24051 Brownfields Assessment Work Plan - Dilworth Auto Service 20210511

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The Site was developed with single-family residences and ancillary structures as of at least 1905.
Commercial development began at the Site in the 1920s and continued until the late 1990s.
Historical commercial facilities on the Site have included a lumber warehouse, gas stations,
automotive repair shops, and dry cleaners.

The Site received a letter of eligibility for entry into the North Carolina Department of
Environmental Quality (DEQ) Brownfields Program (Brownfields Project No. 24051-20-060) on
October 30, 2020. The Prospective Developer (PD) plans to demolish the existing buildings and
redevelop the Site with commercial and multi-family residential buildings.

H&H performed soil, groundwater, and exterior soil gas sampling and methane screening activities
at the Site in November 2020 to evaluate potential areas of environmental concern associated with
historical on-Site operations. The assessment sample locations are depicted on Figure 2. A
summary of the results of the assessment is provided below.

Soil
• Laboratory analytical results indicated the presence of several volatile organic compounds
(VOCs) in soil that exceeded DEQ Preliminary Soil Remediation Goals (PSRGs) in the
vicinity of the former gas stations in the northeastern portion of the Site. Specifically,
ethylbenzene and naphthalene concentrations exceeded the Residential PSRGs in SB-1 (8-
10); a naphthalene concentration exceeded the Commercial/Industrial PSRG in SB-1 (8-10);
benzene concentrations exceeded the Protection of Groundwater PSRG in SB-1 (8-10) and
SB-2 (8-10); and a xylenes concentration exceeded the Protection of Groundwater PSRG in
SB-1 (8-10).
• The concentration of tetrachloroethylene (PCE) slightly exceeded the Protection of
Groundwater PSRG in SB-10 (1-3), located in the northeastern portion of the Site.
• The polycyclic aromatic hydrocarbon (PAH) 2-methylnaphthalene in SB-1 (8-10) was
detected at a concentration above the Protection of Groundwater PSRG.
• Lead was detected at a concentration above the Residential PSRG in soil sample SB-6 (1-3),
located near a former automotive repair shop in the northeastern portion of the Site.
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• Hexavalent chromium was detected at concentrations above the Residential PSRG in
multiple soil samples. However, based on the relatively low-level detections of hexavalent
chromium, the even distribution of hexavalent chromium detections across the Site, and the
lack of obvious on-Site sources of hexavalent chromium based on historical operations, the
detected hexavalent chromium concentrations are likely naturally occurring.
• Arsenic was detected in several soil samples collected at the Site at concentrations above the
Residential and Industrial/Commercial PSRGs, and selenium was detected in several soil
samples collected at the Site at concentrations which exceeded the Protection of
Groundwater PSRG. The detected arsenic and selenium concentrations appear to be
naturally occurring based on published background data, the lack of obvious sources of
selenium based on historical operations at the Site, and prior soil data for the South End
District of Charlotte.
• The results of risk calculations using combined Site soil data indicate that the calculated
cumulative risks are below acceptable risk levels for the residential, non-residential worker,
and construction worker exposure scenarios.

Groundwater
• Laboratory analytical data indicate that the VOCs benzene, 1,2-dichlorothane, ethylbenzene,
isopropylbenzene, 2-hexanone, methyl isobutyl ketone, methyl tert-butyl ether, naphthalene,
toluene, and xylenes were detected above the respective North Carolina 2L Groundwater
Standards (2L Standards)/Interim Maximum Allowable Concentrations (IMACs) in samples
TMW-1/TMW-Dup. Benzene was also detected in groundwater samples TMW-2 and
TMW-7 above the 2L Standard. Groundwater samples TMW-1/TMW-Dup and TMW-2
were collected near former gas stations and an automotive repair shop in the northeastern
portion of the Site, and sample TMW-7 was collected in the southern portion of the Site near
a former on-Site gas station and downgradient of an off-Site gas station.
• PCE was detected at a concentration slightly above the 2L Standard in groundwater sample
TMW-5, which was collected in the northwestern portion of the Site and downgradient of the
former dry cleaner at 113/115 East Boulevard.
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• Results of semi-VOC (SVOC) analysis indicate the presence of 2-methylnaphthalene and
naphthalene at concentrations above the 2L Standards in samples TMW-1/TMW-Dup.
• No metals were detected in the seven temporary well samples at concentrations above the 2L
Standards.

