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HomeMy WebLinkAbout26090_Smokey Mtn Petroleum_BRSAssessmentWorkplanRevision2_20230929ECF.4eq ECS SOUTHEAST, LLP "Setting the Standard for Service" Geotechnical • Consiruc ion Materials • Environmental • Facilities NC: Registered Engineering Firm F-1078 NC Registered Geologists Firm C-553 SC Registered Engineering Firm 3239 TM BROWNFIELDS ENVIRONMENTAL ASSESSMENT WORK PLAN REVISION 1.0 SMOKEY MOUNTAIN PETROLEUM SITE 456-466 SWANNANOA RIVER ROAD ASHEVILLE, BUNCOMBE COUNTY, NORTH CAROLINA BROWNFIELDS PROJECT ID. 26090-22-011 ECS PROJECT NO. 49:13699-E3 PREPARED FOR BUCKEY COMMUNITY HOPE FOUNDATION SEPTEMBER 22, 2023 Work Plan Certification I, Don R. Marlor, P.G., a Licensed Geologist for ECS Southeast, LLP (North Carolina Licensed Geologist Firm C-553), do certify that the information contained herein is correct and accurate to the best of my knowledge. 11111111111111►1�,,, ,1` GE S'$-- z EA .00��FoLo��5�•''Q�s Don R. Marlor, I9.16,, R- M ,������Illllal NC License No. 2645 ECS Capitol Services, PLLC • ECS Florida, LLC • ECS Mid -Atlantic, LLC - ECS Midwest, LLC • ECS Southeast, LLP • ECS Southwest, LLP www.ecs[imited.com Eg ECS SOUTHEAST, LLP "Setting the Standard for Service" Geotechnical • Construction Materials • Environmental • Facilities IBC Registered Engineering Firm F-1078 NC Registered Geologists Firm C-553 SC Registered Engineering Firm 3239 Mr. Kris Riddle September 22, 2023 North Carolina Department of Environmental Quality Division of Waste Management Brownfields Redevelopment Section 2090 U.S. 70 Highway Swannanoa, North Carolina 28778-8211 Reference: Brownfields Environmental Assessment Work Plan — Revision 1.0 Smokey Mountain Petroleum 456-466 Swannanoa River Road (also listed as 21 and 99999 Governors View Road) Asheville, Buncombe County, North Carolina Brownfields Project No. 26090-22-011 ECS Project No. 49-13699-E3 Dear Mr. Riddle: ECS Southeast, LLP (ECS) has prepared this work plan on behalf of the Prospective Developer (Buckeye Community Hope Foundation) to collect soil, soil gas, groundwater, surface water, and sediment samples at the above referenced site. This plan has been developed at the request of the North Carolina Department of Environmental Quality (NCDEQ) Brownfields Redevelopment Section (BRS) in order to address data gaps as discussed during a kickoff meeting held on June 8, 2023, as well as subsequent discussions and correspondences. Also included with the submittal is a completed Minimum Requirements Checklist and Assessment Work Plan Approval Signature Page. ECS appreciates the opportunity to work with your Program. If you have any questions concerning this work plan or this project, please contact us. Sincerely, ECS SOUTHEAST, LLP ,5,r/ , /n� Don R. Marlor, P.G. Environmental Staff Project Manager 828-785-4183 dmarlor(o)-ecslimited.com Roger A. �mithP.G. Senior Principal Geologist 704-378-9015 rsmith3(a-ecslimited.com Enclosures: Brownfields Environmental Assessment Work Plan Assessment Work Plan Approval Signature Page ECS Capitol Services, PLLC • ECS Flodda, LLC • ECS Mid -Atlantic, LLC • ECS Midwest, LLC • ECS Southeast, LLP • ECS Southwest, LLP www.ecslimited.com ROY COOPER Governor ELIZABETH S. BISER Secretary MICHAEL SCOTT NORTH CAROUNA Director Environmental Quality ATTACHMENT 1 DEQ Brownfields Redevelopment Section Assessment Work Plan Approval Signature Page To be completed by Development Team and returned to DEQ Brownfields for review & signature. Brownfields Project Name: Smokey Mountain Petroleum Brownfields Project Number: 26090-22-011 Work Plan Title: Brownfields Environmental Assessment Work Plan Date: September 22, 2023 Revision Number: 1.0 Be advised that this approval from DEQ Brownfields does not waive any applicable requirement to obtain any necessary permits, licenses, or certifications for the above listed activities nor does it waive any requirement to comply with applicable law for such activities. Prospective Developer (PD): Buckeye Community Hope Foundation Contact Person: Mr. Steve Sceranka Phone Numbers: Office: 843-437-9530 Mobile: Chcl: or tap here to enter text. Email: sboone@buckeyehope.org Property Owner (if different from above): Swannanoa River Rd, LLC and Realty Company II, LLC Address: 21 Ridgefield Place, Asheville, NC Contact Person: Wes Morgan and C. W. Morgan Jr. Phone Numbers: Office: Clid, or tap here to enter teat. Mobile: Clicl: or tap here to enter lest. Email: Uld, or tap here to enter text. Environmental Consultant: ECS Southeast, LLP Contact Person: Don R. Marlor, P.G. Phone Numbers: Office: 828-785-4183 Email: dmarlor@ecslimited.com Signature: VE Consultant: ECS Southeast, LLP Printed Name/Title/Company: Don R. Marlor, P.G./Project Manager/ECS Southeast, LLP Brownfields Project Manager: Kris Riddle Phone Numbers: Office: Clid, or tap here to enter text Email: Clicl; or tap here to enter text. Signature: r al Mobile: 828-202-1008 ,nnn►,, 4 CA IN SEAL >� a Mobile: Chcl: or tap here to enter text. 9/29/2023 Brownfields Project Manager:Clicl: or tap here to enter text. Date Chcl: or tap to enter a date. DEQr--N� �North Carolina Department of Environmental Qua lily I Division of Waste Management 217 West Jones Street 1 1646 Mail Service Center I Raleigh. North Carolina 27699-1646 r 919.707.8200 Smokey Mountain Petroleum Site - Brownfields Environmental Assessment Work Plan Brownfields Project #26090-22-011 ECS Project No. 49-13699-E3 TABLE OF CONTENTS 1.0 INTRODUCTION.....................................................................................................................1 2.0 SCOPE OF WORK.................................................................................................................5 3.0 SAMPLING METHODOLOGY..............................................................................................7 4.0 LABORATORY ANALYSIS.................................................................................................11 5.0 QUALITY ASSURANCE/QUALITY CONTROL...............................................................12 6.0 INVESTIGATION DERIVED WASTE MANAGEMENT...................................................13 7.0 REPORTING.........................................................................................................................13 FIGURES Figure 1 Topographic Location Figure 2 Historic Sample Locations Figure 3 Proposed Soil, Groundwater, and Sediment/Surface Water Sample Locations Figure 4 Proposed Soil Gas Sample Locations TABLE Table 1 Proposed Sample Locations & Analyses APPENDIX Appendix A Historical Sample Location Figures and Laboratory Analytical Data Tables Smokey Mountain Petroleum Site - Brownfields Environmental Assessment Work Plan Brownfields Project #26090-22-011 ECS Project No. 49-13699-E3 1.0 INTRODUCTION The Smokey Mountain Petroleum site (the Subject Site) consists of two parcels totaling 2.73 acres (see Figures 1 and 2) and is located in a commercial and residential area of Asheville, south of Governors View Road and north of Swannanoa River Road. The Subject Site is currently vacant and overgrow with a remnant concrete slab and block wall of former site structure (located on the northeastern portion of the Subject Site), along with some former gravel drive/parking areas. The Subject Site is identified by the Buncombe County Online GIS Database with the following Parcel Identification Numbers (PINs) and street address: Street Addresses PINs Parcel Size (Acres) 21 Governors View 965-854-606- 0.91 Road 000000 99999 Governors View 965-853-892- 1.82 Road 200000 The prospective developer (PD), Buckeye Community Hope Foundation, submitted a Brownfields Property (BP) Application on December 28, 2022 and subsequent additional information submitted by ECS (reviewed January 30, 2023 and February 2, 2023). On May 8, 2023, a Letter of Eligibility (LOE) for the Subject Site was issued by the Brownfields Redevelopment Section (BRS) to the PD to pursue a brownfields agreement. The proposed redevelopment plan will include a structure consisting of multi -family residential affordable housing (to be known as Redwood Commons), associated surface parking/drive areas, with limited recreational and landscaping areas. The ground floor square footage (i.e., "footprint") of the proposed building is 17,800 square feet and includes a leasing office, maintenance room, laundry facilities, tenant storage areas, and one- and two -bedroom residential units. The exterior site amenities include a a gazebo, walking trails, seating areas and a community garden. ECS previously completed a Phase 1 Environmental Site Assessment (Phase 1 ESA), Limited Soil and Groundwater Assessment, Soil Gas Assessment, and one subsurface exploration and geotechnical evaluation. These reports include environmental information pertaining to the Subject Site, as well as soil, soil gas, and groundwater quality sampling and analyses. The scope and findings of the prior assessment work includes the following: The Phase / ESA conducted for the Subject Site was dated December 30, 2021 (ECS Project