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Home My WebLink About25046 -Harrelson Ford Soil Excavation Work Plan_20221122 Via Email November 22, 2022 NCDEQ – Division of Waste Management Brownfields Program 1646 Mail Service Center Raleigh, North Carolina 27699-1646 Attn: Mr. Bill Schmithorst, PG Re: Soil Excavation Work Plan Harrelson Ford 6500 South Boulevard Charlotte, North Carolina Brownfields Project No. 25046-21-060 H&H Project No. ACO-002 Dear Bill: 1.0 Introduction and Background On behalf of TAC Harrelson Ford, LLC (Prospective Developer or PD), Hart & Hickman, PC (H&H) has prepared this Soil Excavation Work Plan (Work Plan) for the Harrelson Ford Brownfields property (Brownfields Project No. 25046-21-060) located at 6500 South Boulevard in Charlotte, Mecklenburg County, North Carolina (Site or subject Site). A Site location map is provided as Figure 1, and the Site and surrounding area are shown in Figure 2. The Site consists of one parcel (Mecklenburg Parcel ID No. 17304204) that totals approximately 10.6 acres of land located in a mixed light industrial, commercial, and residential use area approximately five miles south of uptown Charlotte. The northern portion of the Site is developed with an unoccupied approximate 2,000 square foot (sq ft) warehouse (Building 1), an approximate 9,300 sq ft service garage (Building 2), an unoccupied approximate 20,000 square foot (sq ft) vehicle showroom and service garage (Building 3), and one unoccupied approximate 14,000 sq ft Mr. Bill Schmithorst, PG November 22, 2022 Page 2 https://harthick.sharepoint.com/sites/masterfiles-1/shared documents/aaa-master projects/ardent - aco/aco.002 - 6500 south boulevard/soil removal work plan/25046 - soil excavation work plan - harrelson ford.docx service garage (Building 4). The remaining portions of the Site consist of paved access drives, parking areas, and equipment material staging areas. The Site buildings are shown in Figure 2. The proposed redevelopment of the Brownfields property includes razing the existing Site buildings and leveling the Site for the construction of approximately 175 residential townhome units. This Work Plan has been prepared to address the North Carolina Department of Environmental Quality (DEQ) Brownfields Program request to identify areas of soil impacted with tetrachloroethene (PCE) beneath Building 3 and Building 4 and remove the impacted soil prior to redevelopment activities. A summary of background information and previous assessment activities conducted at the Site is provided below. 1.1 Background Information The Site consisted predominately of agricultural land (likely row crops or hayfields) with a residence and ancillary structures from at least the late 1930s until the late 1940s. By the early 1950s, agricultural areas at the Site transitioned to undeveloped wooded land and remained undeveloped until the mid-1960s, when the Site was cleared and graded. Site Building 2 and Building 3 were constructed in the northern portion of the Site, and the remaining portions of the Site were paved from the early to mid-1970s. Site Building 1 was constructed in the northwestern portion of the Site in the early 1980s, and Building 4 was constructed in the central portion of the Site in the mid to late 1990s. The Site has been used for automotive sales and service operations by multiple tenants for more than 40 years. 