HomeMy WebLinkAbout25046 -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
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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
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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
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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
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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
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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
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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
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November 22, 2022
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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.
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November 22, 2022
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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.
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November 22, 2022
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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