25006_Maaco Fleet Solutions_BF Assessment Work Plan Approval Pkg_20210513

May 13, 2021 Sent Via E-mail

Eric Nichols FHN Holdings, LLC c/o Providence Group Capital 300 W. Summit Avenue, Suite 250 Charlotte, NC 28203
[e-mail]
Subject: Brownfields Assessment Work Plan Approval Maaco Fleet Solutions 2217 S. Tryon St. Charlotte, Mecklenburg County
Brownfields Project Number 25006-21-060 Dear Mr. Nichols: The North Carolina Department of Environmental Quality (DEQ) Brownfields Program received
and reviewed the Brownfields Assessment Work Plan for additional assessment activities submitted by Hart & Hickman for the above referenced project dated May 12, 2021. Based on our review, the Brownfields Work Plan is approved.
Be advised that this approval from the Brownfields Program does not waive any applicable
requirement to obtain any necessary permits, licenses, or certifications for the above referenced activities nor does it waive any requirement to comply with applicable law for such activities. If you have any questions, please feel free to contact me via e-mail at [e-mail].
Sincerely,
Peter L. Doorn Brownfields Project Manager ec: J.Q. Freeman, Providence Group Capital Matt Ingalls, Hart & Hickman
Tracy Wahl, DEQ

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M:\AAA-Master Projects\Providence Group (PRO)\PRO-014 2217 S Tryon Street (Maaco Service)\Brownfields\Work Plan\Brownfields Assessment
Work Plan - Maaco Fleet Solutions Brownfields Property (BF #25006-21-060).docx
Brownfields Assessment Work Plan
Maaco Fleet Solutions Brownfields Property
2217 S. Tryon Street
Charlotte, North Carolina
Brownfields Project ID: 25006-21-060
H&H Job No. PRO-014

Table of Contents

Section Page No.
1.0 Introduction ............................................................................................................................ 1 
2.0 Brownfields Assessment Scope of Work .............................................................................. 5 
2.1 Sub-Slab Vapor Assessment ................................................................................................. 5 
2.2 Quality Assurance/Quality Control ...................................................................................... 7 
2.3 Boring Abandonment and Investigation Derived Waste ...................................................... 7 
3.0 Reporting ................................................................................................................................ 8 

Table
Table 1 Proposed Sample Summary

List of Figures
Figure 1 Site Location Map
Figure 2 Proposed Sample Location Map

Appendices
Appendix A Previous Data Tables and Figures

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Brownfields Assessment Work Plan
Maaco Fleet Solutions Brownfields Property
2217 S. Tryon Street
Charlotte, North Carolina
Brownfields Project ID: 25006-21-060
H&H Job No. PRO-014

1.0 Introduction

On behalf of FHN Holdings, LLC c/o Providence Group Capital, Hart & Hickman, PC (H&H) has
prepared this work plan to conduct Brownfields assessment activities at the Maaco Fleet Solutions
Brownfields property located at 2217 S. Tryon Street in Charlotte, Mecklenburg County, North
Carolina (Site or subject Site). The Site is in the North Carolina Department of Environmental
Quality (DEQ) Brownfields Program (ID# 25006-21-060).

The Site consists of an approximately 1.14-acre parcel of land (Parcel Identification Number
12104401) that is developed with an approximately 8,540-square foot (sq ft) one-story light
industrial warehouse building comprised of office, storage, and service shop areas. The building
is currently vacant but was previously occupied by Maaco Fleet Solutions as a vehicle service
facility and body shop.

The Site recently received a letter of eligibility for entry into the DEQ Brownfields Program
(Brownfields Project No. 25006-21-060) on April 15, 2021. During an initial kick-off meeting
and follow up email correspondence, the DEQ Brownfields Project Manager Pete Doorn reported
that soil and groundwater appears to have been adequately assessed at the Site. However, Mr.
Doorn requested that additional sub-slab soil vapor sampling be completed at the Site to evaluate
current environmental conditions at the Site.