Vapor Intrusion (VOCs)
• Hexane was detected in soil gas sample SG-Dup-11/20/20 (SG-3 location) and chloroform
was detected in soil gas sample SG-4 at concentrations slightly above the DEQ Division of
Waste Management (DWM) Residential Soil Gas Screening Levels (SGSLs) but below the
Non-Residential SGSLs.
• Cumulative risk calculations for each of the proposed enclosed building areas show that the
non-carcinogenic and carcinogenic risk levels are below acceptable risk levels for both
residential and non-residential exposure scenarios.

Methane Assessment
• Results of methane gas screening activities conducted at each of the 11 soil gas sample
locations indicated that methane is present at trace levels in SG-3. Methane concentrations
measured in SG-3 (0.6% to 0.8% by volume) are not within the explosive limits, and
differential pressure measurements collected from SG-3 indicate that the localized, trace
levels of methane gas are stable. Therefore, methane vapor intrusion into the proposed Site
buildings does not appear to be a significant concern, and no additional evaluation of
methane is warranted.

Results of the November 2020 assessment activities were provided to the DEQ Brownfields
Program in a Brownfields Assessment Report dated February 1, 2021. In an email dated April 16,
2021, the DEQ Brownfields Program requested additional Site assessment. This work plan has been
prepared to address DEQ Brownfields request for additional assessment activities. The proposed
assessment activities are summarized in the following sections.

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2.0 Brownfields Assessment Activities

Brownfields assessment activities will consist of completion of a receptor survey, and collection of
soil and soil gas samples for laboratory analysis to further evaluate the potential for impacts and to
assist in management of Site media during future redevelopment activities. The proposed sample
locations are shown in Figure 2, and a tabular summary of the proposed samples, sample objectives,
and laboratory analyses is provided as Table 1.

The proposed assessment activities will be performed in general accordance with DEQ’s Inactive
Hazardous Sites Branch (IHSB) Guidelines for Assessment and Cleanup of Contaminated Sites
(Guidelines) dated January 2020, the DEQ DWM Vapor Intrusion Guidance (VI Guidance) dated
March 2018, and most recent versions of the U.S. Environmental Protection Agency (EPA) Region
IV Science and Ecosystem Support (SESD) Field Branches Quality System and Technical
Procedures guidance.

Prior to conducting the field activities, H&H will contact North Carolina 811, the public utility
locator, to mark subsurface utilities located on the Site. H&H will also contract with a private utility
locator to screen the proposed boring locations for subgrade utilities which may not be identified by
the public locator. Additionally, each boring location will be hand cleared to approximately 5 ft
below ground surface (bgs) to further screen the boring locations for the presence of subsurface
utilities.

2.1 Receptor Survey

H&H will perform a Brownfields receptor survey in accordance with DEQ Brownfields Program
guidance. The receptor survey will include information about land use in the Site area including
zoning. H&H will also conduct a field search for water supply wells, basements, utility manways
and chases, storm sewers, other underground utilities, drains, and surface water within a 1,500 ft
radius of the Brownfields property boundaries. In addition, H&H will review the online
Mecklenburg County Well Information System for potential wells in the area and, if warranted,
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contact utility companies for information concerning underground utilities in the immediate area of
the Site. The receptor survey will be completed using the most current version of the Brownfields
Property Receptor Survey template form.

2.2 Soil Assessment Activities

Former Auto Repair Shops
H&H proposes to collect two soil samples in the vicinity of former auto repair shops at the Site
which may have historically used hydraulic lifts. One soil sample (SB-14A) will be collected in the
vicinity of previous soil boring SB-14 located near a former auto repair shop in the center of the
Site, and one soil sample (SB-18) will be collected between previous soil borings SB-5 and SB-6
located near a former auto repair shop in the northeastern portion of the Site. The proposed soil
sample locations are depicted on Figure 2.

