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Home My WebLink AboutSF_F_NCN000410534_20220902_FRB_PASI(2)Staley PCE Wells NCN 000 410 534 Site Reassessment References August 2022 1) United States Environmental Protection Agency (EPA) 40 Code of Federal Regulations - Part 300, Hazard Ranking System, July 1, 2019, Available On-line at: https://semspub.epa.gov/work/HQ/100002489.pdf 2) United States Environmental Protection Agency, Superfund Chemical Data Matrix, Appendix B, Updated July, 2022. Query at: https://www.epa.gov/superfund/superfund-chemical-data-matrix-scdm-query 3) Parker, Stuart F., NC DEQ Superfund Section: “Site Inspection Report, Staley PCE Wells site, EPA ID NCN 000 410 534, Staley, Randolph County, NC. September 2012. 4) Google Maps imagery for Staley, Randolph County, NC. https://www.google.com/maps 5) Gamble, James M., NC DENR Superfund Section: “Pre-CERCLIS Screening Assessment (PSA)”, Staley PCE Wells, Staley, Randolph County, NC”. October 27, 2010. 6) Gamble, James M., NC DENR Superfund Section: “Preliminary Assessment (PA), Staley PCE Wells, Staley, Randolph County, NC”. October 28, 2010. 7) NC DEQ Superfund Section Inactive Hazardous Sites Branch: Correspondence, maps and Summary Table pertaining to residential well sampling, Staley PCE Wells site, December 2017. 8) Parker, Stuart F., NC DEQ Superfund Section: “Supplemental Site Inspection Report, Staley PCE Wells site, EPA ID NCN 000 410 534, Staley, Randolph County, NC. August 15, 2014. 9) S&ME, Inc., Raleigh, NC: “Soil Vapor Assessment, Staley PCE/Browns Grocery, Liberty, NC”, NC ID: NCN 000 410 534, August 24, 2016. 10) NC DEQ Superfund Section Inactive Hazardous Sites Branch: ARC GIS IHSB Map Viewer: https://ncdenr.maps.arcgis.com/apps/webappviewer/index.html?id=1ff22e6cebe44424b64 df2fa4c5fc759 11) US EPA Vapor Intrusion Screening (VISL) Level Calculator Output. August 5, 2022: https://epa-visl.ornl.gov/cgi-bin/visl_search 12) Parker, Stuart F, NC Superfund Section: SRR Passive Soil Gas Sampling Field Notes. July 22 and August 4, 2022. REFERENCE 1 Pt. 300, App. A 40 CFR Ch. I (7-1-19 Edition) involuntarily obtains ownership or control of property by virtue of its function as sovereig·n; (2)Acquisitions by or transfers to a government entity or its agent (including governmental lending and credit institutions, loan guarantors, loan insurers, and financial reg·ulatory entities which acquire security interests or properties of failed private lending or depository institutions) acting as a conservator or receiver pursuant to a clear and direct statutory mandate or reg·ulatory authority; (3)Acquisitions or transfers of assetsthroug·h foreclosure and its equivalents (as defined in 40 OFR 300.ll00(d)(l)) or other means by a Federal, state, or local government entity in the course of administering a g·overnmental loan or loan guarantee or loan insurance progTam; and (4)Acquisitions by or transfers to a government entity pursuant to seizure or forfeiture authority. (b)Nothing· in this section or in OEROLA section 101(20)(D) or section 101(35)(A)(ii) affects the applicability of 40 OFR 300.1100 to any security interest, property, or asset acquired pursuant to an involuntary acquisition or transfer, as described in this section. NOTE TO PARAGRAPHS (a)(3) AND (b OF THIS SECTION: Reference to 40 CFR 300.1100 is a reference to the provisions regarding secured creditors in CERCLA sections 101(20)(:E)-(G), 42 U.S.C. 9601(20)(:E)-(G). See Section 2504(a) of the Asset Conservation, Lender Liability, and Deposit Insurance Protection Act, Public Law, 104---208, 110 Stat. 3009-462, 3009-468 (1996). APPENDIX A TO PART 300-THE HAZARD RANKING SYSTEM Table of Contents List of Figures List of Tables 1.0. Introduction. 1.1 Definitions. 2.0 Evaluations Common to Multiple Path-ways. 2.1 Overview. 2.1.1 Calculation of HRS site score. 2.1.2 Calculation of pathway score. 2.1.3 Common evaluations. 2.2 Characterize sources. 2.2.1 Identify sources. 2.2.2 Identify hazardous substances associated with a source. 2.2.3 Identify hazardous substances available to a pathway. 2.3 Likelihood of release. 2.4 Waste characteristics. 2.4.1 Selection of substance potentially posing· greatest hazard. 2.4.1.1 Toxicity factor. 2.4.1.2 Hazardous substance selection. 2,4,2 Hazardous waste quantity, 2.4.2.l Source hazardous waste quantity. 2.4.2.1.1 Hazardous constituent quantity. 2.4.2.1.2 Hazardous wastestream quantity. 2.4.2,1.3 Volume. 2.4.2.1.4 Area. 2.4.2.1.5 Calculation of source hazardous waste quantity value, 2.4.2.2 Calculation of hazardous waste quantity factor value, 2.4,3 Waste characteristics factor category value. 2.4.3.1 Factor category value. 2.4.3.2 Factor category value, considering bioaccumulation potential. 2,5 Targets. 2.5,l Determination of level of actual con-tamination at a sampling location. 2.6.2 Comparison to benchmarks. 3,0 Ground Water Migration Pathway, 3,0,1 General considerations, 3.0.1.1 Ground water target distance limit. 3.0.1.2 Aquifer boundaries. 3.0.1.2,1 Aquifer interconnections, 3,0,1.2.2 Aquifer discontinuities, 3.0.1.3 Karst aquifer. 3.1 Likelihood of release, 3,1.1 Observed release, 3,1,2 Potential to release, 3.1.2.l Containment, 3.1.2.2 Net precipitation, 3.1.2.3 Depth to aquifer. 3.1.2.4 Travel time. 3,1.2.5 Calculation of potential to release factor value, 3.1.3 Calculation of likelihood of release factor category value. 3.2 Waste characteristics, 3,2,1 Toxicity/mobility, 3.2.1.l Toxicity. 3.2.1.2 Mobility, 3.2.1.3 Calculation of toxicity/mobility factor value, 3,2,2 Hazardous waste quantity, 3,2.3 Calculation of waste characteristics factor category value, 3,3 Targets. 3.3,l Nearest well, 3.3,2 Population. 3.3.2.l Level of contamination. 3.3.2.2 Level I concentrations. 3.3,2,3 Level II concentrations, 3.3.2.4 Potential contamination, 3,3,2,5 Calculation of population factor value, 3,3,3 Resources. 3,3.4 Wellhead Protection Area, 3,3,5 Calculation of targets factor category value, 3.4 Ground water migration score for an aquifer, 110 1 REFERENCE 2 Superfund CONTACT US <https://epa.gov/superfund/forms/contact-us-about-superfund> Superfund Chemical Data Matrix (SCDM) Query Last Update: July 2022 Report URL: https://www.epa.gov/superfund /superfund%2Dchemical%2Ddata%2Dmatrix%2Dscdm%2Dquery?substanceAuto=&c=000127%2D18%2D4& c=000079%2D01%2D6&b=b1&b=b6 Substance: Tetrachloroethylene [CASRN 000127-18-4] Query Accessed: 8/6/2022 Benchmarks: Ground Water Pathway Tetrachloroethylene [CASRN 000127-18-4] Parameter Value Unit MCL 5.00E-03 mg/L MCLG ---- Cancer Risk 3.71E-02 mg/L Non-Cancer Risk 1.20E-01 mg/L An o�icial website of the United States government MENU Search EPA.gov Superfund Chemical Data Matrix (SCDM) Query | US EPA https://www.epa.gov/superfund/superfund-chemical-data-matrix-scdm-... 1 of 6 8/6/2022, 4:41 PM Benchmarks: Subsurface Intrusion Component Tetrachloroethylene [CASRN 000127-18-4] Parameter Value Unit Cancer Risk 1.08E-02 mg/m Non-Cancer Risk 4.17E-02 mg/m 3 3 Superfund Chemical Data Matrix (SCDM) Query | US EPA https://www.epa.gov/superfund/superfund-chemical-data-matrix-scdm-... 2 of 6 8/6/2022, 4:41 PM Substance: Trichloroethylene [CASRN 000079-01-6] Query Accessed: 8/6/2022 Benchmarks: Ground Water Pathway Trichloroethylene [CASRN 000079-01-6] Parameter Value Unit MCL 5.00E-03 mg/L MCLG ---- Cancer Risk 1.19E-03 mg/L Non-Cancer Risk 1.00E-02 mg/L Benchmarks: Subsurface Intrusion Component Trichloroethylene [CASRN 000079-01-6] Parameter Value Unit Cancer Risk 4.78E-04 mg/m Non-Cancer Risk 2.09E-03 mg/m Superfund Home <https://epa.gov/superfund> Learn About Superfund <https://epa.gov/superfund/learn-about-superfund> Community Involvement 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Superfund Chemical Data Matrix (SCDM) Query | US EPA https://www.epa.gov/superfund/superfund-chemical-data-matrix-scdm-... 5 of 6 8/6/2022, 4:41 PM Privacy and Security Notice <https://epa.gov/privacy /privacy-and-security- notice> Superfund Chemical Data Matrix (SCDM) Query | US EPA https://www.epa.gov/superfund/superfund-chemical-data-matrix-scdm-... 6 of 6 8/6/2022, 4:41 PM REFERENCE 3 TABLE OF CONTENTS EXECUTIVE SUMMARY 1.0 INTRODUCTION ...............................................................................................................1 2.0 SITE DESCRIPTION, OPERATIONAL HISTORY AND WASTE CHARACTERISTICS ................................................................................1 2.1 Site Location ............................................................................................................1 2.2 Site Description ........................................................................................................1 2.3 Site Operational and Regulatory History ................................................................2 2.3.1 Brown’s Grocery ..........................................................................................2 2.3.2 Discovery of Groundwater PCE Contamination..........................................2 2.3.3 CERCLA Investigation ................................................................................3 3.0 WASTE / SOURCE SAMPLING ......................................................................................4 4.0 GROUNDWATER PATHWAY .........................................................................................4 4.1 Hydrogeologic Setting .............................................................................................4 4.2 Groundwater Targets ...............................................................................................4 4.3 Groundwater Sampling ............................................................................................5 4.4 Groundwater Conclusions ........................................................................................7 5.0 SURFACE WATER PATHWAY .......................................................................................7 5.1 Hydrologic Setting ...................................................................................................7 5.2 Surface Water Targets..............................................................................................8 5.3 Surface Water Pathway Sampling ...........................................................................8 5.4 Surface Water Pathway Results ...............................................................................8 5.5 Surface Water Pathway Conclusions .......................................................................8 6.0 SOIL EXPOSURE AND AIR PATHWAYS ......................................................................8 7.0 SI SUMMARY AND CONCLUSIONS ..............................................................................9 LIST OF FIGURES Figure 1: 4-mile Radius with Community Wells (GIS) Figure 2: Site Layout Map and Potable Wells Figure 3: Pre-SI Groundwater Contaminant Summary Figure 4: November 2010 Groundwater PCE Sampling Results Figure 5: May 2011 Groundwater PCE Sampling Results Figure 6: December 2011 Groundwater PCE Sampling Results Figure 7: Surface Water Pathway to 15 Miles LIST OF TABLES Table 1: November 2010 Groundwater Sampling Results Table 2: May 2011 Groundwater Sampling Results Table 3: December 2011 Groundwater Sampling Results Table 4: Groundwater PCE Detection Summary LIST OF APPENDICES Appendix A: SI Sample Location Geographic Coordinates Appendix B: SI Sample Analytical Data Reports Appendix C: Well Owner Access Forms EXECUTIVE SUMMARY The Staley PCE Wells (formerly Staley TCE Wells) site is located near the intersection of NC Highway 49, and Whites Chapel Road, west of Staley, Randolph County, NC. State officials discovered tetrachloroethene (PCE) groundwater contamination in 2006, when sampling residential wells near the adjacent Brown’s Exxon (Brown’s Grocery) petroleum underground storage tank (UST) site at the intersection. State and County investigation from 2006 to 2010 confirmed that PCE contamination locally exceeded drinking-water limits in several contiguous domestic wells. In 2010, at the request of the NCDENR Superfund Section, the EPA conducted a Removal Action, installing filtration units on four of the contaminated domestic wells at the site. Subsequent to the EPA Removal Action, the NC Superfund Section conducted iterative SI sampling events during November 2010, May 2011 and December 2011. The SI sampling events delineated the area where residential wells contained PCE contamination and quantified low-level trichloroethene (TCE) contamination in some wells. SI sampling confirmed the continuing effectiveness of the filtration units installed by the EPA. Sampling also identified a fifth residential well in need of filtration, which (along with maintenance at the other four wells) is being addressed using the NC Division of Waste Management (DWM) Inactive Hazardous Sites Cleanup Fund. Three local small businesses and an electric utility station are potential sources for the PCE contamination of groundwater at the site. No subsurface exploration or candidate source sampling was conducted as part of the SI. The entire study area within a 4-mile radius of the site depends on groundwater as a drinking-water source. Most supplies consist of individual residential wells; only two community residential supply wells were identified, and no municipal groundwater well systems operate inside the study area. SI sampling revealed intermittent, low-level PCE contamination in a single surface spring located down gradient (west) from the contaminated domestic wells. This and a second spring to the north are the likely probable points of entry (PPEs) to the site’s 15-mile surface water pathway, which extends west and then south and southeast past Franklinville and Ramseur, NC. The lower pathway includes Sandy Creek and a municipal reservoir. However, the nearest mapped wetland and surface water intake are located 3.6 and 8 miles downstream from the PPEs, respectively. Due to the intermittent contamination, contaminant volatility and limited stream flow near the site, no further surface water pathway sampling was conducted as part of the SI. In summary, the SI results indicate groundwater contamination associated with an unknown source. All 5 wells with contamination exceeding health-based drinking water benchmarks are now equipped with carbon filtration units monitored and maintained by the NC DWM. REFERENCE 4 REFERENCE 5 .