1.2 Previous Assessment Activities As part of initial property transaction due diligence activities, H&H completed a Phase I ESA at the Site in March 2021 and identified environmental concerns associated with historical on-Site and nearby off-Site operations. To address environmental concerns and the potential for persistent impacts associated with historical on-Site operations, a Brownfields Property Application was Mr. Bill Schmithorst, PG November 22, 2022 Page 3 https://harthick.sharepoint.com/sites/masterfiles-1/shared documents/aaa-master projects/ardent - aco/aco.002 - 6500 south boulevard/soil removal work plan/25046 - soil excavation work plan - harrelson ford.docx submitted to the DEQ Brownfields Program on June 10, 2021. The Site received eligibility into the Brownfields Program in a letter dated October 29, 2021. 2021 Phase II ESA In August 2021, H&H performed Phase II ESA activities at the Site which included the collection of soil, groundwater, and soil gas samples for laboratory analysis. Because the Site was entered into the DEQ Brownfields Program, the Phase II ESA sampling approach was designed to be consistent with assessment activities typically requested by the DEQ Brownfields Program. Results of the soil assessment activities completed in the vicinity of former in-ground hydraulic lifts identified total petroleum hydrocarbons as diesel range organics (TPH-DRO) concentrations above the DEQ Underground Storage Tank (UST) Section Action Level at six of the twenty-four lift systems. Hexavalent chromium was detected at concentrations above the DEQ Residential Preliminary Soil Remediation Goals (PSRGs) and background levels in samples collected near the former in-ground hydraulic lifts, trench drains associated with the oil/water separator (OWS) system, and former wash bay floor drain. No other compounds were detected at concentrations above the DEQ screening criteria in soil samples collected at the Site. Results of soil gas assessment activities identified several compounds at concentrations above the DEQ Division of Waste Management (DWM) Vapor Intrusion Residential and/or Non-Residential Sub-slab and Exterior Soil Gas Screening Levels (SGSLs). The compound ethylbenzene was detected in sample SG-7, installed adjacent to Building 3 (Figure 3), at a concentration above the DWM Non-Residential Vapor Intrusion SGSL of 490 micrograms per cubic meter (µg/m3). Laboratory analytical results for sample SG-7 also detected concentrations of 1,2,4- trimethylbenzene, 1,3,5-trimethybenzene, m&p-xylene, o-xylene, n-heptane, n-hexane, and PCE exceeding the DWM Residential Vapor Intrusion SGSLs. Risk calculator results using the highest compound concentrations detected in the soil gas samples indicate that the worst-case calculated cumulative lifetime incremental carcinogenic risk (LICR) and hazard index (HI) values exceed the DEQ and Environmental Protection Agency (EPA) acceptable thresholds of 1 x 10-4 and 1.0, respectively. Mr. Bill Schmithorst, PG November 22, 2022 Page 4 https://harthick.sharepoint.com/sites/masterfiles-1/shared documents/aaa-master projects/ardent - aco/aco.002 - 6500 south boulevard/soil removal work plan/25046 - soil excavation work plan - harrelson ford.docx February 2022 Brownfields Assessment Activities Based on results of previous Phase II ESA sampling and compound concentrations identified in near slab soil gas sample SG-7, DEQ Brownfields requested collection of sub-slab and exterior soil gas samples to further evaluate the potential for structural vapor intrusion in an email dated January 24, 2022. A Brownfields Assessment Work Plan for the requested additional assessment received DEQ Brownfields Program approval in an email dated February 11, 2022. In February 2022, H&H performed Brownfields assessment activities at the Site in accordance with the DEQ Brownfields Program approved Brownfields Assessment Work Plan. Assessment activities included the installation and sample collection from sub-slab soil gas monitoring points within Building 2, Building 3, and Building 4, and one exterior soil gas monitoring point installed northeast of the previous soil gas sample SG-7 to confirm impacts were limited to