were inserted into the boring by a technician wearing clean nitrile gloves, which were discarded after every use. Borings were plugged by a supplied cork (which was attached to the sampler by a cord), covered with a bentonite seal, and marked with a survey flag. During retrieval, the samplers were removed from the boring by a technician wearing clean nitrile gloves, which were discarded after every use. The sampler was then placed in a laboratory- supplied glass jar and shipped to the laboratory for analysis. Prior to insertion and retrieval, sampler numbers were cross- checked with the chain -of- custody and entered onto a site map. Report of Invasive Screening for Soil Gas, 461 West Bethel Road, Coppell, TX Page 5 2.6 Laboratory Analysis The sampler "sorbers" (the sampling media) were analyzed for VOCs and TPH using EPA method 8260. Sample analyses were conducted by Gore Survey Products Group laboratory in Elkton, MD. Geotechnical data from the Terracon report was provided to Gore to allow for data to be reported in micrograms per cubic meter (ug/m Selected laboratory results are summarized in the attached Table 1 and were mapped by Gore. The complete laboratory report containing all results is located in Appendix C - Gore Surveys Laboratory Report and Chain of Custody. The maps are included in Appendix D - Gore Surveys Mapping Report. Table 1 Summary Results of Selected Laboratory Analysis - Soil Gas Analysis Sampling Date: December 23 -28, 2011 KAI GORE Benzene BTEX TMBs Naphthalene PCE Sample ID Sample ID (ug/m (ug/m (ug/m (ug/m (ug/m 1 00681697 ND 5.03 ND ND ND 2 00681698 2.96 4.80 ND ND ND 3 00681699 ND 1.60 ND ND ND 4 00681700 ND ND ND ND ND 5 00681701 ND 1.84 ND ND ND 6 00681702 2.32 4.41 ND ND ND 7 00681703 6.87 9.61 BDL 1.40 ND 8 00681704 ND 575.42 934.41 129.78 7.08 9 00681705 2.59 9.61 7.08 ND ND 10 00681706 ND 6.05 15.96 11.69 ND 11 00681707 2.86 5.52 ND ND ND 12 00681708 ND 743.47 1.26 ND 11.19 13 00681709 ND 1.37 ND 4.49 ND 14 00681710 ND 1.29 ND ND ND 15 00681711 ND 1.29 ND ND ND 16 00681712 ND 1.38 ND ND ND 17 00681713 ND 25.86 0.98 ND ND 18 00681714 ND 2.59 ND ND ND Target Screening Level NA - See 60* - with Risk = 1x10 -6 3.1 Below See Below 30 8.1 Target Screening Level NA - See 60* - with Risk = 1x10 -4 310 Below See Below 30 810 NOTES:Bolded concentrations exceed the 1x10 -6 risk. Shaded concentrations also exceed the lx10 BTEX = Benzene, Toluene, Ethylbenzene, and Total Xylenes; TMBs = 1,2,4 - Trimethylbenzene and 1,3,5- Trimethylbenzene; PCE = Tetrachloroethylene * See TMBs discussed below Report of Invasive Screening for Soil Gas, 461 West Bethel Road, Coppell, TX Page 6 2.7 Discussion of Results When reviewing Table 1, note that the "Target Screening Level" is the "Target Shallow Gas Concentration Corresponding to Target Indoor Air Concentration Where the Soil Gas to Indoor Air Attenuation Factor is 0.1". This attenuation factor is appropriate for estimating shallow soil gas moving through soil and then through a poured concrete foundation. These screening levels are from Tables 2a (Risk = 1x10 -6 ) and 2c (Risk = 1x10 in the EPA's OSWER Draft Guidance for Evaluating the Vapor Intrusion to Indoor Air Pathway from Groundwater and Soils (Subsurface Vapor Intrusion Guidance), November 2002, EPA530 -D -02 -004. This guidance provides targeted indoor air concentrations set at 10 10 -5 , and 10 (incremental individual lifetime cancer risk) levels and a Hazard Quotient (HQ) of 1 for non - cancer risk. Risk level 1x10 is the most conservative cancer risk level. Note that naphthalene and the trimethylbenzenes (TMBs) have HQ =1 for non - cancer risk therefore, the screening levels remain constant. BTEX does not have a Target Screening Level because this concentration is a sum of the benzene, toluene, ethylbenzene, and total xylenes concentrations, which all have different individual screening levels. "TMBs" does not have a screening level, however, 1,2,4 - trimethylbenzene and 1,3,5 - trimethylbenzene each have an individual screening level of 60 mg /m so the screening level of 60 mg /m is being utilized as a reference for TMBs. Additional individual concentrations can be found in Appendix C - Gore Surveys Laboratory Report and Chain of Custody. This EPA guidance is primarily designed for residential use assessment, however, it can also be used for a conservative commercial use assessment. Gore sample #681704 Based on the results of the invasive screening for soil gas at the Property, naphthalene, 1,2,4 - trimethylbenzene and 1,3,5 - trimethylbenzene at Gore sample location #681704 were found to exceed both the Risk = 1x10 -6 and the Risk = 1x10 Target Screening Levels. The BTEX soil gas concentration is also high but that concentration is due to high xylene concentrations, which do not exceed the individual xylene Target Screening Levels. Based on the two proposed building locations provided to KAI, naphthalene, 1,2,4 - trimethylbenzene and 1,3,5 - trimethylbenzene concentrations are located within the two proposed building footprint options and therefore pose an indoor air quality risk. No other chemical concentrations above the screening levels were noted at this sampling location. Please refer to Appendix A — Figure 2: Site Plan with Approximate Cottage C -1 Footprint, Figure 3: Site Plan with Approximate Alternate Cottage Footprints, and Appendix D - Gore Surveys Mapping Report for a depiction of the approximate building footprints with respect to the sample locations and soil gas concentrations. Report of Invasive Screening for Soil Gas, 461 West Bethel Road, Coppell, TX Page 7 Gore sample #681703 Based on the results of the invasive screening for soil gas at the Property, benzene at Gore sample location #681703 was found to exceed the Target Screening Level with the more conservative Risk = 1x10 -6 , but was below the Target Screening Level with Risk = 1x10 " The TPH soil gas concentration is also high but does not have a Target Screening Level. However, based on the two proposed building locations provided to KAI, these benzene and TPH concentrations are not located in the proposed footprint of a building and therefore would not pose an indoor air quality risk. No other chemical concentrations above the screening levels were noted at this sampling location. Please refer to Appendix A — Figure 2: Site Plan with Approximate Cottage C -1 Footprint, Figure 3: Site Plan with Approximate Alternate Cottage Footprints, and Appendix D - Gore Surveys Mapping Report. Gore sample #681708 Based on the results of the invasive screening for soil gas at the Property, tetrachloroethylene (PCE) at Gore sample location #681708 was found to exceed the Target Screening Level with the more conservative Risk = 1x10 -6 , but was below the Target Screening Level with Risk = 1x10 -4 . The BTEX soil gas concentration is also high but that concentration is due to a high toluene concentration, which does not exceed the individual toluene Target Screening Level. However, based on the two proposed building locations provided to KAI, these PCE and BTEX concentrations are not located in the proposed footprint of a building and would therefore would not pose an indoor air quality risk. No other chemical concentrations above the screening levels were noted at this sampling location. Please refer to Appendix A — Figure 2: Site Plan with Approximate Cottage C -1 Footprint, Figure 3: Site Plan with Approximate Alternate Cottage Footprints, and Appendix D - Gore Surveys Mapping Report. All Other Samples No other chemical concentrations were noted above either screening level at any of the other sampling locations. Please refer to Appendix A — Figure 2: Site Plan with Approximate Cottage C -1 Footprint, Figure 3: Site Plan with Approximate Alternate Cottage Footprints, and Appendix D - Gore Surveys Mapping Report. 