^«si NCDENR North Carolina Department of Environment and Natural Resources Dexter Matthews, Director Division of Waste Management Beverly Eaves Perdue, Governor Dee Freeman, Secretary October 27, 2010 Ms. Carolyn Callihan yi-^Xr- > _>-^t\ «- 7, Superfund Site Evaluation Section CV f^Q'f^^ -t/Ty US EPA Region IV Waste Division f H » ^ A^i/ 61 Forsyth Street, 11th Floor P f\ ^ Atlanta, GA 30303-3104 Subject: Pre-CERCLl^^te Assessment (PSA) Staley^ree-Wells CERCLIS ID No. NCN 000 410 534 6488 Whites Chapel Road Staley, Randolph County, NC 27355 Dear Ms. Callihan: NC Superfiind Section has completed the Pre-CERCLIS Site Assessment (PSA) for the Staley TCE Wells site in Randolph County, NC. Based on the impact at ground water targets, the number of surrounding targets, and the absence of an altemate water source for the community, the NC Superfiand Section recommends additional assessment under CERCLA. The Staley TCE Wells site is the location of a PCE and TCE ground water plume from an unknown source. State records indicate that PCE was first detected in five drinking water wells in February 2006. As part of an environmental investigation of a nearby petroleum plume, an environmental consultant tested nearby drinking water wells. PCE is not associated with the petroleum release; which prompted the UST Section to contact the county health department. Additional sampling by the county health department confirmed the presence of PCE. Project highlights are as follows: 1. The site is located near Staley, Randolph County NC. The site location is 35.7902° north latitude and 79.5971° west longitude. (Ref! 1) The site reference point is the location ofthe well with the highest PCE concentrations. The property address at that location is 6488 Whites Chapel Road, Staley, NC 27355. The surrounding countryside is rural residential interspersed with large undeveloped tracts. Staley TCE Wells NCN 000 410 534 PSA October 27,2010 Page 2 of 3 2. Ground water is the sole source of potable water for the surrounding community. Twenty-nine area water wells have been tested. Fifteen of the wells contain at least trace concentrations of PCE and / or TCE. The highest concentration detected was 163 fig/1 PCE at 6488 Whites Chapel Road. Currently, there is no altemative water source for the community. NC Superfiind Section staff estimated the population within four miles of the site by examining aerial images (dated 2007). Each house was assumed to have a well and a population equal to the estimated per household population. (Ref 2) Estimated populations using ground water for drinking are: 90 within y* mile, 141 between % and Vi mile, 267 between Vi and 1 mile, 658 between 1 and 2 miles, 1414 between 2 and 3 miles, and 1795 between 3 and 4 miles. Approximately eights well within % mile remain untested. 3. Twenty-nine area water wells have been sampled in connection with either the Brown's Grocery US I site or Randolph County Health Departments" monitoring of the PCE plume. Sample events have occurred over the last four years; the same set of wells was not sampled each time. Table 2 (Ref 3) presents the highest concentration detected in each well. 4. USEPA installed filter systems at two houses in March 2010. USEPA continues to maintain the filter systems. Several other residents are being supplied with bottled water. (Ref. 4) Due to the number of residences using ground water and the lack of an altemative in the area, the NC Superfiind Section Recommends that additional assessment be conducted under CERCLA. If you have any questions or need additional information you may contact Jim Bateson by phone at (919)508-8449 or via email atjames.bateson@ncdenr.gov. Sincerely, ^.77.77 ' -- '^ /•„.nj> A/. /^vw» y_,/.-^ y^^a,;^^-^ mes M. Gamble, P.G. jfm Bateson, Head Hydrogeologist Site Evaluation and Removal Branch NC Superfund Section NC Superfund Section Cc: site screening file Approved by: COAJLLf^ (^rillckZU^ Date: ///s//^ Carolyn Cal|((/ian, NC Site Management Secfion, EPA Region 4 Superfiind Attachments Pre-CERCLIS Screening Assessment Checklist / Decision Form Staley TCE Wells NCN 000 410 534 PSA October 27, 2010 Page 3 of 3 List of References 1. Latitude and Longitude Calculafion Worksheet and Site Location Map 2. Ground Water Use within 4 Miles 3. Summary of Laboratory Analytical Data and PCE and TCE in Ground Water Map 4. February 2010 USEPA Pollution Report Reference 1 Latitude and Longitude Calculation Worksheet and Site Location Map LATITUDE AND LONGITUDE CALCULATION WORKSHEET #2 LI USING ENGINEER'S SCALE (1/60) SITE NAME: STALEY TCE WELLS CERCLIS #: NCN 000 410 534 AKA: 0 SSID: ADDRESS: 6488 Whites Chapel Road CITY: Staley STATE: NC ZIP CODE: 27355 SITE REFERENCE POINT: location of well with TCE USGS QUAD MAP NAME: SCALE: 1 : 24,000 MAP DATS: 1974 MAP DATUM 1927 TOWNSHIP: SECTION: MERIDIAN: _N/S 1/4 RANGE: 1/4 - E/W 1/4 1983 (CIRCLE ONE) COORDINATES FROM LOWER RIGHT (SOUTHEAST) CORNER OF 7.5' MAP (attach photocopy) LONGITUDE: 79 ° 30 ' 0.00 " LATITUDE: 35 ° 45 '0.00 COORDINATES FROM LOWER RIGHT (SOUTHEAST) CORNER OF 2.5' GRID CELL: LONGITUDE: 79 ° 35 ' 0.00 " LATITUDE: 35 ° 45 '0.00 CALCULATIONS: LATITUDE (7.5' QUADRANGLE MAP) A) NUMBER OF RULER GRADUATIONS FROM LATITUDE GRID LINE TO SITE REF POINT: 438 B) MULTIPLY (A) BY 0.3304 TO CONVERT TO SECONDS: A X 0.3304 = 144.72 " C) EXPRESS IN MINUTES AND SECONDS (1' = 60") : 2 ' 24.72 " ADD TO STARTING LATITUDE: 35 ° 45 ' 0.00 " + 2 ' 24.72 SITE LATITUDE: 35 O 47 ' 24.72 " 35.7902 ° CALCULATIONS: LONGITUDE (7.5' QUADRANGLE MAP) A) NUMBER OF RULER GRADUATIONS FROM RIGHT LONGITUDE LINE TO SITE REF POINT: 150 B) MULTIPLY (A) BY 0.3304 TO CONVERT TO SECONDS: A X 0.3304 = 49.56 " C) EXPRESS IN MINUTES AND SECONDS (1' = 60") : 0 ' 49.56 " D) ADD TO STARTING LATITUDE: 79 ° 35 ' 0.00 " + 0 ' 49.56 SITE LONGITUDE: 79 ° 35 ' 49.56 " 79.5971 ° INVESTIGATOR: Matt Gamble DATE: 10/25/2010 C:\Documents and Settings\jmgamble.DWMNET\My Documents\SERB ProjectsVSTALEY TCE WELLS\NC Superfund InvestigationsMnformation and Analysis\Spatial Data\LibertyTCE_WellsLatLongCalcSheet 10/25/2010 79'3730-W 35°4730"N 35*45'0' 35M7'30"N 79'3r30"W W- County Location Map Extent: Randolph County USGS 7,5 Minute Topographic Quadrangle: Liberty Coordinates of approxiinate center of Liberty Town Well Longitude: 79° 35'49.56" Latitude: 35" 47'24,72" 79.5971° 35.7902° Site Location Map Site Name: STALEY TCE WELLS Site Number: NCN 000 410 534 Scale: 1:24,000 Date: October 25, 2010 Figure 1 by: NCDENR DWM Reference 2 Ground Water Use within 4 Miles staley TCE Wells NCN 000 410 534 Pre-CERCLIS Site Assessment, October 27, 2010 Table 1 Groundwater Use within Distance (miles) 0 to 1/4 1/4 to 1/2 1/2 to 1 lto2 2 to 3 3 to 4 Totals 4 Miles Houses 35 55 104 257 552 701 1704 Wells Level 1 Level 1!^ 8 7 1 Other 20 54 104 257 552 701 Population Total 90 141 267 658 1414 1795 4365 Level 1^ 21 0 0 0 0 0 21 Level 11^ 18 3 0 0 0 0 21 Potential Weighted Population " 51 53 138 102 267 52 658 94 1414 212 1795 131 4323 644 Number of houses counted by NC Superfund Section staff from 2007 aerial Imagery of Randolph and Chatham Counties. Each house is assumed to have a well. 2.56 Average houshold size estimate for 2006-2008 by US Census Bureau. ^ Level 1 contamination refers to the presence of PCE at a concentration greater than the reference dose of 1.6 pg/l in drinking w/ater (SCDM July 2009). \evel II contamination refers to the presence of PCE below/the concentration ofthe reference dose of 1.6 pg/l in drinkingwater (SCDM July 2009). ^ Population is the number of houses (wells) times the average household size. " Weighted population value as taken from HRS Final Rule Table 3-12. Page 1 of 1 Prepared by NCDENR Division of Waste Management - Superfund Section Reference 3 Summary of Laboratory Analytical Data And PCE and TCE in Ground Water Map L. staley TCE Wells NCN 000 410 534 PSA October 27, 2010 Table 2 Water Well Sample Summary j Address 6488 Whites Chapel Road, Staleey, NC 27355 6456 Whites Chapel Road, Staley, NC 27355 6466 Whites Chapel Road, Staley, NC 27355 3141 NCHWY49N, Liberty 6533 Whites Chapel Road, Liberty, NC 27355 3139 NC Hwy 49 N., Liberty 6521 Whites Chapel Rd. 6487 Whites Chapel Road 1647 Smith Adkins Road, Liberty, NC 27298 3349 NC Hwy 49, Liberty, NC 27298 3318 NC Highway 49, Liberty, NC 27298 1458 Debora Drive, Liberty, NC 27298 6461 Wites Chapel Rd. 6511 and 6487 Whites Chapel Rd. 6498 Whites Chapel Rd., Staley 6335 Old Staley Road, Staley, NC 27355 3129 NCHWY49N (UBERTY) 3235 NCHwy49N, Liberty 3103 NCHWY49N (UBERTY) 6431 Whites Chapel Rd. 3106 NCHWY49N (UBERTY) 3128 NC HWY 49 N,UBERTy, NC 27298 3212 NC Hwy 49 N, Liberty, NC 27298 6345 and 6347 Goldfield Rd, Uberty, NC 27298 3252 NC Hwy 49 N and 6322 Old Staley Rd 6406 Goldfield Rd., Staley 6377 0ldStaleyRd., Staley 6399 Old Staley Rd., Staley 6398 and 6376 Goldfield Rd. 1 Randolph County Health Department. 2 Pyramid Environmental, Inc. - a private consulting firm hired by 3 USEPA Science and Ecosytem Support Division J - estimated value Q-2 - value is greater than the method detection limit but less tha JDate January 26, 2010 February 9, 2006 March 10, 2010 March 10, 2010 March 3, 2010 March 10,2010 February 9, 2006 March 9, 2010 March 3, 2010 March 3, 20)0 March 3, 2010 March 3, 2010 March 9, 2010 March 9, 2010 March 9, 2010 March 3, 2010 March 10,2010 March 10, 2010 February 9, 2006 March 10, 2010 December 14, 2010 March 10, 2010 March 10, 2010 December 14, 2010 December 14, 2010 December 14, 2010 December 15, 2010 December 14, 2010 December 14, 2010 jSampled By | 1 2 1 1 3 1 2 1 3 3 3 3 1 1 1 3 1 1 2 1 2 1 1 2 2 2 2 2 2 he NC UST Section - Federal Trust Fund Branch to n the reporting limit. Max PCE 1 163 J 37 26.5 15.9 3.6 3.2 3.0 1.9 1.4 1.1 0.22 J, Q-2 0.21 J, Q-2 trace trace trace ND ND ND BQL ND BQL ND ND ND BQL BQL BQL BQL BQL complete investigations Max TCE 0.28 J BQL trace ND ND trace ND 0.16 J ND ND ND ND ND ND ND ND ND BQL ND BQL ND ND ND BQL BQL BQL BQL BQL |otherContam|notes j ,Q-2 ,Q-2 trace MTBE petroleum petroleum petroleum petroleum petroleum petroleum petroleum associated with Brown's Grocery TCE result is from March 3, 2010 sampling by SESD. trace MTBE and PCE in trip blank marked as lab error trace MTBE in trip blank marked as lab error trace MTBE in trip blank marked as lab error sample was out of protocol for temperature, possible lab contaminants MTBE, Acetone sample was out of protocol for temperature, possible lab contaminants MTBE, Acetone trace MTBE in trip blank noted as lab error trace MTBE in trip blank marked as lab error sampled as SW-3 by Pyramid Environmental in Feb 2006 and Dec 2009. trace MTBE In trip blank marked as lab error trace acetone and MTBE marked as lab error this is the replacement well for Brown's Grocery Page 1 of 1 Prepared by NCDENR Division of Waste Management - Superfund Section PCE 0.21 ug/l n n\ Wells Distance rings are drawn from the intersection of NC Hwy 49 and Whites Chapel Road. County location ^ ^ /-* r\r\f\ Base map IS hillshade from 2007 Ldar fnagnry AbSOlUtG SC3i6 1 "D 000 availablefromNCDcpanmeniofTransponaion. di?[ccied (petfoteum compouids present in ^ome welb) Contour interval is 5 feel and is based on 2007 Lidar elevation measurements. V\fell locations estimated from aerial images dated 2007. PCE and TCE in Ground Water Site Name: Staley TCE Wells Site Number: NCP 000 410 534 Figure: PSA Ref. 3 Fig. 1 Date: October 27, 2010 Prepared by: NCDWM Reference 4 February 2010 USEPA Pollution Report Page 1 of 3 U.S. ENVIRONMENTAL PROTECTION AGENCY POLLUTION/SITUATION REPORT Staley PCE Wells - Removal Polrep ,<toar>... c/EFA EMERC5ENCY .RESPONSE l?