Proposed redevelopment plans include adaptive commercial re-use of the Site as a food court and
beer garden. A Site location map is included as Figure 1.

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Historically, the Brownfields Site appears to have been undeveloped in the earliest historical
source reviewed, an 1890 Sanborn Map. In 1929, a building (depicted on the Sanborn Map utilized
for machinery storage), and a rail spur existed in the northern portion of the Site. In the 1950s, a
building depicted as a small office building (thought to be occupied by Blankenship Brothers
grading contractor) and a building depicted as an auto repair shop/oil storage facility (thought to
be occupied by Queen City Oil) were located in the southern and northeastern portions of the Site,
respectively. In the late 1950s to the 1970s, a gas station with four gasoline tanks (occupied by
Queen City Oil and Mustang Oil service station) operated in the northern portion of the Site. In
the 1980s, B&B Contracting appears to have utilized the Site buildings for office and storage. The
previous structures were demolished and existing Site building was constructed in 1987.
HyrdaStar, a distributor/installer of trailer braking systems, was the original Site occupant. B&B
Automotive and Capstone Builders occupied the Site building in the 2000s and early 2010s,
respectively. Maaco Fleet Solutions operated in the existing Site building from the mid-2010s
until they vacated the building in late 2020/early 2021.

H&H conducted a Phase II ESA Site in October 2020 that included the collection of soil and
groundwater samples for laboratory analysis. The assessment activities were conducted to assess
the potential for impact to the subject Site from historical Site operations, upgradient contaminant
sources, and to evaluate potential risks associated with future Site development. A summary of
the results of the Phase II ESA is provided below.

Soil
 Analytical data indicate that soil in the area of the former gas station (SB-1) located on the
northern portion of the Site is impacted by petroleum constituents at concentrations above
residential Maximum Soil Contaminant Concentrations (MSCCs) and Preliminary Soil
Remediation Goals (PSRGs).

 Analytical data indicate that soil below an oil/water separator (OWS; SB-2) is impacted by
petroleum constituents at concentrations above soil to groundwater MSCCs and protection
of groundwater (POG) PSRGs. Analytical data indicate that soil below one of the two

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subgrade hydraulic lifts (SB-6) is impacted by petroleum constituents at concentrations
above soil to groundwater MSCCs.

 Soil sampled underneath the trench and floor drains, one of the subgrade hydraulic lifts,
and subgrade vault were not impacted with volatile organic compounds (VOCs) or
polycyclic aromatic hydrocarbons (PAHs) above MSCCs or PSRGs.

 Arsenic (ranging from 2.2 to 3.9 mg/kg) was detected in soil at the Site at concentrations
above the industrial/commercial PSRG of 3.0 mg/kg. However, the detected arsenic
concentrations are within the published range of background concentrations for North
Carolina soil and were consistent with the arsenic concentration reported in the SB-BG
background sample. Hexavalent chromium (ranging from 0.6 to 1.5 mg/kg) was detected
at concentrations above the residential PSRG of 0.31 mg/kg. However, the detected
hexavalent chromium concentrations are consistent with the concentration reported in the
SB-BG background sample. Additional metals, including barium, cadmium, lead,
mercury, and selenium, were detected at concentrations below MSCCs, PSRGs,
background concentrations, and/or were generally consistent with published average
background levels for North Carolina soils.

Groundwater
 VOCs (naphthalene, n-propylbenzene, and 1,2,4-trimethylbeznene) and PAHs (indeno
[1,2,3-cd] pyrene and naphthalene) were detected at concentrations above 2L Standards
and residential/non-residential GWSLs in the area of the former gas station (TMW-1).

 Cumulative risk calculations indicate that the non-carcinogenic and carcinogenic risk
levels are above acceptable risk levels for both residential and non-residential exposure
scenarios for groundwater in the northern portion of the Site near TWM-1, but not in the
southern portion of the Site near TMW-2. Therefore, vapor intrusion appears to pose a
potential risk to future residents and non-residential workers at the Site should a building
be developed on the northern portion of the Site.