3. CONCLUSIONS and RECOMMENDATIONS 3.1 Conclusions Results of the invasive Tier 2 Vapor Encroachment Screening indicate that a VEC exists. Based on the two proposed building locations provided to KAI, naphthalene, 1,2,4 - trimethylbenzene and 1,3,5 - trimethylbenzene concentrations are located within the two proposed building footprint options and therefore pose an indoor air quality risk. Report of Invasive Screening for Soil Gas, 461 West Bethel Road, Coppell, TX Page 8 3.2 Recommendations Based upon the identified naphthalene, 1,2,4 - trimethylbenzene and 1,3,5 - trimethylbenzene exceedences, KAI proposes that a preventative approach be implemented as follows: 1) Design and installation of a vapor barrier beneath the foundation of the affected building to block or reduce the migration of the constituents of concern (naphthalene, 1,2,4 - trimethylbenzene and 1,3,5 - trimethylbenzene) into the overlying structure. Particular attention should be paid to the proper sealing of penetrations. 2) Ensure that the design of the heating, ventilation, and air conditioning (HVAC) system provides for adequate ventilation in accordance with American Society of Heating, Refrigerating, and Air Conditioning Engineers (ASHRAE) guidelines. • a - APPENDIX A 0 z S To e) Z in " N (0 � N 7 o O 0 0 2 Jo �I' 0 0 0 ______X • --- - - co .._ 1 , Vic, W ii , -0 0 , (/) ii i 0 O � � (/) a) I -- - 1. Q �� co co N. I 0 0 1 I =X I E I I wm_ _____=17) - a 0, O c — — — 4 ,- 0 r --- 1 . _ •� —a U 0 � W ■ co n ,1 IM O C n. c O co co (n I� CD (/� 0 0 0 1 I T — 1� O .� I 0 al Q o B o .� i ^ J w w 0 11 na un aa� uie / E M �' P ) �S w or `"- L--- C!) 41',. co 3 • al I - - — — — — r a W 0 U (ID io q To' co N N I . 0 g ti U O y O) Q � FN v t1 N 0 N -H OO c0 4., Y — ❑ O Z o To to c F Z _ I " _--. X .., • `J 1 ... _._ w r (n • — — — ��` I i��, z ct Lc II Q f` / -I I J -c X co Sao a N I— I I I woo — 1 -53 o 1 �, 1 1 G 1 ---- j - A I m 16') u o co I CA ° 1 I co co co co , O -r-I al - iz • `—' r N w ( napun) pails then I IN- ao •v Ci co. • (D• N 111 1 if ca -0 al I — — - - - - .-1 c_.) , 0 r 1 1 0 (I) Lo CC U "2 H F El 1 0 0 cr N 0 co I �-I f0 C N Cal p . u) m 2 35 0 �— ca 'el -r1 0 3 Y °0 CL.1 0 z o `° Z u N N O N 7 - 1 ) 1:V 11 ci) I \ -a 0 !rl[ O 0 CO it II x — — .—, .__, co ■ 1 / • x N. ___ — ti W (24) -, - e-) N. f 17 5 o_ co CO M O O O Lo �• •� Oir •� - (/) I O r -0 (/) C"r 00 O O - - ,, -r-I N. L N. al �� i 9pUfl)180.T3 - 1 ° thew i ° op • _ 4- 11 ,' "O• (i . L----I \ C7) air -0 al I U J a) a te ) O -1--) ni 1 0 0 II N 1 mgr- r 1 C1, o `o m ,- °6 O Vi 01 4 N� m -r-1 - . - I p p (0 w 3 YN- o APPENDIX B Report of Invasive Screening for Soil Gas, 461 West Bethel Road, Coppell, TX k R` +. R t c, -, *At.""0 -x' iii« 1. View of the Property facing southeast from 2. View of the central portion of Property facing the northw / / est corner. north with W. Bethel Rd. in the background. ' , , �), i « „ r , x - we R —1------ Am g 3. View of sampling locations looking west with 4. View of sampling locations on the east portion W. Bethel Road on the right. of the Property looking north. f f 5. View of sampling locations looking east from 6. View of sampling locations on the west NW corner of the sampling grid. portion of the Property looking SSE. APPENDIX C i °RE GORE®Surveys FOR ENVIRONMENTAL Laboratory Report Site: Former Coppell Auto Center Prepared for: KOOS AND ASSOCIATES, INC. 10410 MARKISON ROAD DALLAS, TX UNITED STATES Prepared on: January 27, 2012 Gore Production Order Number: ENV 21427232 © 2012 W. L. Gore & Associates, Inc. \SPG 21427232 January 27, 2012 Page 1 of 26 EOR GORE® Survey - Laboratory Report Project Summary and Objective W. L. Gore & Associates, Inc. (Gore) provided the GORE Survey (Survey) used at: Former Coppell Auto Center The service provided by Gore to meet this objective included delivery of the required quantity of GORE Modules, analysis by the method described below for the requested organic compounds, reporting of the data, and contour mapping (as needed). If contour maps are part of the project deliverable, the maps will be prepared and issued under a separate report cover, upon receipt of a usable sitemap (electronic) and compound choices for contouring. Written /submitted by: Jay W Hodny Project Manager Reviewed /approved by: Dayna M Cobb Project Manager Analytical data approved by: Don D'Apolito Chemist © 2012 W. L. Gore & Associates, Inc. \SPG _ Envirofinal 21427232 January 27, 2012 Page 2 of 26 arROr GORE® Survey - Laboratory Report Field Sampling and Reconciliation Summary Field work performed by KOOS AND ASSOCIATES, INC. Total # shipped: 20 # Deployed: 18 # Retrieved: 18 # Designated lost: ' 0 # Returned unused 0 # Not returned: 0 # Trip blanks: 2 Total # reconciled 20 Survey period 2 All of the GORE Modules were installed on December 23, 2011, and retrieved on December 28, 2011. Exposure period was approximately five days. Tamper seal integrity: No Date received: 1/6/2012 7:14:08AM By: Scott Kirlin COC returned: Yes Comments: None. 1 - Noted on the installation log as installed but lost, damaged, or similar, and not returned. 2 - Installation start to end of retrieval, as reported. See installation and retrieval log for individual deployment and retrieval dates and times (i.e., sampler exposure time). © 2012 W. L. Gore & Associates, Inc. \sPG_Envirofinai 21427232 January 27, 2012 Page 3 of 26 r r w GORE® Survey - Laboratory Report a. Quality Assurance Statement The Survey Products Group laboratory, at W. L. Gore & Associates' facility in Elkton, MD USA, operates under the guidelines of it's ISO Standard 17025 DoD ELAP accreditation, and its Quality Assurance Manual, Operating Procedures, and Methods (SPG- SOP - 0462). For this project, the analytical method, results, and observations reported do [ ] do not [ I ] fall within the scope of W. L. Gore's ISO 17025 accreditation. Screening /Concentration Method The GORE® Modules are analyzed at Gore's fixed laboratory using thermal desorption -gas chromatography /mass spectrometry (TD- GC /MS) instrumentation following U.S. EPA Method 8260 (SPG -WI- 0292), and include the following: • BFB Tuning Frequency: A BFB tune is analyzed at the start of each analytical run and after every 30 samples. • Initial Calibration: A minimum of a five point calibration curve is analyzed prior to the analysis of samples. • Linearity of Target Compounds: If the RSD of any target analyte is less than or equal to 25% then average response factor can be used for quantitation. If the RSD exceeds 25% for a target compound a regression equation can be used for quantitation. • Continuing Calibration Verification: After every 10 samples, and at the end of each analytical batch, and a second - source Reference Standard is analyzed near the mid point of the calibration curve. The acceptance criteria for all target analytes in the reference standards are +/- 50% of the true value. • Method Blank: Analyzed prior to the analysis of field samples and every 30 samples. Note: Analyte levels reported for the field- deployed GORE® Modules that exceed trip and method blank levels, and /or method detection limit, are more likely to have originated from on -site sources. Media Sampled: SOILGAS Chemist - sample analysis: Kelly J Stringham Chemist - data processor: Kelly J Stringham Chemist - data review: Don D'Apolito Method deviations: None. © 2012 W. L. Gore & Associates, Inc. \SPG_Envirofinal 21427232 January 27, 2012 Page 4 of 26 Liiii GORE® Survey - Laboratory Report Additional Report Information - Comments - Laboratory Sample Report - Chain of Custody - Installation and Retrieval Log - Concentration Calculation Method Summary (as applicable) - Ion Chromatograms Project Specific Comments None. © 2012 W. L. Gore & Associates, Inc. \SPG_Envirofinal 21427232 January 27, 2012 Page 5 of 26 - dor GORE® Survey - Laboratory Report General Comments Analytical QA/QC Laboratory instrumentation consists of state of the art gas chromatographs equipped with mass selective detectors, coupled with automated thermal desorption units. Sample preparation involves cutting the tip off the bottom of the GORE Module, and transferring one or more " sorbers" to a thermal desorption tube for analysis. The insertion /retrieval cord prevents soil, water and other interferences from coming in contact with the adsorbent. No further sample preparation is required. Any replicate sorbers not consumed in the initial analysis will be discarded fifteen (15) days from the date of the laboratory report. Data are archived and stored in a secure manner as per Gore's Quality Assurance program (SPG -SOP- 0462). Total petroleum hydrocarbons (TPH), gasoline -range petroleum hydrocarbons (GRPH), and /or diesel range petroleum hydrocarbons (DRPH), when reported, are calculated using the area under the peaks observed in m/z 55 and 57 selected ion chromatograms. Quantitation of the mass values was performed using the response factor for a specific alkane (present in the calibration standards). TPH values include the entire chromatogram and provide estimates for aliphatic hydrocarbon ranges of C4 to C20. GRPH and DRPH include only the relevant regions of the chromatograms and provide estimates for C4 to C10 and C10 to C20 aliphatic hydrocarbons, respectively. Trip blanks were provided to document potential exposures there were not part of the signal of interest (e.g., impact during sampler shipment, installation and /or retrieval, and storage). The trip blanks are identically manufactured and packaged GORE Modules to those modules deployed in the field. The trip blanks remain unopened during all phases of the project. Levels reported on the trip blanks may indicate potential impact to the modules other than the contaminant source of interest. Unresolved peak envelopes (UPEs) are represented as a series of compound peaks clustered together around a central gas chromatograph elution time in the total ion chromatogram. UPEs may be indicative of complex fluid mixtures. UPEs observed early in the chromatograms are considered to indicate presence of more volatile fluids, while UPEs observed later in the chromatogram may indicate the presence of less volatile fluids. Multiple UPEs may indicate the presence of multiple complex fluids. Stacked total ion chromatograms (TICs) are included in the Attachments. The six -digit serial number of each module is incorporated in the TIC identification (e.g., 123456S.D represents GORE Module 123456). © 2012 W. L. Gore & Associates, Inc. \SPG_Envirofinal 21427232 January 27, 2012 Page 6 of 26 GORE® Survey - Laboratory Report Itta leketa General Comments Soil Gas Sampling For soil gas sampling, the GORE Survey reports mass levels migrating through the open pore spaces of the soil and diffusing through the sampler membrane for sorption by the engineered, hydrophobic adsorbents, housed within the membrane tube. During the migration of the soil gas away from the source to the GORE Module, the vapors are subject to a variety of attenuation factors. The soil gas masses reported on the modules compare favorably with the concentrations reported in the soil or groundwater (e.g., where soil gas levels are reported at greater levels to other sampled locations on the site, the matrix data should reveal the same pattern, and vice versa). However, due to a variety of factors, a perfect comparison between matrix data and soil gas levels can rarely be achieved. Soil gas concentrations (ug /m3) are calculated following the method described in the Laboratory Report Attachments. Soil gas signals reported by this method cannot be correlated specifically to soil adsorbed, groundwater, and/ or free -phase contamination. The soil gas signal reported from each GORE Module can evolve from all of these sources. Differentation between soil and groundwater contamination can only be achieved with prior knowledge of the site history (i.e., the site is known to have groundwater contamination only). Air Sampling For indoor, outdoor, and crawlspace air sampling, the GORE Survey reports mass levels present in the air and diffusing through the sampler membrane for sorption by the engineered adsorbents housed within the membrane tube. Air concentrations (ug /m3) are calculated following the method described in the Laboratory Report Attachments. Groundwater and Sediment Porewater Sampling For groundwater and sediment porewater sampling, the GORE Survey reports the mass levels of compounds present in the water which, when coming in contact with the sampler membrane, partitions our of solution, and diffuses through the sampler membrane for sorption by the engineered adsorbents. Water concentrations (ug /L) are calculated using the quantified mass, exposure period, compound specific uptake rate. The rates were measured under controlled experimental conditions. The uptake rates are corrected for water pressure (depth of the GORE Module below the water table and water temperature, and when the aquifer flow rate is > 10m /day. © 2012 W. L. Gore & Associates, Inc. \SPG_Envirofinal 21427232 January 27, 2012 Page 7 of 26 aff GORE® Survey - Laboratory Report LABORATORY SAMPLE REPORT Project: ENV 21427232 Site Name: Former Coppell Auto Center Module Type: SPG0008 Module ID Sample Type Field ID 00681697 FIELD_SAMPLE 1.0 00681698 FIELD_SAMPLE 2.0 00681699 FIELD_SAMPLE 3.0 00681700 FIELD_SAMPLE 4.0 00681701 FIELD_SAMPLE 5.0 00681702 FIELD_SAMPLE 6.0 00681703 FIELD_SAMPLE 7.0 00681704 FIELD_SAMPLE 8.0 00681705 FIELD_SAMPLE 9.0 00681706 FIELD_SAMPLE 10.0 00681707 FIELD_SAMPLE 11.0 00681708 FIELD_SAMPLE 12.0 00681709 FIELD_SAMPLE 13.0 00681710 FIELD_SAMPLE 14.0 00681711 FIELD_SAMPLE 15.0 00681712 FIELD_SAMPLE 16.0 00681713 FIELD_SAMPLE 17.0 00681714 FIELD SAMPLE 18.0 00681715 TRIP__BLANK Not Provided 00681716 TRIP BLANK Not Provided Total # Total # Total # Total # "FIELD SAMPLES" "TRIP BLANKS" "UNUSED" "LOST" 18 2 0 0 © 2012 W. L. Gore & Associates, Inc. \SPG_Envirofinal 21427232 January 27, 2012 Page 8 of 26 --- - -- -- - - - - -__- - - - ---- � r I • GO.RErM Screening Survey Chain of Custody For W.L. Gore & Associates use only Production Order # 21427232. GORE 4 ---g.