«.Qi UNITED STATES ENVIRONMENTAL PROTECTION AGENCY Region IV Subject: To: From: Date: POLREP#1 Initial Stalev PCE Wells B462 Staley, NC Latitude: 35.7898799 Longitude: -79.5972790 Kenneth Rhame. OSC 2/23/2010 Reporting Period: 2/23/2010 to 4/14/2010 1. Introduction 1.1 Background Site Number: B462 D.O. Number: Response .Authority': CERCL.A Response Lead: EP.A NPL Status: Non NPL Mobilization Date: 2/23/2010 Demob Date: CERCLIS ID: ERNS No.: FPN#: Contract Number: .Action .Memo Date: Response Type: Incident Category: Operable Unit: Start Date: Completion Date: RCRIS ID: State Notification: Reimbursable Account #: Emergency Removal Action 2/23/2010 DENR - Superfund 1.1.1 Incident Categorj' US EPA Region 4 conducted a Emergency Response to provide bottled water to residents with potentially impacted wells contaminated with perchloroethylene (PCE). PCE was detected in samples collected by NCDENR and the C'ounl\ Health Dept. 1.1.2 Site Description NCDENR has requested EPA technical assistance in an incident in Staley. NC involving the discoverv of perchloroethylene (PCE) in local residential water supply wells. OSC Rhame responding with ERRS and START to provide bottled water to potentially impacted residents mhtml:file://C:\Documents and Settings\jmgamble.DWMNET.My Documents\SERB Proj... 11/2/2010 Page 2 of 3- and conduct water sampling at private wells. NC DENR and County Health Dept began collecting samples in the community as part of a investigation being conducted related to a abandoned gas station. Brown's E.\.\on, located on NC Hwy 49 and Whites Chapel Road. 1.1.2.1 Location Residential Wells in the vacinity of Whites Chapel Road and NC Hwy 49. 1.1.2.2 Description of Threat Samples collected by NC DENR and the County Health Department indicate concentrations of PCE above the removal action level of (12 ppb). 1.1.3 l*reliminary Removal As.se.ssment/Removal Site Inspection Results NC DENR and County Health Dept. detected PCE in the residential well samples up to 67.9 ppb. EPA lo.xicologist have reviewed the data and recommended that the EPA Emergency Response and Removal Branch (ERRB) provide bottled water to the residents exceeding MCLs until EPA data could be collected confirming the state and county data. Current .\ctivities 2.1 Operations Section 2.1.1 Narrative On 2/24/2010 EPA delivered water to the residents exceeding MCLs and RALs. Residents that exceeded the RALs were given guidance to reduce exposures, ranging from not using the water lo limiting bathing times and venting with open windows or fan during bathing etc. Bottled water will continue to be provided until EPA collects and confirms the data. ATSDR has been contacted and requested to consult with residents having impacted wells. 2.1.2 Response .Actions to Date HP.A confirmed NC Di-NR and County Health Dept. data indicating that RALs for PCE was exceeded. l:P.As results showed PCI: in concentrations up to 150 ppb. Water filtration systems were installed on 3,''21 and completed on 3/22. The resident having the highest concentrations (15o ppbj icl'uscd to allow EPA lo install a vvater filtration unit. This resident was advised ofthe dangers involved with continuing to use the well water. This resident wanted EPA to construct another well. EPA consulted with teclinical advisors that advised against installation of new wells due lo the geology ofthe area and the chemical characteristics of PCE. it is unlikely that a new well would resolve the exposure long lerm. All residents remain on bottled water being provided by HP.A until samples can be collected and analyzed from the filters indicating that the filters are working properly. EPA continues lo provide bottled w alcr and lo discuss the desire to install a filter for the resident having the highest concenlralion (150 ppb) PCE. 2.1.3 Enforcement .Activities. Identity' of Potentially Responsible Parties (PRPs) No responsible parties have yet been identified. 2.1.4 Progress Metrics Waste Stream Medium Quantity Manifest # Treatment Disposal mhiml:filc:/.C:\Documcnls and Scllings\jmgamble.DWMNFr<My Documents\SERB Proj... 11/2/2010 Page 3 of 3 2.2 Planning Section 2.2.1 Anticipated Activities Addtional Sampling is needed to insure all impacted wells have t)een identified. 2.2.1.1 Planned Response Activities Continue to discuss the need for a filter to be installed at the resident that refused the EPA Filter Agreement. 2.2.1.2 Next Steps Maintain Filters for 1 year. Sample Filters Quarterly. Attempt to Identify Source (PRP). Identify other potentially impacted homes. 2.2.2 Issues Resident Denying EPA Filter Installation 2.3 Logistics Section 2.4 Finance Section 2.5 Safety Officer 2.6 Liaison Officer 2.7 Information OfTicer 3. Participating Entities 3.1 Unified Command 3.2 Cooperating and Assisting Agencies 4. Personnel On Site 5. Definition of Terms 6. Additional sources of information 6.1 Internet location of additional information/reports 6.2 Reporting Schedule 7. Situational Reference Materials mhtml:file://C:\Documents and Settings^jmgamble.DWMNETVMy Documents\SERB Proj... 11/2/2010 PRE-CERCLIS SCREENING ASSESSMENT CHECKLIST/DECISION FORM This checklist can assist the site investigator during the Pre-CERCLIS screening. It will be used to detennine whether further steps in the site investigation process are required under CERCLA. Use additional sheets, if necessary. Checklist Preparer: Site Name: Matt Gamble / Hydrogeologist O'ame/Tiilc) 401 Oberlin Road. Raleigh. North Carolina (Address) matt. gamble(fl).ncmail .net (E-Mail Address) Stalev TCE Wells 10/26/2010 (Date) 919-508-8487 (Phone) Previous Names (if any): Site Location: Latitude; •'35.7902 ° 6488 Whites Chapel Road (Slrcel) Stalev. Randolph County (City) Longitude; 19.597'l ^ Nonh Carolina 28173 (ST) (Zip) Complete the following checklist. IfAyes^ is marked, please explain below. 1. Does the site already appear in CERCLIS? 2. Is the release from products that are pari ofthe structure of and result in exposure within, residential buildings or businesses or communily structures'? i. Does the site consist of a release of a naturally occurring substance in its unaltered form, or altered solely through naturally occurring processes or phenomena, from a location where il is naturally found? 4. Is Ihe release inlo a public or private drinking water supply due lo deterioration of the system through ordinary use? 5. Is some other program aclively involved with the site (i.e., another Federal, Stale, or Tribal program)? 6. Are the hazardous substances potentially released at Ihe site regulated under a statutory exclusion (i.e., petroleum, natural gas. natural gas liquids, synthetic gas usable for fuel, nonnal application of fertilizer, release located in a workplace, naturally occurring, or regulated by the NRC. UMTRCA, or OSHA)? 7. Are the hazardous substances potentially released al the site excluded by policy considerations (e.g., defenal lo RCRA Coneclivc Action)? 8. Is there sufficient documentation that clearly demonstrates that there is no potential for a release that could cause adverse environmental or human health impacts (e.g., comprehensive remedial investigation equivalent data showing no release above ARARs, completed removal action, documentation showing that no hazardous substance releases have occuned, EPA approved risk assessment completed)? YES X X NO X X X X X X Please explain all Aye^ answer(s), attach additional sheets if necessary: Site Determination: X Enter the site into CERCLIS. Further assessment is recommended (explain below). The site is not recommended for placement into CERCLIS (explain below). DECISION/DISCLSSION/RATIONALE: Item 1 The site was entered into CERCLIS as a removal only site during the response of EPA's On-Scene Coordinator's work to sample wells, supply local residents with bottled water and install filter systems on select wells. Item 5, The Randolph County Health Department periodically samples about 15 area wells to monitor the situation. Given the presence of impacted ground water targets, untested targets, and the lack of an altemate water source, the North Carolina Superfund Section recommends that additional work be completed under CERCLA. Although current data is reliable, it was not completed under CLP protocols and contaminant levels have increa.sed over time in some wells: the section therefore recommends that an additional round of sampling be completed. This sampling would confonn to EPA assessment protocol and analyses will be pyerformed by a CLP laboratory. Also. surface water has not yet been .sampled and will be included in the additional sampling. Regional EPA Reviewer: State Agency/Tribe: OJIMLLU^ Ihr'/o 'I'niit Name Sigiiaftjrc C»n7/L€/ i/X7r^i Print Nanjt/Sjgnalure . Date .//yyyjyyyp Date REFERENCE 6 NCDENR North Carolina Department of Environment anci Natural Resources Dexter Matthews, Director Division of Waste Management Beverly Eaves Perdue, Governor Dee Freeman, Secretary October 28, 2010 Ms. Carolyn Callihan Superfund Site Evaluation Section TN A A-rkr>rz)v/^<d US EPA Region IV Waste Division TH Hpp ^ 61 Forsyth Street, 11th Floor U M I I O CPPC Atlanta, GA 30303-3104 ' SI \/^arnxr\-hd Subject: Preliminary Assessment (PA) Staley T^Wells^^T^dC: CERCLlSlDNCNOOO 410 534 6488 Whites Chapel Road Staley, Randolph County, NC 27355 Dear Ms. Callihan: The NC Superfiind Section completed a PA for the above reference site. This PA was performed by the NC Superfimd Section under a cooperative agreement between the EPA and the State of North Carolina. The site is located at 35.7902° north latitude and 79.5971° west longitude, on Whites Chapel Road, southwest of the Town of Staley in Randolph County, NC (Ref 1). The site is the location of a plume of PCE and TCE ground water contamination from an unknown source. Fifteen residential supply wells have been impacted: four of them at concentrations > the MCL for PCE, 5.0 ^g/l (SCDM July 2009). This PA was performed to assess the potential threat to human health and the environment posed by the presence of PCE and TCE in the ground water. The site was brought to the attention of the NC Superfund Section by the Randolph County Health Department. They were contacted by the NC Underground storage tank (UST) program when an investigation at Brovm's Grocery discovered PCE in a water well. PCE is not associated with the petroleum plume at Brovra's Grocery. Potential Sources As mentioned above, there is no known source for the PCE and TCE in the ground water. There are three potential sources: Brown's Grocery, a nearby auto repair shop, and an electrical substation. (Ref 1) 10855323 An Cnii'al Annortiinih; / Affinmotivo Ar^tir>r^ Cmnlcn/cir . ^r\ W. Dar'\rr\ari \ ^^\ 0/, DAC* fnnc.tmar Darior U.S. EPA REGION IV SDMS POOR LEGIBILITY PORTIONS OF THIS DOCUMENT MAY BE DIFFICULT TO VIEW DUE TO THE QUALITY OF THE ORIGINAL. TO MAKE THE DOCUMENT READABLE, TRY ONE OR MORE OF THE FOLLOWING: From the Displays Settings in Windows Control Panel: 1. Set the Color Quality to the highest available: 24 bit or 36 bit. 2. Increase or decrease the Screen resolution. From the iMonitor/Displav Controls: 1. For dark image page, increase the brightness and decrease the contrast. 2. For light image page, decrease the brightness and increase the contrast. ** PLBASB CONTACT THS AfPROPMATH MCOHOS CairrB« TO VIBW THB MATBRIAL** V. 2-040506 Staley TCE Wells NCN 000 410 534 October 28, 2010 Preliminary Assessment Paae2 of5 age 2 of; Brown's Grocery is the location of a petroleum release. The UST Program's Federal Trust Fund Branch is overseeing and financing investigations there. To date several UST's and dispensers have been removed. About 35 cubic yards of petroleum contaminated soil was removed from the site for disposal during the tank removals. Free phase petroleum is present in several monitoring wells at the site. Multi phase extraction is being used to remove free product. Neither PCE nor TCE are associated with the petroleum release. Attribution of the PCE and TCE to the Brown's Grocery is unlikely given current information. There is an auto body repair shop about 250 ft northeast from Brown's Grocery. The water well at the repair shop shows trace concentrations of PCE. However, it is only in 2010 that the PCE has been detected in the well. Samples in 2003 and 2009 did not detected PCE. Additionally, the well there is approximately 750 ft away from the well with the highest PCE concentrations. The PCE contamination cannot be firmly attributed to the repair shop on the basis of currently available infonnation. - There is an electrical substation directly across the street from 6488 Whites Chapel Road. The substation is about Yz acre in size and is completely covered with a layer of gravel. The substation'property is owned by Randolph County Electric Membership Corporation. Although there are no signs of a release at the substation, its proximity to the site is suggestive. Previous Investigations The nearest environmental investigation is at the aforementioned Brown's Grocery. (Ref 2) Twenty-nine drinking water wells have been sampled as a result of petroleum related investigations at Brown's Grocery and monitoring of ground water quality by the Randolph County Health Department. (Ref 4) In February 2010. the NC Superfiind Section requested EPA Regional 4 Emergency Response and Removal Branch (ERRB) to conduct a Removal Site Evaluation at the site. Their evaluation included sampling ten water wells, providing bottled water to residents, and installing water filtration systems. (Ref 4) The NC Superfiind Section is not aware of any other investigation into the PCE and TCE in ground water at the site. Ground Water Pathway The site is located in the Carolina Slate Belt geologic region of the state. Rocks in this region are generally greenshcist grade metamorphic rocks derived from volcanic and sedimentary parent rocks. Topography is characterized by relatively low rolling hills dissected by a dendritic pattern of perennial streams with a stream occurring every few thousand feet on average. Average annual precipitation in the area is 48.2 inches almost all falls as rain. (Ref 5) Precipitation runs off to nearby streams and percolates down into the ground water system. The streams are also recharged by groundwater moving through fractures, along Staley TCE Wells NCN'000 410 534 October 28. 