Soil borings will be advanced to approximately 10 ft bgs at each proposed location utilizing a
decontaminated stainless-steel hand auger and track-mounted direct-push technology (DPT) drill rig.
During boring advancement, continuous soil samples will be collected from each boring using
decontaminated hand auger buckets and acetate-lined macrocore sleeves. The soil samples will be
logged for lithologic description, inspected for the presence of visual and olfactory indication of
potential impacts, and screened for the presence of volatile organic vapors with a calibrated
photoionization detector (PID). One soil sample will be collected from each boring location at a
depth of approximately 5 to 7 ft bgs for laboratory analysis unless field screening indicates potential
impacts from hydraulic oil at a different depth interval.
Following collection, the soil samples 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 delivered to a North Carolina-certified
laboratory under standard chain-of-custody protocols. The soil samples will be analyzed for
polychlorinated biphenyls (PCBs) by EPA Method 8082. In addition, samples SB-14A and SB-18
may also be analyzed for PCB congeners by EPA Method 1668 if PCBs are detected in one or more
soil samples using EPA Method 8082.
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Former Underground Storage Tank Basin
H&H proposes to collect one soil sample (SB-19) in the vicinity of a former underground storage
tank (UST) basin in the southern corner of the Site. The proposed soil sample location is depicted
on Figure 2.

The soil boring will be advanced to approximately 15 ft bgs (or a depth interpreted to be below the
former UST basin) utilizing a decontaminated stainless-steel hand auger and track-mounted DPT
drill rig. During boring advancement, continuous soil samples will be collected from the boring
using decontaminated hand auger buckets and acetate-lined macrocore sleeves. The soil samples
will be logged for lithologic description, inspected for the presence of visual and olfactory indication
of potential impacts, and screened for the presence of volatile organic vapors with a calibrated PID.
A soil sample will be collected for laboratory analysis from the depth interval within the boring
indicating the highest potential for impacts based on field observations.

Following collection, the soil sample 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 sample will be delivered to a North Carolina-certified
laboratory under standard chain-of-custody protocols. The soil sample will be analyzed for VOCs
by EPA Method 8260, SVOCs by EPA Method 8270, Resource Conservation Recovery Act
(RCRA) metals by EPA Methods 6020/7471, and hexavalent chromium by EPA Method 7199.

Following sampling, the soil borings will be properly abandoned using hydrated bentonite, and the
ground surface will be restored to match approximate pre-drilling conditions. Additionally, the soil
sample locations will be estimated using a hand-held global positioning system (GPS) unit.
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2.3 Exterior Soil Gas Sampling

To further evaluate the potential for vapor intrusion into the proposed enclosed buildings at the Site,
H&H proposes to install three temporary soil gas monitoring points (SG-12 through SG-14) in the
area of the former gas stations in the northeastern portion of the Site. The proposed exterior soil gas
sampling locations are shown on Figure 2.

The exterior soil gas monitoring points will be installed utilizing a decontaminated stainless-steel
hand auger and track-mounted DPT drill rig to a depth of approximately 7 ft bgs. During boring
advancement, continuous soil samples will be collected from each boring from the center of the hand
auger bucket or acetate-lined macrocore sleeve. The soil samples will be logged for lithologic
description, inspected for the presence of visual and olfactory indication of potential impacts, and
screened for the presence of volatile organic vapors with a calibrated PID.

After advancing the boring to depth, a 6-inch stainless-steel screen point fitted with ¼-inch diameter
Teflon® tubing will be installed within each borehole. Filter sand will be placed from the base of
the boring to approximately six inches above the screened interval. The sampling points will be
completed by placing hydrated bentonite from the top of the filter sand to the ground surface.

A laboratory-supplied batch certified 1-liter or 3-liter stainless steel Summa sample canister will be
connected to an in-line flow controller with a vacuum gauge and the flow controller will be
connected to the soil gas point sample tubing using a brass nut and ferrule assembly to form an air-
tight seal. The flow regulator will be pre-set by the laboratory to regulate the vapor intake rate to
approximately 100 milliliters per minute.