the vicinity of Building 3. In addition, one soil sample (SB-9) was collected for laboratory analysis from the previous soil gas sample SG-7 location to confirm impacts that may be present beneath Building 3 did not extend beyond the envelope of the building. Results of sub-slab soil gas assessment activities identified several compounds at concentrations above the DEQ DWM Residential and/or Non-Residential Vapor Intrusion SGSLs. Sub-slab soil gas sample laboratory analytical results identified the presence of PCE at a concentration above the DEQ DWM Residential Vapor Intrusion SGSL of 280 μg/m3 in soil gas samples collected in Building 2 (523 μg/m3), Building 3 (range from 1,090 μg/m3 to 6,670 μg/m3), and Building 4 (647 μg/m3). In addition to PCE, results of sub-slab soil gas samples collected within Building 4 indicate that trichloroethene or TCE (26.9 μg/m3) and vinyl chloride (11,700 μg/m3) were detected at concentrations above the DEQ DWM Vapor Intrusion Residential and/or Non-Residential SGSLs. The compounds benzene, 1,3-butadiene, chloroform, ethylbenzene, and naphthalene were also detected at concentrations above the DEQ DWM Residential Vapor Intrusion SGSLs in sub-slab soil gas samples collected at the Site. Mr. Bill Schmithorst, PG November 22, 2022 Page 5 https://harthick.sharepoint.com/sites/masterfiles-1/shared documents/aaa-master projects/ardent - aco/aco.002 - 6500 south boulevard/soil removal work plan/25046 - soil excavation work plan - harrelson ford.docx Results of previous Phase II ESA and Brownfields assessment activities completed at the Site indicate that a release of chlorinated solvents within the auto repair areas of Building 3 and Building 4 has resulted in soil impacts that appear to be limited to soil beneath the slabs of the two Site buildings. The data set for previous samples collected at the Site did not indicate obvious evidence of Sitewide impacts that pose unacceptable risks associated with the proposed redevelopment of the Site. A brief summary of the soil source assessment activities is provided in the following section. 2022 Additional Brownfields Assessment Activities Based on results of the previously completed Phase II ESA sampling activities and the DEQ- approved Brownfields assessment activities completed in February 2022, the DEQ Brownfields Program requested additional soil, groundwater, and sub-slab soil gas sampling to further evaluate potential risks associated with the potential presence of chlorinated solvents beneath Building 3 and Building 4 and to develop a conceptual Site model for environmental impacts identified at the Site. H&H prepared an Additional Brownfields Assessment Work Plan which included a preliminary conceptual Site model based on data collected at the Site and to conduct additional assessment activities to address DEQ Brownfields requests. The Work Plan received DEQ approval in an email dated May 16, 2022. Additional Brownfield assessment activities included completion of gridded sub-slab soil gas field screening surveys within Site Building 3 and Building 4 to identify “hot spot” areas in soil beneath the building slabs. After field screening activities were complete, sub-slab soil gas and soil samples were collected for laboratory analysis in hot spot areas to confirm results of the field screening survey. In addition, one temporary groundwater monitoring well (TMW-6) was installed and sampled adjacent to the downgradient side of Building 3 in the area of soil gas sample SG-7. Results of the sub-slab soil gas field screening survey activities completed within the Site buildings identified the presence of chlorinated compounds PCE (up to 1,211.35 part per billion by volume [ppbv]) and TCE (up to 436.25 ppbv) at detectable levels in Building 3 and Building 4. Mr. Bill