No. 13699-A). The findings within the Phase 1 ESA identified that Smoky Mountain Petroleum Company, Inc. operated as a petroleum fuel distribution facility at the subject property from at least 1970 until the early 2000s. The facility included six (6) vertical 20,000-gallon aboveground storage tanks (ASTs) with associated truck loading area, nine (9) horizontal 4,000-gallon ASTs, three (3) horizontal 1,000-gallon ASTs, one (1) horizontal 275-gallon heating oil AST, four (4) underground storage tanks (USTs) west of facility building, one (1) or two (2) USTs south of the facility building, and dispensers near the southwest corner of the facility building. The approximate location of these ASTs, USTs and former site buildings are indicated on Figure 2. The facility building, ASTs, USTs, and associated distribution systems have reportedly been removed by others, from the Subject Site. When the USTs were removed, contaminated soil was identified and removed. However, soil and groundwater restrictions were placed on the subject property due to remaining contaminated soil and identified groundwater contamination above Smokey Mountain Petroleum Site - Brownfields Environmental Assessment Work Plan Brownfields Project #26090-22-011 ECS Project No. 49-13699-E3 regulatory standards. Assessment following the removal of the ASTs was not conducted at the subject property. A review of regulatory documentation conducted as part of the Phase 1 ESA, identified the adjoining property to the east (currently an Aldi grocery store) was previously developed with D.O. Creasman Co., Inc. Based on available files, soil and groundwater sampling was previously performed by others in several locations on the property. Areas of concern on the property included former 1,000 and 4,000-gallon USTs, fuel dispensers, a waste oil AST, a fuel oil AST, a former 12,000-gallon UST, a hydraulic line leak, and debris piles. According to reports reviewed by ECS, one soil sample was collected and analyzed from each area of concern. Total petroleum hydrocarbon (TPH) diesel range organics (DRO) was detected at concentrations above the State action level in several soil samples. Groundwater samples were also collected in several locations on the property. TPH-DRO was detected in each of the groundwater samples collected at concentrations ranging from 150 micrograms per liter (tag/L) to 3,500 pg/L. A North Carolina 2L Groundwater Quality Standard (NC2LGWQS) does not exist for TPH in groundwater. A groundwater sample was collected near the western boundary (near the subject property) which identified that the groundwater was impacted. The Phase 1 ESA identified the following recognized environmental conditions (RECs): • ECS considered the historical use of the property as a petroleum fuel distribution facility, which potentially resulted in undocumented releases of petroleum products, a REC for the subject property. • Bulk fuel ASTs were located on the property for approximately 30 years. Documentation of sampling in the areas of the ASTs was not identified during the previous assessments. Based on the size of the ASTs and extended period of operations, there is a potential for spillage and overfilling of the tanks and delivery trucks. • Gasoline dispensers were located near the southwestern corner of the facility building in the vicinity of the USTs. Documentation indicating when the dispensers were removed or that samples were collected beneath the dispensers were not available for review. • Petroleum releases at the eastern adjoining former D.O. Creasman Co., Inc. facility (now an Aldi store) have occurred and have the potential to impact the subject property. Documentation regarding the resolution of this incident was not available for review. The open petroleum incident was considered to present a REC for the subject property. In addition, the following controlled recognized environmental condition (CREC) was identified by the Phase 1 ESA: • Based on the residual contamination remaining at the property following the UST closure and associated land use restrictions, ECS considered the releases and land use restrictions a CREC for the subject property. Future site use and development should be conducted in accordance with the deed recorded land use restrictions. Following completion of the Phase 1 ESA and in order to further assess the identified RECs, ECS conducted limited soil and groundwater sampling at the Subject Site. The activities and results were summarized in ECS' Report of Limited Soil and Groundwater Assessment dated April 12, 2022 (ECS Project No. 49:13699-D). The Limited Soil and Groundwater Assessment activities were conducted by ECS in March, 2022 and consisted of the collection of ten soil samples and six groundwater samples, for laboratory analysis. Based on the field observations and laboratory analytical results of the soil and groundwater samples collected during the assessment, ECS concluded the following: 2 Smokey Mountain Petroleum Site - Brownfields Environmental Assessment Work Plan Brownfields Project #26090-22-011 ECS Project No. 49-13699-E3 Ten (10) soil samples were submitted to a North Carolina Certified laboratory for analysis of Volatile Organic Compounds (VOCs) and Semi -Volatile Organic Compounds (SVOCs) using EPA Methods 8260 and 8270, respectively. One of these soil samples (SB-1) was collected in the vicinity of the former gasoline dispensers, with the results identifying naphthalene at a concentration above its Residential and Soil -to -Groundwater Maximum Soil Contaminant Concentration (MSCC) and multiple other targeted VOCs and SVOCs above their respective Soil -to -Groundwater MSCCs. The remaining soil samples collected in the footprint of the former 4,000-gallon ASTs (SB-2, SB-3, SB-4, and SB-5), former 20,000-gallon ASTs (SB-6, SB-7, and SB-10), and former loading area (SB-8 and SB-9) did not contain targeted VOCs or SVOCs above their respective Soil -to -Water, Residential, or Industrial Commercial MSCCs. Six (6) groundwater samples (TW-1 through TW-6) were submitted to a North Carolina certified laboratory for analysis of VOCs and SVOCs using EPA Methods 8260 and 8270, respectively. Groundwater sample TW-5, collected in the vicinity of the former 20,000- gallon ASTs, contained naphthalene, 1-methylnaphthalene, and 2-methylnaphthalene at concentrations above their respective NC2LGWQS. Additionally, concentrations of ethylbenzene and naphthalene detected in TW-5 exceed both the Residential and Non - Residential Groundwater Screening Levels (GWSL) for Vapor Intrusion (VI). Groundwater sample TW-6 collected in the vicinity of former gasoline dispensers detected benzene, naphthalene, 1-methyl naphthalene, and 2-methyl naphthalene at concentrations above their respective NC2LGWQS and concentrations of ethylbenzene, naphthalene, and toluene above their respective Residential and Non -Residential GWSLs for VI. Groundwater sample TW-4 collected in the vicinity of the former loading area detected 1- methyl naphthalene at a concentration above its respective NC2LGWQS. Groundwater samples TW-2 and TW-3 located along the eastern property did not contain targeted VOCs or SVOCs above their respective laboratory method detection limits or their respective NC2LGWQS. Additionally, TW-1 collected in the vicinity of the former 4,000-gallon ASTs did not contain targeted VOCs or SVOCs above their respective laboratory method detection limits or their respective NC2LGWQS. Due to the GWSL for VI exceedances, ECS input the groundwater data for samples TW- 5 and TW-6 into the NCDEQ Risk Calculator (January 2022 Version). Based on the results of the risk calculators, detected concentrations in groundwater samples TW-5 and TW-6 exceeded the risk threshold for Residential occupancy; however, the detected concentrations did not exceed Non -Residential occupancy. Based on detections of compounds identified in the groundwater samples and the absence of detections in soil sample SB-1, it appears soil and groundwater at the site have been impacted from the on -site RECs, as previously documented. The approximate locations of these samples are indicated on Figure 2. In order to further assess the Subject Site for potential vapor intrusion issues, ECS completed a Soil Gas Assessment Report for the Subject Site dated July 7, 2023 (ECS Project No. 49-13699- F). The activities conducted consisted of the collection of five soil gas samples from the Subject Site. Initially, ECS proposed the installation and sampling of eight (8) soil gas points (SG-1 through SG-8) within the proposed building footprint; however, due to encountering refusal (potential concrete, debris, etc.) below the ground surface in three of the locations, only five of the proposed locations were sampled (SG-1 through SG-3 and SG-7 and SG-8). Based on the field observations and laboratory analytical results of the soil gas samples collected during the assessment, ECS concluded the following: 3 Smokey Mountain Petroleum Site - Brownfields Environmental Assessment Work Plan Brownfields Project #26090-22-011 ECS