-..r.- W. L. Gore & Associates, Inc., Survey Products Group 100 Chesapeake Boulevard • Elkton, Maryland 21921 • Tel- (410) 392 -7600 • Fax (410) 506 -4780 Instructions: Customer must complete ALL shaded cells Customer Name: KOOS AND ASSOCIATES INC Site Name: FORMER COPPELL AUTO CENTER Address: 10410 MARKISON ROAD Site Address: DALLAS TX 75238 Project Manager: VALERIE HONEYCUTT Phone: _ 214 341 5377 Customer Project No.: 16175041 FAX: Customer P.O. #: Quote #: Serial # of Modules Shipped It of Modules for Installation To r # of Trip Blanks # 681697 - # 681716 # - # Total Modules Shipped: 20 Pieces # - # # - # Total Modules Received ` �,. � - Pieces - # - # # - # Total Modules Installed: 10 . Pieces # - # # - # Serial # of Trip 131anks (Client Decides) # - OD017S # - # # - # # 00000i11 h It # # -# # -# It # # # - # # - # if # # # -# # -# # # # # - # # - # # # # Prepared By —j # # # __ .6- Verified By: A� _ 110r # # # Installation Performe 4 By n A i, Installation Method(s) (circle those that apply): (please print): W eiie att ' b I it Nartle lease rint : � I<o6� Slide Hammer Hammer Drill Auger Company /Affiliation : 1 q licssocAme Other _ Installation Start Date and Time 1 a-- / )_ 3 / 10 it t : 9-5 AM MI ' — Installation _Complete Date-and .Time: 1 _ / 1-- / zo l I i • : 15 AM ( P print): y. - Name Retrieval Performed Total MaduIes Retrieved: 1 r.1 Pieces. lease rint : \J ( ne- NMI V b } 1� S Tota Mo Lost in _ Pieces Company /Afliation :1 16PS ee 55(Lt0tiC5 -_ _ , Total Unused Modules Returned: Pieces I. Retrieval Start Date and Time: �Q :4 5 AM PM (� / �-$ / f-v 11 is Retrieval Complete Date and Time 1)- / 2-6 / /611 : 4 1,91 PM Relinquished By fir -= Date Time Received B • • fi AL'. , j Date Time Affiliation: W.L. Gore & sociates, Inc. ''S-N '''1'°'" Affiliation. . ' t►ti� D i ' ..t - iVkl1 19 1 Relinquished By 1 . . AMA .4 .. v Date Time Received By Date Time • Affiliation: 15 0 ' r j'4 -12- 15t0 Affiliation: Relinquished By Date Time Received By .f Date Time Affiliation Affiliation: W.L. Gore & Associates, Inc. /4.- 7.1 ° SPG -FCD -0298 March 12, 2010 C RE is a trademark of W.L. Gore & Associates, Inc. I' 21427232 January 27, 2012 Page 9 of �� W. L. Gore & Associates, Inc. 100 Chesapeake Boulevard GORE Project No: ENV 21427232 Ma�oMxw Elkton, MD USA 21921 Site Name: Former Coppell Auto Center ph: 410 - 392 -7600 Site Location: 461 Bethel Road, Coppell, TX 75019 GORE Surveys Company Name: KOOS AND ASSOCIATES, INC. Installation & Retrieval Log Location: 10410 Markison Road, Dallas, TX 75238 -1650 Samples collected by: Don Koos and Valerie Honeycutt ' Optional or as needed SAMPLE TYPE INSTALLATION DATE & EVIDENCE OF FIELD ID` (e.g., RETRIEVAL DATE & TIME OBSERVATIONS /COMMENTS' (e.g., sample depth, location description, missing, pulled SAMPLE ENVIRONMENT* (e.g., LIQUID MODULE arbitrary, US (Field Sample, Trip TIME MM /DD/YYYY MM /DD /YYYY HH:MM (24 from hole, etc. - as needed) grass, bare soil, through slab) PETROLEUM SERIAL NO. EPA) Blank, Field Blank, HH:MM (24 Hour) ex. Hour) ex. 12/30/2000 13:00 HYDROCARBONS etc.) 12/27/2000 13:00 00681697 1 FIELD SAMPLE 12/23/2011 12:25 12/28/2011 11:40 2' depth, grass at ditch grass No 00681698 2 FIELD SAMPLE 12/23/2011 12:33 12/28/2011 11:38 2' depth, gravel parking area crushed limestone base to 1' No 00681699 3 FIELD SAMPLE 12/23/2011 12:36 12/28/2011 11:36 2' depth, gravel parking area crushed limestone base to 1' No 00681700 4 FIELD SAMPLE 12/23/2011 12:38 12/28/2011 11:10 2' depth, grass at ditch grass No 00681701 5 FIELD SAMPLE 12/23/2011 12:41 12/28/2011 11:34 2' depth, gravel parking area crushed limestone base to 1' No 00681702 6 FIELD SAMPLE 12/23/2011 12:46 12/28/2011 11:35 2' depth, gravel parking area crushed limestone base to 1' No 00681703 7 FIELD SAMPLE 12/23/2011 12:50 12/28/2011 11:04 2' depth, graded construction area, compacted gravel, at edge of road crushed limestone base to 1' No 00681704 8 FIELD SAMPLE 12/23/2011 12:52 12/28/2011 11:06 2' depth, graded construction area, dirt bare soil No 00681705 9 FIELD SAMPLE 12/23/2011 12:55 12/28/2011 11:08 2' depth, graded construction area, dirt bare soil No 00681706 10 FIELD SAMPLE 12/23/2011 12:56 12/28/2011 11:02 2' depth, graded construction area, dirt, at edge of road, near signal pole island bare soil No 00681707 11 FIELD SAMPLE 12/23/2011 12:58 12/28/2011 10:59 2' depth, graded construction area, dirt bare soil No 00681708 12 FIELD SAMPLE 12/23/2011 13:00 12/28/2011 10:57 2' depth, graded construction area, dirt bare soil No 00681709 13 FIELD SAMPLE 12/23/2011 13:02 12/28/2011 10:50 2' depth, graded construction area, dirt, near road intersection bare soil No 00681710 14 FIELD SAMPLE 12/23/2011 13:04 12/28/2011 10:52 2' depth, graded construction area, dirt, near road under construction bare soil No 00681711 15 FIELD SAMPLE 12/23/2011 13:06 12/28/2011 10:55 2' depth, graded construction area, dirt, near road under construction at excavation bare soil No 00681712 16 FIELD SAMPLE 12/23/2011 13:09 12/28/2011 10:49 2' depth, graded construction area, dirt, near road intersection at signal pole bare soil No 00681713 17 FIELD SAMPLE 12/23/2011 13:13 12/28/2011 11:25 2' depth, graded construction area, dirt, near road under construction at dirt pile bare soil No 00681714 18 FIELD SAMPLE 12/23/2011 13:15 12/28/2011 10:45 2' depth, graded construction area, dirt, near road under construction bare soil No 00681715 TRIP BLANK 00681716 TRIP BLANK cone ma onaa ae.mnn,m, o, w. . aoid n„Wam,. mi GPG-FC0d927 Goo Gas - Mar 27. 