2010 Preliminary Assessment Page 3 of 5 foliation, or bedding planes in the underlying bedrock. Bedrock occurs at about 20 to 30 feet below ground surface on hill tops and at the surface in stream beds. Recharge to the bedrock occurs from the water table aquifer that generally occurs from the mantle of weathered rock overlying the bedrock. This mantle is derived from the in-situ weathering of the underlying rocks on the hilltops and slopes and in the stream beds is fluvial sediments transported from upstream. Hydraulic conductivity can be expected to range over several orders of magnitude from the sediments to the bedrock. Pyramid Environmental completed several slug tests to estimate hydraulic conductivity in the soils overlying bedrock and in the fractured bedrock. They estimated hydraulic conductivity at 0.48 feet/day in the soils and 1.2 feet/day in the bedrock. (Ref2:p. 11) Drinking water wells in the area are generally installed into the bedrock aquifer and draw water from the aforementioned fractures, foliation, and bedding planes. There may be occasional "dug" wells that would extend no deeper than the partially weathered rock that immediately overlies the bedrock. Water to these wells would come from the partially weathered rock and overlying sediments. Table 1 shows the estimated population using ground water as a source of drinking water. As this is a plume from and unknown source, the nearest well is taken as the well with the highest contaminant concentrations: its distance is taken to be 0. There are currently fifteen water wells known to be impacted by PCE and / or TCE. (Ref 3, Figure 1). In summary, the presence of impacted ground water targets shows that the groundwater migration pathway is complete. Continued migration of contaminants along the pathway has the potential to impact additional targets. Surface Water Pathway The site sits atop a high point relative to its surroundings. Surface water flow is radial from the top of the hill. Area hydrography as prepared by the US Geological Survey, suggest that as many as six springs may exist within YA to Yi mile of the site. There is currently no known surface source; so the movement of contaminants over the surface is an unknown possibility. However, groundwater issuing from the springs may contain contaminants. (Ref 6) Although flow is radial away from the site, it all ends up in either Sandy Creek (via tributaries) or Brush Creek. Sandy Creek is classified as WS-lII by the NC Division of Water Quality. This designation means "Waters used as sources of water supply for drinking, culinary, or food processing purposes where a more protective WS-I or II classification is not feasible. These waters are also protected for Class C uses. WS-III waters are generally in low to moderately developed watersheds." There are two surface water intakes along Sandy Creek at about 8 and 8.2 miles downstream from the site; near the town of Ramseur. Brush Creek is classified as Class C. Class C water bodies are defined as: "Waters protected for uses such as secondary recreation, fishing, wildlife, fish consumption, aquatic life propagation, survival and maintenance of biological integrity, and agriculture. Secondary recreation includes wading. Staley TCE Wells NCN 000 410 534 October 28, 2010 Preliminary Assessment Page 4 of5 The NC Natural Heritage Program does not have any endangered species listed that occur along the surface water migration pathway to the 15 mile target distance limit. Soil Exposure and Air Pathway As mentioned earlier there is no identified surface source of the contaminants at this time. The soil and air exposure pathways are unaddressed. Conclusions The Staley TCE Wells site is a plume of PCE ahd TCE moving away fi-om an unknown source. The presence of impact at ground water targets confirms that contamination is moving via the ground water migrafion pathway. The presence of up to six springs within Yz mile of the plume suggests that the surface water migration pathway may also be impacted. The NC Superfund Section recommends that a Site Inspection (SI) be conducted at the site. Infonnation gained from an Sl will support a detailed and accurate HRS score. The SI should be designed to accomplish the following tasks: 1. Obtain a current snapshot of groundwater quality in the area; current groundwater quality data is spread over several years. Complete a sampling event of all drinking water wells within Y* mile of the site. Additionally water wells within Vi mile in the apparent direction of migration should also be sampled. 2. Identify the precise locations of springs. Sample water and sediment at any springs. The NC Superfiind section recommends a phased approaish to the SI. The above water sampling needs to be conducted in November of this year. Some residential wells in the site area are yet untested. Groundwater table elevations are at their lowest this time of year in the southeastern Piedmont. As a result, groundwater contaminant levels tend to be at relatively undiluted, higher, concentrations during this seasoUj as well. The scale and scope of any necessary second phase can be determined after obtaining results from the first phase. If Phase 1 results warrant further work, a second phase would be designed to include at least the following tasks: 3. Identify Source(s). 4. Assess any potential risk related to vapor intrusion. Please indicate your approval or recommended amendments to this PA. You may contact Jim Bateson at 508-8449, orjames.bateson@ncdenr.gov if you have any questions. Sincerely, ^Mf^ - • - mes M. Gamble, P.G., Jifn Bateson, Head, Hydrogeologist Site Evaluation and Removal Branch NC Superfund Section NC Superfiind Section Staley TCE Wells NCN 000 410 534 October 28, 2010 Preliminary Assessment Page 5 of 5 cc: Scott Ross, file References:: 1. Site Location Map and Site Layout Map 2. Brown's Grocery CSA 3. Groundwater Summary and Usage 4. USEPA Pollution Report 5. Cliinate Infonnation 6. Surface Water Pathway Approved by: ' Date: Carolyn Callihan, NC Site Management Section Reference 1 Site Location Map And Site Layout Map 7r3T30-VJ 79'35'0"W aSMffO-N' 35"47'30"N 79"35'0"W w- County Location Map Extent: Randolph County USGS 7.5 Minute Topographic Quadrangle: Liberty Coordinates of approximate center of Liberty Town Well Longitude: 79° 35'49.56" Latitude: 35° 47'24.72" 79.5971° 35.7902° Site Location Map Site Name: STALEY TCE WELLS Site Number: NCN 000 410 534 Scale: 1:24,000 Date: October 25, 2010 Figure by: NCDENR DWM .Q Q PCE > 1.6 ug/l PCE < 1.6 ug/l No chloronated solvents detected Distance rings are drawn from the intersection of NC Hwy 49 and Whites Chapel Road. County location: Absolute Scale 1;D,000 "".lablorromNCDcpaomcniofTransportaiion Not tested Potential Spring .Stream Contour inli^^'ai is 5 feci and ix based on 2007 Lidar elevation mcntiiiTcmcnis. VU;II Incniions cstimalcd fram aerial images dated 2(t07. Site Layout Site Name: Stalcy TCE Wells Site Number: NCD 000410534 Figure: PA Ref. 1 Fig. 2 Dale: October 28, 2010 Prepared by: NCDWM FIGURES : 1. USGS Topographic Map 2. Site Detail Map 3. Water Supply Well and Surrounding Properties Map 4. Potentiometric Surface Map (05-16-2001) 5. Potentiometric Surface Map (11-12-2003) 6. Benzene Isoconcentration Map (11-12-2003 7. Toluene Isoconcentration Map (11-12-2003) 8. Ethylbenzene Isoconcentration Map (11-12-2003) 9. Total Xylenes Isoconcentration Map (11-12-2003) 10. Total BTEX Isoconcentration Map (11-12-2003) 11. MTBE Isoconcentration Map (11-12-2003) 12. Cross-Section Location Map 13. Groundwater Concentration Cross-Section B-B' (Benzene) 14. Groundwater Concentration Cross-Section B-B' ( MTBE) 15. Groundwater Concentration Cross-Section C-C (Benzene) 16. Groundwater Concentration Cross-Section C-C (MTBE ) TABLES: 1. UST Information 2. Summary of Surrounding Properties & Supply Well Information 3. Monitoring Well Construction Details 4. Summary of Groundwater Elevations 5. Summary of Groundwater Analytical Results 6. Summary of Supply Well Analytical Results APPENDICES: A. Geophex : UST Closure Soil Data & Maps B. Risk Characterization Report C. Geophex : Soil Assessment Data & Cross Section A - A' D. Soil Boring logs and Monitoring Well Construction Records E. Standard Field Procedures F. Bail Test Calculations and Forms G. Groundwater Laboratory Results & Chain-of-Custody REFERENCE 7 REFERENCE 8 1646 Mail Service Center, Raleigh, North Carolina 27699-1646 Phone: 919-707-8200 \ Internet: http://portal.ncdenr.org/web/wm An Equal Opportunity \ Affirmative Action Employer – Made in part by recycled paper North Carolina Department of Environment and Natural Resources Pat McCrory Governor John E. Skvarla, III Secretary August 15, 2014 Ms. Carolyn Callihan Superfund Site Evaluation Section US EPA Region IV Waste Division 61 Forsyth Street, 11th Floor Atlanta, GA 30303-3104 Subject: Supplemental Site Inspection Staley PCE Wells CERCLIS ID# NCN 000 410 534 6488 Whites Chapel Road Staley, Randolph County, NC 27355 Sampling Date: Week of May 27, 2014 Dear Ms. Callihan: Enclosed is the Supplemental Site Inspection (SI) report for the above-referenced site. The current investigation was conducted in order to address laboratory analytical data quality issues identified in SI samples collected on site during a May 2011 SI sampling event. This was the second of three SI sampling events involving private domestic drinking water wells conducted at Staley in 2010 and 2011. The Supplemental SI consisted of re-sampling at selected well locations. The scope of the project was based on a comparison of the May 2011 data set with results from previous sampling by US EPA Region 4 and Randolph County Health Department, and SI sampling by NC Superfund in November 2010 and December 2011. Based on the Supplemental SI results, the previous SI recommendation, for no further remedial action planned (NFRAP) status under CERCLA, remains unchanged. Site Location and Description: The site is located adjacent to NC Highway 49, west of Staley in eastern Randolph County, NC (Fig. 1). Site geographic coordinates are 35.7902o north latitude and -79.5971o west longitude. This reference point is at the 4-way intersection of NC Highway 49 with Whites Chapel Road (on the west) and Old Staley Road (on the east) (Figures 2-5). The above-cited site address is that of the most severely contaminated domestic well at the site, approximately 400 feet west-northwest of the intersection. The site is in a semi-rural neighborhood with mixed residential, agricultural and light industrial use. The former Brown’s Grocery store stands vacant at the southern corner of NC Highway 49 and Old Staley Road (Ref.1). Ms Callihan August 15, 2014 Page 2 Site Regulatory and Investigative History: The Staley PCE Wells site contains tetrachloroethene (PCE) groundwater contamination from an unidentified source. Site discovery occurred during the course of a petroleum underground storage tank (UST) pollution investigation at the former Brown’s Grocery. In February 2006, sampling by UST program contractors revealed PCE contamination in five domestic wells along Whites Chapel Road and NC Highway 49. Additional sampling in 2009 and early 2010 revealed a contiguous southwest-oriented cluster of PCE-contaminated residential wells, measuring approximately 0.3 mile long and centered approximately 0.1 mile west of the intersection of Whites Chapel Road and NC Highway 49 (Ref. 1). The maximum detected PCE concentration (163 ug/L) occurred at 6488 Whites Chapel Road. Three additional domestic wells, located at 6456 and 6466 Whites Chapel Road and 3141 NC Highway 49, contained PCE concentrations exceeding the 5 ug/L Maximum Contaminant Level (MCL) and the 12 ug/L EPA Removal Action Level (RAL). In response, the USEPA installed carbon filtration systems at these four domestic wells in 2010 (Ref. 1). Prior to the Supplemental SI, the NC Superfund Section had conducted SI sampling events in November 2010, May 2011 and December 2011 (Table 1, attached). The November 2010 sample results confirmed that the cluster of PCE-contaminated wells was located west of NC Highway 49 and south of Smith Adkins Road. The May 2011 event expanded the areal extent of sampling westward, adding eight domestic wells to further delineate the extent of groundwater contamination (Fig. 2). Based on the May 2011 results, the scope of the December 2011 sampling event was reduced to include fourteen domestic wells. These included eleven wells with previous SI sample PCE concentrations exceeding 0.5 ug/l, and included all four domestic wells