Project No. 49-13699-E3 Laboratory analysis of the soil gas samples collected indicated several VOCs at concentrations greater than the laboratory reporting limits, but less than their respective VISLs, except for the concentration of 2-propanol detected in sample SG-2. The 2- propanol concentration detected in the SG-2 sample was greater than its Residential VISL, but less than its Non -Residential VISL. Additionally, the laboratory MDL for benzene and 1,3-butadiene in sample SG-3 were above their residential VISL. Based on the results of the NCDEQ Risk Calculator, the soil gas concentrations identified exceed the residential risk threshold, but not the non-residential worker risk threshold. Following receipt of the LOE from the BRS, a kickoff meeting was subsequently conducted with the BRS on June 8, 2023 to review the earlier assessment findings, and to discuss additional work needed to fill data gaps for BRS. Historical Sample location figures and laboratory analytical data tables are included in Appendix A. This Work Plan was prepared in accordance with the NCDEQ, BRS guidance to address the identified data gaps, generally consisting of the following: • Further assess soil quality in the vicinity of the former USTs; • Further assess groundwater at the site; • Collect additional soil gas data at the site; • Assessment of surface water and sediment of an existing stream, if it will be exposed following development; and • Brownfields property receptor survey. The data obtained from executing this work plan is intended for use by the BRS and not other regulatory programs. Brownfields Protect Contact Information The contact information for the property owner, environmental consultant, and BRS is as follows: Developer's Representative: Mr. Steve Sceranka Buckeye Community Hope Foundation 3021 E. Dublin -Granville Road Columbus, OH 43231 440-567-6069 ssceranka@buckeyehope.org Site Environmental Representative: Mr. Don R. Marlor, P.G. ECS Southeast, LLP 1900 Hendersonville Road Suite 10, Asheville, NC 28803 828-785-4183 dmarlor(a)ecslimited.com 4 Smokey Mountain Petroleum Site - Brownfields Environmental Assessment Work Plan Brownfields Project #26090-22-011 ECS Project No. 49-13699-E3 BRS Contact: Brownfields Redevelopment Section NCDEQ Division of Waste Management BRS Cc: Mr. Kris Riddle Project Manager, BRS kris.riddle(a).deg.nc.gov 2.0 SCOPE OF WORK The objective of this work plan is to collect additional site data to further evaluate the site for redevelopment as multi -family residential, in accordance with the BRS. Based upon the review by BRS of the referenced reports, data gaps were identified which the BRS has requested to be assessed. Proposed additional soil, groundwater, surface water, and sediment sample locations are shown Figure 3. Proposed additional soil gas sample locations are shown on Figure 4. In order to meet the requests of the BRS and address data it identified. The following subsections describe the scope of work is to be conducted under this work plan. The scope of work is to be performed in general accordance with the Minimum Requirements Checklist for Site Assessment Work Plans and Reports issued by the BRS in March 2023. 2.1 Pre -Assessment Tasks Prior to assessment activities, ECS will contact North Carolina One Call (NC811) to identify public underground utilities at the site. This notification requires 72-hour response time exclusive of weekends and holidays. Our experience indicates that 811 normally does not locate private utilities. As such, ECS will provide a private utility locator to locate subsurface utilities in proposed soil boring and soil gas sample locations to clear utilities at the proposed boring locations. 2.2 Receptor Survey ECS will complete a Brownfields Property Receptor Survey for the Subject Site and submit with the Brownfields Assessment Report. 2.3 Soil Assessment ECS will contract with a drilling firm that employs a North Carolina Certified Well Contractor (NCCWC) to advance six (6) soil borings for the collection of soil samples for laboratory analysis in the areas of the former USTs and the future proposed stormwater retention system. The borings will be advanced using a direct push technology (DPT) track -mounted drill rig. Figure 3 has been included as a proposed soil boring location map for borings identified as SB-11 through SB-16. The depth of the borings will be advanced to approximately five (5) to six (6) feet below ground surface (bgs), which is the approximate depth to the site groundwater, based on the depths detected during the Limited Soil and Groundwater Assessment. The exact locations of the soil borings will be determined in the field to avoid buried utilities, although will be placed in the approximate locations illustrated on Figure 3 and advanced to the approximate depths as summarized in Table 1. Soil borings will be abandoned by the drilling firm upon completion of the sampling event. 2.4 Sediment Sampling ECS is proposing to collect one sediment sample from the portion of the existing on -site stream that will remain exposed following completion of development activities, which is located on the northeast portion of the site, as indicated on Figure 3. The actual location of the sediment samples will be determined during the sampling event but are expected to be in areas that visually appear 5 Smokey Mountain Petroleum Site - Brownfields Environmental Assessment Work Plan Brownfields Project #26090-22-011 ECS Project No. 49-13699-E3 to contain sediment runoff from the site. 2.5 Surface Water Sampling The surface water sampling will be conducted in general accordance with the USEPA Region 4, LSASD, SOP for surface water sampling (ID No. LSASDPROC-201-R6), effective date of April 23, 2023. ECS is proposing to collect one surface water sample from the portion of the existing on -site stream that will remain exposed following completion of development activities, which is located on the northeast portion of the site, as indicated on Figures 3. 2.6 Groundwater Assessment ECS will contract with a drilling firm that employs a NCCWC to install three (3) permanent monitoring wells for groundwater sample collection. The borings will be advanced using hollow stem augers with a track -mounted DPT drill rig. Proposed monitoring wells are to be identified as MW-1 through MW-3 and their approximate proposed locations are illustrated on Figure 3. The exact locations of the wells will be determined in the field in order to avoid buried utilities. The wells are proposed to be drilled to approximately 15 feet below bgs (approximately 5 to 10 feet into the shallow groundwater table based upon prior assessment data available for the site). The monitoring wells will be constructed per North Carolina Administrative Code (NCAC) 2C well construction standards utilizing 2-inch diameter PVC well screen (0.010-inch slot size) and riser pipe with its screen straddling the water table. 2.7 Exterior Soil Gas Assessment Five (5) exterior soil gas samples will be collected. There will be three (3) exterior soil gas samples (SG-10, SG-11 and SG-1 3) collected in the vicinity of the locations where previous exterior soil gas samples (SG-4, SG-5, and SG-6) were attempted to be collected. Additionally, SG-11 has been placed in the location of the proposed elevator shaft. One (1) soil gas sample (SG-9) will be collected from the western stairwell of the building footprint and one (1) additional soil gas sample (SG-12) will be collected from stairwell located in the southern portion of the building. Figure 4 shows the proposed exterior soil gas sample locations superimposed over proposed construction details proved by the PD. The exact locations of the soil gas vapor points will be determined in the field in order to avoid buried utilities. SG-9, SG-10, SG-11, SG-12 and SG-13 will be collected at an approximate depth of 4 feet (bg) due to shallow groundwater at the site. The borings for the exterior soil gas sample points will be conducted by advancing a macrocore soil sampler with a DPT drill rig. Proposed exterior soil gas sample depths with additional descriptions are included in Table 1. 2.8 Additional Tasks The top of casing for each of the proposed permanent monitoring wells will be surveyed by a North Carolina Licensed Surveyor upon completion of the wells. This data along with depth to groundwater data will be used to calculate the groundwater elevation at each monitoring well which in turn will be used to estimate the groundwater flow direction. The surveyor will also determine the horizontal location of each to the proposed soil borings, exterior soil gas monitoring points, and monitoring wells as well as the elevation of the ground surface at each of these sample points. The data collected by the surveyor will be tabulated and included in the Brownfields Assessment Report. Following receipt of laboratory results and approval by BRS, the permanent monitoring wells will be abandoned by the drilling firm prior to construction activities. Well construction completion and abandonment forms will be provided in the Brownfields Assessment Report. Borings logs for the proposed soil and groundwater sample locations will be completed in the Brownfields Assessment Report. Smokey Mountain Petroleum Site - Brownfields Environmental Assessment Work Plan Brownfields Project #26090-22-011 ECS Project No. 49-13699-E3 The surface water and sediment sample location will be horizontally located using a hand-held GPS with sub -meter accuracy. 