2011 21427232 January 27, 2012 Page 10 of 26 GORE Surve■ Installation & R " Optional or at YES / NO AT MINIMUM PROVIDE SOIL TYPE SOIL TYPE AT WATER IN TOTAL SOIL POROSITY AT WATER FILLED SOIL POROSITY AT LATITUDE COORDINATE COORDINATE MODULE MODULE DEPTH LONGITUDE SERIAL NO. ODOR 7 INSTALLATION MODULE DEPTH' (total volume of MODULE DEPTH* (volume of (northing) or SYSTEM* (e.g., UTM DATUM* (e.g., HOLE? (clay, loamy sand pores /total volume) water /volume of pores) feasting) or X Y Zone, Stateplane, etc.) WGS 84) etc.) 00681697 No No Fat Clay (CH) See aatached boring log 6 -15 See aatached boring log 8-15 00681698 No No Fat Clay (CH) See aatached boring log B -15 See aatached boring log B -15 00681699 No No Fat Clay (CH) See aatached boring log B -15 See aatached boring log B -15 00681700 No No Fat Clay (CH) See aatached boring log B -15 See aatached boring log B -15 00681701 No No Fat Clay (CH) See aatached boring log B -15 See aatached boring log 6 -15 00681702 No No Fat Clay (CH) See aatached boring log B -15 See aatached boring log B -15 00681703 No No Fat Clay (CH) See aatached boring log B -15 See aatached boring log 6 -15 00681704 No No Fat Clay (CH) See aatached boring log B -15 See aatached boring log B -15 00681705 No No Fat Clay (CH) See aatached boring log B -15 See aatached boring log 8 -15 00681706 No Yes Fat Clay (CH) See aatached boring log B -15 See aatached boring log B -15 00681707 No No Fat Clay (CH) See aatached boring log B -15 See aatached boring log B -15 00681708 No No Fat Clay (CH) See aatached boring log B -15 See aatached boring log B -15 00681709 No No Fat Clay (CH) See aatached boring log 8 -15 See aatached boring log B -15 00681710 No No Fat Clay (CH) See aatached boring log B -15 See aatached boring log B -15 00681711 No No Fat Clay (CH) See aatached boring log 6 -15 See aatached boring log 8 -15 00681712 No No Fat Clay (CH) See aatached boring log 6-15 See aatached boring log B -15 00681713 No No Fat Clay (CH) See aatached boring log B -15 See aatached boring log B -15 00681714 No No Fat Clay (CH) See aatached boring log B -15 See aatached boring log B -15 00681715 00681716 GORE ante eamas are trademarks of W. a Gona associates, km SPGFCDd92I Sail Gas • May 27, 3011 21427232 January 27, 2012 Page 11 of 26 GORE(TM) SURVEYS ANALYTICAL RESULTS KOOS AND ASSOCIATES, INC., DALLAS, TX GORE STANDARD TARGET VOCs/SVOCs (A1) FORMER COPPELL AUTO CENTER, COPPELL, TX SITE GHZ - PRODUCTION ORDER #21427232 DATE SAMPLE ANALYZED NAME TPH, ug BTEX, ug BENZ, ug TOL, ug EtBENZ, ug mpXYL, ug oXYL, ug C11, C13, &C15, ug UNDEC, ug MDL= 0.02 0.01 0.01 0.02 0.02 0.01 0.01 01/12/12 681697 0.98 0.06 nd 0.06 nd nd nd bdl bdl 01/11/12 681698 1.37 0.05 0.02 0.02 nd nd nd bdl bdI 01/12/12 681699 1.46 0.02 nd 0.02 nd nd nd bdl bdI 01/12/12 681700 0.36 nd nd nd nd nd nd bdl nd 01/11/12 681701 1.09 0.02 nd 0.02 nd nd nd bdl bdI 01/11/12 681702 3.16 0.04 0.02 0.03 nd nd bdl 0.05 0.01 01/11/12 681703 59.92 0.09 0.05 0.03 bdI bdl nd bdl bdI 01/11/12 681704 23.86 8.03 nd 0.21 0.24 4.85 2.74 1.17 0.67 01/11/12 681705 1.23 0.11 0.02 0.05 bdI 0.03 0.02 bdl nd 01/11/12 681706 11.29 0.09 nd nd 0.02 0.04 0.02 nd nd 01/11/12 681707 3.26 0.06 0.02 0.03 nd nd nd 0.01 bdI 01/11/12 681708 9.81 9.24 nd 8.98 0.04 0.15 0.06 bdI nd 01/12/12 681709 3.37 0.02 nd 0.02 nd bdl nd nd nd 01/11/12 681710 1.44 0.02 nd 0.02 nd nd nd 0.01 0.01 01/11/12 681711 0.66 0.02 nd 0.02 nd nd nd bdI bdI 01/12/12 681712 1.63 0.02 nd 0.02 nd nd nd bdl nd 01/12/12 681713 1.84 0.33 nd 0.29 nd 0.02 0.01 0.01 0.01 01/12/12 681714 0.89 0.03 nd 0.03 nd nd nd bdl bdI 01/11/12 681715 0.02 nd nd nd nd nd nd nd nd 01/12/12 681716 0.03 nd nd nd nd nd nd nd nd 01/11/12 method blank nd nd nd nd nd nd nd nd nd No mdl is available for summed combinations of analytes. In summed 1/27/2012 columns (eg., BTEX), the reported values should be considered Page: 1 of 4 ESTIMATED if any of the individual compounds were reported as bdl. GHZcust.xls 21427232 January 27, 2012 Page 12 of 26 GORE(TM) SURVEYS ANALYTICAL RESULTS KOOS AND ASSOCIATES, INC., DALLAS, TX GORE STANDARD TARGET VOCs/SVOCs (A1) FORMER COPPELL AUTO CENTER, COPPELL, TX SITE GHZ - PRODUCTION ORDER #21427232 SAMPLE NAME TRIDEC, ug PENTADEC, ug TMBs, ug 124TMB, ug 135TMB, ug ct12DCE, ug t12DCE, ug c12DCE, ug NAPH &2 -MN, ug MDL= 0.01 0.01 0.01 0.02 0.05 0.02 681697 nd nd nd nd nd nd nd nd nd 681698 nd nd nd nd nd nd nd nd nd 681699 nd nd nd nd nd nd nd nd nd 681700 nd bdl nd nd nd nd nd nd nd 681701 nd nd nd nd nd nd nd nd nd 681702 0.02 0.02 nd nd nd nd nd nd bdl 681703 nd nd bdl bdI nd nd nd nd 0.02 681704 0.44 0.06 13.02 9.78 3.24 nd nd nd 3.18 681705 nd bdl 0.10 0.07 0.03 nd nd nd bdl 681706 nd nd 0.22 0.18 0.05 nd nd nd 0.20 681707 0.01 nd nd nd nd nd nd nd nd 681708 nd bdl 0.02 0.02 bdl nd nd nd bdl 681709 nd nd nd nd nd nd nd nd 0.10 681710 nd nd nd nd nd nd nd nd nd 681711 nd nd nd nd nd nd nd nd bdl 681712 bdl bdl nd nd nd nd nd nd nd 681713 nd bdl 0.01 0.01 bdI nd nd nd nd 681714 nd nd nd nd nd nd nd nd nd 681715 nd nd nd nd nd nd nd nd nd 681716 nd nd nd nd nd nd nd nd nd method blank nd nd nd nd nd nd nd nd nd No mdl is available for summed combinations of analytes. In summed 1/27/2012 columns (eg., BTEX), the reported values should be considered Page: 2 of 4 ESTIMATED if any of the individual compounds were reported as bdl. GHZcust.xls 21427232 January 27, 2012 Page 13 of 26 GORE(TM) SURVEYS ANALYTICAL RESULTS KOOS AND ASSOCIATES, INC., DALLAS, TX GORE STANDARD TARGET VOCs/SVOCs (Al) FORMER COPPELL AUTO CENTER, COPPELL, TX SITE GHZ - PRODUCTION ORDER #21427232 SAMPLE NAME NAPH, ug 2MeNAPH, ug MTBE, ug 11DCA, ug CHCI3, ug 111TCA, ug 12DCA, ug TCE, ug OCT, ug PCE, ug 14DCB, ug MDL= 0.01 0.01 0.03 0.02 0.01 0.01 0.01 0.02 0.02 0.02 0.01 681697 nd nd nd nd nd nd nd nd nd nd nd 681698 nd nd nd nd nd nd nd nd nd nd nd 681699 nd nd nd nd nd nd nd nd nd nd nd 681700 nd nd nd nd nd nd nd nd nd nd nd 681701 nd nd nd nd nd nd nd nd nd nd nd 681702 nd bdl nd nd nd nd nd nd bdl nd nd 681703 0.02 nd nd nd nd nd nd nd nd nd nd 681704 1.86 1.33 nd nd nd nd nd nd 0.06 0.09 bdl 681705 nd bdl nd nd nd nd nd nd bdl nd nd 681706 0.17 0.03 0.38 nd nd nd nd nd nd nd nd 681707 nd nd nd nd nd nd nd nd nd nd nd 681708 nd bdl nd nd nd nd nd nd 0.05 0.13 nd 681709 0.06 0.03 nd nd nd nd nd nd nd nd nd 681710 nd nd nd nd nd nd nd nd nd nd nd 681711 nd bdl nd nd nd nd nd nd nd nd nd 681712 nd nd nd nd nd nd nd nd nd nd nd 681713 nd nd nd nd 0.13 nd nd nd nd nd nd 681714 nd nd nd nd nd nd nd nd nd nd nd 681715 nd nd nd nd nd nd nd nd nd nd nd 681716 nd nd nd nd nd nd nd nd nd nd nd method blank nd nd nd nd nd nd nd nd nd nd nd No mdl is available for summed combinations of analytes. In summed 1/27/2012 columns (eg., BTEX), the reported values should be considered Page: 3 of 4 ESTIMATED if any of the individual compounds were reported as bdl. GHZcust.xls 21427232 January 27, 2012 Page 14 of 26 GORE(TM) SURVEYS ANALYTICAL RESULTS KOOS AND ASSOCIATES, INC., DALLAS, TX GORE STANDARD TARGET VOCs/SVOCs (A1) FORMER COPPELL AUTO CENTER, COPPELL, TX SITE GHZ - PRODUCTION ORDER #21427232 SAMPLE NAME CCI4, ug 112TCA, ug CIBENZ, ug 1112TetCA, ug 1122TetCA, ug 13DCB, ug 12DCB, ug MDL= 0.03 0.02 0.03 0.02 0.01 0.01 0.01 681697 nd nd nd nd nd nd nd 681698 nd nd nd nd nd nd nd 681699 nd nd nd nd nd nd nd 681700 nd nd nd nd nd nd nd 681701 nd nd nd nd nd nd nd 681702 nd nd nd nd nd nd nd 681703 nd nd nd nd nd nd nd 681704 nd nd nd nd nd nd nd 681705 nd nd nd nd nd nd nd 681706 nd nd nd nd nd nd nd 681707 nd nd nd nd nd nd nd 681708 nd nd nd nd nd nd nd 681709 nd nd nd nd nd nd nd 681710 nd nd nd nd nd nd nd 681711 nd nd nd nd nd nd nd 681712 nd nd nd nd nd nd nd 681713 nd nd nd nd nd nd nd 681714 nd nd nd nd nd nd nd 681715 nd nd nd