Prior to sampling, a leak check will be conducted at each soil gas monitoring point by constructing a
shroud around the sampling point including the completed sample train, flooding the air within the
shroud with helium gas, and using a calibrated helium gas detector to measure helium concentrations
within the shroud. Helium concentrations inside the shroud will be maintained at concentrations of
approximately 20% to 40% for the duration of the leak check. Using a syringe and three-way valve,
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the sample screen, sand filter pack, and sample tubing will be purged of approximately three
volumes. Vapor from the monitoring point sample tubing will be purged and sampled outside of the
shroud into a Tedlar® bag and analyzed using the helium gas detector to ensure that helium
concentrations are less than 10% of the concentration measured within the shroud.

Following a successful leak check, the intake valve on the Summa canister will be fully opened to
begin collection of the soil gas sample. Vacuum readings on the Summa canisters will be recorded
prior to and following the sampling period to ensure adequate sample volume was collected. A
vacuum will be maintained within the canisters at the conclusion of the sampling event.

After sample collection, the intake valve will be closed, and the regulator will be disconnected from
the canister. The starting and ending vacuum in each canister will be recorded on the chain-of-
custody and submitted to the laboratory along with the samples. The canisters will be placed in
laboratory-supplied shipping containers, properly labeled and shipped under standard chain-of-
custody protocols to a nationally accredited laboratory for analysis of VOCs by EPA Method TO-15.

Following sampling activities, the exterior soil gas sampling points will be properly abandoned and
the surfaces will be restored to approximately match pre-drilling conditions. Additionally, the
exterior soil gas sample locations will be estimated using a GPS unit.

2.4 Quality Assurance/Quality Control Samples

The following samples will be collected for quality assurance/quality control (QA/QC) purposes:

• One duplicate soil sample will be collected from sample SB-19 and analyzed for the same
parameters as the parent sample (i.e., VOCs by EPA Method 8260, SVOCs by EPA Method
8270, RCRA metals by EPA Method 6020/7471, and hexavalent chromium by EPA Method
7199).
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• One duplicate soil sample will be collected from sample SB-14A or SB-18 and analyzed for
PCBs by EPA Method 8082. The duplicate sample may also be analyzed for PCB congeners
by EPA Method 1668 if PCBs are detected in one or more soil samples using EPA Method
8082.
• One duplicate exterior soil gas sample will be collected using a laboratory-supplied T-fitting
which will allow for the collection of two soil gas samples from the same location
simultaneously. The duplicate exterior soil gas sample will be analyzed for VOCs by EPA
Method TO-15.

Non-dedicated equipment and tools will be decontaminated prior to use at each boring or sampling
location, or following exposure to Site soil.

Laboratory QA/QC procedures will be employed to ensure appropriate sample handling and analysis
and to aid in the review and validation of the analytical data. QA/QC procedures will be conducted
in accordance with the method protocols and will include regular equipment maintenance,
equipment calibrations, and adherence to specific sample custody and data management procedures.
Samples will be analyzed in conjunction with appropriate blanks, laboratory duplicates, continuing
calibration standards, surrogate standards, and matrix spiking standards in accordance with approved
methodologies to monitor both instrument and analyst performance. Laboratory reporting limits for
each analyte will be at or below appropriate screening criteria, where possible. Additionally, H&H
will request that the laboratory include estimated concentrations for compounds that are detected at
levels above the laboratory method detection limit, but below the laboratory reporting limit (J Flags).

A copy of the laboratory analytical data report and QA package for each group of samples submitted
to and analyzed by the subcontracted laboratory will be provided in an appendix to the final report.
Laboratory QA data consistent with Level II documentation will be requested for this project. A
copy of the completed chain-of-custody record and shipping receipt will be appended to the
corresponding laboratory analytical report included with the final report.
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2.5 Investigation Derived Waste
Based on prior Site data, investigation derived waste (IDW) generated during the assessment
activities will be thin spread on-Site in accordance with North Carolina regulation
15A NCAC 02T.1503. However, if significant impacts are suspected, the soil cuttings will be
containerized in 55-gallon drums and staged on-Site pending analytical results of a composite IDW
sample. Based on laboratory analytical results of IDW samples, the drums will be transported off-
Site to a permitted facility for disposal, if needed.