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On April 20, 2021, a kick-off conference call was held with the DEQ Brownfields project manager
Mr. Doorn, to discuss historical uses at the Site, previous assessment activities, and data gaps
associated with current conditions at the Site in preparation for future re-development. Mr. Doorn
concluded in an email dated April 29, 2021 that sub-slab vapor data is needed to verify that no
mitigation measures are warranted. He indicated that sub-slab results will also provide baseline
data for potential future residential development. Mr. Doorn also reported that if the sub-slab
vapor results confirm that the risk is acceptable, an Environmental Management Plan (EMP) for
the proposed near-term adaptive re-use redevelopment can be prepared and submitted along with
the Brownfields assessment report documenting the results of these proposed sub-slab sampling
activities.

Therefore, this work plan describes proposed assessment activities to address the remaining data
gaps identified during the kick-off meeting and previously agreed upon based upon exchange of a
proposed sample location map. A summary of the proposed Brownfields assessment activities is
discussed further in Section 2.0.

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2.0 Brownfields Assessment Scope of Work

The Brownfields assessment activities will be performed in general accordance with DEQ’s
Inactive Hazardous Sites Branch (IHSB) Guidelines for Assessment and Cleanup (Guidelines)
dated January 2020, the DEQ Division of Waste Management (DWM) Vapor Intrusion Guidance
dated March 2018, and most recent version of the U.S. Environmental Protection Agency (EPA)
Region IV Science and Ecosystem Support Division (SESD) Field Branches Quality System and
Technical Procedures guidance. A proposed sample table is included as Table 1 and the proposed
sample locations are depicted on Figure 2. Our proposed scope of work is presented in the
following sections.

2.1 Sub-Slab Vapor Assessment

To evaluate the potential for vapor intrusion associated with existing Site building, H&H proposes
to install and sample two (2) sub-slab vapor points (SSV-1 and SSV-2) at the following on-Site
locations:

 One sub-slab vapor point (SSV-1) will be installed in the concrete floor of the office portion
of the existing building; and
 One sub-slab vapor point (SSV-2) will be installed in the concrete floor of the garage
portion of the existing building.

H&H will collect the sub-slab vapor samples using Cox Colvin Vapor Pin™ (Vapor Pin) kits. To
install the Vapor Pins, H&H will use a hammer drill to install a countersunk 1.5-inch diameter
hole into the concrete slab to a depth of approximately 1.75 inches. Following advancement of
the countersunk hole, a drill guide will be placed in the hole and a hammer drill equipped with a
5/8-inch diameter bit will be used to further advance the borehole through the concrete slab and
approximately 6 inches into the underlying soil. Following borehole advancement, loose cuttings
will be removed. Then, the Vapor Pin assembly (brass sampling point and silicone sleeve) will be
placed and seated in the drilled hole by tapping the assembly into place using the
installation/extraction tool and a dead blow hammer.

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Prior to collection of the vapor samples, leak checks will be completed for the sub-slab sample
points. The leak check will be performed prior to collecting the vapor samples by first placing a
shroud over each sample point, filling the shroud with helium gas, and using a field helium gas
detector to verify that the shroud is saturated with helium gas. Then, the sample points will be
purged using a syringe and a three-way valve to collect purged vapor into a Tedlar® bag. The
purged vapor will subsequently be analyzed using the helium gas detector to ensure that helium
concentrations are less than 10% of the helium concentrations in the shroud.

Following a successful leak check, the sub-slab vapor samples will be collected using one-liter
Summa® canisters. Shut-in leak tests will be performed on each Summa canister and sampling
train prior to sampling. The Summa® canisters will be connected to the Vapor Pin via Teflon®
tubing. The Summa® canisters will be allowed to fill slowly (less than 200 milliliters per minute
[mL/min]) using an airflow regulator. Prior to and after the samples are collected, vacuum in the
canisters will be measured using a laboratory-supplied vacuum gauge and recorded by sampling
personnel. The vacuum pressure in each Summa canister upon completion of the sampling event
will be between three and six inches of mercury and will not be allowed to reach zero inches of
mercury. The laboratory will be instructed to use reporting limits that are below applicable DEQ
screening levels for the VOCs to the extent possible.