nd nd nd nd 681716 nd nd nd nd nd nd nd method blank nd nd nd nd nd nd nd No mdl is available for summed combinations of analytes. In summed 1/27/2012 columns (eg., BTEX), the reported values should be considered Page: 4 of 4 ESTIMATED if any of the individual compounds were reported as bdl. GHZcust.xls 21427232 January 27, 2012 Page 15 of 26 GORE(TM) SURVEYS ANALYTICAL RESULTS KOOS AND ASSOCIATES, INC., DALLAS, TX GORE STANDARD TARGET VOCs/SVOCs (A1) ESTIMATED SOIL GAS CONCENTRATIONS FORMER COPPELL AUTO CENTER, COPPELL, TX SITE GHZ - PRODUCTION ORDER #21427232 DATE SAMPLE ANALYZED NAME TPH, ug /m ^3 BTEX, ug /m ^3 BENZ, ug /m ^3 TOL, ug /m ^3 EtBENZ, ug /m "3 mpXYL, ug /m ^3 oXYL, ug /m ^3 MDL= 1.40 1.30 0.81 1.41 1.40 0.74 01/12/12 681697 68.28 5.03 nd 5.03 nd nd nd 01/11/12 681698 95.18 4.80 2.96 1.84 nd nd nd 01/12/12 681699 101.59 1.60 nd 1.60 nd nd nd 01/12/12 681700 25.14 nd nd nd nd nd nd 01/11/12 681701 75.61 1.84 nd 1.84 nd nd nd 01/11/12 681702 220.00 4.41 2.32 2.08 nd nd bdl 01/11/12 681703 >4190.01 9.61 6.87 2.74 bdl bdl nd 01/11/12 681704 1668.60 575.42 nd 16.52 17.04 338.87 202.99 01/11/12 681705 86.00 9.61 2.59 3.87 bdl 1.89 1.26 01/11/12 681706 790.51 6.05 nd nd 1.55 2.87 1.63 01/11/12 681707 228.31 5.52 2.86 2.66 nd nd nd 01/11/12 681708 687.71 743.47 nd 725.54 2.97 10.65 4.31 01/12/12 681709 236.20 1.37 nd 1.37 nd bd1 nd 01/11/12 681710 101.21 1.29 nd 1.29 nd nd nd 01/11/12 681711 46.40 1.29 nd 1.29 nd nd nd 01/12/12 681712 114.49 1.38 nd 1.38 nd nd nd 01/12/12 681713 128.75 25.86 nd 23.29 nd 1.68 0.89 01/12/12 681714 62.73 2.59 nd 2.59 nd nd nd 01/11/12 681715 1.47 nd nd nd nd nd nd 01/12/12 681716 2.34 nd nd nd nd nd nd 01/11/12 method blank nd nd nd nd nd nd nd No mdl is available for summed combinations of analytes. In summed 1/27/2012 columns (eg., BTEX), the reported values should be considered Page: 1 of 6 ESTIMATED if any of the individual compounds were reported as bdl. GHZcust_Conc.xls 21427232 January 27, 2012 Page 16 of 26 GORE(TM) SURVEYS ANALYTICAL RESULTS KOOS AND ASSOCIATES, INC., DALLAS, TX GORE STANDARD TARGET VOCs/SVOCs (Al) ESTIMATED SOIL GAS CONCENTRATIONS FORMER COPPELL AUTO CENTER, COPPELL, TX SITE GHZ - PRODUCTION ORDER #21427232 SAMPLE NAME C11, C13, &C15, ug /m ^3 UNDEC, ug /m ^3 TRIDEC, ug /m ^3 PENTADEC, ug /m ^3 TMBs, ug /m ^3 124TMB, ug /m ^3 MDL= 0.70 0.70 0.70 0.70 681697 bdl bdl nd nd nd nd 681698 bdl bdl nd nd nd nd 681699 bdl bdl nd nd nd nd 681700 bdl nd nd bdl nd nd 681701 bdl bdl nd nd nd nd 681702 3.41 0.77 1.60 1.04 nd nd 681703 bdl bdl nd nd bdl bdl 681704 81.68 47.06 30.56 4.06 934.41 683.82 681705 bdl nd nd bdl 7.08 4.76 681706 nd nd nd nd 15.96 12.39 681707 0.70 bdl 0.70 nd nd nd 681708 bdl nd nd bdl 1.26 1.26 681709 nd nd nd nd nd nd 681710 0.77 0.77 nd nd nd nd 681711 bdl bdl nd nd nd nd 681712 bdl nd bdl bdl nd nd 681713 0.98 0.98 nd bdl 0.98 0.98 681714 bdl bdl nd nd nd nd 681715 nd nd nd nd nd nd 681716 nd nd nd nd nd nd method blank nd nd_ nd nd nd nd No mdl is available for summed combinations of analytes. In summed 1/27/2012 columns (eg., BTEX), the reported values should be considered Page: 2 of 6 ESTIMATED if any of the individual compounds were reported as bdl. GHZcust_Conc.xls 21427232 January 27, 2012 Page 17 of 26 GORE(TM) SURVEYS ANALYTICAL RESULTS KOOS AND ASSOCIATES, INC., DALLAS, TX GORE STANDARD TARGET VOCs/SVOCs (A1) ESTIMATED SOIL GAS CONCENTRATIONS FORMER COPPELL AUTO CENTER, COPPELL, TX SITE GHZ - PRODUCTION ORDER #21427232 SAMPLE NAME 135TMB, ug /m ^3 ct12DCE, ug /m ^3 t12DCE, ug /m ^3 c12DCE, ug /m ^3 NAPH &2 -MN, ug /m ^3 NAPH, ug /m ^3 2MeNAPH, ug /m ^3 MDL= 1.55 27.43 5.24 0.70 0.70 681697 nd nd nd nd nd nd nd 681698 nd nd nd nd nd nd nd 681699 nd nd nd nd nd nd nd 681700 nd nd nd nd nd nd nd 681701 nd nd nd nd nd nd nd 681702 nd nd nd nd bdl nd bdl 681703 nd nd nd nd 1.40 1.40 nd 681704 250.59 nd nd nd 222.65 129.78 92.86 681705 2.32 nd nd nd bdl nd bdl 681706 3.56 nd nd nd 13.86 11.69 2.17 681707 nd nd nd nd nd nd nd 681708 bdl nd nd nd bdl nd bdl 681709 nd nd nd nd 6.67 4.49 2.18 681710 nd nd nd nd nd nd nd 681711 nd nd nd nd bdl nd bdl 681712 nd nd nd nd nd nd nd 681713 bdl nd nd nd nd nd nd 681714 nd nd nd nd nd nd nd 681715 nd nd nd nd nd nd nd 681716 nd nd nd nd nd nd nd method blank nd nd nd nd nd nd nd No mdl is available for summed combinations of analytes. In summed 1/27/2012 columns (eg., BTEX), the reported values should be considered Page: 3 of 6 ESTIMATED if any of the individual compounds were reported as bdl. GHZcust_Conc.xls 21427232 January 27, 2012 Page 18 of 26 GORE(TM) SURVEYS ANALYTICAL RESULTS KOOS AND ASSOCIATES, INC., DALLAS, TX GORE STANDARD TARGET VOCs/SVOCs (A1) ESTIMATED SOIL GAS CONCENTRATIONS FORMER COPPELL AUTO CENTER, COPPELL, TX SITE GHZ - PRODUCTION ORDER #21427232 SAMPLE NAME MTBE, ug /m ^3 11DCA, ug /m ^3 CHCI3, ug /m ^3 111TCA, ug /m ^3 12DCA, ug /m ^3 TCE, ug /m ^3 OCT, ug /m ^3 PCE, ug /m ^3 MDL= 14.32 7.39 2.48 2.97 1.48 2.42 1.62 1.67 681697 nd nd nd nd nd nd nd nd 681698 nd nd nd nd nd nd nd nd 681699 nd nd nd nd nd nd nd nd 681700 nd nd nd nd nd nd nd nd 681701 nd nd nd nd nd nd nd nd 681702 nd nd nd nd nd nd bdl nd 681703 nd nd nd nd nd nd nd nd 681704 nd nd nd nd nd nd 4.87 7.08 681705 nd nd nd nd nd nd bd1 nd 681706 183.11 nd nd nd nd nd nd nd 681707 nd nd nd nd nd nd nd nd 681708 nd nd nd nd nd nd 3.83 11.19 681709 nd nd nd nd nd nd nd nd 681710 nd nd nd nd nd nd nd nd 681711 nd nd nd nd nd nd nd nd 681712 nd nd nd nd nd nd nd nd 681713 nd nd 32.48 nd nd nd nd nd 681714 nd nd nd nd nd nd nd nd 681715 nd nd nd nd nd nd nd nd 681716 nd nd nd nd nd nd nd nd method blank nd nd nd nd nd nd nd nd No mdl is available for summed combinations of analytes. In summed 1/27/2012 columns (eg., BTEX), the reported values should be considered Page: 4 of 6 ESTIMATED if any of the individual compounds were reported as bdl. GHZcust_Conc.xls 21427232 January 27, 2012 Page 19 of 26 GORE(TM) SURVEYS ANALYTICAL RESULTS KOOS AND ASSOCIATES, INC., DALLAS, TX GORE STANDARD TARGET VOCs/SVOCs (Al) ESTIMATED SOIL GAS CONCENTRATIONS FORMER COPPELL AUTO CENTER, COPPELL, TX SITE GHZ - PRODUCTION ORDER #21427232 SAMPLE NAME 14DCB, ug /m ^3 CCI4, ug /m ^3 112TCA, ug /m ^3 CIBENZ, ug /m ^3 1112TetCA, ug /m ^3 1122TetCA, ug /m ^3 13DCB, ug /m ^3 MDL= 0.59 8.51 1.62 2.05 1.47 0.73 0.60 681697 nd nd nd nd nd nd nd 681698 nd nd nd nd nd nd nd 681699 nd nd nd nd nd nd nd 681700 nd nd nd nd nd nd nd 681701 nd nd nd nd nd nd nd 681702 nd nd nd nd nd nd nd 681703 nd nd nd nd nd nd nd 681704 bdl nd nd nd nd nd nd 681705 nd nd nd nd nd nd nd 681706 nd nd nd nd nd nd nd 681707 nd nd nd nd nd nd nd 681708 nd nd nd nd nd nd nd 681709 nd nd nd nd nd nd nd 681710 nd nd nd nd nd nd nd 681711 nd nd nd nd nd nd nd 681712 nd nd nd nd nd nd nd 681713 nd nd nd nd nd nd nd 681714 nd nd nd nd nd nd nd 681715 nd nd nd nd nd nd nd 681716 nd nd nd nd nd nd nd method blank nd nd nd nd nd nd nd No mdl is available for summed combinations of analytes. In summed 1/27/2012 columns (eg., BTEX), the reported values should be considered Page: 5 of 6 