2.6 Reporting
Following completion of the assessment activities and receipt of the analytical data, H&H will
document our findings in a Brownfields Assessment Report. The report will include the receptor
survey results, a description of the sampling activities, a figure depicting sample locations, soil
boring and soil gas point construction logs, data tables, a discussion of the data in comparison to
regulatory screening levels, laboratory analytical reports, and conclusions and recommendations
concerning our activities. For the soil gas results, H&H will use the NC DEQ Soil Gas to Indoor Air
risk calculator to evaluate cumulative health risks based on the data.

We look forward to your approval of this work plan. Should you have any questions or need
additional information please do not hesitate to call us at [phone].

Sincerely,
Hart & Hickman, PC
Bo Cappleman, PG Christine E. Schaefer Due Diligence Manager Senior Project Scientist
cc: Mr. Jay Levell and Mr. Justin Trowbridge, White Point Partners, LLC (via email) Mr. Chris Walker, Alexander Ricks, PLLC (via email) Attachments
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
DILWORTH AUTO SERIVCE
120 EAST KINGSTON AVE, 1700-1728 SOUTH BOULEVARD, AND 101-115 EAST BOULEVARD
CHARLOTTE, NORTH CAROLINA
DATE: 12-10-20
JOB NO: WPP-011
REVISION NO: 0
FIGURE. 1
2923 South Tryon Street - Suite 100Charlotte, North Carolina 28203704-586-0007 (p) 704-586-0373 (f)License # C-1269 / # C-245 Geology
TITLE
PROJECT
0 2,000 4,000
SCALE IN FEET
Path: \\HHFS01\Redirectedfolders\sperry\My Documents\ArcGIS\PROJECTS\WPP-011\Figure 1.mxdN
U.S.G.S. QUADRANGLE MAP
CHARLOTTE EAST, NORTH CAROLINA 2013
QUADRANGLE
7.5 MINUTE SERIES (TOPOGRAPHIC)
SITE
SG-7
SG-8
SG-1
SG-2
SG-4
SG-5
SG-6
SG-9SG-11
SG-10
SG-3
SB-2
SB-1/TMW-1
SB-3SB-6/TMW-2SB-9
SB-14/TMW-4
SB-12
SB-13
TMW-7
SB-11
SB-5
SB-4
SB-7/TMW-3
SB-8
SB-10
SB-15/TMW-5
SB-16/TMW-6
SB-17
REVISION NO. 0
JOB NO. WPP-011
DATE: 5-10-21
FIGURE NO. 2
DILWORTH AUTO SERVICE120 EAST KINGSTON AVE., 1700-1728 SOUTH
BOULEVARD, AND 101-115 EAST BOULEVARD
CHARLOTTE, NORTH CAROLINA
PROPOSED SAMPLE LOCATION MAP
2923 South Tryon Street-Suite 100
Charlotte, North Carolina 28203
704-586-0007(p) 704-586-0373(f)
License # C-1269 / #C-245 Geology
E
A
S
T

K
I
N
G
S
TO
N

A
V
E
N
U
E
WALGREENS
(1728 SOUTH BOULEVARD)
ESSEXRICHARDS
(1701 SOUTH BOULEVARD)
NOTES:
1. PARCEL BOUNDARY DATA AND AERIAL IMAGERY
OBTAINED FROM MECKLENBURG COUNTY GIS, 2020.
2. FORMER TANK BASIN AND DISPENSER ISLAND
LOCATIONS AT 1700 SOUTH BOULEVARD OBTAINED
FROM BUXTON ENVIRONMENTAL, INC. FIGURE 2 SITE
LAYOUT MAP.
3. FORMER UST LOCATIONS AT 1728 SOUTH BOULEVARD
OBTAINED FROM MOUNTAIN ENVIRONMENTAL
SERVICES, INC. CLOSURE REPORT DATED MAY 3, 1999
AND GEO-ENVIRONMENTAL CONSULTANTS, INC. UST
CLOSURE REPORT DATED AUGUST 19, 1999.
4. UST = UNDERGROUND STORAGE TANK
FORMER
TANK BASIN
FORMER
DISPENSER
ISLANDS
FORMER GAS STATION
BUILDING
(1951 & 1953
SANBORN MAPS)
FORMER TIRE SHOP
(1940s & 1950s)
GASOLINE USTs
(1951 & 1953
SANBORN MAPS)
E
A
S
T