During sample collection, H&H will collect measurements of ambient temperature at the
beginning, middle, and end of the sample collection period in the general areas of the sub-slab
vapor samples. In addition, outside weather will be noted during the sampling period. Following
sample collection, the Summa® canisters will shipped under standard chain-of-custody protocols
to a nationally-accredited air laboratory for analysis of VOCs by EPA Method TO-15. The starting
and ending vacuum in each canister will be recorded on the sample chain-of-custody, and upon
receipt of the samples, the laboratory will record the final received vacuum pressure for each
Summa canister. Each sub-slab vapor sampling point will be abandoned, and the surfaces will be
restored to pre-drilling conditions upon completion of sampling activities.

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2.2 Quality Assurance/Quality Control

Following sample collection, the sample cannisters will be submitted to a nationally-accredited
laboratory for the above-specified analyses under standard chain-of-custody protocol.

For field and laboratory quality assurance/quality control (QA/QC) purposes, H&H will collect
one duplicate sample via a “T” in the sample from one of the proposed sub-slab points. Sufficient
sample will be collected in the field and the duplicate sample also will be analyzed for VOCs by
EPA Method TO-15. In addition, H&H will request a Level II QA/QC data package from the
laboratory and the laboratory will report values to the laboratory-specified method detection limits
using J-flags.

2.3 Boring Abandonment and Investigation Derived Waste

Upon completion of the sub-slab vapor sampling activities, H&H will leave the sample points in
place in the event that an additional round of sub-slab vapor samples is required. H&H does not
anticipate generating any significant amount of investigation derived waste during installation of
the sub-slab vapor sample points.

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3.0 Reporting

Upon completion of the field activities and receipt of the analytical data, H&H will prepare a report
which describes the methods and results of the Brownfields assessment activities. The report will
include a description of field activities, a tabular summary of the analytical results in comparison
to regulatory screening levels, a figure depicting the sample locations, laboratory analytical reports
including chain of custody records and sample receipt documents, a discussion of QA/QC data,
and conclusions based upon our assessment activities. The report will be sealed by a North
Carolina professional engineer (PE) or licensed geologist (LG) and the firm’s PE/LG numbers will
be provided.

Table
Table 1Proposed Sample TableMaaco Fleet Solutions Brownfields Property2217 S. Tryon StreetCharlotte, North CarolinaBrownfields Project ID: 25006-21-060H&H Job No. PRO-011General Site Location Sample Objective Sample ID Sample MediaProposed Sample Depth*** (feet)VOCs by EPA Method TO-15Duplicate SampleOffice AreaFuture Worker/ Occupant Risk AssessmentSSV-1 Sub-Slab Vapor 0.5 X XService GarageFuture Worker/ Occupant Risk AssessmentSSV-2 Sub-Slab Vapor 0.5 X Notes:*** = final depth to be determined based upon conditions observed in the fieldVOCs = volatile organic compoundsEPA = Environmental Protection Agency Brownfields Assessment M:\AAA-Master Projects\Providence Group (PRO)\PRO-014 2217 S Tryon Street (Maaco Service)\Brownfields\Work Plan\Proposed Sample Table15/11/2021Table 1 (Page 1 of 1) Hart & Hickman, PC