2.9 Reporting After receipt of the final laboratory reports, a Brownfields Assessment Report summarizing the methods utilized and results of the sampling outlined in this work plan will be submitted to the BRS for review. A groundwater elevation map will be included int the final report based on the survey data collected as discussed above. The soil and sediment detections will be compared to the current version of the NCDEQ, Residential Preliminary Soil Remedial Goals (PSRGs). The surface water detections will be compared to the current version of the NCDEQ 15A NCAC 02B Surface Water Quality Standard (NC2BSWQS). The groundwater detections will be compared to the current version of the NCDEQ 15A NCAC 02L Groundwater Quality Standards (NC2LGWQS) and the Residential Vapor Intrusion Screening Levels (VISLs) for groundwater. The exterior soil gas detections will be compared to the current version of the NCDEQ, Residential VISLs for exterior soil gas. Additionally, if positive detections are noted, the soil, groundwater, and exterior soil gas sample results will be input into the NCDEQ Risk Calculator to further evaluate the risk thresholds. 3.0 SAMPLING METHODOLOGY 3.1 Soil Sample Collection Soil sampling will be conducted in general accordance with the NCDEQ, Inactive Hazardous Sites Program Guidelines for Assessment and Cleanup (September 2022). The DPT drill rig will advance borings from ground surface to termination depths ranging from approximately 6 feet bgs. One discreet VOC soil sample will be selected from each boring under the supervision of ECS' field environmental professional. One composite soil sample will be collected for SVOCs, the eight metals regulated under the Resource Conservation and Recovery Act (RCRA 8 Metals), and hexavalent chromium from each boring. The soils from each boring will be evaluated by removing a liner filled with soil from the DPT macrocore sampler, then cut open to expose the soil. An aliquot of soil from approximately 0 feet to 3 feet bgs and 3 feet to 6 feet bgs will be directly into laboratory supplied, pre -preserved sample container. A second aliquot of the soil will be placed directly into resealable plastic bag to screen for relative levels of volatile organic vapors using a photoionization detector (PID) or similar device and for composite sampling purposes. One sample will be selected from each boring from the interval (0 feet to 3 feet bgs or 3 feet to 6 feet bgs) with the highest PID reading and will be submitted for VOC analysis. If elevated volatile organic vapor concentrations or visual/olfactory observations indicate evidence of soil impacts, ECS will denote these observations on the soil boring log. Borings will be abandoned by the drilling firm upon completion in general accordance with NCAC 2C standards. The soil borings will be advanced using a macrocore soil sampler driven by a DPT drill rig. The borings may be limited by refusal from buried material from the prior development. If groundwater is encountered prior to reaching the proposed depths, the apparent groundwater depth will be noted, and the soil sample selected for laboratory analysis will be collected from soils above the apparent soil -groundwater interface. The discrete soil samples are to be analyzed by EPA Method 8260 for VOCs. The composite soil samples are to be analyzed by EPA Method 8270 for SVOCs, EPA Method 6020/7471 for RCRA 8-Metals, and hexavalent chromium by EPA Method 7199 in accordance with the attached Table 1. VOC samples will be taken as described above; soil that is containerized immediately in the interval of the screened soil will be submitted for VOC analysis. The soil samples will be placed directly into laboratory provided, pre -preserved sample containers, and placed in a cooler on ice. The samples will be labeled as to sample ID, ECS project number, sample date and time, 7 Smokey Mountain Petroleum Site - Brownfields Environmental Assessment Work Plan Brownfields Project #26090-22-011 ECS Project No. 49-13699-E3 preservative, and requested analysis. The samples will be maintained under chain of custody (COC) protocol throughout the collection, transport, and receipt at the laboratory process. Soil samples will be delivered to the laboratory within 48 hours of collection as reasonably practical. If circumstances do not allow the samples to be delivered within 48 hours, sample coolers will be restocked with ice and stored under COC until delivered to the laboratory. If samples are not delivered to laboratory within 48 hours, ECS will provide documentation that samples were kept on ice and were secure until received by laboratory. Following the collection of representative soil samples from each boring, SVOCs, RCRA 8-Metals, and hexavalent chromium samples will be composited by gently mixing three representative samples collected from each boring within each cell which will result in a single composite sample for each the three cells. Samples will be collected into laboratory supplied/preserved containers. Following collection, they will be placed in an ice -chilled cooler for transportation to the laboratory. Duplicate soil samples will be collected at a rate of one duplicate sample per container type, per field day during the soil assessment for Quality Assurance/Quality Control (QA/QC) purposes. The duplicate soil samples will be submitted to the laboratory for the same soil analyses as the sample they are duplicating (See Table 1). Assuming that unexpected soil conditions are not encountered, at the completion of the soil boring and sampling activities, soil cuttings generated will either be placed back into the various soil borings or spread onsite in the vicinity of the boring locations. Should groundwater be encountered within a boring, bentonite will be added prior to topping the boring with soil cuttings. 3.2 Sediment Sampling ECS will provide a project professional to collect the sediment sample using decontaminated, stainless -steel equipment and/or new, disposable latex or nitrile gloves. After collection, the sediment sample will be placed directly into laboratory provided, pre - preserved sample containers, and placed in a cooler on ice. The sample will be labeled as to sample ID, ECS project number, sample date and time, preservative, and requested analysis. The samples will be maintained under COC protocol throughout the collection, transport, and receipt at the laboratory process. The sediment sample will be delivered to the laboratory within 48 hours of collection. If circumstances do not allow the samples to be delivered within 48 hours, sample coolers will be restocked with ice and stored under chain of custody (COC) until delivered to the laboratory. If the sample is not delivered to laboratory within 48 hours, ECS will provide documentation that sample was kept on ice and was secure until receipt by laboratory. A duplicate sediment sample will also be collected for QA/QC purposes. The duplicate sediment sample will be submitted to the laboratory for the same analyses as the sediment sample it is duplicating (See Table 1). 3.3 Surface Water Sampling ECS will provide a project professional to collect the surface water sample from the onsite stream, assuming it contains water at the time of the sampling event. The surface water sample will be collected by either slowly lowering a new, dedicated and disposable bailer below the water surface to remove water from the water body, or by slowly submerging a laboratory provided, non - preserved sample container below the water surface and allowing to fill up, then decanted into the actual laboratory provided, pre -preserved sample containers. The filled sample containers will be placed in a cooler on ice, along with a completed COC, for delivery to the laboratory. The sample will be labeled as to sample ID, ECS project number, �:3 Smokey Mountain Petroleum Site - Brownfields Environmental Assessment Work Plan Brownfields Project #26090-22-011 ECS Project No. 49-13699-E3 sample date and time, preservative, and requested analysis. The sample will be maintained under COC protocol throughout the collection, transport, and receipt at the laboratory process. The surface water sample will be delivered to the laboratory within 48 hours of collection. If circumstances do not allow the sample to be delivered within 48 hours, sample coolers will be restocked with ice and stored under COC until delivered to the laboratory. If sample is not delivered to laboratory within 48 hours, ECS will provide documentation that the sample was kept on ice and was secure until receipt by laboratory. A duplicate surface water sample will also be collected for QA/QC purposes. The duplicate surface water sample will be submitted to the laboratory for the same analyses as the surface water sample it is duplicating (See Table 1). 