Schmithorst, PG November 22, 2022 Page 6 https://harthick.sharepoint.com/sites/masterfiles-1/shared documents/aaa-master projects/ardent - aco/aco.002 - 6500 south boulevard/soil removal work plan/25046 - soil excavation work plan - harrelson ford.docx Laboratory analytical results of the sub-slab soil gas samples collected within hot spot areas of the Site buildings identified PCE and TCE at concentrations above the DEQ DWM Vapor Intrusion Residential and Non-Residential SGSLs in samples collected in the former mechanic bays of Building 3 and downgradient of the trench drain system in Building 4. Results of soil assessment activities completed in hot spot areas of Building 3 identified PCE (up to 0.65 mg/kg) in shallow soils beneath the building slab at concentrations above the DEQ Protection of Groundwater PSRG, but below the DEQ Residential PSRG within the former mechanic bays. Results of soil assessment activities completed in hot spot areas of Building 4 identified PCE (up to 1.3 mg/kg) in shallow soils beneath the building slab at concentrations above the DEQ Protection of Groundwater PSRG, but below the DEQ Residential PSRG in samples collected near the trench drain system. The compound TCE (up to 0.031 mg/kg) was also detected at a concentration above the DEQ Protection of Groundwater and Residential PSRGs in one soil sample collected downgradient of the trench drain system in Building 4. No other organic compounds were detected in the soil samples at concentrations above the DEQ PSRGs. Results of groundwater assessment activities completed near the northeastern corner of Building 3 (TMW-6) identified a low level of PCE (up to 2.5 µg/L) at concentrations above the 2L Standard, but below the DEQ DWM Vapor Intrusion GWSLs. No other compounds including TCE were detected at concentrations above the 2L Standards or GWSLs in the groundwater sample collected near the northeastern corner of Building 3. Results of the recent field screening survey, sub-slab soil gas, soil, and groundwater sampling activities confirm the conceptual Site models for Building 3 and Building 4 and indicate that contributions of chlorinated compound concentrations detected in soil gas are attributable to soil impacts below the Site buildings most likely due to a release associated with historical auto repair operations. Results of assessment activities completed at the Site to date indicate that soil impacts are limited to within the footprints of the Site buildings and there is no indication of a significant contribution of chlorinated compounds in soil gas from a significant groundwater source. Mr. Bill Schmithorst, PG November 22, 2022 Page 7 https://harthick.sharepoint.com/sites/masterfiles-1/shared documents/aaa-master projects/ardent - aco/aco.002 - 6500 south boulevard/soil removal work plan/25046 - soil excavation work plan - harrelson ford.docx Removal of impacted soil from areas beneath the Site buildings would greatly reduce soil gas concentrations and the potential for structural vapor intrusion into the proposed buildings on the Brownfields property. Therefore, H&H proposes to complete soil excavation activities beneath the Site Building 3 and Building 4 to remove the most concerning chlorinated compound-impacted soil prior to redevelopment activities. Details of the proposed soil excavation activities are provided in the following sections. 