Figures
0 2000 4000
APPROXIMATE
SCALE IN FEET
N
U.S.G.S. QUADRANGLE MAP
QUADRANGLE
7.5 MINUTE SERIES (TOPOGRAPHIC)
CHARLOTTE EAST, NORTH CAROLINA 1991
TITLE
PROJECT
SITE LOCATION MAP
MAACO FLEET SOLUTIONS
2217 S. TRYON STREET
CHARLOTTE, NORTH CAROLINA
DATE:
JOB NO:
REVISION NO:
FIGURE:
9-24-20 0
1PRO-014
SITE
REVISION NO. 0
JOB NO. PRO-014
DATE: 5-11-21
FIGURE NO. 2
MAACO FLEET SOLUTIONS CENTER
2217 SOUTH TRYON STREET
CHARLOTTE, NORTH CAROLINA
PROPOSED SUB-SLAB SAMPLE LOCATION MAP
LEGEND
SITE PROPERTY BOUNDARY
PARCEL BOUNDARY
DUMPSTER
OIL WATER SEPARATOR
FLOOR DRAIN
TRENCH DRAIN
IN-GROUND LIFT
FORMER GASOLINE UST BASIN
FORMER SOIL BORING
LOCATION
FORMER CO-LOCATED SOIL
BORING AND TEMPORARY
MONITORING WELL LOCATION
PROPOSED SUB-SLAB SAMPLE
LOCATION
2923 South Tryon Street-Suite 100
Charlotte, North Carolina 28203
704-586-0007(p) 704-586-0373(f)
License # C-1269 / #C-245 Geology
TMW-1/SB-1INNER PEAKS
(2220 S. TRYON STREET)
MARATHON GAS STATION
(2200 S. TRYON STREET)
VACANT RESIDENCES
K9 PLAYLAND
(2139 S. TRYON STREET)
WAREHOUSE
FORTUNE JOHNSON
(300 RAMPART STREET)
APARTMENTS
(2240-2256 HAWKINS STREET AND
2115-2135 DUNAVANT STREET)
R
AM
P
A
R
T

S
T
R
E
E
T
S. TRYON STREETD
U
N
A
V
A
N
T

S
T
R
E
E
T
FORMER GAS
STATION
OFFICE / STORAGE
PAINT BOOTH
SHOP
NOTES:
1. AERIAL IMAGERY OBTAINED FROM MECKLENBURG
COUNTY GIS (2020).
2. UST = UNDERGROUND STORAGE TANK
KELLY & MCARDLE
(2301 S. TRYON STREET)
SUBGRADE VAULT
FORMER GASOLINE
UST BASIN
TMW-2/SB-2
SB-6SB-5
SB-4
SB-7
SB-3
SB-BG