equipped by the EPA with carbon filtration units (Refs 1-2). The December 2011 results revealed that PCE concentration had increased above the 5 ug/l MCL at a fifth domestic well, located at 6521 White’s Chapel Road; the NC Inactive Hazardous Sites Branch (IHSB) subsequently equipped this well with a carbon filtration unit, and currently maintains both this unit and three of the four units installed by the EPA. The fourth EPA unit is off line, and use of the well has been discontinued (see below) (Refs. 1-2). Purpose and Scope of Supplemental SI: In early 2014, the EPA Region 4 reported that quality-assurance issues had been identified in the laboratory data generated from the May 2011 SI sampling event (Ref. 3). Concern had arisen that potential inaccuracies in the sample dataset could have resulted in an incomplete contaminant exposure assessment for the well users. In response, NC Superfund Section personnel conducted a comparison between each of the May 2011 sample results and available data from the other two SI sampling events, and/or data generated by previous investigations. Ms Callihan August 15, 2014 Page 3 The May 2011 domestic well SI samples were collected at 40 locations, including pre- and post-filtration at the four wells equipped by EPA with carbon filtration units. At 32 of the May 2011 sample locations, analytical results were consistent with corresponding SI sample results from November 2010 and/or December 2011 (Table 1). At one (pre-filtration) sample location, the May 2011 PCE result was significantly elevated in comparison to the corresponding November 2010 and December 2011 events. At 7 domestic well locations, along Whites Chapel Road and Seays Road, sampling had been conducted only during the May 2011 sampling event; no other historical or SI data were available for comparison. In May 2014, prior to Supplemental SI sampling, NC Superfund Section personnel queried the NC IHSB as to the monitoring and maintenance status for the five wells equipped with carbon filtration units. The IHSB reported that four wells were on continued maintenance schedule, but that the fifth unit, at 3141 NC Highway 49, had been disconnected. The owner at this address reportedly had connected their home to the well at neighboring 3139 NC Highway 49 (Ref. 2). This replacement well currently supplies three homes with drinking water. During the November 2010, May 2011 and December 2011 SI sampling events, PCE concentrations at 3139 NC Highway 49 had ranged from 0.81 ug/L to 1.0 ug/L (Ref. 1). However, the increased water use at the replacement well, combined with its proximity to more highly contaminated wells, indicated that PCE concentrations in the replacement well might increase over time (Ref. 4). Based on the above data comparison and findings, the NC Superfund Section recommended re-sampling the following eight domestic wells: Street address: Re-sampling Number: 5864 White’s Chapel Road ST501GW 6160 White’s Chapel Road ST502GW (and Duplicate) 6244 White’s Chapel Road ST503GW 1242 Seays Road ST540GW 1274 Seays Road ST542GW 1296 Seays Road ST543GW 1324 Seays Road ST544GW 3139 NC Highway 49 ST527GW Supplemental SI Sampling and Results: The NC Superfund Section conducted Supplemental SI sampling on May 28, 2014. The property owner at 1242 Seays Road declined (by telephone, on May 16) to participate in this sampling event; all of the remaining 7 samples were collected (Refs. 4-5). Staley PCE Wells Supplemental Site Inspection References 1) Parker, Stuart F., Hydrogeologist, NCDENR, Superfund Section. Site Inspection Report, Staley PCE Wells Site, CERCLIS ID# NCN 000 410 534, Staley, Randolph County, North Carolina. September 21, 2012. 2) Antrilli, Vincent, NCDENR, Bernard Allen Program Manager, NCDENR Superfund Section. Electronic communication on May 6, 2014. 3) Hill, Franklin, Director, USEPA Region 4, Letter to Dexter Matthews, Director, NC DENR Division of Waste Management, May 21, 2014. 4) Parker, Stuart F., Hydrogeologist, NCDENR, Superfund Section. Sampling and Analysis Plan/ Quality Assurance Project Plan: Staley PCE Wells Site, CERCLIS ID# NCN 000 410 534, Staley, Randolph County, North Carolina. May 8, 2014. 5) Parker, Stuart F., Hydrogeologist, NCDENR, Superfund Section. Supplemental Site Inspection Sampling Field Notes, May 28, 2014. REFERENCE 9 S&ME, Inc. | 3201 Spring Forest Road | Raleigh, NC 27616 | p 919.872.2660 | f 919.876.3958 | www.smeinc.com August 24, 2016 North Carolina Department of Environmental Quality Division of Waste Management, Superfund Section, Inactive Hazardous Sites Branch 1646 Mail Service Center Raleigh, North Carolina 27699-1646 Attention: Ms. Bonnie Ware, P.G. Email: bonnie.ware@ncdenr.gov Reference: Soil Vapor Assessment Staley PCE/Brown's Grocery Liberty, North Carolina NC ID: NCN000410534 S&ME Project No. 4305-16-017 Dear Ms. Ware: S&ME, Inc. (S&ME) is submitting this Soil Vapor Assessment Report for assessment activities conducted at five residential properties located at 3349 NC Highway 49 North and 6533, 6521, 6498, and 6488 Whites Chapel Road in Liberty, Randolph County, North Carolina (Attachment I, Figure 1). Our services were performed in general accordance with S&ME’s Sampling and Analysis Plan (SAP)/Fee Proposal (S&ME Proposal No. 43-1600124, REV-1) dated March 1, 2016. The SAP and fee proposal was approved by Mr. Bruce Lefler of the NCDEQ, IHSB in a Task Authorization dated April 4, 2016. All services were conducted under the terms and conditions of Contract #N14009i, dated September 26, 2014. This report presents the purpose for the sampling event, the methods used to collect soil vapor samples, the results of the laboratory analyses, and the conclusions based on the results of the analyses.  Project Background and Purpose The five assessed properties are located downgradient from a former gas station (Brown’s Grocery) location with confirmed groundwater contamination (volatile organic compounds (VOCs) and semi- volatile organic compounds (SVOCs)) and also located near an automotive repair and sales business. Previous water supply well investigations revealed the presence of tetrachloroethene (PCE) and 1‐2 dichloroethane (1‐2DCA) in groundwater in excess of applicable residential groundwater screening levels for vapor intrusion pathway. The IHSB requested that S&ME perform soil vapor sampling at the five residential properties to further investigate the potential for vapor intrusion.  Scope of Services In accordance with the IHSB request and the approved SAP, the scope of services conducted consisted of the collection of five soil vapor samples to assess for potential vapor intrusion into five residential properties located at 3349 NC Highway 49 North and 6533, 6521, 6498, and 6488 Whites Chapel Road. A soil vapor sample was not collected at 3318 NC Highway 49 North, as a signed Property Access Soil Vapor Assessment Staley PCE, Liberty, Randolph County, NC NC ID: NCN000410534 S&ME Project No. 4305-16-017 August 24, 2016 2 Agreement could not be obtained for this property. This report presents the field methods of the assessment conducted, the laboratory analytical results of the soil vapor samples that were collected and comparison to applicable screening levels, and conclusions.  Methods Health and Safety Plan S&ME prepared a site-specific Health and Safety Plan (HASP) in general accordance with 29 CFR 1910.120, which addressed the contaminants known or suspected to be present on-site, personal protective equipment, monitoring performed during the field activities, and response actions to be taken in the event monitoring thresholds are exceeded. To mitigate the potential for damage to underground utilities, S&ME contacted NC One Call and retained the services of a private utility locating service (KCI Technologies) to avoid damaging underground utilities at the boring locations for the soil vapor samples. Soil Vapor Sampling On May 9, 2016, S&ME personnel conducted the soil vapor sampling 3349 NC Highway 49 North and 6533, 6521, 6498, and 6488 Whites Chapel Road. S&ME subcontracted Quantex, Inc. to install the soil gas implants (SGIs) with a Geoprobe® drill rig using direct push technology. Using push rods, five SGIs (SGI-1 through SGI-5) were installed at the locations shown on Figure 2 (Attachment I). Each SGI was installed at an approximate depth of eight feet below ground surface (bgs). After advancing the rods and installing the SGI, the annular space between the SGI and boring wall was filled with glass bead filter media to approximately two inches above the top of the SGI screen. Granular bentonite was then placed above the glass bead filter pack in lifts of approximately six-inches, and hydrated with deionized water between bentonite lifts, until each boring was filled to the ground surface. The bentonite was then allowed to hydrate for approximately one hour prior to sampling. The locations of the sampling points were recorded using a Trimble® handheld GPS unit with sub-meter accuracy. The coordinates of each sample location are listed in Table 1 in Attachment II. A photograph log is included in Attachment III. The construction records for each SGI are included in Attachment II, Table 2. The sampling locations are shown on Figure 2 in Attachment I. Following the SGI installations, S&ME performed a leak test on each SGI sampling apparatus by attaching a brass T-connector to the SGI sample tubing and using Teflon® tubing to connect one end of the T- connector to a batch-certified six liter summa canister with 1-hour regulator. Tubing was then connected to the other side of the T-connector, fitted through a plastic shroud placed over the SGI tubing and summa canister, and attached to a helium gas detector. Helium gas was then injected into the plastic shroud. The SGI sampling array was monitored for leaks by monitoring for the presence of helium gas within the tubing. Each SGI sampling array was considered leak-free as helium gas was not detected. After successfully passing the leak test, three volumes of air were purged from the SGI sampling array using a calibrated low-flow pump at a rate of approximately 100 milliliters per minute. After purging the sampling array, the summa canister valve was opened for approximately one hour to allow the collection of a soil vapor sample. Soil Vapor Assessment Staley PCE, Liberty, Randolph County, NC NC ID: NCN000410534 S&ME Project No. 4305-16-017 August 24, 2016 3 After the samples were collected, the summa canisters were shipped under standard chain-of-custody protocol to ESC Lab Sciences of Mt. Juliet, Tennessee, a North Carolina Certified laboratory, for analysis. The samples were analyzed for the following VOCs by EPA Method TO-15: tetrachloroethene (PCE) and PCE daughter products (trichloroethylene, cis- and trans-1,2-dichloroethene, 1,1-dichloroethene, and vinyl chloride), and 1,2-DCA. The field sampling forms are included in Attachment III. Prior to leaving the site, the tubing was removed and the boreholes were filled with a mixture of soil and bentonite clay. Quality Assurance/Quality Control S&ME collected one duplicate sample (DUPLICATE) of sample SGI-1 for Quality Assurance/Quality Control (QA/QC) purposes. The QA/QC sample was analyzed for the same VOC constituents as the record sample by Method TO-15. S&ME personnel were onsite to maintain chain-of-custody and to monitor the vacuum on each flow regulator. In accordance with S&ME’s sampling protocol and the DWM Gas Intrusion Guidance (April 2014), the vacuum in each Summa canister was not allowed to reduce to zero inches of mercury (inches-Hg).  Results Soil Vapor Sampling Results Due to apparent clayey soil conditions, the Summa canisters used to collect soil vapor samples SGI-3 and SGI-5 were not able to draw sufficient volumes of soil vapor for laboratory analysis. The vacuum at SGI-3 fell to 25 inches-Hg and the vacuum at SGI-5 fell to 19 inches-Hg. The target vacuum is less than approximately five inches-Hg. Soil vapor samples SGI-1 and DUPLICATE had reported concentrations of PCE above the laboratory method analytical limit but below the IHSB Soil Gas Screening Levels (SGSLs). Soil vapor sample SGI-2 had a reported concentration of vinyl chloride above the laboratory method analytical limit but below the SGSL. The laboratory analytical results for the soil vapor samples collected during the May 2016 sampling event are presented in Table 3 in Attachment II and summarized on Figure 2 in Attachment I. A copy of the laboratory analytical report and chain-of-custody is provided in Attachment IV. Quality Assurance/Quality Control Results Analytical results of the duplicate sample (DUPLICATE) agreed well with the record sample (SGI-1) results.  