3.4 Groundwater Sample Collection The monitoring wells will be developed immediately after installation by over pumping and surging with a surge block. Following a minimum of 24 hours after the monitoring well development activities are complete, the wells will be gauged for depth to groundwater and sampled by low - flow sampling techniques. The groundwater samples will be collected with the use of a peristaltic pump and new clean disposable polyethylene tubing. Water level measurements will be collected during low -flow sampling and ECS will attempt to limit the drawdown in each well to less than one foot. ECS will keep track of the volume of water removed from each well. Groundwater geochemistry measurements including pH, temperature, conductivity, and turbidity will be collected at intervals of approximately 3 to 5 minutes with the use of a flow through cell and water quality meter. Samples will be collected when geochemical parameters have stabilized or after 90 minutes of low flow pumping. Stabilization will be considered to have occurred when three consecutive reading indicate: • pH remains constant within 0.1 Standard Units (SU) • Specific Conductance varies no more than 5 percent • Turbidity varies no more than 10 percent or is less than 10 Nephelometric Turbidity Units (NTUs) Three groundwater samples (MW-1 through MW-3) will be collected into laboratory supplied/pre- preserved sample containers once geochemistry parameter measurements meet the criteria above. The groundwater samples will be submitted for analysis of RCRA 8-Metals by EPA Method 6020/7470 in accordance with the attached Table 1. The filled sample containers will be placed in a cooler on ice, along with a completed COC, for delivery to the laboratory. The samples will be labeled as to sample ID, ECS project number, sample date and time, preservative, and requested analysis. The samples will be maintained under COC protocol throughout the collection, transport, and receipt at the laboratory process. Groundwater samples will be delivered to the laboratory within 48 hours of collection. If circumstances do not allow the samples to be delivered within 48 hours, sample coolers will be restocked with ice and stored under COC until delivered to the laboratory. If samples are not delivered to laboratory within 48 hours, ECS will provide documentation that samples were kept on ice and were secure until receipt by laboratory. In addition to these groundwater samples, one duplicate groundwater sample will be collected for QA/QC purposes. The duplicate groundwater sample will be submitted to the laboratory for the same analyses as the groundwater sample it is duplicating. In addition, ECS will collect one (1) equipment blank sample by pumping distilled water through the tubing used with the peristaltic pump or bailer, depending upon sampling method. See the attached Table 1 for a summary of the groundwater sampling and analysis. 9 Smokey Mountain Petroleum Site - Brownfields Environmental Assessment Work Plan Brownfields Project #26090-22-011 ECS Project No. 49-13699-E3 3.5 Exterior Soil Gas Sample Collection Five (5) exterior soil gas samples will be collected. Soil gas samples (SG-9 through SG-13) will be exterior soil gas samples collected at depth approximately 4 feet bgs. The soil gas sampling will be conducted in general accordance with the NCDEQ Vapor Intrusion Guidance (March 2018, Version 2). The borings for the exterior soil gas sample points will the conducted by advancing a macrocore soil sampler with a DPT drill rig. Samples will be analyzed by EPA Method TO-15 for VOCs, including naphthalene. Refer to Table 1 for proposed sample depths. Once each external boring has reached termination depth, dedicated Nylafow tubing and a stainless -steel expendable implant will be lowered into the boring. Coarse filter sand will placed around and approximately 1 foot above the implant. The remaining space above the sand will consist of bentonite which will be hydrated with distilled water. An air -tight cap will be attached to the above -ground end of the Nylaflow tubing and will remain in place until sampling is performed. The DPT installed exterior soil gas points will be allowed to stabilize for a minimum of 24 hours before soil gas sample collection. The soil gas points will be purged at time of installation. Prior to collecting the soil gas samples in individually or batch certified Summa canisters, a shut- in test will be conducted to assess for leaks. Additionally, the seal of each sampling point will be leak tested using helium gas. A shroud, and a helium detector as recommended in NCDEQ-DWM Vapor Intrusion Guidance. A shroud will be placed and sealed over each sampling point, sample train, and Summa canister. The shroud will be flooded with laboratory grade helium via the hose placed through the shroud wall. The concentration of helium inside the shroud will be measured with a helium detector (Model MGD 2002 Multi -Gas Leak detector or similar device). The sample train and interstitial space of each sampling point will be purged of at least 3 volumes via tubing routed through the wall of the shroud to a syringe. The flow rate during purging will be at a rate of approximately 200 milliliters per minute or less. Following purging, a soil gas sample will be withdrawn and extracted soil gas will be directed to a Tedlar bag and monitored with a helium detector. If the concentration measured in the Tedlar bag is less than 10 percent of the helium concentration inside the shroud, the seal on the sampling point and sampling train will be considered to be tight and not leaking. If a leak is noted, ECS will make adjustments and repeat the testing process. ECS will obtain either one -liter or similar Summa canisters from a commercial laboratory that follows National Environmental Laboratory Accreditation Program (NELAC) standards and participates in the National Environmental Laboratory Accreditation Program (NELAP). Each canister will be pre -cleaned and pre -evacuated so that it is under negative pressure (i.e., under vacuum). The canisters will be individually or batch certified by the laboratory. Each Summa canister will be outfitted with a flow regulator set to 200 milliliters per minute and a vacuum gauge. ECS will check and note the vacuum on each Summa canister before initiating the sampling procedure. If the initial vacuum prior to sample collection is less than 10 percent of the vacuum documented by the laboratory at shipment, the Summa canister will not be used. ECS will open the valve on each Summa cannister to initiate sampling. Flow will be regulated at a rate of approximately 200 mL/min. ECS will terminate the sampling procedure at each sampling point while a vacuum of at least 5 inches of mercury is still present in the canister. ECS will note the vacuum for each canister at the end of the sampling procedure. The vacuum in the canister will be recorded before and after sample collection. Sample collection will terminate when the vacuum reaches approximately 5 inches of mercury (in-Hg). Other parameters that will be measured include ambient temperature before and after sample collection and weather conditions at the time of sample collection. 10 Smokey Mountain Petroleum Site - Brownfields Environmental Assessment Work Plan Brownfields Project #26090-22-011 ECS Project No. 49-13699-E3 The Summa canisters will be submitted to a NELAP certified laboratory for analyses of VOCs including naphthalene by EPA Method TO-15. ECS will request that the laboratory analyze vapor samples for the most current and applicable standards from NELAP. The laboratory will be instructed to use reporting limits below the applicable NCDEQ screening levels to the extent technically feasible and to report the vacuum measurement for each sample canister at receipt by the laboratory. Additionally, the laboratory will report method detection limits and J-Flags in the laboratory analytical report. One (1) duplicate soil gas sample, collected with a sample "T", will to be collected from the approximate proposed soil gas sample location identified as SG-9. The sample, identified as DUP-3, will be submitted for the same analysis as the samples they are duplicating (See Table 1). 3.6 Deviation from Approved Plan This work plan is intended to be dynamic and to be adapted to specific and actual site conditions. Accordingly, should such conditions warrant a change either by addition, deletion, or modification of a procedure, such may be accomplished with agreement between a Buckeye Community Hope Foundation representative and ECS after consultation with, and subject to approval by the Program. Such changes will comply with applicable local, State, and Federal rules and regulations. A written amendment shall be prepared and submitted to the BRS for approval (the use of e-mail correspondence shall suffice for approval, followed by a hard copy or electronic copy provided on Disk or similar media) prior to implementation. Amendments must have the approval of the BRS prior to implementation. 