2.0 Soil Excavation Activities Prior to soil removal activities, the building slabs and other building equipment or features necessary to facilitate slab removal (e.g., non-structural indoor walls, underground piping, floor drains, etc.) will be removed to the extent necessary to access impacted soils. The buildings are otherwise expected to be left in place with all exterior walls and roofing intact and in functional condition. Concrete slabs and building materials removed from the Site buildings will be disposed of at a construction and demolition debris landfill. Concrete exhibiting signs of visible staining will be sampled prior to disposal in accordance with disposal facility sampling requirements. H&H will provide oversight of the excavation activities and collect soil samples for field screening using a calibrated photoionization detector (PID) and/or a hand-held gas chromatograph calibrated to measure PCE and TCE concentrations to assist in the removal of impacted soil. Once the concrete slabs have been removed, targeted excavation using a track hoe or similar excavator will initially be completed in the areas where PCE and TCE were previously detected in soil samples at concentrations above the DEQ PSRGs (soil samples SB-2, HL-10, HL-17, HL-20, HL-22, HL- 23, MP-18, MP-18A, MP-18B. MP-18C, and MP-18D within Building 3 and in soil samples SB- 6, SB-7, MP-43, MP-43B, and MP-43C within Building 4; see Figure 3). Soil samples will be collected and analyzed in the field using a mobile laboratory to determine the lateral and vertical extents of the excavation in each area. Soil will be excavated from each area until mobile lab results indicate PCE and TCE impacts have been adequately removed below the mobile laboratory method detection limits. Post-excavation confirmation samples will then be Mr. Bill Schmithorst, PG November 22, 2022 Page 8 https://harthick.sharepoint.com/sites/masterfiles-1/shared documents/aaa-master projects/ardent - aco/aco.002 - 6500 south boulevard/soil removal work plan/25046 - soil excavation work plan - harrelson ford.docx collected for laboratory analysis as described below. The estimated extents of proposed excavation limits in each area of concern in Building 3 and Building 4 are shown in Figure 3. For quality assurance and quality control (QA/QC) purposes, one duplicate soil sample of a mobile lab sample will be submitted for analysis of volatile organic compounds (VOCs) from each building. The duplicate samples will be collected from mobile lab samples exhibiting TCE concentrations above the DEQ Residential PSRG, if possible. If mobile lab TCE concentrations are below the DEQ Residential PSRG, then the sample with the highest detected concentrations will be submitted for laboratory analysis of VOCs by EPA Method 8260. Impacted soil identified beneath Building 3 and Building 4 will be excavated for off-Site disposal. Although the exact vertical and horizontal limits of the excavations will be determined in the field based on the results of the field screening and mobile laboratory analytical results, impacted soils beneath Building 3 and Building 4 are not expected to extend beyond the building envelope and depths of the excavations will be no greater than 10 feet below ground surface (bgs), which is the approximate depth to groundwater in the central portion of the Site. Soil will be direct loaded onto trucks for transport and disposal at the Republic Services solid waste landfill located in Concord, North Carolina (Republic). If the soil cannot be direct loaded, it will be stockpiled on a minimum of 10 mil plastic and secured with plastic until it can be loaded for transport and off-Site disposal at Republic. Soil excavation activities will be managed in accordance with the DEQ-approved Environmental Management Plan. 2.1 Confirmation Soil Sampling Activities Once the excavation is complete and results of field screening and mobile laboratory analytical results indicate that no obvious evidence of impact remains in-situ, H&H will collect post- excavation confirmation samples for laboratory analysis from the sidewalls and base of the excavations. Based on the depth to groundwater, excavation activities will not