Conclusions Based on the soil vapor sampling results from the May 2016 sampling event, the following conclusions are presented: 1. The laboratory analytical results of the soil vapor sample SGI-1 indicate PCE was present in the sample at a concentration greater than the laboratory analytical method limit, but less than the PCE Residential SGSL of 278 µg/m3. Attachments Attachment I - Figures DATE: DRAWN BY: 3201 SPRING FOREST RD, RALEIGH, NC 27616 NC ENGINEER LICENSE #F-0176 SCALE: PROJECT NO: FIGURE NO. WWW.SMEINC.COM STALEY PCE / BROWNS GROCERY - NCN000410534 LIBERTY, NORTH CAROLINA 1" = 2000' BTR JUNE 2016 4305-16-017 1 A-5955 VICINITY MAP 2000 4000 (IN FEET)GRAPHIC SCALE 0 (IN FEET)GRAPHIC SCALE Q:\PROJECTS\2016\4305-16-017\CAD\A5955.dwg, FIG1, 6/14/2016 9:23:14 AM, 1:1 PROJECT NUMBER: DATE:FIGURE NO.SCALE: DRAWN BY: CHECKED BY:DRAWING NUMBER:WWW.SMEINC.COM 3201 SPRING FOREST RD, RALEIGH, NC 27616 NC ENGINEER LICENSE #F-01762 BTR4305-16-017 JUNE 20161" = 100' STALEY PCE / BROWNS GROCERY - NCN000410534 LIBERTY, NORTH CAROLINA SAMPLE RESULTS MAP B-2604100200 (IN FEET)GRAPHIC SCALE0 (IN FEET)GRAPHIC SCALEQ:\PROJECTS\2016\4305-16-017\CAD\B2604.dwg, FIG2, 6/14/2016 11:01:15 AM, 1:1 Attachment II – Tables Address Sample ID Northing Easting Latitude Longitude 6498 Whites Chapel Road SG-1/DUPLICATE 742,926.540 1,822,971.694 35.789829 -79.596922 6488 Whites Chapel Road SG-2 742,981.370 1,822,896.007 35.789978 -79.597179 6521 Whites Chapel Road SG-3 743,126.212 1,823,230.956 35.790382 -79.596052 6533 Whites Chapel Road SG-4 743,075.477 1,823,389.555 35.790245 -79.595516 3349 Highway 49 North SG-5 743,266.314 1,823,582.899 35.790772 -79.594868 Notes: Sample locations are in feet in the North Carolina State Plane Coordinate System (NAD83). Latitude and longitude are reported in decimal degrees.Latitude and longitude are reported in decimal degrees. S&ME Project No. 4305-16-017 TABLE 1 Sample Location Coordinates Staley PCE/Brown's Grocery Liberty, Randolph County, North Carolina Site ID: NCN000410534 Address Sample ID Date Installed Boring Diameter (inches) Total Depth (ft-bgs) Implant Placement Depth (ft-bgs) 6498 Whites Chapel Road SGI-1/DUPLICATE 5/9/2016 2 10.0 8.0 6488 Whites Chapel Road SGI-2 5/9/2016 2 10.0 8.0 6521 Whites Chapel Road SGI-3 5/9/2016 2 10.0 8.0 6533 Whites Chapel Road SGI-4 5/9/2016 2 10.0 8.0 3349 Highway 49 North SGI-5 5/9/2016 2 10.0 8.0 Notes: ft-bgs = feet below ground surface Liberty, Randolph County, North Carolina Site ID: NCN000410534 S&ME Project No. 4305-16-017 TABLE 2 Soil Gas Implant Installation Details Staley PCE/Brown's Grocery Sample ID Date Collected 6498 Whites Chapel Road SGI-1 5/9/2016 ND ND 15.8 ND ND 6498 Whites Chapel Road DUPLICATE (at SGI-1)5/9/2016 ND ND 18.8 ND ND 6488 Whites Chapel Road SGI-2 5/9/2016 ND ND ND ND 2.29 6521 Whites Chapel Road SGI-3*5/9/2016 NA NA NA NA NA 6533 Whites Chapel Road SGI-4 5/9/2016 ND ND ND ND ND 3349 Highway 49 North SGI-5*5/9/2016 NA NA NA NA NA NE NE 278 13.9 76.8 NE NE 3,500 175 2790 Notes: µg/m3: micrograms per cubic meter. Constituents in Bold were reported at concentrations above the DWM Vapor Intrusion Residential SGSLs. SGSL: Division of Waste Management Vapor Intrusion Soil Gas Screening Levels (September 2015 ). NE: SGSL not established ND: Constituent not reported above the method's detection limit. NA: Not Analyzed. * : Insufficient sample collected for laboratory analysis. Residential SGSL Non-Residential SGSL cis-1,2-Dichloroethene trans-1,2-Dichloroethene Tetrachloroethylene Address TABLE 3 Soil Vapor Sample Analytical Results Summary Staley PCE/Brown's Grocery Liberty, Randolph County, North Carolina Site ID: NCN000410534 S&ME Project No. 4305-16-017 Trichloroethylene Vinyl chloride Analyte Volatile Organic Compunds by Method TO-15 (µg/m3) Attachment III – Field Report Hours Billed Millage Billed Signature of S&ME Personnel 14.25 hrs 194 S&ME, Inc. | 44 Buck Shoals Road, Ste C-3 | Arden, NC 28704 | p 828.687.9080 | f 828.687.8003 |www.smeinc.com Environmental Field Report Date: May 9, 2016 Job Number: 4035-16-017 Project Name: Staley TCE, ID: NCN000410534 Weather/Temperature: Cloudy,79°F Project Location: Liberty, North Carolina Notes By: ☒ ☐ Present at the Site: Bradley Keyse (S&ME) Darren Cox (S&ME) Quantex (Driller: Mike Allen) On May 9, 2016, S&ME personnel, Mr. Bradley Keyse and Mr. Darren Cox visited the IHS-Staley TCE project (NCDEQ Site ID NCN000410534) to conduct a limited soil vapor assessment. At 09:00 hrs, S&ME arrived to the subject property to find Mr. Carl Whitlow, a private utility locator with KCI Technologies, Inc. (KCI) and Mr. Mike Allen, driller with Quantex Environmental Drilling and Probing (Quantex). All borings were cleared of underground utilities and a tailgate safety meeting was conducted prior to starting the drilling services. From 09:30 hrs to 14:15, Quantex installed five (5) soil gas implants (SGIs) on the following properties using a track mounted Geoprobe and a macro-core sampler: ♦SGI-1: 6498 Whites Chapel Road,Liberty,NC,27298 ♦SGI-2: 6488 Whites Chapel Road,Liberty,NC,27298 ♦SGI-3: 6521 Whites Chapel Road,Liberty,NC,27298 ♦SGI-4: 6533 Whites Chapel Road,Liberty,NC,27298 ♦SGI-5:3349 Highway 49 North,Liberty,NC,27298 Prior to installing the SGIs,S&ME assessed the depth to groundwater in an offset boring by collecting soil profiles in 5-foot intervals using direct push techniques with a Macro-Core®sampler.The Macro-Core®sampler was advanced to a depth of 10 feet below ground surface (bgs).Groundwater was not encountered within 10 feet bgs on any of the properties.The typical soil profile observed in the borings consisted of red silty clay to an approximate depth of 7 feet bgs underlain by orange tan sandy silts with clay to a depth of 10 feet bgs (termination of each offset boring).Each SGI,with the exception of SGI-1,was installed between the water supply well and the residential structure on each property. Using a Macro-Core®sampler the SGI sampling tool was installed to a depth of approximately eight feet bgs.Following installation,S&ME performed a leak test by attaching a brass T-connector to the end of the Teflon®sample tubing and used to connect an individually certified six liter Summa canister to one end of the T-connector and a helium detector to the other end of the T-connector.Prior to connecting the helium detector,a plastic shroud was placed over the SGI sampling array and Summa canister.The open section of tubing from the T-connector was fitted through the shroud and attached to the helium detector.S&ME then injected helium gas into the plastic shroud to concentrations ranging from 16.6%to 24.6%. Equipment Used MGD-2002 Helium Detector (Rental) GPS IHS- Staley TCE Site ID NCN000410534 S&ME Project No. 4035-16-017 The sampling array was monitored for leaks by monitoring for the presence of helium within the tubing. All the sampling arrays passed the helium leak tests. The helium detector was used to purge three volumes of air from the sampling arrays. After purging the sampling arrays, the valve to the six-liter Summa canisters were opened to allow the collection of a soil gas sample. One duplicate sample was collected with record sample SGI-1 and analyzed for the same constituents as the record samples. Collected samples were shipped under standard chain-of-custody protocol to a North Carolina Certified laboratory (ESC Lab Sciences in Mt. Juliet, Tennessee) for analysis. The samples were analyzed for the following VOCs by EPA Method TO-15: PCE and PCE daughter products (trichloroethylene, cis- and trans- 1,2-dichloroethene, 1,1-dichloroethene, and vinyl chloride), and 1,2-DCA. After the soil vapor samples are collected, S&ME removed the top portion of the SGI tubing from approximately one foot bgs and filled the remaining borehole with soil (note: the lower borehole contains hydrated bentonite clay). Attachments: Site Map Field Sampling Form Chain-of-Custody Site Photographs 1 of 2 Total Tubing (ft) Screen Zone (in) Total Tubing (ft) Screen Zone (in) Total Tubing (ft) Screen Zone (in) Total Tubing (ft) Screen Zone (in) Total Tubing (ft) Screen Zone (in) 13 12 13 12 10 12 11 12 11 12 Notes:SGI-1 was collected at 6498 White Chapel Rd SGI-3 was collected at 6521 White Chapel Rd Time Stamp:5/9/2016 20:42 SGI-2 was collected at 6488 White Chapel Rd SGI-4 was collected at 6533 Hwy 49 North Duplicate was collected with SGI-1 Helium Detector Serial No.:41419 Calibration Date:5/2/2016 B. Keyse Sampler Signature Sampler Information Sampled by B. Keyse B. Keyse B. Keyse B. Keyse Flow rate (mL/min)75 75 21 14 71 Final Vacuum (in Hg)2 4 5 25 3 End Time 1200 1200 1433 1646 1405 1320 Initial Vacuum (in Hg)27 28 28 27 30 Sample Collection Start Time 1120 1120 1143 1229 705 Total Purge Time (min)6.1 6.1 5.8 5.9 5.9 Enter SGI Cons. Details → Volume (x3) (mL)732 732 691 705 18.3 He Detected (y or n)Yes Yes Yes Yes Yes Leak Test/ Purge He Concentration (%)16.6 16.6 17.4 24.6 Barometric Pressure (in.)30.08 30.08 30.08 30.09 30.06 Ambient Temp (°F)72 72 75 76 78 Canister Volume (L)6 6 6 6 6 Regulator ID 649 432 644 517 415 Canister ID 849 979 1003 1205 1720 Soil Gas Implant Sample ID SGI-1 Duplicate SGI-2 SGI-3 SGI-4 Sample Information Sample Type Soil Gas Implant Soil Gas Implant Soil Gas Implant Soil Gas Implant Weather: Cloudy, 72 °F S&ME Personnel Present: Bradley Keyse and Summers Long Additional Persons Present: Michael Allen (Quantex-Driller) Project Name/Project Number: IHS-Staley / 4305-16-017, ID: NCN000410534 SGI SAMPLING FIELD FORMLocation: Highway 49 North Liberty North Carolina Date: 5/9/2016 2 of 2 Total Tubing (ft) Screen Zone (in) Total Tubing (ft) Screen Zone (in) Total Tubing (ft) Screen Zone (in) Total Tubing (ft) Screen Zone (in) Total Tubing (ft) Screen Zone (in) 11 12 Notes:SGI-5 was collected at 3349 Hwy 49 North Time Stamp:5/9/2016 20:42 11 12 Regulator ID Canister Volume (L) Ambient Temp (°F) Barometric P (in. Hg) Total Purge Time (min) 20.2 Yes 1428 29Initial Vacuum (in Hg) Final Vacuum (in Hg) Start Time He Detected (y or n) Volume (x3) (mL)705 0 0 Soil Gas ImplantSample Type Enter SGI Cons. Details → He Concentration (%) 79 30.07 SGI-5 1769 395 6 Sample ID Canister ID Project Name/Project Number: Date: Weather: S&ME Personnel Present: Additional Persons Present: IHS-Staley / 4305-16-017, ID: NCN000410534 Highway 49 North Liberty North Carolina 5/9/2016 Cloudy, 72 °F Bradley Keyse and Summers Long Michael Allen (Quantex-Driller) Location: Sample Information Leak Test/ Purge 41419 5/2/2016 Sampled by Sampler Signature #DIV/0!Flow rate (L/min) Sampler Information End Time B. Keyse 29 1635 #DIV/0! 00 Helium Detector Serial No.:Calibration Date: 5.9 0.0 0.0 0.0 0.0 #DIV/0!#DIV/0! Sample Collection 19 SGI SAMPLING FIELD FORM Staley PCE/Brown's Grocery Site Liberty, Randolph County, North Carolina State ID NCN000410534 S&ME Project #: 4305-16-017 3201 Spring Forest Road Raleigh, North Carolina 27616 Date: 5-9-16 Photographer: BK 1 Location / Orientation 6498 Whites Chapel Road Remarks View of SGI-1 and water supply well locations. Date: 5-9-16 Photographer: BK 2 Location / Orientation 6488 Whites Chapel Road Remarks View of SGI-2 and water supply well locations. Water Supply Well SGI-1 / Duplicate Water Supply Well SGI-2 Staley PCE/Brown's Grocery Site Liberty, Randolph County, North Carolina State ID NCN000410534 S&ME Project #: 4305-16-017 3201 Spring Forest Road Raleigh, North Carolina 27616 Date: 5-9-16 Photographer: BK 3 Location / Orientation 6521 Whites Chapel Road Remarks View of SGI-3 and water supply well locations. Date: 5-9-16 Photographer: BK 4 Location / Orientation 6533 Whites Chapel Road Remarks View of SGI-4 and water supply well locations. Water Supply Well SGI-3 Water Supply Well SGI-4 Staley PCE/Brown's Grocery Site Liberty, Randolph County, North Carolina State ID NCN000410534 S&ME Project #: 4305-16-017 3201 Spring Forest Road Raleigh, North Carolina 27616 Date: 3-29-16 Photographer: BK 5 Location / Orientation 3349 Highway 49 North Remarks View of SGI-5 and water supply well locations. Water Supply Well SGI-5 Attachment IV – Laboratory Reports ANALYTICAL REPORT May 13, 2016 S&ME Inc. - Raleigh NC Sample Delivery Group:L834788 Samples Received:05/11/2016 Project Number:4302-16-017 Description:Staley PCE (IHSB Site) Report To:Jason Volker 3201 Spring Forest Road Raleigh, NC 27616 Entire Report Reviewed By: May 13, 2016 [Preliminary Report] Tom Mellette Technical Service Representative Results relate only to the items tested or calibrated and are reported as rounded values. This test report shall not be reproduced, except in full, without written approval of the laboratory. Where applicable, sampling conducted by ESC is performed per guidance provided in laboratory standard operating procedures: 060302, 060303, and 060304. 