4.0 LABORATORY ANALYSIS 4.1 Soil Analytical Following sample collection, the soil sample (and duplicate) containers will be labeled and maintained under chain -of -custody until delivered to Pace Analytical Services, LLC (Pace) a North Carolina certified laboratory located in Asheville, North Carolina. Pace currently holds NC Lab Certification #40. A COC document will be utilized throughout the collection and transportation of the samples. The discrete and composite soil samples collected from the proposed boring locations will be analyzed for VOCs by EPA Method 8260 or SVOCs by EPA Method 8270, RCRA 8-metals by EPA Methods 6020/7471 and hexavalent chromium by EPA Method 7199 as indicated in Table 1. The laboratory's Reporting Limits (RLs) and/or Method Detection Limits (MDLs) will be reported at or below Residential PSRGs (to the extent feasible), and estimated concentrations between the RL and MDL (i.e., J-Flags) will be reported. A Level II QA/QC package will be reported by the laboratory. 4.2 Sediment Analytical Following sample collection, the sediment sample containers will be labeled and maintained under chain -of -custody until delivered to Pace for laboratory analysis. A COC document will be utilized throughout the collection and transportation of the samples. The sediment sample (and duplicate) from the onsite stream will be analyzed for VOCs by EPA Method 8260, SVOCs by EPA Method 8270, RCRA metals by EPA Method 6020 and 7470; and Cr VI by EPA Method 7199. The RLs and/or MDLs will be reported at or below Residential PSRGs (to the extent feasible), and J-Flags will be reported. A Level II QA/QC package will be reported by the laboratory. 11 Smokey Mountain Petroleum Site - Brownfields Environmental Assessment Work Plan Brownfields Project #26090-22-011 ECS Project No. 49-13699-E3 4.3 Surface Water Analytical Following sample collection, the surface water sample containers will be labeled and maintained under chain -of -custody until delivered to Pace a North Carolina certified laboratory located in Asheville, North Carolina. A COC document will be utilized throughout the collection and transportation of the samples. The surface water sample (and duplicate) collected from the onsite stream will be analyzed for VOCs by EPA Method 8260; SVOCs by EPA Method 8270; and RCRA metals by EPA Method 6020 and 7470; and hardness by EPA Method 200.7. 4.4 Groundwater Analytical Following sample collection, the groundwater sample containers will be labeled and maintained under chain -of -custody until delivered to Pace for laboratory analysis. A COC document will be utilized throughout the collection and transportation of the samples. The groundwater samples (and duplicate) will be analyzed for RCRA 8-metals by EPA Method 6020/7470. The laboratory's RLs and/or MDLs will be reported at or below the NCAC 15A 02L Groundwater Quality Standards and Groundwater Screening Levels (GWSL) for Vapor Intrusion (VI) (to the extent feasible), and J-Flags will be reported. A Level II QA/QC package will be reported by the laboratory. 4.5 Soil Gas Analytical Individually or batch certified 1-Liter Summa canisters utilized for soil gas sampling will be labeled and shipped to a commercial laboratory that follows NELAC standards and participates in the NELAP for analysis of VOCs using EPA Method TO-15, including naphthalene. The laboratory will be instructed to analyze the samples and report MDLs. The laboratory's MDLs will be reported at or below the Residential VISLs (to the extent feasible), and J-Flags will be reported. A Level II QA/QC package will be reported by the laboratory. 5.0 QUALITY ASSURANCE/QUALITY CONTROL 5.1 Soil Samples A duplicate soil sample will also be collected into laboratory supplied, pre -preserved containers. The duplicate soil sample will be submitted for analysis of VOCs by EPA Method 8260 and one duplicate soil sample will be submitted for SVOCs by EPA Method 8270, EPA Method 6020/7471 for RCRA 8-Metals, and hexavalent chromium by EPA Method 7199. Following sample collection, the sample containers will be labeled, placed in a cooler with ice, and delivered to for laboratory analysis. A COC document will be utilized throughout the collection and transportation of the samples. Additionally, since VOCs are being analyzed, a trip blank sample will be included in the cooler and analyzed for VOCs by EPA Method 8260. 5.2 Sediment Samples A duplicate sediment sample will also be collected into laboratory supplied, pre -preserved containers. The duplicate soil sample will be submitted for analysis for VOCs by EPA Method 8260, SVOCs by EPA Method 8270, RCRA metals by EPA Method 6020 and 7470; and Cr VI by EPA Method 7199. Following sample collection, the sample containers will be labeled, placed in a cooler with ice, and delivered to Pace for laboratory analysis. A COC document will be utilized throughout the collection and transportation of the samples. Additionally, since VOCs are being analyzed, a trip blank sample will be included in the cooler and analyzed for VOCs by EPA Method 8260. 5.3 Surface Water Samples A duplicate surface water sample will also be collected into laboratory supplied, pre -preserved containers. The duplicate surface water sample will be submitted for analysis for VOCs by EPA Method 8260; SVOCs by EPA Method 8270; RCRA metals by EPA Method 6020 and 7470; and hardness by EPA Method 200.7. Following sample collection, the sample containers will be 12 Smokey Mountain Petroleum Site - Brownfields Environmental Assessment Work Plan Brownfields Project #26090-22-011 ECS Project No. 49-13699-E3 labeled, placed in a cooler with ice, and delivered to Pace for laboratory analysis. A COC document will be utilized throughout the collection and transportation of the samples. Additionally, since VOCs are being analyzed, a trip blank sample will be included in the cooler and analyzed for VOCs by EPA Method 8260. 5.4 Groundwater Samples A duplicate groundwater sample will also be collected into laboratory supplied, pre -preserved containers. The sample will be submitted for analysis of RCRA 8-Metals by EPA Method 6020/7470. Following sample collection, the sample container will be labeled, placed in a cooler with ice, and delivered to Pace for laboratory analysis. A COC document will be utilized throughout the collection and transportation of the samples. 5.5 Exterior Soil Gas Samples Each Summa canister will be batch certified for the exterior soil gas samples. One duplicate exterior soil gas sample will be collected for laboratory analysis of VOCs including naphthalene by EPA Method TO-15 utilizing a sampling "T". Following sample collection, the sample containers will be labeled, and delivered or shipped to the laboratory for analysis. A COC document will be utilized throughout the collection and transportation of the samples. 6.0 INVESTIGATION DERIVED WASTE MANAGEMENT The investigative derived waste (IDW) expected to be generated includes soil from the soil sampling borings, as well as the borings for the exterior soil gas sampling point installations, and groundwater from the monitoring wells. The soils generated will either be placed back into the various soil borings or spread onsite in the vicinity of the boring locations. IDW generated from the construction, development, and sampling of monitoring wells (i.e., soil cuttings, development water, and purge water) will be managed in general accordance with NCDEQ-DWM-IHSB Program's Guidelines for Assessment and Cleanup of Contaminated Sites (September 2022). IDW will be placed onsite in the vicinity of the monitoring well location, unless impacts are apparent based on field observations (i.e., visual and/or olfactory senses or elevated PID/FID readings), in which case these materials will be containerized. Based on groundwater data from previous assessments, ECS anticipates that groundwater IDW can be pumped to the ground surface in the area of the monitoring well from which it came from. 7.0 REPORTING ECS will prepare a written report documenting the field activities, sampling procedures, laboratory analytical results, conclusions, and recommendations for submission to the BRS. The report will include sample location figures; soil, sediment, surface water, groundwater and soil gas sample result summary tables; and copies of the North Carolina certified laboratory analytical reports. Results will also be input into the Division of Waste Management risk calculator and comparted to Residential risk scenarios. Field sampling forms, soil boring logs, well construction records and field screening calibration documentation will also be included as additional information located in Appendices to the report. The final report will include ECS' Licensed Geologist/Engineering Firm number and bear the seal of the certifying North Carolina Licensed Geologist or Professional Engineer. 