extend to depths greater than 10 ft bgs, and post-excavation soil samples will not be collected greater than 9 ft bgs. Mr. Bill Schmithorst, PG November 22, 2022 Page 9 https://harthick.sharepoint.com/sites/masterfiles-1/shared documents/aaa-master projects/ardent - aco/aco.002 - 6500 south boulevard/soil removal work plan/25046 - soil excavation work plan - harrelson ford.docx Soil sample aliquots collected from Building 3 and Building 4 will be collected from shallow (0- 3 ft bgs), middle (3-6 ft bgs), and deeper (6-9 ft bgs) depth intervals at locations every 10 linear feet of excavation sidewall and base extents. The shallow, middle, and deep aliquot samples will be field screened for the presence of volatile organic vapors using a calibrated PID and hand-held gas chromatograph. The soil sample exhibiting the highest likelihood for impacts based on field screening results will be collected for laboratory analysis. If field screening results do not indicate the potential for impact in sample aliquots collected from a sample location, then the middle depth (3-6 ft bgs) aliquot will be selected for laboratory analysis. Soil samples selected for laboratory analysis will be placed in dedicated laboratory-supplied sample containers, labeled with the sample identification, date, and requested analysis, and placed in a laboratory-supplied cooler with ice. The samples will be submitted to a North Carolina- certified laboratory under standard chain of custody protocols for laboratory analysis of VOCs by EPA Method 8260. For quality control and quality assurance purposes, one duplicate soil sample will be collected for every 20 soil samples collected and submitted for laboratory analysis for the same parameters as the parent soil sample. Based on the results of the confirmation sidewall and base soil samples, H&H will determine if over-excavation activities are warranted. In the event that confirmation sample analytical results indicate that PCE is present above the DEQ Protection of Groundwater PSRG and/or TCE is present above the laboratory method detection limit or such other concentration as is approved by DEQ in writing, additional excavation activities will be completed in isolated areas as determined by analytical results. After additional excavation activities are completed, another round of confirmation soil samples will be collected in the area of additional excavation in accordance with the methodologies described above. Once post-excavation laboratory analytical results indicate that PCE is not present above the DEQ Protection of Groundwater PSRG, and that TCE is not present above the laboratory method detection limit or such other concentration as is approved by DEQ in writing, the excavation will be backfilled with clean fill, including soil from other portions of the Site that is not impacted, prior to beginning grading activities in this portion of the Site. Mr. Bill Schmithorst, PG November 22, 2022 Page 10 https://harthick.sharepoint.com/sites/masterfiles-1/shared documents/aaa-master projects/ardent - aco/aco.002 - 6500 south boulevard/soil removal work plan/25046 - soil excavation work plan - harrelson ford.docx Alternatively, clean soil imported to the Site from a DEQ-approved facility will be used to backfill the excavations. 