ESTIMATED if any of the individual compounds were reported as bdl. GHZcust_Conc.xls 21427232 January 27, 2012 Page 20 of 26 GORE(TM) SURVEYS ANALYTICAL RESULTS KOOS AND ASSOCIATES, INC., DALLAS, TX GORE STANDARD TARGET VOCs/SVOCs (Al) ESTIMATED SOIL GAS CONCENTRATIONS FORMER COPPELL AUTO CENTER, COPPELL, TX SITE GHZ - PRODUCTION ORDER #21427232 SAMPLE NAME 12DCB, ug /m ^3 MDL= 0.59 681697 nd 681698 nd 681699 nd 681700 nd 681701 nd 681702 nd 681703 nd 681704 nd 681705 nd 681706 nd 681707 nd 681708 nd 681709 nd 681710 nd 681711 nd 681712 nd 681713 nd 681714 nd 681715 nd 681716 nd method blank_ nd No mdl is available for summed combinations of analytes. In summed 1/27/2012 columns (eg., BTEX), the reported values should be considered Page: 6 of 6 ESTIMATED if any of the individual compounds were reported as bdl. GHZcust_Conc.xls 21427232 January 27, 2012 Page 21 of 26 TICS - SITE GHZ - PO# 21427232 In Numerical Order Abundance TIC: 00681697.D 800000 600000 400000 200000 0 L Time -> 1.00 2.00 3.00 4.00 5.00 6.00 7.00 8.00 9.00 10.00 11.00 12.00 13.00 14.00 15.00 16.00 17.00 Abundance TIC: 00681698.D 800000 600000 400000 200000 Time -> 1.00 2.00 3.00 4.00 5.00 6.00 7.00 8.00 9.00 10.00 11.00 12.00 13.00 14.00 15.00 16.00 17.00 Abundance TIC: 00681699.D 800000 600000 400000 200000 Time -> 1.00 2.00 3.00 4.00 5.00 6.00 7.00 8.00 9.00 10.00 11.00 12.00 13.00 14.00 15.00 16.00 17.00 Abundance TIC: 00681700.D 800000. 600000 400000 200000 0 Time -> 1.00 2.00 3.00 4.00 5.00 6.00 7.00 8.00 9.00 10.00 11.00 12.00 13.00 14.00 15.00 16.00 17.00 Abundance TIC: 00681701.D 800000 600000 400000 200000 o,,,, Time -> 1.00 2.00 3.00 4.00 5.00 6.00 7.00 8.00 9.00 10.00 11.00 12.00 13.00 14.00 15.00 16.00 17.00 21427232 January 27, 2012 Page 22 of 26 TICS - SITE GHZ - PO# 21427232 In Numerical Order Abundance TIC: 00681702.D 800000 600000 400000 200000 0 Time -> 1.00 2.00 3.00 4.00 5.00 6.00 7.00 8.00 9.00 10.00 11.00 12.00 13.00 14.00 15.00 16.00 17.00 Abundance TIC: 00681703.D 800000 600000 400000 200000 0 � , 4 r - ' . 7 I I � I P 1Y'^.^'I° ^ 'a 1 , A P r , ■ , 1 , , Time -> 1.00 2.00 3.00 4.00 5.00 6.00 7.00 8.00 9.00 10.00 11.00 12.00 13.00 14.00 15.00 16.00 17.00 Abundance TIC:00681704.D 800000 600000 400000 1 I t 1 200000 Time -> 1.00 2.00 3.00 4.00 5.00 6.00 7.00 8.00 9.00 10.00 11.00 12.00 13.00 14.00 15.00 16.00 17.00 Abundance TIC: 00681705.D 800000 600000 400000 200000 0 Time -> 1.00 2.00 3.00 4.00 5.00 6.00 7.00 8.00 9.00 10.00 11.00 12.00 13.00 14.00 15.00 16.00 17.00 Abundance TIC: 00681706.D 800000 600000 400000 200000. 1 0 , i , , . 44 A 4 AL Lrk.,•ry -r i r0lrio ""Jil r , Time -> 1.00 2.00 3.00 4.00 5.00 6.00 7.00 8.00 9.00 10.00 11.00 12.00 13.00 14.00 15.00 16.00 17.00 21427232 January 27, 2012 Page 23 of 26 TICS - SITE GHZ - PO# 21427232 In Numerical Order Abundance TIC: 00681707.D 800000 600000 400000 200000' Time -> 1.00 2.00 3.00 4.00 5.00 6.00 7.00 8.00 9.00 10.00 11.00 12.00 13.00 14.00 15.00 16.00 17.00 Abundance TIC: 00681708.D 800000 600000 400000 200000 0 , - rN N r"-, "It " r. , Time -> 1.00 2.00 3.00 4.00 5.00 6.00 7.00 8.00 9.00 10.00 11.00 12.00 13.00 14.00 15.00 16.00 17.00 Abundance TIC: 00681709.D 800000 600000 400000 200000 Time -> 1.00 2.00 3.00 4.00 5.00 6.00 7.00 8.00 9.00 10.00 11.00 12.00 13.00 14.00 15.00 16.00 17.00 Abundance TIC: 00681710.D 800000 600000. 400000 200000 Time -> 1.00 2.00 3.00 4.00 5.00 6.00 7.00 8.00 9.00 10.00 11.00 12.00 13.00 14.00 15.00 16.00 17.00 Abundance TIC: 00681711.D 800000 600000 400000 200000 0 Time -> 1.00 2.00 3.00 4.00 5.00 6.00 7.00 8.00 9.00 10.00 11.00 12.00 13.00 14.00 15.00 16.00 17.00 21427232 January 27, 2012 Page 24 of 26 TICS - SITE GHZ - PO# 21427232 In Numerical Order Abundance TIC: 00681712.D 800000 600000 400000 200000 Time -> 1.00 2.00 3.00 4.00 5.00 6.00 7.00 8.00 9.00 10.00 11.00 12.00 13.00 14.00 15.00 16.00 17.00 Abundance TIC: 00681713.D 800000 600000 400000 200000 0 Time -> 1.00 2.00 3.00 4.00 5.00 6.00 7.00 8.00 9.00 10.00 11.00 12.00 13.00 14.00 15.00 16.00 17.00 Abundance TIC: 00681714.D 800000 600000 400000 200000 0 L_ Time -> 1.00 2.00 3.00 4.00 5.00 6.00 7.00 8.00 9.00 10.00 11.00 12.00 13.00 14.00 15.00 16.00 17.00 Abundance TIC: 00681715.D 800000 600000. 400000 200000 0 Time -> 1.00 2.00 3.00 4.00 5.00 6.00 7.00 8.00 9.00 10.00 11.00 12.00 13.00 14.00 15.00 16.00 17.00 Abundance TIC: 00681716.D 800000 600000 400000 200000 Time -> 1.00 2.00 3.00 4.00 5.00 6.00 7.00 8.00 9.00 10.00 11.00 12.00 13.00 14.00 15.00 16.00 17.00 21427232 January 27, 2012 Page 25 of 26 W. L. GORE & ASSOCIATES, INC. SALES OFFICES: 100 Chesapeake Blvd. • P.O. Box 10 Europe: +49.89.4612.2198 GORE Elkton, MD 21922 -0010 San Francisco: 415.648.0438 Phone: 410.392.7600 • 800.432.7998 Email: environmental @wlgore.com Fax: 410.506.4780 Creative Technologies Worldwide gore.com /surveys GORE and designs are trademarks of W. L Gore & Associates. Inc. ©2007 W. L. Gore & Associates. Inc. 21427232 January 27, 2012 Page 26 of 26 APPENDIX D GORE 0 Surveys FOR ENVIRONMENTAL Mapping Report Site: Former Coppell Auto Center Prepared for: KOOS AND ASSOCIATES, INC. 10410 MARKISON ROAD DALLAS, TX UNITED STATES Prepared on: January 27, 2012 Gore Production Order Number: ENV 21427232 © 2012 W. L. Gore & Associates, Inc. \SPG_Envirofinal_mE 21427232 January 27, 2012 Page 1 of 9 i GORE Survey - Mapping Report Project Summary W. L. Gore & Associates, Inc. (Gore) provided the GORE Survey (Survey) used at: Former Coppell Auto Center The service provided by Gore to meet the project objective included delivery of the required quantity of GORE Modules, analysis by the method described for the requested organic compounds, and reporting of the data. A Laboratory Report was issued previously which summarized the field sampling and analytical procedures, and contained the sample results. Normally, when printed at scale, the maps are 11 x 17 inch in size. Other sizes are available upon request. General and project specific comments on the contouring and mapping can be found on the next page. Maps prepared by: Jay W. Hodny Project Manager Maps reviewed /approved by: Dayna Cobb Project Manager © 2012 W. L. Gore & Associates, Inc. \SPG_Envirofinal_map 21427232 January 27, 2012 Page 2 of 9 lr GOR Survey - Mapping Report General Comments A minimum curvature algorithm was used to interpolate the data from the sample locations to a regularily- spaced grid. The resulting surface is considered to be the smoothest possible surface that will fit the observed values at each sample location (i.e., data honoring). The interpolation is performed in log space, with grid cell sizes approximately one -tenth the average distance between sample locations. For example, when GORE Modules are placed about 50 feet apart, the grid cell size is set to five feet. Where observations trend from lower to higher values, and moving towards the edge of the area sampled, the contour surface will continue to rise (showing warmer colors) as no additional data exist to constrain the interpolation. Where observations trend from high to low, towards the edge of the area sampled, the opposite is true. Contour minimums and maximums used in the color interval assignment are established based on the QA blank levels (trip and method blanks), method detection limits, and maximum values observed. The minimum contour level (gray color) is established using the maximum QA blank level or method detection limit, whichever is greater, per compound or groups of compounds. The maximum contour level is set at the maximum value observed, per compound or groups of compounds. Contour interval assignments can be modified at the client's request. Project Specific Comments None. © 2012 W. L. Gore & Associates, Inc. \SPG_Envirofinal_nu 21427232 January 27, 2012 Page 3 of 9 o su W.L. 000E 1.000CIATES ; i _ r' .1 4,14, ,..