Appendix A

Previous Data Tables and Figures
Table 1Summary of Soil Analytical ResultsMaaco Fleet Services2217 S. Tryon StreetCharlotte, North CarolinaH&H Job No. PRO-014Sample LocationFormer Gas StationOWSSubgrade VaultBackgroundSample IDSB-1 SB-2 SB-3 SB-4 SB-5 SB-6 SB-7 SB-BGDate Collected10/21/2020 10/21/2020 10/21/2020 10/21/2020 10/21/2020 10/21/2020 10/21/2020 10/21/2020Depth (ft)6-8 7-9 2-4 2-4 10-12 10-12 4-5 0.5-1VOCs (8260B/5035A)Acetone<0.0910.030 CCVH<0.00180.027 CCVH<0.0015 <0.0016 <0.0015NA24 14,000 360,000 25 12,000 140,000-- --n-Butylbenzene6.5<0.00066 <0.00065 <0.00053 <0.00056 <0.00058 <0.00053NA4.3 626 16,350 4.5 780 12,000-- --sec-Butylbenzene3.8<0.00076 <0.00075 <0.00061 <0.00064 <0.00067 <0.00061NA3.3 626 16,350 4.1 1,600 23,000-- --tert-Butylbenzene 0.69<0.00084 <0.00083 <0.00068 <0.00071 <0.00074 <0.00068NA3.4 626 16,350 3.1 1,600 23,000-- --Ethylbenzene1.1<0.0011 <0.0010 <0.00086 <0.00089 <0.00093 <0.00086 NA4.9 1,560 40,000 13 6.1 27-- --Isopropylbenzene (Cumene)0.69<0.00082 <0.00081 <0.00066 <0.00069 <0.00072 <0.00066NA1.7 1,564 40,880 2.3 410 2,100-- --4-Isopropyltoluene4.1<0.0018 <0.0018 <0.0014 <0.0015 <0.0016 <0.0014NA0.12 100 4,000 NE NE NE-- --Naphthalene7.30.0013 J<0.00070 <0.00057 <0.00060 <0.00063 <0.00058NA0.16 313 8,176 0.39 2.1 8.8-- --n-Propylbenzene1.5<0.0010 <0.0010 <0.00082 <0.00086 <0.00090 <0.00083NA1.7 626 16,350 2.6 780 5,100-- --1,2,4-Trimethylbenzene20<0.00075 <0.00074 <0.00060 <0.00063 <0.00066 <0.00060 NA8.5 782 20,440 12 63 370-- --1,3,5-Trimethylbenzene 0.69<0.00089 <0.00088 <0.00071 <0.00075 <0.00078 <0.00072NA8.3 782 20,440 11 56 320-- --m,p-Xylenes 0.35 J<0.0018 <0.0018 <0.0015 <0.0015 <0.0016 <0.0015NA4.6 3,129 81,760 9.8 120 500-- --o-Xylene 0.067 J<0.00075 <0.00074 <0.00060 <0.00063 <0.00066 <0.00061NA4.6 3,129 81,760 9.8 140 590-- --Total Xylenes 0.42 J<0.0025 <0.0025 <0.0020 <0.0021 <0.0022 <0.0020 NA4.6 3,129 81,760 9.9 120 530-- --PAHs (8270)Acenaphthene 0.54 J 0.19 J<0.021 <0.019 <0.023 <0.021 <0.019NA8.2 940 24,000 16 720 9,000-- --Acenaphthylene 1.7<0.019 <0.018 <0.017 <0.020 <0.018 <0.017NA11 469 12,264 NE NE NE-- --Fluoranthene 0.087 J<0.011 <0.010 <0.0096 <0.011 <0.011 <0.0095NA290 620 16,400 670 480 6,000-- --1-Methylnaphthalene660.49 J<0.014 <0.013 <0.0150.041 J<0.013NA0.004 20 100 0.11 18 73-- --2-Methylnaphthalene960.090 J<0.018 <0.016 <0.0190.042 J<0.016NA3.6 63 1,635 3.1 48 600-- --Naphthalene8.3<0.021 <0.019 <0.018 <0.021 <0.020 <0.018NA0.16 313 8,176 0.39 2.1 8.8-- --Phenanthrene 5.8 0.79 J<0.010 <0.0092 <0.0110.055 J<0.0091NA56 469 12,264 NE NE NE-- --Pyrene<0.0140.65 J<0.013 <0.012 <0.014 <0.014 <0.012 NA270 469 12,264 440 360 4500-- --RCRA Metals (6020B/7471B/7196A)ArsenicNA2.2 3.9 3.6NA NA3.2 2.9NE NE NE 5.8 0.68 3 1.0-18 4.8BariumNA180 33 54NA NA43 77290 3,100 81,000 580 3,100 47,000 50-1,000 356CadmiumNA<0.054 <0.051 <0.047NA NA<0.0480.28 JNE NE NE 3 7.5 110 1.0-10 4.3Hexavalent ChromiumNA0.6 1.5 1.1NA NA1.1 1.15.4 47 1,226 3.8 0.31 6.5 7.0-300 65Trivalent ChromiumNA169.4 148.5 56.9NA NA56.9 