12065 Lebanon Rd Mount Juliet, TN 37122 615-758-5858 800-767-5859 www.esclabsciences.com May 13, 2016 Tom Mellette Technical Service Representative ONE LAB. NATIONWIDE.TABLE OF CONTENTS ¹Cp: Cover Page 1 ²Tc: Table of Contents 2 ³Ss: Sample Summary 3 ⁴Cn: Case Narrative 4 ⁵Sr: Sample Results 5 SG1-1 8 FT L834788-01 5 SG1-2 8 FT L834788-02 6 SG1-4 8 FT L834788-04 7 DUPLICATE 8 FT L834788-06 8 ⁶Qc: Quality Control Summary 9 Volatile Organic Compounds (MS) by Method TO-15 9 ⁷Gl: Glossary of Terms 11 ⁸Al: Accreditations & Locations 12 ⁹Sc: Chain of Custody 13 1 Cp 2Tc 3Ss 4Cn 5Sr 6Qc 7Gl 8Al 9Sc ACCOUNT:PROJECT:SDG:DATE/TIME:PAGE: S&ME Inc. - Raleigh NC 4302-16-017 L834788 05/13/16 14:59 2 of 14 ACCOUNT:PROJECT:SDG:DATE/TIME:PAGE: S&ME Inc. - Raleigh NC 4302-16-017 L834788 05/13/16 17:51 2 of 14 ONE LAB. NATIONWIDE.SAMPLE SUMMARY Collected by Collected date/time Received date/time SG1-1 8 FT L834788-01 Air Bradley Keyse 05/09/16 12:00 05/11/16 09:00 Method Batch Dilution Preparation Analysis Analyst date/time date/time Volatile Organic Compounds (MS) by Method TO-15 WG871908 1 05/12/16 23:47 05/12/16 23:47 MBF Collected by Collected date/time Received date/time SG1-2 8 FT L834788-02 Air Bradley Keyse 05/09/16 14:33 05/11/16 09:00 Method Batch Dilution Preparation Analysis Analyst date/time date/time Volatile Organic Compounds (MS) by Method TO-15 WG871908 1 05/13/16 00:36 05/13/16 00:36 MBF Collected by Collected date/time Received date/time SG1-4 8 FT L834788-04 Air Bradley Keyse 05/09/16 14:05 05/11/16 09:00 Method Batch Dilution Preparation Analysis Analyst date/time date/time Volatile Organic Compounds (MS) by Method TO-15 WG871908 1 05/13/16 01:23 05/13/16 01:23 MBF Collected by Collected date/time Received date/time DUPLICATE 8 FT L834788-06 Air Bradley Keyse 05/09/16 00:00 05/11/16 09:00 Method Batch Dilution Preparation Analysis Analyst date/time date/time Volatile Organic Compounds (MS) by Method TO-15 WG871915 1 05/12/16 11:20 05/12/16 11:20 SNH 1 Cp 2Tc 3Ss 4Cn 5Sr 6Qc 7Gl 8Al 9Sc ACCOUNT:PROJECT:SDG:DATE/TIME:PAGE: S&ME Inc. - Raleigh NC 4302-16-017 L834788 05/13/16 14:59 3 of 14 ACCOUNT:PROJECT:SDG:DATE/TIME:PAGE: S&ME Inc. - Raleigh NC 4302-16-017 L834788 05/13/16 17:51 3 of 14 ONE LAB. NATIONWIDE.CASE NARRATIVE All sample aliquots were received at the correct temperature, in the proper containers, with the appropriate preservatives, and within method specified holding times. All MDL (LOD) and RDL (LOQ) values reported for environmental samples have been corrected for the dilution factor used in the analysis. All Method and Batch Quality Control are within established criteria except where addressed in this case narrative, a non-conformance form or properly qualified within the sample results. By my digital signature below, I affirm to the best of my knowledge, all problems/anomalies observed by the laboratory as having the potential to affect the quality of the data have been identified by the laboratory, and no information or data have been knowingly withheld that would affect the quality of the data. [Preliminary Report] Tom Mellette Technical Service Representative 1 Cp 2Tc 3Ss 4Cn 5Sr 6Qc 7Gl 8Al 9Sc ACCOUNT:PROJECT:SDG:DATE/TIME:PAGE: S&ME Inc. - Raleigh NC 4302-16-017 L834788 05/13/16 14:59 4 of 14 Tom Mellette Technical Service Representative ACCOUNT:PROJECT:SDG:DATE/TIME:PAGE: S&ME Inc. - Raleigh NC 4302-16-017 L834788 05/13/16 17:51 4 of 14 ONE LAB. NATIONWIDE.SAMPLE RESULTS - 01 L834788 SG1-1 8 FT Collected date/time: 05/09/16 12:00 Volatile Organic Compounds (MS) by Method TO-15 CAS #Mol. Wt.RDL1 RDL2 Result Result Qualifier Dilution Batch Analyte ppbv ug/m3 ppbv ug/m3 1,1-Dichloroethene 75-35-4 96.90 0.200 0.793 ND ND 1 WG871908 1,2-Dichloroethane 107-06-2 99 0.200 0.810 ND ND 1 WG871908 cis-1,2-Dichloroethene 156-59-2 96.90 0.200 0.793 ND ND 1 WG871908 trans-1,2-Dichloroethene 156-60-5 96.90 0.200 0.793 ND ND 1 WG871908 Tetrachloroethylene 127-18-4 166 0.200 1.36 2.32 15.8 1 WG871908 Trichloroethylene 79-01-6 131 0.200 1.07 ND ND 1 WG871908 Vinyl chloride 75-01-4 62.50 0.200 0.511 ND ND 1 WG871908 (S) 1,4-Bromofluorobenzene 460-00-4 175 60.0-140 101 WG871908 1 Cp 2Tc 3Ss 4Cn 5Sr 6Qc 7Gl 8Al 9Sc ACCOUNT:PROJECT:SDG:DATE/TIME:PAGE: S&ME Inc. - Raleigh NC 4302-16-017 L834788 05/13/16 14:59 5 of 14 ACCOUNT:PROJECT:SDG:DATE/TIME:PAGE: S&ME Inc. - Raleigh NC 4302-16-017 L834788 05/13/16 17:51 5 of 14 ONE LAB. NATIONWIDE.SAMPLE RESULTS - 02 L834788 SG1-2 8 FT Collected date/time: 05/09/16 14:33 Volatile Organic Compounds (MS) by Method TO-15 CAS #Mol. Wt.RDL1 RDL2 Result Result Qualifier Dilution Batch Analyte ppbv ug/m3 ppbv ug/m3 1,1-Dichloroethene 75-35-4 96.90 0.200 0.793 ND ND 1 WG871908 1,2-Dichloroethane 107-06-2 99 0.200 0.810 ND ND 1 WG871908 cis-1,2-Dichloroethene 156-59-2 96.90 0.200 0.793 ND ND 1 WG871908 trans-1,2-Dichloroethene 156-60-5 96.90 0.200 0.793 ND ND 1 WG871908 Tetrachloroethylene 127-18-4 166 0.200 1.36 ND ND 1 WG871908 Trichloroethylene 79-01-6 131 0.200 1.07 ND ND 1 WG871908 Vinyl chloride 75-01-4 62.50 0.200 0.511 0.895 2.29 1 WG871908 (S) 1,4-Bromofluorobenzene 460-00-4 175 60.0-140 94.2 WG871908 1 Cp 2Tc 3Ss 4Cn 5Sr 6Qc 7Gl 8Al 9Sc ACCOUNT:PROJECT:SDG:DATE/TIME:PAGE: S&ME Inc. - Raleigh NC 4302-16-017 L834788 05/13/16 14:59 6 of 14 ACCOUNT:PROJECT:SDG:DATE/TIME:PAGE: S&ME Inc. - Raleigh NC 4302-16-017 L834788 05/13/16 17:51 6 of 14 ONE LAB. NATIONWIDE.SAMPLE RESULTS - 04 L834788 SG1-4 8 FT Collected date/time: 05/09/16 14:05 Volatile Organic Compounds (MS) by Method TO-15 CAS #Mol. Wt.RDL1 RDL2 Result Result Qualifier Dilution Batch Analyte ppbv ug/m3 ppbv ug/m3 1,1-Dichloroethene 75-35-4 96.90 0.200 0.793 ND ND 1 WG871908 1,2-Dichloroethane 107-06-2 99 0.200 0.810 ND ND 1 WG871908 cis-1,2-Dichloroethene 156-59-2 96.90 0.200 0.793 ND ND 1 WG871908 trans-1,2-Dichloroethene 156-60-5 96.90 0.200 0.793 ND ND 1 WG871908 Tetrachloroethylene 127-18-4 166 0.200 1.36 ND ND 1 WG871908 Trichloroethylene 79-01-6 131 0.200 1.07 ND ND 1 WG871908 Vinyl chloride 75-01-4 62.50 0.200 0.511 ND ND 1 WG871908 (S) 1,4-Bromofluorobenzene 460-00-4 175 60.0-140 96.0 WG871908 1 Cp 2Tc 3Ss 4Cn 5Sr 6Qc 7Gl 8Al 9Sc ACCOUNT:PROJECT:SDG:DATE/TIME:PAGE: S&ME Inc. - Raleigh NC 4302-16-017 L834788 05/13/16 14:59 7 of 14 ACCOUNT:PROJECT:SDG:DATE/TIME:PAGE: S&ME Inc. - Raleigh NC 4302-16-017 L834788 05/13/16 17:51 7 of 14 ONE LAB. NATIONWIDE.SAMPLE RESULTS - 06 L834788 DUPLICATE 8 FT Collected date/time: 05/09/16 00:00 Volatile Organic Compounds (MS) by Method TO-15 CAS #Mol. Wt.RDL1 RDL2 Result Result Qualifier Dilution Batch Analyte ppbv ug/m3 ppbv ug/m3 1,1-Dichloroethene 75-35-4 96.90 0.200 0.793 ND ND 1 WG871915 1,2-Dichloroethane 107-06-2 99 0.200 0.810 ND ND 1 WG871915 cis-1,2-Dichloroethene 156-59-2 96.90 0.200 0.793 ND ND 1 WG871915 trans-1,2-Dichloroethene 156-60-5 96.90 0.200 0.793 ND ND 1 WG871915 Tetrachloroethylene 127-18-4 166 0.200 1.36 2.77 18.8 1 WG871915 Trichloroethylene 79-01-6 131 0.200 1.07 ND ND 1 WG871915 Vinyl chloride 75-01-4 62.50 0.200 0.511 ND ND 1 WG871915 (S) 1,4-Bromofluorobenzene 460-00-4 175 60.0-140 103 WG871915 1 Cp 2Tc 3Ss 4Cn 5Sr 6Qc 7Gl 8Al 9Sc ACCOUNT:PROJECT:SDG:DATE/TIME:PAGE: S&ME Inc. - Raleigh NC 4302-16-017 L834788 05/13/16 14:59 8 of 14 ACCOUNT:PROJECT:SDG:DATE/TIME:PAGE: S&ME Inc. - Raleigh NC 4302-16-017 L834788 05/13/16 17:51 8 of 14 ONE LAB. NATIONWIDE.QUALITY CONTROL SUMMARYWG871908 Volatile Organic Compounds (MS) by Method TO-15 L834788-01,02,04 Method Blank (MB) (MB) R3136561-3 05/12/16 10:44 MB Result MB Qualifier MB MDL MB RDL Analyte ppbv ppbv ppbv 1,2-Dichloroethane U 0.0616 0.200 1,1-Dichloroethene U 0.0490 0.200 cis-1,2-Dichloroethene U 0.0389 0.200 trans-1,2-Dichloroethene U 0.0464 0.200 Tetrachloroethylene U 0.0497 0.200 Trichloroethylene U 0.0545 0.200 Vinyl chloride U 0.0457 0.200 (S) 1,4-Bromofluorobenzene 94.5 60.0-140 Laboratory Control Sample (LCS) • Laboratory Control Sample Duplicate (LCSD) (LCS) R3136561-1 05/12/16 09:17 • (LCSD) R3136561-2 05/12/16 10:00 Spike Amount LCS Result LCSD Result LCS Rec.LCSD Rec.Rec. Limits LCS Qualifier LCSD Qualifier RPD RPD Limits Analyte ppbv ppbv ppbv %%%%% Vinyl chloride 3.75 3.72 3.77 99.2 100 70.0-130 1.31 25 1,1-Dichloroethene 3.75 3.58 3.70 95.5 98.5 70.0-130 3.15 25 trans-1,2-Dichloroethene 3.75 3.79 3.85 101 103 70.0-130 1.41 25 cis-1,2-Dichloroethene 3.75 3.81 3.87 102 103 70.0-130 1.54 25 1,2-Dichloroethane 3.75 3.57 3.67 95.1 97.9 70.0-130 2.86 25 Trichloroethylene 3.75 4.04 4.09 108 109 70.0-130 1.26 25 Tetrachloroethylene 3.75 4.28 4.35 114 116 70.0-130 1.58 25 (S) 1,4-Bromofluorobenzene 94.7 95.3 60.0-140 1 Cp 2Tc 3Ss 4Cn 5Sr 6Qc 7Gl 8Al 9Sc ACCOUNT:PROJECT:SDG:DATE/TIME:PAGE: S&ME Inc. - Raleigh NC 4302-16-017 L834788 05/13/16 14:59 9 of 14 ACCOUNT:PROJECT:SDG:DATE/TIME:PAGE: S&ME Inc. - Raleigh NC 4302-16-017 L834788 05/13/16 17:51 9 of 14 ONE LAB. NATIONWIDE.QUALITY CONTROL SUMMARYWG871915 Volatile Organic Compounds (MS) by Method TO-15 L834788-06 Method Blank (MB) (MB) R3136132-3 05/12/16 09:37 MB Result MB Qualifier MB MDL MB RDL Analyte ppbv ppbv ppbv 1,2-Dichloroethane U 0.0616 0.200 1,1-Dichloroethene U 0.0490 0.200 cis-1,2-Dichloroethene U 0.0389 0.200 trans-1,2-Dichloroethene U 0.0464 0.200 Tetrachloroethylene U 0.0497 0.200 Trichloroethylene U 0.0545 0.200 Vinyl chloride U 0.0457 0.200 (S) 1,4-Bromofluorobenzene 94.3 60.0-140 Laboratory Control Sample (LCS) • Laboratory Control Sample Duplicate (LCSD) (LCS) R3136132-1 05/12/16 08:18 • (LCSD) R3136132-2 05/12/16 08:56 Spike Amount LCS Result LCSD Result LCS Rec.LCSD Rec.Rec. Limits LCS Qualifier LCSD Qualifier RPD RPD Limits Analyte ppbv ppbv ppbv %%%%% Vinyl chloride 3.75 3.55 3.61 94.7 96.2 70.0-130 1.58 25 1,1-Dichloroethene 3.75 3.08 3.22 82.1 85.9 70.0-130 4.59 25 trans-1,2-Dichloroethene 3.75 3.07 3.21 81.7 85.6 70.0-130 4.62 25 cis-1,2-Dichloroethene 3.75 4.28 4.27 114 114 70.0-130 0.0200 25 1,2-Dichloroethane 3.75 4.16 4.09 111 109 70.0-130 1.72 25 Trichloroethylene 3.75 4.21 4.19 112 112 70.0-130 0.370 25 Tetrachloroethylene 3.75 4.20 4.21 112 112 70.0-130 0.120 25 (S) 1,4-Bromofluorobenzene 98.0 98.1 60.0-140 1 Cp 2Tc 3Ss 4Cn 5Sr 6Qc 7Gl 8Al 9Sc ACCOUNT:PROJECT:SDG:DATE/TIME:PAGE: S&ME Inc. - Raleigh NC 4302-16-017 L834788 05/13/16 14:59 10 of 14 ACCOUNT:PROJECT:SDG:DATE/TIME:PAGE: S&ME Inc. - Raleigh NC 4302-16-017 L834788 05/13/16 17:51 10 of 14 ONE LAB. NATIONWIDE.GLOSSARY OF TERMS Abbreviations and Definitions SDG Sample Delivery Group. MDL Method Detection Limit. RDL Reported Detection Limit. ND,U Not detected at the Reporting Limit (or MDL where applicable). RPD Relative Percent Difference. (dry)Results are reported based on the dry weight of the sample. [this will only be present on a dry report basis for soils]. Original Sample The non-spiked sample in the prep batch used to determine the Relative Percent Difference (RPD) from a quality control sample. The Original Sample may not be included within the reported SDG. (S)Surrogate (Surrogate Standard) - Analytes added to every blank, sample, Laboratory Control Sample/Duplicate and Matrix Spike/Duplicate; used to evaluate analytical efficiency by measuring recovery. Surrogates are not expected to be detected in all environmental media. Rec.Recovery. SDL Sample Detection Limit. MQL Method Quantitation Limit. Unadj. MQL Unadjusted Method Quantitation Limit. Qualifier Description The remainder of this page intentionally left blank, there are no qualifiers applied to this SDG. 1 Cp 2Tc 3Ss 4Cn 5Sr 6Qc 7Gl 8Al 9Sc ACCOUNT:PROJECT:SDG:DATE/TIME:PAGE: S&ME Inc. - Raleigh NC 4302-16-017 L834788 05/13/16 14:59 11 of 14 ACCOUNT:PROJECT:SDG:DATE/TIME:PAGE: S&ME Inc. - Raleigh NC 4302-16-017 L834788 05/13/16 17:51 11 of 14 ONE LAB. NATIONWIDE.ACCREDITATIONS & LOCATIONS 1 Cp 2Tc 3Ss 4Cn 5Sr 6Qc 7Gl 8Al 9Sc ACCOUNT:PROJECT:SDG:DATE/TIME:PAGE: S&ME Inc. - Raleigh NC 4302-16-017 L834788 05/13/16 14:59 12 of 14 Our Locations Alabama 40660 Alaska UST-080 Arizona AZ0612 Arkansas 88-0469 California 01157CA Colorado TN00003 Conneticut PH-0197 Florida E87487 Georgia NELAP Georgia 1 923 Idaho TN00003 Illinois 200008 Indiana C-TN-01 Iowa 364 Kansas E-10277 Kentucky 1 90010 Kentucky 2 16 Louisiana AI30792 Maine TN0002 Maryland 324 Massachusetts M-TN003 Michigan 9958 Minnesota 047-999-395 Mississippi TN00003 Missouri 340 Montana CERT0086 Nebraska NE-OS-15-05 Nevada TN-03-2002-34 New Hampshire 2975 New Jersey–NELAP TN002 New Mexico TN00003 New York 11742 North Carolina Env375 North Carolina 1 DW21704 North Carolina 2 41 North Dakota R-140 Ohio–VAP CL0069 Oklahoma 9915 Oregon TN200002 Pennsylvania 68-02979 Rhode Island 221 South Carolina 84004 South Dakota n/a Tennessee 1 4 2006 Texas T 104704245-07-TX Texas 5 LAB0152 Utah 6157585858 Vermont VT2006 Virginia 109 Washington C1915 West Virginia 233 Wisconsin 9980939910 Wyoming A2LA A2LA – ISO 17025 1461.01 Canada 1461.01 EPA–Crypto TN00003 AIHA 100789 DOD 1461.01 USDA S-67674 State Accreditations Third Party & Federal Accreditations ESC Lab Sciences is the only environmental laboratory accredited/certified to support your work nationwide from one location. 