13 FIGURES A ineyMtno°�-- Seaucatcher Funnel o 0 0 BullMtn J��iN V9 a v 101 s"o a J Q�E.SP.RINGSR� _) tip{ mI I S yFe Q (�� Pa Q \ f .p J N B 'PO �OR�2 7 o o g FLF�$ — 1 URK RADR x y is l��o tee ASHEV Beverl Hil AA. Haw CreekCID O RD ry Beverly✓Hills O ti ors a F W �yr1 Z C 81 c c � caa Q Psheville ,� � � Site S'ounOfy `b G6n a �.�, 74 'v�- i Asheui'lle Re Creation ; a o �. �c«° e� �� ° " Park Lake �.� �:. ✓' V�Q ��� OP �Q� ._ C) R .worth - �Lake� Kenn North "�FSTIHESTER � I \ � \\ ^�1 SUJq� � 81 � a,� npo 9` qLF SayleS Village o o�oPK J� aoo I f Hemphill Kno _zloo oll FalRview�Ro BLUE RIDGE'= z 1 FAIRVIE o� �a —PARKWAY x Gashes �. joa Trail) odwin �eekC-r ; m ` 25 �eeaa� �� i - Oakley r Woo law Cem i n f l z _ 1 v m WINSTON A _,, 4 ScabRALEIGH RD / �. _i �� /,a 0 's 10000 2000 Source: USGS Topographic Quadrangle Maps: . ASHEVILLE, NC., August 16, 2019 (Left) , OAKLEY DOGWOOD p w 2 a 1 inch -2000 ft.p�. OTEEN NC., August 16, 2019 (Right) R - Figure 1 Topographic Map Smokey Mountain Petroleum N 456-466 Swannanoa River Road Asheville, Buncombe County, NC. 26090 Brownfields Project No. 26090-22-011 ECS Project No. 49-13699-E3 \ N1551010Z Residential N, zoNE x LEGEND -0- - Groundwater Sample (March 2022) `� tea° FMq\ PEMA` 8.34' - Water Level (Feet Below Grade, March 17,2022) Four Star X SIGN �6> EA\ (D - Soil Sample (March 2022) ZONE S`7f — p - Soil Gas Sample (January 2023) \ \ Car Wash BZ>°' GRAVEL DR ` \ZONE AE BORE B-1 FEMA- 1 $16'28465 �,, �Mq�_ Residential \ �R•\ \ X Q�R.4 ""((2PJJ" SYCAMORE 26'42 � nON 3 RO,gO • �' \ \\ \ FOUR STAR CAR \ X �M4 WASH LLC 38• 40.98, 'E �GroNr PIN 9658545717 SCR+ 0.98' JJ > � _ OB 4751/PG 1770 OV�Jr. - \,� \ \ \ \ \S>O}za• nor•$ R \ i SYCAMORE 32' SYCAMORE 23' \ / o, \ h STEEL POST 2 � DST \ / SWANNAROA RIVER Y / S B - 2 \ BORE BIt PINR9658546 060 For r'7'_-7'�_�{��' �`q"`Gallon ASTs SB-5 `-IIST \ DB 1861/PG 157 V(.PJ" / a \\ \\ \ ®0 S vTW-1 s.o4' C ` / 3 AE \\ GAS' \ZONE AE SYCAMORE 18" /� SB-3 m SYCAMORE 1f` A. " GA \\ or►arrB-Gallo �73�\\° C)' BO%ELDER 6'I BORE R] \ • LOC i 10" DB 3520/PG 714 / / \ SB-4 i \ �\\ P \ 5 / / BORE 86 �� tTi' Y� INA i \ _ BIRCH 5• ? TERMINALS / N / / / 5/8' RBF N PIN 965863, ,\ 415'55'19 E RBF" S28M 41"E \ W 5G-8 ■ 3 SYCAMORE 9' UTCHISON BIGGS` _ OB 1039/PI V 9.86" 9.35' 3 \ m �\ \ �`4+°� BO�B10 30 F T SANITARY N>7'49 ,Z 8, SE EASEMENT S/^_7 / 99.Si DB 1675/F� SG E 98 BY ORE 8' • .ORBS \\ Z \\ \LAG NK \ CEPT161/d°�Mer / / $G-6 / / / U ow•:. wr FormprProperty Boundary TW-5 Loadin / / k 8.03' / SB-9 Ar��� SG-5 . Former / HARDWOOD 12" $�-, / Buildn,g l 8.34 TW-2 ■ SG-4 D " PIN 9658631609 O p HARDWOOD 11" DB 3647/PG 593 \ \ O\ PO\ 8,01' OSB-$ / l X4 17'1 - PB 192 /PG 169 ■ SG-3 // / Former Gasoline Dispensers %\SB-6 / ■ / BDRI SB-1 3 \ OLLA SQ' �Ah SG-1 SG-2 J 4 ■ WO ORE B14 TW-6 MORE 9' APPROXIMATE EASEMENT \ _9'Zy, $b \4cA` \ ��\\ `. • 6.56' SYCAMORE 4" SHOWN ON PS 104/PG 69 F \ POSTS POSTS\ �[� UP orm LkV s BORE B15 SYCAMORE 5" • T \ HARDWOOD 6' 722F,_6K \\\ \ \POSTS BIRCH 5' ]0 FOOT WID P&L EASEMENT SYCAMORE 4" CL�•��l \ \� \\ DB895 255 SYCAMORE 5" EXCEPSYCAMORE 12" V WOOD POST �00 \ \\\ y, `\ � HARDWOOD 10" �L�r UP HARDWOOD 8' HARDWOOD 5' TW-3 S CAMDRE 18'\' 2 \FOOT WIDE 0 �Oy\ 8.63' O \ HARDW'OOOT]" ALDI , S� \ iLSNC EASEMENT ,r\ 9� �, f \ WV(2� DA �796/PG 245WM 9 !F \ ry9 \ DP ,,pppnWV POS gFN dOARO SICF: "BAR UP \ . Scale P OSED 12 FOOT \ n 57'!4'V WAY 7 GHT-OF-3. y_ 80�ON 31, Survey Source: ALTA/NSPS Land Title Survey, Stamped December 27, 2022, by Ed Holmes & Associates 1 in6h f . Aerial to Source: Date, November 2020, by Google Earth Figure 2 Historic Sample Locations Smokey Mountain Petroleum N 456-466 Swannanoa River Road Asheville, Buncombe County, NC. 26090 Brownfields Project No. 26090-22-011 ECS Project No. 49-13699-E3 Four Star Car Wash / C Forme, / BuildirX LEGEND Proposed Soil Sample Stormwater "i - Proposed Groundwater Monitoring Well Retention System A - Sediment/Surface Water Sample ^D RNOR \ \ \\ J eslden Go p SB-16 ors Vie \ l ZOrS da ,H Former 4,000- Ilon Ts \ // 1 ! / MW-1 1 / � •M �2 / r \ ---- ---- --- ---- \/ Conceptual Building Layout Source: Architectural Site Plan, Date (Incomplete), by John M. Haytas Survey Source: ALTA/NSPS Land Title Survey, Stamped December 27, 2022, by Ed Holmes & Associates Aerial Photo Source: Date, November 2020, by Google Earth r, 20,000-Gallon ASTs, LkS�E'D�-1/SW-1 Property Boundary ig l Fo rner l / eutl Ilrng / SB-11 Former Gasoline Dispensers C�/C FgSEM %iJ[r ST N aMN Scale 0 35 70 OD°'�c" sL1 inch =70 ft. Figure 3 Proposed Soil, Groundwater, and Sediment/Surface Water Sample Locations Smokey Mountain Petroleum N 456-466 Swannanoa River Road Asheville, Buncombe County, NC. 26090 Brownfields Project No. 26090-22-011 ECS Project No. 49-13699-E3 Four Star \ Car Wash ZONE AE \ \ FOUR STAR CAR \ WASH LLC PIN 9658545117 OB 4751/PG 1770 f BZ>p• GRAVEL DR \ \ \ \ / FEMA— S16'28'24" oo�itry \ �Mq� Residential LQ' ? FEM \ 40.98''41'E ^ > Z�X 0.98' V Ve 8� ZONE AE \ S>OZ SYCAMORE 32" $�SYCAMORE 23' \ V Roaof \ B, STEEL POST \ \ \ �/ / • \ EfS EPOST S>Zy9Z E 95 Bq• L\ Former 4,000-Gallon ASTs os o / ZONE AEZONE . \x� \\AE SYCAMORE 18" �\ n YCAM Former 20,000-Gallon ASTs,\ c \ B..RE LOC i 10" DB 351 a - BDXELDER 6 \ \\' C, .5 Q / 3R \ SG-9 \ \, �n� 5 / / 0 BORE 86 �\ g/In CAROL'' BIRCH 5" h TERN;. O8'41"E i . 5/8" RBF N PIN 96 Ic / UTCHISON BIGGS OB 10 SYCAMORE 9' \�•P BOR B10 /� C v�T \ \/ A17 q 12 W AG PIN \�,/�` ,/O-rr�1er SYCAMORE 99.5/ _RB5 \LAG' `; / U cvreurcr s• B g SG-10 _Former / l urldfry l �_ Property Boundary �� \ �,�° / �� Loading* l For l 4 \ u\ SG-11 rya SG-13-BUi1diri� l HARDWOOD I2" \ ALDI LLC D°_ PIN \/ PS 192/PG 169US 36471PG 59B Former Gasoline Dispensers Bl � � ZaNL e• • � \\ APPROXIMATE EASEMENT \ 'Zy $b y\4cA \ \ SYCAMORE 4" SHOWN ON PS 104/PG 69 \ .yam `f v a F \ 'TEEN • , p 'TEEN " UP 9 "I �l Former USTs BORE B15 SYCAMORE 5• HARD W000 6'E \ ZONE A Y BIRCH 5" " IDY- Residential 'q\ REAI_r ZONE X 99999 G \ 1" BAR PIN 965853 LEGEND 6puN0 \ q�rF 9 \\ \ BUNCOMBE C °"���" \\�� Proposed Soil Gas Sample SIGN i ZONE BORE B-t SYCAMORE 26' SWANNANOA RIVER BORE B40ECS ROAD U-C PIN 9658546060 OR1861/PG 457 70 FOOT WID P&L EASEMENT IDS 895 255 SYCAMORE 5 E%CEP 110 000, HARDWOOD 5' i O 12 FOOT WIDE PSNC EASEMENT \ \ DA 3706/PG 245 OCr \ EXCEP710N 9 �. \ �r PROPOSED 12 FOOT R� RIGHT-OF-WAY .a 3550/PG 37D 0" ON e Conceptual Building Layout Source: Architectural Site Plan, Date (Incomplete), by John M. Haytas Survey Source: ALTA/NSPS Land Title Survey, Stamped December 27, 2022, by Ed Holmes & Associates Aerial Photo Source: Date, November 2020, by Google Earth BAR Wq�\ E-.U SYCAMORE 4" CAMORE 12" POSTOOD 10" 3 HARDWOOD 8" SYCAMORE 16" WDoo ALDI VAULT Figure 4 Proposed Soil Gas Sample Locations Smokey Mountain Petroleum N 456-466 Swannanoa River Road Asheville, Buncombe County, NC. 26090 Brownfields Project No. 26090-22-011 ECS Project No. 49-13699-E3 Scale 0 35 70 1 inch =70 ft. TABLE TABLE 1 - PROPOSED SAMPLE LOCATIONS & ANALYSIS SMOKEY MOUNTAIN PETROLEUM BROWNFIELDS PROJECT ID.: 26090-22.011 ECS PROJECT NO. 49-13669-E3 Sample Media Laboratory Analysis & Analytical Method Proposed Boring Depth VOCs SVOCs RCRA Metals T Cr VI Hardness Composite Soil Samples S8-11 NA 8270E 6020C/7471 7199A NA To approximate groundwater table* SB-12 NA 8270E 6020C/7471 7199A NA To approximate groundwater table* SB-13 NA 8270E 6020C/7471 7199A NA To approximate groundwater table* SB-14 NA 8270E 6020C/7471 7199A NA To approximate groundwater table* SB-15 NA 8270E 6020C/7471 7199A NA To approximate groundwater table SB-16 NA 8270E 6020C/7471 7199A NA To approximate groundwater table Discrete Soil Samples B-11G 8260D NA NA NA NA To approximate groundwater table* B-12G 8260D NA NA NA NA To approximate groundwater table* B-13G 8260D NA NA NA NA To approximate groundwater table* B-14G 8260D NA NA NA NA To approximate groundwater table* B-15G 8260D NA NA NA NA To approximate groundwater table B-16G 8260D NA NA NA NA To approximate groundwater table Sediment Sam le SED-1 8260D 8270E 6020C/7471 7199A NA NA Surface Water Sample SW-1 8260D 8270E 6020C/7470 NA 200.7 NA Groundwater Samples MW-1 NA NA 6020C/7470 NA NA NA MW-2 NA NA 6020C/7470 NA NA NA MW-3 NA NA 6020C/7470 NA NA NA Soil Gas Samples SG-9 TO-15 NA NA NA NA 4 Feet SG-10 TO-15 NA NA NA NA 4 Feet SGA 1 TO-15 NA NA NA NA 4 Feet SC-12 TO-15 NA NA NA NA 4 Feet SG-13 TO-15 NA NA NA NA 4 Feet Quality Assurance Samples DUP-1 (soil) NA 8270E 6020C/7471 7199A NA NA DUP-2 (soil) 8260D NA NA NA NA NA DUP-3 (soil gas) TO-15 NA NA NA NA NA DUP-4(sediment) 8260D 8270E 6020C/7471 7199A NA NA DUP-5 (surface water) 8260D 8270E 6020C/7470 NA 200.7 NA DUP-6 (groundwater) NA NA 6020C/7470 NA NA NA EQUIP BLANK 1 (groundwater) NA NA 6020C/7470 NA NA NA EQUIP BLANK 2 (soils) 8260D 8270E 6020C/7471 7199A NA NA TB (trip blank soils) 8260D NA NA NA NA NA TB (trip blank sediment) 8260D NA NA NA NA NA TB(trip blank surface water 8260D NA NA NA NA NA Notes: *Groundwater estimated to be 6 to 8 feet below ground surface (bgs) in this area (TW-6 was previously measured at 6.56' bgs) VOCs = Volatile Organic Compounds SVOCs = Semi -Volatile Organic Compounds RCRA = Resource Conservation & Recovery Act Cr VI = Hexavalent Chromium NA = Not Analyzed for the analysis APPENDIX A Historical Sample location Figures and laboratory Analytical Data Tables 70 1. Piney Mtn - ®��1111��1����1111�iN1�7,Iil 4::�• N SOURCE: ��� USGS TOPOGRAPHIC MAP ASHEVILLE OTEEN, NORTH CAROLINA QUADRANGLE DATED 2019 SCALE: 1:24,000 SITE 0 A I 1 TM -/S t x a -rarKv a - ASIle e Re re ign fore Park A ke I! U SLUE RIDGE',,• Gaylie5�-- , PAR ',WAY FIGURE 1 SITE TOPOGRAPHIC MAP GOVERNORS VIEW ROAD ASHEVILLE, BUNCOMBE COUNTY, NORTH CAROLINA ECS PROJECT NO. 49:13699-D ti .r qr�,_ �• • r• 5;go •� ,1 e f �- {IL aa,, r ~ � �' �• _ -� FORMER SB-2 • BUILDINGS r 1• ..