35.9 4,20023,460 613,200 360,000 23,000 350,000 NE NEChromium (Total)NA170 150 58NA NA58 37NE NE NE NE NE NE NE NELeadNA3.7 8.1 11NA NA8.9 160270 400 400 270 400 800 ND-50 16MercuryNA0.029 J 0.063 J 0.11NA NA0.13 0.079NE NE NE 1 2.3 9.7 0.03-0.52 0.121SeleniumNA12 2.7 3.1NA NA2.8 2.5NE NE NE 2.1 78 1,200 <0.1-0.8 0.42SilverNA<0.075 <0.070 <0.065NA NA<0.0660.091 J0.25 78.2 2,044 3.4 78 1,200 ND-5.0 NENotes:Units are milligram/kilogram (mg/kg)1) NC Department of Environmental Quality (DEQ) Underground Storage Tank (UST) Maximum Soil Contaminant Centration Levels (MSCCs)2) NC DEQ Preliminary Soil Remediation Goals (PSRG) dated July 2020Method number follows parameter in parenthesis Only constituents detected in at least one sample are shown above; refer to the laboratory reportbold values exceed Soil to Groundwater MSCCs, and background levels (if applicable)underline values exceed Protection of Groundwater PSRGs, and background levels (if applicable)yellow highlighted values exceed Residential PSRGs, and background levels (if applicable)green highlighted valued exceed Residential MSCCs, Residential PSRGs, and background levels (if applicable)SB = Soil Boring; VOCs = volatile organic compounds; PAHs = polyaromatic hydrocarbons; RCRA = Resource Conservation and Recovery Act NE = Not Established; NA = Not Analyzed; '-- = Not ApplicableJ = estimated value between the laboratory detection limit and the laboratory reporting limitE = estimated concentration above the calibration rangeCCVH = CCV result is above control limits but within method parameters. Result is considered estimated< = below laboratory method detection limitMeanResidential PSRGsProtection of Groundwater PSRGsDEQ UST Section Screening Levels¹Industrial/ Commercial PSRGsDEQ Brownfields Screening Levels²Regional Background Metals in Soil³Range3) Range and mean values of background metals for North Carolina soils taken from Elements in North American Soils by Drugan and Chekiri, 2005.Floor DrainsSubgrade Hydraulic LiftsIndustrial/ Commercial MSCCsResidential MSCCsSoil to Groundwater MSCCsS:\AAA-Master Projects\Providence Group Capital (PRO)\PRO-014 2217 S Tryon Street (Maaco Service)\Phase II\Tables\Phase II ESA-PRO11/9/2020Table 1Hart & Hickman, PC
Table 2
Summary of Temporary Well Construction
Maaco Fleet Services
2217 S. Tryon Street
Charlotte, North Carolina
H&H Job No. PRO-014
Well Well Screen Water
Monitoring Well Diameter Depth Interval Lithology Table Depth
Identification (inches) (ft) (ft) (ft bgs)
TMW-1 10/21/2020 1 18 8-18 Soil 11.50
TMW-2 10/21/2020 1 28 13-28 Soil 12.99
Notes:
ft bgs = feet below ground surface
TMW= temporary monitoring well
Installation Date
Depth to groundwater measurements were collected from monitoring wells TMW-1 and TMW-2 on
October 21, 2020
S:\AAA-Master Projects\Providence Group Capital (PRO)\PRO-014 2217 S Tryon Street (Maaco Service)\Phase II\Tables\Phase II ESA-PRO
11/9/2020
Table2
Hart & Hickman, PC
Table 3
Summary of Groundwater Analytical Results
Maaco Fleet Services
2217 S. Tryon Street