B
O
U
L
E
V
A
R
D SOUTH B
O
ULEVA
RDCAMDEN ROADROSEMONT
(1714 SOUTH BOULEVARD)
FORMER DRY CLEANER
(113/115 EAST BOULEVARD)
PARKING
AREA
VACANT LAND
(FORMERLY 1700 SOUTH BOULEVARD)
VACANT COMMERCIAL
BUILDING
(1708 SOUTH
BOULEVARD)
VACANT COMMERCIAL
BUILDING
(120 EAST KINGSTON AVENUE)
FORMER FILLING STATION
(1929 & 1953 SANBORN MAPS)
FORMER AUTO REPAIR SHOP
(1969 SANBORN MAP)
FORMER VEHICLE
SERVICE PIT
SG-12
SG-13
SB-18
SB-14A
LEGEND
BROWNFIELDS SITE PROPERTY BOUNDARY
PARCEL BOUNDARY LINE
RAILROAD
APPROXIMATE EXTENT OF BASEMENT
HEATING OIL UST
NEW/USED OIL UST
FORMER NEW/USED OIL UST
FORMER GASOLINE UST
FORMER HEATING OIL UST
SOIL SAMPLE LOCATION
GROUNDWATER SAMPLE LOCATION
SOIL AND GROUNDWATER SAMPLE
LOCATION
EXTERIOR SOIL GAS SAMPLE AND METHANE
SCREENING LOCATION
PROPOSED SOIL GAS SAMPLE LOCATION
PROPOSED SOIL SAMPLE LOCATION
SB-19
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Table 1Sample Summary TableDilworth Auto Service120 E. Kingston Avenue, 1700-1728 South Blvd., and 101-115 East Blvd. Charlotte, North Carolina H&H Project No. WPP-011SB-14A and SB-18Soil SampleCharacterize soil conditions in former auto repair shop areas2PCBs by EPA Method 8082SB-19Soil SampleCharacterize soil conditions in former UST basin1VOCs by EPA Method 8260, SVOCs by EPA Method 8270, RCRA Metals by EPA Methods 6020/7471, and hexavalent chromium by EPA Method 7199SG-12, SG-13, and SG-14Exterior Soil Gas SampleAssess potential vapor intrusion risk in area of proposed enclosed building3VOCs by EPA Method TO-15SOIL-DUP-1 and SOIL-DUP-2Soil Sample DuplicateQA/QC2SOIL-DUP-1: DuplicatVOCs by EPA Method 8260, SVOCs by EPA Method 8270, RCRA Metals by EPA Methods 6020/7471, and hexavalent chromium by EPA Method 7199SOIL-DUP-2: PCBs by EPA Method 8082SG-DUPSoil Gas Sample DuplicateQA/QC1VOCs by EPA Method TO-15Notes:VOCs = Volatile Organic Compounds; SVOCs = semi-VOCs; RCRA = Resource Conservation and Recovery Act; QA/QC = Quality Assurance/Quality Control;PCBs = Polychlorinated Biphenyls; UST = Underground Storage TankSample IDsNumber of SamplesLaboratory AnalysisSample ObjectiveSample TypeM:\AAA-Master Projects\White Point Partners (WPP)\WPP-011 Dilworth Auto Service Phase II ESA & Brownfields\Brownfields Assessment\Work Plan\Sample Summary Table.xlsxTable 1Hart & Hickman, PC