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ACCOUNT:PROJECT:SDG:DATE/TIME:PAGE: S&ME Inc. - Raleigh NC 4302-16-017 L834788 05/13/16 17:51 12 of 14 REFERENCE 10 REFERENCE 11 Output generated 05AUG2022:17:28:27 Resident Air Inputs 1 Variable Resident Air Default Value Site-Specific Value AFgw (Attenuation Factor Groundwater) unitless 0.001 0.001 AFss (Attenuation Factor Sub-Slab) unitless 0.03 0.03 EDres (exposure duration) years 26 26 ED0-2 (mutagenic exposure duration first phase) years 2 2 ED2-6 (mutagenic exposure duration second phase) years 4 4 ED6-16 (mutagenic exposure duration third phase) years 10 10 ED16-26 (mutagenic exposure duration fourth phase) years 10 10 EFres (exposure frequency) days/year 350 350 EF0-2 (mutagenic exposure frequency first phase) days/year 350 350 EF2-6 (mutagenic exposure frequency second phase) days/year 350 350 EF6-16 (mutagenic exposure frequency third phase) days/year 350 350 EF16-26 (mutagenic exposure frequency fourth phase) days/year 350 350 ETres (exposure time) hours/day 24 24 ET0-2 (mutagenic exposure time first phase) hours/day 24 24 ET2-6 (mutagenic exposure time second phase) hours/day 24 24 ET6-16 (mutagenic exposure time third phase) hours/day 24 24 ET16-26 (mutagenic exposure time fourth phase) hours/day 24 24 THQ (target hazard quotient) unitless 0.1 0.1 LT (lifetime) years 70 70 TR (target risk) unitless 1.0E-06 1.0E-06 Output generated 05AUG2022:17:28:27 Resident Vapor Intrusion Screening Levels (VISL)2 Key: I = IRIS; P = PPRTV; O = OPP; A = ATSDR; C = Cal EPA; X = PPRTV Screening Level; H = HEAST; D = DWSHA; W = TEF applied; E = RPF applied; U = user provided; G = see RSL User's Guide Section 5; CA = cancer; NC = noncancer. Chemical CAS Number Does the chemical meet the definition for volatility? (HLC>1E-5 or VP>1) Does the chemical have inhalation toxicity data? (IUR and/or RfC) Is Chemical Sufficiently Volatile and Toxic to Pose Inhalation Risk Via Vapor Intrusion from Soil Source? (Cvp > Ci,a,Target?) Is Chemical Sufficiently Volatile and Toxic to Pose Inhalation Risk Via Vapor Intrusion from Groundwater Source? (Chc > Ci,a,Target?) Target Indoor Air Concentration (TCR=1E-06 or THQ=0.1) MIN(Cia,c,Cia,nc) (µg/m3) Toxicity Basis Target Sub-Slab and Near-source Soil Gas Concentration (TCR=1E-06 or THQ=0.1) Csg,Target (µg/m3) Target Groundwater Concentration (TCR=1E-06 or THQ=0.1) Cgw,Target (µg/L) Benzene 71-43-2 Yes Yes Yes Yes 3.60E-01 CA 1.20E+01 1.59E+00 Chloroform 67-66-3 Yes Yes Yes Yes 1.22E-01 CA 4.07E+00 8.14E-01 Dichloroethane, 1,1-75-34-3 Yes Yes Yes Yes 1.75E+00 CA 5.85E+01 7.64E+00 Dichloroethane, 1,2-107-06-2 Yes Yes Yes Yes 1.08E-01 CA 3.60E+00 2.24E+00 Dichloroethylene, 1,1-75-35-4 Yes Yes Yes Yes 2.09E+01 NC 6.95E+02 1.95E+01 Dichloroethylene, cis-1,2-156-59-2 Yes No No Inhal. Tox. Info No Inhal. Tox. Info --- Dichloroethylene, trans-1,2-156-60-5 Yes Yes Yes Yes 4.17E+00 NC 1.39E+02 1.09E+01 Tetrachloroethylene 127-18-4 Yes Yes Yes Yes 4.17E+00 NC 1.39E+02 5.76E+00 Toluene 108-88-3 Yes Yes Yes Yes 5.21E+02 NC 1.74E+04 1.92E+03 Trichloroethane, 1,1,1-71-55-6 Yes Yes Yes Yes 5.21E+02 NC 1.74E+04 7.42E+02 Trichloroethane, 1,1,2-79-00-5 Yes Yes Yes Yes 2.09E-02 NC 6.95E-01 6.19E-01 Trichloroethylene 79-01-6 Yes Yes Yes Yes 2.09E-01 NC 6.95E+00 5.18E-01 Vinyl Chloride 75-01-4 Yes Yes Yes Yes 1.68E-01 CA 5.59E+00 1.47E-01 Output generated 05AUG2022:17:28:27 Resident Vapor Intrusion Screening Levels (VISL)3 Key: I = IRIS; P = PPRTV; O = OPP; A = ATSDR; C = Cal EPA; X = PPRTV Screening Level; H = HEAST; D = DWSHA; W = TEF applied; E = RPF applied; U = user provided; G = see RSL User's Guide Section 5; CA = cancer; NC = noncancer. Is Target Groundwater Concentration < MCL? (Cgw < MCL?) Pure Phase Vapor Concentration Cvp\ (25 ℃)\ (µg/m3) Maximum Groundwater Vapor Concentration Chc\ (µg/m3) Temperature for Maximum Groundwater Vapor Concentration (℃) Lower Explosive Limit LEL (% by volume) LEL Ref IUR (ug/m3)-1 IUR Ref RfC (mg/m 3) RfC Ref Mutagenic Indicator Carcinogenic VISL TCR=1E-06 Cia,c(µg/m3) Noncarcinogenic VISL THQ=0.1 Cia,nc(µg/m3) Yes (5)3.98E+08 4.06E+08 25 1.20 U 7.80E-06 U 3.00E-02 U No 3.60E-01 3.13E+00 Yes (80)1.26E+09 1.19E+09 25 -2.30E-05 U 9.77E-02 U No 1.22E-01 1.02E+01 --1.21E+09 1.16E+09 25 5.40 U 1.60E-06 U -No 1.75E+00 - Yes (5)4.20E+08 4.15E+08 25 6.20 U 2.60E-05 U 7.00E-03 U No 1.08E-01 7.30E-01 No (7)3.13E+09 2.58E+09 25 6.50 U -2.00E-01 U No -2.09E+01 1.04E+09 1.07E+09 25 3.00 U --No -- Yes (100)1.73E+09 1.73E+09 25 6.00 U -4.00E-02 U No -4.17E+00 No (5)1.65E+08 1.49E+08 25 -2.60E-07 U 4.00E-02 U No 1.08E+01 4.17E+00 No (1000)1.41E+08 1.43E+08 25 1.10 U -5.00E+00 U No -5.21E+02 No (200)8.90E+08 9.07E+08 25 8.00 U -5.00E+00 U No -5.21E+02 Yes (5)1.65E+08 1.55E+08 25 6.00 U 1.60E-05 U 2.00E-04 U No 1.75E-01 2.09E-02 Yes (5)4.88E+08 5.15E+08 25 8.00 U 4.10E-06 U 2.00E-03 U Mut 4.78E-01 2.09E-01 Yes (2)1.00E+10 1.00E+10 25 3.60 U 4.40E-06 U 8.00E-02 U Mut 1.68E-01 8.34E+00 Output generated 05AUG2022:17:28:27 Chemical Properties 4 Chemical CAS Number Does the chemical meet the definition for volatility? (HLC>1E-5 or VP>1) Does the chemical have inhalation toxicity data? (IUR and/or RfC)MW MW Ref Vapor Pressure VP (mm Hg) VP Ref S (mg/L) S Ref MCL (ug/L) Benzene 71-43-2 Yes Yes 78.12 U 9.48E+01 U 1.79E+03 U 5 Chloroform 67-66-3 Yes Yes 119.38 U 1.97E+02 U 7.95E+03 U 80 Dichloroethane, 1,1-75-34-3 Yes Yes 98.96 U 2.27E+02 U 5.04E+03 U - Dichloroethane, 1,2-107-06-2 Yes Yes 98.96 U 7.89E+01 U 8.60E+03 U 5 Dichloroethylene, 1,1-75-35-4 Yes Yes 96.94 U 6.00E+02 U 2.42E+03 U 7 Dichloroethylene, cis-1,2-156-59-2 Yes No 96.94 U 2.00E+02 U 6.41E+03 U 70 Dichloroethylene, trans-1,2-156-60-5 Yes Yes 96.94 U 3.31E+02 U 4.52E+03 U 100 Tetrachloroethylene 127-18-4 Yes Yes 165.83 U 1.85E+01 U 2.06E+02 U 5 Toluene 108-88-3 Yes Yes 92.14 U 2.84E+01 U 5.26E+02 U 1000 Trichloroethane, 1,1,1-71-55-6 Yes Yes 133.41 U 1.24E+02 U 1.29E+03 U 200 Trichloroethane, 1,1,2-79-00-5 Yes Yes 133.41 U 2.30E+01 U 4.59E+03 U 5 Trichloroethylene 79-01-6 Yes Yes 131.39 U 6.90E+01 U 1.28E+03 U 5 Vinyl Chloride 75-01-4 Yes Yes 62.50 U 2.98E+03 U 8.80E+03 U 2 Output generated 05AUG2022:17:28:27 Chemical Properties 5 HLC (atm-m 3/mole) Henry's Law Constant (unitless) H` and HLC Ref Henry's Law Constant Used in Calcs (unitless) Normal Boiling Point BP (K) BP Ref Critical Temperature TC\ (K) TC\ Ref Enthalpy of vaporization at the normal boiling point ΔHv,b\ (cal/mol) ΔHv,b\ Ref Lower Explosive Limit LEL (% by volume) LEL Ref 5.55E-03 2.27E-01 U 2.27E-01 353.15 U 5.62E+02 U 7340.00 U 1.20 U 3.67E-03 1.50E-01 U 1.50E-01 334.25 U 5.36E+02 U 6990.00 U - 5.62E-03 2.30E-01 U 2.30E-01 330.55 U 5.23E+02 U 6900.00 U 5.40 U 1.18E-03 4.82E-02 U 4.82E-02 356.65 U 5.62E+02 U 7640.00 U 6.20 U 2.61E-02 1.07E+00 U 1.07E+00 304.85 U 4.82E+02 U 6250.00 U 6.50 U 4.08E-03 1.67E-01 U 1.67E-01 333.25 U 5.36E+02 U 7220.00 U 3.00 U 9.38E-03 3.83E-01 U 3.83E-01 321.85 U 5.16E+02 U 6910.00 U 6.00 U 1.77E-02 7.24E-01 U 7.24E-01 394.15 U 6.20E+02 U 8290.00 U - 6.64E-03 2.71E-01 U 2.71E-01 384.15 U 5.92E+02 U 7930.00 U 1.10 U 1.72E-02 7.03E-01 U 7.03E-01 347.15 U 5.45E+02 U 7140.00 U 8.00 U 8.24E-04 3.37E-02 U 3.37E-02 387.15 U 6.02E+02 U 8320.00 U 6.00 U 9.85E-03 4.03E-01 U 4.03E-01 360.35 U 5.71E+02 U 7500.00 U 8.00 U 2.78E-02 1.14E+00 U 1.14E+00 259.85 U 4.25E+02 U 4970.00 U 3.60 U Output generated 05AUG2022:17:43:01 Default VISL Results 1 Variable Value Exposure Scenario Commercial Temperature for Groundwater Vapor Concentration C 25 THQ (target hazard quotient) unitless 0.1 TR (target risk) unitless 0.0001 ATw (averaging time - composite worker)365 EFw (exposure frequency - composite worker) day/yr 250 EDw (exposure duration - composite worker) yr 25 ETw (exposure time - composite worker) hr 8 LT (lifetime) yr 70 AFgw (Attenuation Factor Groundwater) unitless 0.001 AFss (Attenuation Factor Sub-Slab) unitless 0.03 Output generated 05AUG2022:17:43:01 Commercial Vapor Intrusion Screening Levels (VISL)2 Key: I = IRIS; P = PPRTV; O = OPP; A = ATSDR; C = Cal EPA; X = PPRTV Screening Level; H = HEAST; D = DWSHA; W = TEF applied; E = RPF applied; U = user provided; G = see RSL User's Guide Section 5; CA = cancer; NC = noncancer. Chemical CAS Number Does the chemical meet the definition for volatility? (HLC>1E-5 or VP>1) Does the chemical have inhalation toxicity data? (IUR and/or RfC) Is Chemical Sufficiently Volatile and Toxic to Pose Inhalation Risk Via Vapor Intrusion from Soil Source? (Cvp > Ci,a,Target?) Is Chemical Sufficiently Volatile and Toxic to Pose Inhalation Risk Via Vapor Intrusion from Groundwater Source? (Chc > Ci,a,Target?) Target Indoor Air Concentration (TCR=0.0001 or THQ=0.1) MIN(Cia,c,Cia,nc) (µg/m3) Toxicity Basis Target Sub-Slab and Near-source Soil Gas Concentration (TCR=0.0001 or THQ=0.1) Csg,Target (µg/m3) Target Groundwater Concentration (TCR=0.0001 or THQ=0.1) Cgw,Target (µg/L) Benzene 71-43-2 Yes Yes Yes Yes 1.31E+01 NC 4.38E+02 5.79E+01 Chloroform 67-66-3 Yes Yes Yes Yes 4.28E+01 NC 1.43E+03 2.85E+02 Dichloroethane, 1,1-75-34-3 Yes Yes Yes Yes 7.67E+02 CA 2.56E+04 3.34E+03 Dichloroethane, 1,2-107-06-2 Yes Yes Yes Yes 3.07E+00 NC 1.02E+02 6.36E+01 Dichloroethylene, 1,1-75-35-4 Yes Yes Yes Yes 8.76E+01 NC 2.92E+03 8.21E+01 Dichloroethylene, cis-1,2-156-59-2 Yes No No Inhal. Tox. Info No Inhal. Tox. Info --- Dichloroethylene, trans-1,2-156-60-5 Yes Yes Yes Yes 1.75E+01 NC 5.84E+02 4.57E+01 Tetrachloroethylene 127-18-4 Yes Yes Yes Yes 1.75E+01 NC 5.84E+02 2.42E+01 Toluene 108-88-3 Yes Yes Yes Yes 2.19E+03 NC 7.30E+04 8.07E+03 Trichloroethane, 1,1,1-71-55-6 Yes Yes Yes Yes 2.19E+03 NC 7.30E+04 3.11E+03 Trichloroethane, 1,1,2-79-00-5 Yes Yes Yes Yes 8.76E-02 NC 2.92E+00 2.60E+00 Trichloroethylene 79-01-6 Yes Yes Yes Yes 8.76E-01 NC 2.92E+01 2.18E+00 Vinyl Chloride 75-01-4 Yes Yes Yes Yes 3.50E+01 NC 1.17E+03 3.08E+01 Output generated 05AUG2022:17:43:01 Commercial Vapor Intrusion Screening Levels (VISL)3 Key: I = IRIS; P = PPRTV; O = OPP; A = ATSDR; C = Cal EPA; X = PPRTV Screening Level; H = HEAST; D = DWSHA; W = TEF applied; E = RPF applied; U = user provided; G = see RSL User's Guide Section 5; CA = cancer; NC = noncancer. Is Target Groundwater Concentration < MCL? (Cgw < MCL?) Pure Phase Vapor Concentration Cvp\ (25 ℃)\ (µg/m3) Maximum Groundwater Vapor Concentration Chc\ (µg/m3) Temperature for Maximum Groundwater Vapor Concentration (℃) Lower Explosive Limit LEL (% by volume) LEL Ref IUR (ug/m 3)-1 IUR Ref RfC (mg/m3) RfC Ref Mutagenic Indicator Carcinogenic VISL TCR=0.0001 Cia,c(µg/m3) Noncarcinogenic VISL THQ=0.1 Cia,nc(µg/m3) No (5)3.98E+08 4.06E+08 25 1.20 CRC 7.80E-06 I 3.00E-02 I No 1.57E+02 1.31E+01 No (80)1.26E+09 1.19E+09 25 -2.30E-05 I 9.77E-02 A No 5.33E+01 4.28E+01 --1.21E+09 1.16E+09 25 5.40 CRC 1.60E-06 C -No 7.67E+02 - No (5)4.20E+08 4.15E+08 25 6.20 CRC 2.60E-05 I 7.00E-03 P No 4.72E+01 3.07E+00 No (7)3.13E+09 2.58E+09 25 6.50 CRC -2.00E-01 I No -8.76E+01 1.04E+09 1.07E+09 25 3.00 CRC --No -- Yes (100)1.73E+09 1.73E+09 25 6.00 CRC -4.00E-02 X No -1.75E+01 No (5)1.65E+08 1.49E+08 25 -2.60E-07 I 4.00E-02 I No 4.72E+03 1.75E+01 No (1000)1.41E+08 1.43E+08 25 1.10 CRC -5.00E+00 I No -2.19E+03 No (200)8.90E+08 9.07E+08 25 8.00 CRC -5.00E+00 I No -2.19E+03 Yes (5)1.65E+08 1.55E+08 25 6.00 CRC 1.60E-05 I 2.00E-04 X No 7.67E+01 8.76E-02 Yes (5)4.88E+08 5.15E+08 25 8.00 CRC 4.10E-06 I 2.00E-03 I Mut 2.99E+02 8.76E-01 No (2)1.00E+10 1.00E+10 25 3.60 CRC 4.40E-06 I 8.00E-02 A Mut 2.79E+02 3.50E+01 Output generated 05AUG2022:17:43:01 Chemical Properties 4 Output generated 05AUG2022:17:43:01 Chemical CAS Number Does the chemical meet the definition for volatility? (HLC>1E-5 or VP>1) Does the chemical have inhalation toxicity data? (IUR and/or RfC)MW MW Ref Vapor Pressure VP (mm Hg) VP Ref S (mg/L) S Ref MCL (ug/L) Benzene 71-43-2 Yes Yes 78.115 PHYSPROP 9.48E+01 PHYSPROP 1.79E+03 PHYSPROP 5 Chloroform 67-66-3 Yes Yes 119.38 PHYSPROP 1.97E+02 PHYSPROP 7.95E+03 PHYSPROP 80 Dichloroethane, 1,1-75-34-3 Yes Yes 98.96 PHYSPROP 2.27E+02 PHYSPROP 5.04E+03 PHYSPROP - Dichloroethane, 1,2-107-06-2 Yes Yes 98.96 PHYSPROP 7.89E+01 PHYSPROP 8.60E+03 PHYSPROP 5 Dichloroethylene, 1,1-75-35-4 Yes Yes 96.944 PHYSPROP 6.00E+02 PHYSPROP 2.42E+03 PHYSPROP 7 Dichloroethylene, cis-1,2-156-59-2 Yes No 96.944 PHYSPROP 2.00E+02 PHYSPROP 6.41E+03 PHYSPROP 70 Dichloroethylene, trans-1,2-156-60-5 Yes Yes 96.944 PHYSPROP 3.31E+02 EPI 4.52E+03 PHYSPROP 100 Tetrachloroethylene 127-18-4 Yes Yes 165.83 PHYSPROP 1.85E+01 PHYSPROP 2.06E+02 PHYSPROP 5 Toluene 108-88-3 Yes Yes 92.142 PHYSPROP 2.84E+01 PHYSPROP 5.26E+02 PHYSPROP 1000 Trichloroethane, 1,1,1-71-55-6 Yes Yes 133.41 PHYSPROP 1.24E+02 PHYSPROP 1.29E+03 PHYSPROP 200 Trichloroethane, 1,1,2-79-00-5 Yes Yes 133.41 PHYSPROP 2.30E+01 PHYSPROP 4.59E+03 PHYSPROP 5 Trichloroethylene 79-01-6 Yes Yes 131.39 PHYSPROP 6.90E+01 PHYSPROP 1.28E+03 PHYSPROP 5 Vinyl Chloride 75-01-4 Yes Yes 62.499 PHYSPROP 2.98E+03 EPI 8.80E+03 PHYSPROP 2 Output generated 05AUG2022:17:43:01 Chemical Properties 5 Output generated 05AUG2022:17:43:01 HLC (atm-m 3/mole) Henry's Law Constant (unitless) H` and HLC Ref Henry's Law Constant Used in Calcs (unitless) Normal Boiling Point BP (K) BP Ref Critical Temperature TC\ (K) TC\ Ref Enthalpy of vaporization at the normal boiling point ΔHv,b\ (cal/mol) ΔHv,b\ Ref Lower Explosive Limit LEL (% by volume) LEL Ref 5.55E-03 2.27E-01 PHYSPROP 2.27E-01 353.15 PHYSPROP 5.62E+02 CRC 7.34E+03 CRC 1.2 CRC 3.67E-03 1.50E-01 PHYSPROP 1.50E-01 334.25 PHYSPROP 5.36E+02 CRC 6.99E+03 CRC - 5.62E-03 2.30E-01 PHYSPROP 2.30E-01 330.55 PHYSPROP 5.23E+02 CRC 6.90E+03 CRC 5.4 CRC 1.18E-03 4.82E-02 PHYSPROP 4.82E-02 356.65 PHYSPROP 5.62E+02 CRC 7.64E+03 CRC 6.2 CRC 2.61E-02 1.07E+00 PHYSPROP 1.07E+00 304.85 PHYSPROP 4.82E+02 YAWS 6.25E+03 CRC 6.5 CRC 4.08E-03 1.67E-01 PHYSPROP 1.67E-01 333.25 PHYSPROP 5.36E+02 CRC 7.22E+03 CRC 3 CRC 9.38E-03 3.83E-01 PHYSPROP 3.83E-01 321.85 PHYSPROP 5.16E+02 CRC 6.91E+03 CRC 6 CRC 1.77E-02 7.24E-01 PHYSPROP 7.24E-01 394.45 PHYSPROP 6.20E+02 YAWS 8.29E+03 CRC - 6.64E-03 2.71E-01 PHYSPROP 2.71E-01 383.75 PHYSPROP 5.92E+02 CRC 7.93E+03 CRC 1.1 CRC 1.72E-02 7.03E-01 PHYSPROP 7.03E-01 347.15 PHYSPROP 5.45E+02 YAWS 7.14E+03 CRC 8 CRC 8.24E-04 3.37E-02 PHYSPROP 3.37E-02 386.95 PHYSPROP 6.02E+02 YAWS 8.32E+03 CRC 6 CRC 9.85E-03 4.03E-01 PHYSPROP 4.03E-01 360.35 PHYSPROP 5.71E+02 YAWS 7.50E+03 CRC 8 CRC 2.78E-02 1.14E+00 PHYSPROP 1.14E+00 259.85 PHYSPROP 4.25E+02 CRC 4.97E+03 CRC 3.6 CRC REFERENCE 12