Charlotte, North Carolina
H&H Job No. PRO-014
Sample Location Former Gas Station OWS
Sample ID TMW-1 TMW-2
Date 10/21/2020 10/21/2020
VOCs (8260B) µg/L
Benzene 0.86 <0.048 0.86 1 1.6 6.9
2-Butanone 22 <0.24 22 4,000 450,000 1900000
n-Butylbenzene 17 <0.076 17 70 NE NE
sec-Butylbenzene 14 <0.076 14 70 NE NE
tert-Butylbenzene 1.5 <0.088 1.5 70 NE NE
Ethylbenzene 120 <0.061 120 600 3.5 15
2-Hexanone 1.5 J <0.065 1.5 J 40 1600 6900
Isopropylbenzene (Cumene) 52 <0.054 52 70 180 750
4-Isopropyltoluene 6.6 <0.089 6.6 25 NE NE
Methyl Isobutyl Ketone 1.4 J <1.0 1.4 J 100 110,000 470000
Naphthalene 260 0.91 J 260 6 4.6 20
n-Propylbenzene 160 <0.087 160 70 490 2000
1,2,4-Trimethylbenzene 780 <0.054 780 400 50 210
1,3,5-Trimethylbenzene 270 <0.076 270 400 35 150
m,p-Xylenes 130 <0.12 130 500 71 300
o-Xylene 27 <0.044 27 500 98 410
Xylenes, total 160 <0.15 160 500 77 320
PAHs (8270) µg/L
Acenaphthene 0.766 0.0734 0.766 80 NE NE
Anthracene <0.00266 0.00677 J,B 0.00677 J,B 2,000 NE NE
Benzo(a)anthracene 0.0333 B 0.0172 J,B 0.0333 B 0.05 34 420
Benzo(a)pyrene 0.0242 B 0.00948 J,B 0.0242 B 0.005 NE NE
Benzo(b)fluoranthene 0.0320 B 0.0110 J,B 0.0320 B 0.05 NE NE
Chrysene 0.0196 J,B 0.00408 J,B 0.0196 J,B 5NENE
Fluoranthene 0.0278 B 0.00895 J,B 0.0278 B 300 NE NE
Fluorene 1.65 0.192 1.65 300 NE NE
Indeno(1,2,3-cd)pyrene 0.0971 <0.00627 0.0971 0.05 NE NE
1-Methnaphthalene 68.6 0.0637 68.6 NE NE NE
2-Methnaphthalene 108 0.0539 108 30 NE NE
Naphthalene 91.8 0.0587 91.8 6 4.6 20
Phenanthrene 1.97 0.0236 B 1.97 200 NE NE
Pyrene 0.0222 <0.00582 0.0222 200 NE NE
Cumulative Risks - Resident
Carcinogenic Risk 9.2E-05 2.0E-07 9.2E-05 -- -- --
Non-Carcinogenic Hazard Index 6.8 5.2E-03 6.8 -- -- --
Cumulative Risks - Non-
Resident Worker
Carcinogenic Risk 2.1E-05 4.5E-08 2.1E-05 -- -- --
Non-Carcinogenic Hazard Index 1.6 1.2E-03 1.6 -- -- --
Notes:1) North Carolina 15A NCAC 02L Groundwater Standards (NC 2L Standards) dated April 20132) North Carolina Residential Vapor Intrusion Groundwater Screening Levels (GWSL) dated July 202
Bold values exceed NC 2L Standards
underlined values exceed NC Residential Vapor Intrusion GWSL s
yellow highlighted values exceed NC Non-Residential Vapor Intrusion GWSLs
italicized values exceed acceptable Non-Carcinogenic Hazard Index (1.0)Method detection limits are shown above for non-detection
Constituents detected in at least one sample are shown above; refer to the laboratory reporMethod number follows parameter in parenthesi
µg/L = micrograms/literVOCs = volatile organic compounds; PAHs = polyaromatic hydrocarbon
TMW= temporary monitoring well
J = estimated concentrations above the adjusted method detection limit and below the adjusted reporting limit
-- = not applicable; NE = Not Established
NC 2L Standards
NC Residential
Vapor Intrusion
GWSL
NC Non-
Residential Vapor Intrusion
GWSL
Worst-Case Scenario
S:\AAA-Master Projects\Providence Group Capital (PRO)\PRO-014 2217 S Tryon Street (Maaco Service)\Phase II\Tables\Phase II ESA-PRO11/9/2020
Table 3
Hart & Hickman, PC