2.2 Reporting Following receipt of the confirmation soil sample laboratory analytical results indicating that no further excavation is required to remove impacted soil, H&H will prepare a Soil Excavation Report to document the excavation activities. The report will include a discussion of the rationale for potential deviations to the work plan (if warranted), a figure depicting the extent of the excavation and locations of confirmation soil sample locations, a tabular summary of the confirmation sample results, laboratory analytical data, soil export manifests, a discussion of the soil analytical results in comparison to regulatory screening levels, and conclusions concerning the soil excavation activities. Table Table 1Proposed Sample Summary TableHarrelson FordCharlotte, North Carolina H&H Project No. ACO-002EX-SS-1 through EX-SS-X*Excavation Sidewall(0-9 ft bgs)0-3, 3-6, and 6-9 TBD*VOCs (8260)EX-B-1 through EX-B-X*Excavation Base (9 ft bgs) 8-9 TBD* VOCs (8260)EX-SS-DUP QA/QCExcavation Sidewall(0-9 ft bgs)TBD TBD* VOCs (8260)ML-DUP-01 and ML-DUP-02 QA/QC for Mobile LabExcavation Sidewall(0-9 ft bgs)TBD TBD* VOCs (8260)Notes:The EPA method number follows the laboratory parameter in parenthesis in the table above. VOCs = Volatile Organic Compounds; ft = feet; QA/QC = Quality Assurance/ Quality Control; TBD = To Be Determined* = Final number of soil samples and duplicates will depend on the linear feet of excavation extents.Sample IDsApproximate Boring Depth (ft)Number of SamplesLaboratory AnalysisSample ObjectiveSample TypeApproximate Sample Depth (ft)SoilPost-Excavation Confirmation Samples- Building 3 and Building 4https://harthick.sharepoint.com/sites/MasterFiles‐1/Shared Documents/AAA‐Master Projects/Ardent ‐ ACO/ACO.002 ‐ 6500 South Boulevard/Soil Removal Work Plan/Sample Summary TableTable 1 (Page 1 of 1) Hart & Hickman, PC Figures USGS The National Map: National Boundaries Dataset, 3DEP ElevationProgram, Geographic Names Information System, National HydrographyDataset, National Land Cover Database, National Structures Dataset,and National Transportation Dataset; USGS Global Ecosystems; U.S.Census Bureau TIGER/Line data; USFS Road Data; Natural Earth Data;U.S. Department of State Humanitarian Information Unit; and NOAANational Centers for Environmental Information, U.S. Coastal ReliefModel. Data refreshed May, 2020. SITE LOCATION MAP HARRELSON FORD6500 SOUTH BOULEVARD CHARLOTTE, NORTH CAROLINA DATE: 9-14-22 JOB NO: ACO-002 REVISION NO: 0 FIGURE. 1 2923 South Tryon Street - Suite 100 Charlotte, North Carolina 28203 704-586-0007 (p) 704-586-0373 (f) License # C-1269 / # C-245 Geology TITLE PROJECT 0 2,000 4,000 SCALE IN FEET Path: S:\AAA-Master Projects\Ardent - ACO\ACO.002 - 6500 South Boulevard\Figures\Figure-1.mxdN U.S.G.S. QUADRANGLE MAP CHARLOTTE EAST, NORTH CAROLINA 2013CHARLOTTE WEST, NORTH CAROLINA 2013 QUADRANGLE 7.5 MINUTE SERIES (TOPOGRAPHIC) SITE REVISION NO. 0 JOB NO. ACO-002 DATE: 9-14-22 FIGURE NO. 2 HARRELSON FORD6500 SOUTH BOULEVARD CHARLOTTE, NORTH CAROLINA SITE MAP LEGEND BROWNFIELDS PROPERTY BOUNDARY PARCEL BOUNDARY RAILROAD TRENCH DRAIN RECTANGULAR FLOOR DRAIN CIRCULAR FLOOR DRAIN WASTE OIL AST NEW OIL AST FORMER UST CONCRETE SECONDARY CONTAINMENT VENT PIPE OUT-OF-USE IN-GROUND HYDRAULIC LIFT OIL/WATER SEPARATOR 2923 South Tryon Street-Suite 100Charlotte, North Carolina 28203704-586-0007(p) 704-586-0373(f)License # C-1269 / #C-245 Geology PARKING NOTES: 1. PARCEL DATA OBTAINED FROM MECKLENBURG COUNTYGIS, 2021. 2. AERIAL IMAGERY OBTAINED FROM MECKLENBURGCOUNTY GIS, 2021.OLD PINEVILLE ROADSOUTH BOULEVARDVICTORY CHRISTIAN CAMPUS(7000 OLD PINEVILLE ROAD) BANNER(6424 SOUTH BOULEVARD) ADAMS CAR SALES AND SERVICE(6501 & 6511 SOUTH BOULEVARD) FISHY FISH MARKET(6531 SOUTH BOULEVARD) AMERICAN AUTO SALES(6535 SOUTH BOULEVARD) LIFT AUTO AND SALES(6543 SOUTH BOULEVARD) SOUTH BOULEVARD CAR WASH CENTER(6547 SOUTH BOULEVARD) GOODWILL(6607 SOUTH BOULEVARD) LA PREFERIDA(6625 SOUTH BOULEVARD)PAVED PARKING(NO ASSIGNED ADDRESS) BUILDING #1 -VACANT WAREHOUSE BUILDING #2 -MULTI-TENANTAUTO REPAIR OFFICES/ STORAGE OFFICES BUILDING #4 - MAINTENANCE BAYSWITH ABOVEGROUNDHYDRAULIC LIFTS BUILDING #3 - MAINTENANCE BAYS WITH OUT-OF-USE IN-GROUND HYDRAULIC LIFTS S:\AAA-Master Projects\Ardent - ACO\ACO.002 - 6500 South Boulevard\Brownfields\Assessment\Work