„, ..... ... - ' : *.P.' - L 6.871 VII I .. , :. ' .4 : I-A ' E �� • _ , N = r 6.321 ,, \ 5.816 5.351 • II e 4.923 !���, 4.529 al �� 4.167 p O • ` • O r • 3.834 • 0 `� LL p ^ I) • ` iiii 11� -� . ... 3.245 r. -.� `�. I 2.985 ] . � , I 2.747 ,# 0110 O , �� O D O ' .I � , : 2 . 3 v . 2 �� 2.139 j 1 __MMI1O _ 1.8 - ;' O O M* O Al O 1.666 .° .` u r • " " �• 1.532 . i •is ,, 1.410 r I,idfi U) Air t 1.297 Benzene f, IN : . ifs [ug /m3] - t 2 I IlLeurrn 1 ........ IL LI . 4 . ,,. , ,,,,,, ,.._...,,,,..„ .., )...,_... , is . Pt, ". �!► a' ■ GORE TM Surveys for Environmental Site Assessment .'7:-.1 - W.L. GORE & ASSOCIATES, INC. s _ .. .. a ] , .. ".,�'- . , 1 ELKT 21021 D W CHESAPEAKE BOULEVARD ... n;xx.r , ON, MD, USN URA . 6+. . Creof�trlloroyoaa (410)392-7600 Koos and Associates, Inc., Dallas, TX Former Coppell Auto Center, Coppell, TX Benzene - Estimated Soil Gas Concentrations Scale 1:600 GORE and designs are lrademams of W L. GORE &Associates 25 0 25 50 75 100 125 DATE DRAWN: 24 Jan 2012 DRAWN BV: JH ORIG. CAD: Sib Plan...dwO SRI CODE: OHZ o ug .a s„ «.,. r ; .nswe Tu 4. e+. 7. wo (feet) _ _- -_ onEa ww r•vc uws. REV. DATE: REV. 0: PROJECT NUMBER: 21427232 21427232 January 27, 2012 Page 4 of 9 O fall W.L OGRE R AEEOCMTEI f 1 ' 1 1 • — v �►�r - ■ k fna ; i 743.019 N l- W : , s c � ''� .' J 439.036 ✓ \ 259.418 > 153.285 B.A. : • -` 90.573 . ,„ _ —! �G�� ii 53.528 18.685 , -..911 , 0 0 4 • nu , ,_ \ 518 � s: it ; �4 11� ` 1 1.041 r \ 111 w ]x, 6.524 ,acs ° rrx> 1h �.� _i � � - s 3.855 tti t O ' • O O i `` 2.278 • • ��� 1.346 0.795 0.470 t I i �Ini"' 0.278 • ] I 0 0 f 0 0 0.164 0.097 ..A 0.057 E fi. , ar, RENO 0.034 (1) 0.020 c ,r A.' ." BTEX m .% .. [ug /m3] 2 B pipp 1I/ i {]taISt9w I k ,;���i� GORE TM Surveys for Environmental Site Assessment MI t yyy i� o.� W.L. GORE & ASSOCIATES, INC. 6 1 icXX 100 CHESAPEAKE BOULEVARD d % .,' W I ELKTON, MD, USA 21921 Cmativa lecnndoVies USA +, 'I + Worldwide (410)392-7600 Koos and Associates, Inc., Dallas, TX Former Coppell Auto Center, Coppell, TX BTEX - Estimated Soil Gas Concentrations Scale 1:600 GORE and designs em trademarks of L. GORE B Associates 25 0 25 50 75 100 125 DATE DRAWN: 24 JM 2012 DRAM BY: JH ORIG. CAD: SIM Plan...dw9 SITE CODE: DIM onen.wLrmE wws. O0¢° ies's snacnr vo�wreo rtrauwr ro carrnort, nemww uo ( O REV. DATE: REV. Ilk PROJECT NUMBER: 21427232 21427232 January 27, 2012 Page 5 of 9 O 2012 W.L. 000110101000201 • � '► - yam i 1 � s �. :�� _ . x �i . ,_. �� 935.406 N l�� m � � . 9 546.387 . y . .n..x".. \ i i \ 319.154 M 108.893 .. =t - . . . _ 63.606 a - r 37.154 •... O O 0 O • , ,,et, _ _ -yy L 21.702 1 \` O A.:.... � ' 1 ; r f 1 i r • \ 1 ' 1111111 _ 7.405 4.325 0 i ' — � O 1" ' 0 im 2.526 1.476 0.862 y 1 ' 0.504 ,. iii + • 1,. 0.172 QI 0 '- 0 O 0 0.100 681 ii , 0 � RR' 'V' «'4.' 0.034 Wig, a ' 0.020 C . P« ' * TMBs .@ _ - [ug /m3] 2 1 ,...... . , ; j —� gr.. .— . - - � . ire ��_ .A. -'�. ∎vws �!� GORE TM Surveys for Environmental Site Assessment „ turf M u 00: r. � � /�'� W.L. GORE & ASSOCIATES, INC. ' : 'f AXA 4'' I C I 100 CHESAPEAKE BOULEVARD ; ',;, ELKTON, BD, USA 21921 1 : *'A` t Craotive Technologies USA ' r WorM.iCe 14101292.1000 Koos and Associates, Inc., Dallas, TX Former Coppell Auto Center, Coppell, TX 1,2,4- & 1,3,5 - Trimethylbenzene Scale 1:600 Estimated Soil Gas Concentrations GQ4E end Cosigns are fretlemerks o/W L GORE 8 Associalea 25 0 25 50 75 100 125 DATE DRAWN: 24 J00 2012 DRAWN BY: JH ORIG. CAD: Site Plan...OW9 SITE COOS: GHZ 1 I na0 u sE is snecnr wSEO e naurrt it car port nwl•w2• ri0 (f) on•0.wwu.i• uws REV. DATE: REV. /: PROJECT NUMBER: 2181772 21427232 January 27, 2012 Page 6 of 9 o my W.L. 001E • ASSOCIATES 5` J ✓ • r 0 ' � �► lll 129.718 N 99.896 76.931 59.245 = I I 0.1 45.625 . 1111=11111111111111111111111M ,!1 _ � �G:ii 35.136 TAT 27.058 ;O ir: 2 r+ 1�\ �.1 O • 5.644 .... 0100 , f 4.347 3.347 a Mil - 2.578 1 1,L , 1 ° iii• 1.985 : 3 0 O �• 0 • 0 1.529 1.177 1 ., � �l � 0.907 0.698 . ,,;� Naphthalene E1L.a.. ''':':,-4, 3 1 VNIIIPIr .. . 111111111•1111111111 IMO/ i11���li111w \ GORE TM Surveys for Environmental Site Assessment _. \ . Got, Y 0 Il ® " 17.1«, ` , \, W.L. GORE & ASSOCIATES, INC. tiR 1 N x x 1 100 CHESAPEAKE BOULEVARD ELKTON. 110, USA 21921 Craotiw ischndo0iss USA WwlOwiM (410)292 -1500 Koos and Associates, Inc., Dallas, TX Former Coppell Auto Center, Coppell, TX Naphthalene - Estimated Soil Gas Concentrations Scale 1:600 GORE and oesyns are trademarks of W.L. GORE 6 Assoc42Jea 25 0 25 50 75 100 125 DATE DRAWN: 24 Jan 2012 DRAWN BY: JH ORIG. CAD: SIp Plan..AWB SITE CODE: 042 olE • ISS uws o IS Smcnr naSann MEOW, TO ccerwon. SW,Eaex.an (feet) REV. DATE: REV. R PROJECT NUMBER: 21427232 21427232 January 27, 2012 Page 7 of 9 o NU W.L. GORE • ASSOCIATES i z YIP' N - w J a � \ I � MI - 1 11.194 4 m .-. - � ..,.,- 10.178 ., 9.253 8.413 f11 ttu ( i tIr'Flelfre ` '� ■ 7.649 —' � 0 !! 6.954 O • 6.323 ` • O t • 1. 5.748 \ O � , , 1 I i i 5.226 + \ ,ii I , • I . `1` 3.928 O • • O • O 'y4� ' 3.571 ■ ■i- i 3.247 ■ 2.952 ` 2.684 11111•11• 2.440 O • 'w• 0 • 0 681 ,- 2.218 .814 Qt . 1 M y . 1.834 1.667 la . c I PCE # i 4 1 r . ' I 11 � ,.„..; * . . IrOM' . : I III__,Z • _ ^ 'L 11E11-111i !ii GORE TM Surveys for Environmental Site Assessment Q\ .`ire x,7:51 L \, W.L. GORE & ASSOCIATES, INC. 1 100 CHESAPEAKE BOULEVARD ELKTON. MD, USA 21921 Creati /echnologias USA WaNdwrtle (0101292-]600 - Koos and Associates, Inc., Dallas, TX Former Coppell Auto Center, Coppell, TX Tetrachloroethene - Estimated Soil Gas Concentrations Scale 1:600 GORE and designs ere trademarks of W.L. GORE B Associates 25 0 25 50 75 100 125 DATE DRAWN: 24 Jan 2012 DRAWN BV: JH ORIG. CAD: 212 P1an...0W0 WV COBS: GN2 VI I. POW A. AsscamEs anaAUwroais uws °a "g is amcnr wo,eino vsaarrvr m pp.. , 1w1ELww ro (feet) REV. DATE: REV. 9: PROJECT NUMBER: 21427232 21427232 January 27, 2012 Page 8 of 9 W. L GORE & ASSOCIATES, INC. SALES OFFICES: 100 Chesapeake Blvd. • P.O. Box 10 Europe: +49.89.4612.2198 GORE o Elkton, MD 21922 -0010 San Francisco: 415.648.0438 I o Phone: 410.392.7600 • 800.432.7998 Fax: 410.506.4780 Email: environmental @wlgore.com Creative Technologies es Worldwide gore.com /surveys GORE and designs are trademarks of W. L. Gore & Associates, Inc. 02007 W. L. Gore & Associates, Inc. 21427232 January 27, 2012 Page 9 of 9