� S13-5 ej + • r- SB-3 _ 1 r• i FORMER •• r~ 4,000-GALLON I TW_1 ASTs ' - - SB-4 SB-10 _ - i TW-2 ' ti TW-5 SB-9 i �•' SB-7 �* Or r FORMER TW-4 SB-1 r- GASOLINE , ..�• DISPENSERS R••• SB-6 + - z SB-8 • - FORMER _ •`• r a 20,000-GALLON FORMER TW-6 •• •• ASTs LOADING AREA • 1 r TW-3 ' FORMER USTs (previously assessed) -loI�r . i LEGEND N APPROXIMATE GROUNDWATER SAMPLE LOCATION ® APPROXIMATE SOIL SAMPLE LOCATION wg APPROXIMATE SITE BOUNDARY FIGURE 2 SOURCE: SAMPLE LOCATION MAP GOOGLE EARTH, DATED 2020 GOVERNORS VIEW ROAD ASHEVILLE, BUNCOMBE COUNTY, SCALE: NORTH CAROLINA = 100 FEET ECS PROJECT NO. 49:13699-D TM Table 1 Summary of PID Readings Governors View Road Soil and Groundwater Assessment Governors View Road Asheville, Buncombe County, North Carolina ECS Project No.: 49:13699-D Sample ID Sample Depth (ft bgs) PID Reading (ppm) 0.0-1.0 0.3 1.0-2.0 6.9 2.0-3.0 126 SB-1 3.0-4.0 131 4.0-5.0 127 5.0-7.5 95 0.0-1.0 0.0 1.0-2.0 6.5 5B-2 2.0-3.0 0.5 3.0-4.0 0.0 4.0-5.0 0.1 0.0-1.0 0.5 1.0-2.0 4.5 5B-3 2.0-3.0 1.5 3.0-4.0 1.1 4.0-5.0 0.8 0.0-1.0 7.8 1.0-2.0 0.9 5B-4 2.0-3.0 0.2 3.0-4.0 0.1 4.0-5.0 0.3 0.0-1.0 0.1 1.0-2.0 0.1 5B-5 2.0-3.0 0.3 3.0-4.0 4.2 4.0-5.0 6.3 0.0-1.0 2.3 1.0-2.0 0.7 5B-6 2.0-3.0 0.0 3.0-4.0 0.0 4.0-5.0 0.0 0.0-1.0 0.3 1.0-2.0 0.5 SB-7 2.0-3.0 0.7 3.0-4.0 3.5 4.0-5.0 1.1 0.0-1.0 0.4 1.0-2.0 2.9 5B-8 2.0-3.0 0.8 3.0-4.0 4.5 4.0-5.0 0.6 0.0-1.0 0.7 1.0-2.0 0.4 SB-9 2.0-3.0 3.2 3.0-4.0 8.1 4.0-5.0 16.4 0.0-1.0 0 1.0-2.0 0.1 SB-10 2.0-3.0 0.5 3.0-4.0 0.3 4.0-5.0 6.8 Notes PID = photoicnization detector ppm = parts per million ft bgs = feet below the ground surface Bold intervals were selected for analysis Table 2 Summary of Soil Analytical Results Governors View Road Soil and Groundwater Assessment Governors View Road Asheville, Buncombe County, North Carolina ECS Project No.: 49:13699-D VOCs by EPA Method 8260 Notes: Results presented in milligrams per kilograms (mg/kg) Targeted Compounds not shown were not detected above laboratory reporting limits MSCCs = Maximum Soil Contaminant Concentration Levels (March 2022) VOCs = Volatile Organic Compounds SVOCs = Semi -Volatile Organic Compounds J = Estimated concentration detected between laboratory method detection limit and reporting limit Table 3 Summary of Groundwater Analytical Results Governors View Road Soil and Groundwater Assessment Governors View Road Asheville, Buncombe County, North Carolina ECS Project No.: 49:13699-D VOCs by EPA Method 8260 SVOCs by EPA Method 8270 U 0 c c U 0 Sample ID Sample Date c W Z X C UJ UJ Z C E 6 TW-1 03/14/22 <0.34 <0.30 <0.64 <0.48 <0.34 BMDL <1.7 <1.6 <1.7 BMDL TW-2 <0.34 <0.30 <0.64 <0.48 <0.34 BMDL <1.7 <1.6 <1.7 BMDL TW-3 <0.34 <0.30 <0.64 <0.48 <0.34 BMDL -1.7 <1.6 <1.7 BMDL TW-4 <0.34 <0.30 <0.64 <0.48 <0.48 BMDL 12.7 2.81 <2.1 BMDL TW-5 <14 2.0J 301 BMDL 55.7 102 BMDL TW-6 5.1 193 307 <2.4 BMDL 70.3 126 BMDL NC2LGWQ5 1 600 6 600 500 Various 1 30 6 Gross Contimantion Levels for Groundwater 5,000 8,000 6,000 260,000 50,000 Various 1,000 12,000 6,000 Residential Groundwater VISL 1.6 3.5 4.6 3,800 77 Various NA NA 5 Non -Residential Groundwater VISL 6.9 15 1 20 16,000 320 Various NA NA 20 Notes: Results presented in milligrams per kilograms (ug/L) BMDL= Below Method Detection Limit Targeted Compounds not shown were not detected above laboratory method detection limits VOCs = Volatile Organic Compounds SVOCs = Semi -Volatile Organic Compounds NC2LGWQS = North Carolina 2L Groundwater Quality Standards Residential Groundwater VISL = NCDEQ Residential Groundwater Vapor Intrusion Screening Level (January 2022) Non -Residential Groundwater VISL = NCDEQ Non -Residential Groundwater Vapor Intrusion Screening Level (January 2022) Bold = Concentration exceeeds NC2LGWQS Light Shaded Cell = Concentration Exceeds Residential Groundwater VISL Dark Shaded Cell = Concentration Exceeds both Residential and Non -Residential Groundwater VISLs 70 1. Piney Mtn - ®��1111��1����1111�iF11�7,1i1 4::�• SITE JS so Q t �4��.. •.. a Pa`rkwa Asheu[te Re region �or�esl Park b ke ICJ BLUE RIDGE f, Gaylies "PARKWAY ` / r•.. +Greek.' 10 w�,G wml,./ N wF SOURCE: FIGURE 1 SITE TOPOGRAPHIC MAP S � USGS TOPOGRAPHIC MAP GOVERNORS VIEW ROAD ASHEVILLE OTEEN, NORTH CAROLINA ASHEVILLE, BUNCOMBE COUNTY, QUADRANGLE DATED 2019 NORTH CAROLINA SCALE: 1:24,000 ECS PROJECT NO. 49:13699-F TM S1EEL F .fir r f SWAMANCA BRIER ilApbwom { a f 1 F]G-` f 4 GCS Pri, 965854606C ' � 1w AF}�f'G 451 ,•fib 7 $YCAA7 ib' SYCAMCNE i0' REALTY CMPANY K aC �� � Ix,;�ST ]D' •7g 35.2G%r� 714 ! r DORE 86 s 1 'h H1td 3G rwT SIINlTART SYf.IWL12c 6' £LAC Mill � �4 Jjj/ SG-7 � ■ �� f � nn� �e U . i 1 17iA HARD ' r BORE A13 L gcy'yrj r '4'RDw= 7, Yx - / 4 �I SYCAmORE 9" N` AYCAMORE �j a QDS 4 1 , ul } SG-1 ■ SYGaMCRE WMIN'.7D 6 SG-2 f } f ( of •� QB $gSf G ]R6 'AM, s+5 12' \ At 4 X S]f PTL�'i 6 VY6:]43 20SY \ dl!l NIL Lpp • ,� \ },'\f �7 LEGEND N • APPROXIMATE SOIL GAS SAMPLE LOCATION APPROXIMATE SOIL GAS SAMPLE LOCATION APPROXIMATE PROPOSED BUILDING BOUNDARY THAT WAS UNABLE TO BE COLLECTED s SAMPLE LOCATION MAP SOURCE: GOVERNORS VIEW ROAD GOOGLE EARTH, DATED 2020 ASHEVILLE, BUNCOMBE COUNTY, NORTH CAROLINA ECS PROJECT NO. 49:13699-F T�� TABLE 1 SUMMARY OF LEAK TESTING RESULTS FORMER SMOKEY MOUNTAIN PETROLEUM COMPANY SITE 21 AND 99999 GOVERNORS VIEW ROAD ASHEVILLE, BUNCOMBE COUNTY, NORTH CAROLINA ECS PROJECT NO. 49-13699-F Sample ID Helium Concentration in Shroud (%) Helium Concentration in Shroud (ppm) Helium Readings from Sample Train (ppm) 1 2 3 1 2 3 1 2 3 SG-1 3.4 3.6 3.1 34,000 36,000 31,000 0 0 0 SG-2 3.2 4.2 4.1 32,000 42,000 41,000 0 0 0 SG-3 4.8 3.2 4.8 48,000 32,000 48,000 0 0 0 SG-7 4.4 3.6 3.1 44,000 36,000 31,000 0 0 0 SG-8 3.8 3.5 3.6 38,000 35,000 36,000 0 0 0 Notes: ppm = parts per million Table 2 SUMMARY OF SOIL GAS ANALYTICAL RESULTS FORMER SMOKEY MOUNTAIN PETROLEUM COMPANY SITE 21 AND 99999 GOVERNORS VIEW ROAD ASHEVILLE, BUNCOMBE COUNTY, NORTH CAROLINA ECS PROJECT NO.: 49:13699-F PARAMETER ANALYTICAL RESULTS (µg/m3) RESIDENTIAL VISL NON-RESIDENTIAL VISL Sample ID SG-1 SG-2 SG-3 SG-7 SG-8 Initial Sample Vaccum Reading (in Hg) -27 -29 -29 -26 -26 Final Sample Vaccum Reading (in Hg) -5 -5 -5 -5 -5 Sample Date 01/23/23 01/20/23 01/20/23 01/20/23 01/20/23 Volatile Organic Compounds (VOCs) by EPA TO-15 Acetone 9.98 172 <139 <1.39 6.06 NS NS Benzene <0.228 <0.228 <22.8 2.46 4.98 12 160 1,3-Butadiene <0.230 <0.230 <23.0 <0.230 4.00 J 3.1 41 Carbon Disulfide <0.317 5.82 <31.7 <0.317 0.520 J 4,900 61,000 Chloromethane <0.213 0.609 <21.3 <0.213 0.213 630 7,900 yclohexane <0.259 12.9 406 36.2 0.300 J 42,000 530,000 thanol 18.3 17.2 4,530 <0.500 49.0 NS NS thylbenzene IE <0.362 <0.362 <36.2 1.98 0.702 J 37 490 -Ethyltoluene '0.384 <0.384 <38.4 0.416 J 0.594 J NS NS Trichlorofluoromethane (Freon 12) 0.815 J <0.460 <46.0 ,0.460 1.21 NS NS Dichlorodifluoromethane 1.16 <0.678 <67.8 <0.678 5.00 700 8,800 Heptane (Heptane, N-) 0.765 J <0.425 <42.5 34.0 1.19 2,800 35,000 n-Hexane '0.726 24.5 1,330 49.4 2.24 4,900 61,000 Methylene Chloride 0.472 J <0.340 <0.340 0.358 J 3,400 53,000 2-Butanone (MEK) 0.793 J 42.2 127 J <0.240 0.837 J 35,000 440,000 2-Propanol (Isopropanol) 1.64 J 17.8 10,500 <0.649 3.52 1,400 18,000 Propylene (Propene) <0.160 176 <16.0 <0.160 22.6 21,000 260,000 Tetrachloroethene (Tetrachloroethylene) <0.553 <0.553 ___ZMF<551EEff 36.1 2.29 280 3,500 Toluene 1.64 J 15.0 <32.8 13.2 5.05 35,000 440,000 1,2,4-Trimethyl benzene <0.375 <0.375 <37.5 1.28 0.422 J 420 5,300 1,3,5 -Trimethyl benzene '0.382 <0.382 <38.2 0.486 J :0.382 420 5,300 2,2,4-Trimethylpentane 0.920 J 18,200 13,000 1.83 NS NS m,p-Xylene 0.585 <0.5K 59.0 J 7.20 2.29 700 8,800 o-Xylene <0.359 <0.359 2.68 0.767 J 700 8,800 Notes: Results presented in micrograms per cubic meter (µg/m3) in Hg = Inches of mercury Residential VISL = NCDEQ-DWM Residential Vapor Instrusion Screening Level (VISL) Indoor Exterior and Sub -Slab Screening Level (January 2023) Non -Residential VISL = NCDEQ-DWM Non -Residential Vapor Instrusion Screening Level (VISL) Indoor Exterior and Sub -Slab Screening Level (January 2023) <0.160 = Concentration not detected above its laboratory method detection limit NS = No Standard Established J = Estimated concentration detected between laboratory method detection limit and reporting limit VALUE Concentration reported above Method Detection Limit (MDL) VALUE Concentration reported above Residential VISL VALUE Concentration input into risk calculator as worst case scenario Page 2 of 2