Plan\Figures\Figures 20220201.dwg, FIG 2, 2/2/2022 12:22:03 PM, sperry REVISION NO. 0 JOB NO. ACO-002 DATE: 10-27-22 FIGURE NO. 3 HARRELSON FORD6500 SOUTH BOULEVARD CHARLOTTE, NORTH CAROLINA SOIL SAMPLE LOCATION AND IMPACTS MAP 2923 South Tryon Street-Suite 100Charlotte, North Carolina 28203704-586-0007(p) 704-586-0373(f)License # C-1269 / #C-245 Geology BUILDING #4 BUILDING #3 OFFICE/STORAGE OFFICE OIL/WATER SEPARATOR HL-18 HL-17 HL-16 HL-15 HL-14 HL-13 HL-12 HL-7HL-4 HL-3 HL-6 HL-5 HL-19 HL-20 HL-21 HL-22 HL-23 HL-11 HL-10 HL-9 HL-8 HL-2 SG-7 SG-2 SB-2 SB-4 SB-5 SB-3 TMW-4/SB-1 SG-3 SG-8 SSV-6 SSV-5 SB-6 SB-7 TMW-3/SB-8 SSV-3 SSV-4SSV-2 SG-16 SB-9 SG-13 SG-12 TMW-5 MP-18 MP-3 MP-18A MP-18B MP-18C MP-18D MP-3A MP-3B MP-3C MP-3D MP-30A MP-30B MP-30C MP-30D MP-43A MP-43B MP-43C MP-43D MP-43B 0-1' PCE 1.3 TCE 0.031 VC ND cis-1,2-DCE ND SAMPLE ID SAMPLE DEPTH CONCENTRATION (mg/kg) CONSTITUENT MP-18 0-1'1-2' PCE 0.65 0.21 TCE ND ND VC ND ND cis-1,2-DCE ND ND MP-3 0-1' NO DETECTIONS MP-18C 0-1' PCE 0.022 TCE ND VC ND cis-1,2-DCE ND MP-18D 0-1' PCE 0.073 TCE ND VC ND cis-1,2-DCE ND MP-18A 0-1' PCE 0.53 TCE ND VC ND cis-1,2-DCE ND MP-18B 0-1' PCE 0.18 TCE ND VC ND cis-1,2-DCE ND MP-30 0-1' NO DETECTIONS MP-30B 0-1' NO DETECTIONSMP-30A 0-1' NO DETECTIONS MP-30C 0-1' NO DETECTIONS MP-30D 0-1' NO DETECTIONS MP-43 1-2'2-3' PCE 0.14 ND TCE 0.0071 ND VC ND ND cis-1,2-DCE 0.0033 J 0.0066 J MP-43B 0-1' PCE 1.3 TCE 0.031 VC ND cis-1,2-DCE ND MP-43A 1-2' NO DETECTIONS MP-43D 1-2' NO DETECTIONS MP-43C 1-2' PCE 0.73 TCE 0.020 VC ND cis-1,2-DCE ND MP-30 MP-43 NOTES: 1. AERIAL IMAGERY OBTAINED FROM MECKLENBURGCOUNTY GIS, 2021.2. CVOCs NOT DETECTED AT CONCENTRATIONS ABOVEMDLs IN GREY SAMPLES.3. CVOCs DETECTED AT CONCENTRATIONS BELOW DEQDWM VISLs IN GREEN HIGHLIGHTED SAMPLES.4. CVOCs DETECTED AT CONCENTRATIONS ABOVE DEQDWM VISLs IN BLUE HIGHLIGHTED SAMPLES.5. SOIL, GROUNDWATER, SUB-SLAB SOIL GAS, ANDEXTERIOR SOIL GAS SAMPLES COLLECTED BY H&H INAUGUST 2021, FEBRUARY 2022, AND MAY 2022.6. J FLAG DENOTES ESTIMATED CONCENTRATION BETWEENLABORATORY REPORTING LIMIT AND METHODDETECTION LIMIT.7. BOLD VALUE INDICATES COMPOUND EXCEEDS THEPROTECTION OF GROUNDWATER PSRG. ACRONYM KEY PCE TETRACHLOROETHYLENE TCE TRICHLOROETHYLENE VC VINYL CHLORIDE cis-1,2-DCE cis-1,2-DICHLOROETHYLENE ND NOT DETECTED CVOCs CHLORINATED VOLATILEORGANIC COMPOUNDS VISLs VAPOR INTRUSION SCREENINGLEVELS MDLs LABORATORY METHODDETECTION LIMITS PSRGs PRELIMINARY SOIL REMEDIATION GOALS HL-10 8-10' PCE 0.14 TCE 0.012 VC ND cis-1,2-DCE ND HL-17 8-10' PCE 0.014 TCE ND VC ND cis-1,2-DCE 0.0077 HL-18 8-10' PCE ND TCE ND VC ND cis-1,2-DCE 0.046 HL-20 8-10' PCE 0.93 TCE 0.041 VC ND cis-1,2-DCE ND HL-22 8-10' PCE 0.018 TCE ND VC ND cis-1,2-DCE 0.0081 HL-23 8-10' PCE 0.085 TCE ND VC ND cis-1,2-DCE ND SB-2 2-4' PCE 0.018 TCE 0.0075 VC ND cis-1,2-DCE ND SB-6 2-4' PCE 0.11 TCE 0.012 VC ND cis-1,2-DCE 0.014 SB-7 2-4' PCE 0.47 TCE 0.0058 VC ND cis-1,2-DCE ND LEGEND APPROXIMATE EXTENT OF FLOOR DRAIN SUB-SLAB SOIL GAS SAMPLE LOCATION SUB-SLAB SOIL GAS SURVEY SAMPLELOCATION CO-LOCATED SUB-SLAB SOIL GAS SURVEYSAMPLE AND SOIL SAMPLE LOCATION EXTERIOR SOIL GAS SAMPLE LOCATION SOIL BORING LOCATION CO-LOCATED SOIL BORING ANDTEMPORARY MONITORING WELL LOCATION PREVIOUS TEMPORARY MONITORING WELLLOCATION TEMPORARY MONITORING WELL LOCATION ESTIMATED EXTENTS OF INITIAL PROPOSEDEXCAVATION LIMITS TMW-6 MP-1 MP-2 MP-5 MP-6 MP-9 MP-10 MP-13 MP-14 MP-17 MP-21 MP-22 MP-25 MP-26 MP-27 MP-28 MP-23 MP-24 MP-19 MP-20 MP-15 MP-16 MP-11 MP-12 MP-7 MP-8MP-4 MP-29 MP-31 MP-32 MP-33 MP-34 MP-35 MP-36 MP-37 MP-38 MP-39 MP-40 MP-44 MP-42 MP-41 MP-45 MP-46 MP-47 MP-48 S:\AAA-Master Projects\Ardent - ACO\ACO.002 - 6500 South Boulevard\Brownfields\Additional Assessment\Figures\Figures 20220614.dwg, FIG 3(2), 10/27/2022 12:11:08 PM, shaynes