18038_AquairII_VI Evaluation_ West Side_20230613

Via Email

June 13, 2023 North Carolina Department of Environmental Quality Division of Waste Management – Brownfields Program
1646 Mail Service Center
Raleigh, North Carolina 27699-1646 Attn: Ms. Carolyn Minnich

Re: Vapor Intrusion Evaluation – Proposed Southern Building AquAir II Brownfields Site - West Side 13300 Sam Neely Road Charlotte, North Carolina
Brownfields Project No. 18038-14-060 H&H Job No. TKC-008 Dear Carolyn:

1.0 Introduction
On behalf of TKC CCCX, LLC (the current property owner), Hart & Hickman, PC (H&H) has
prepared this letter to evaluate the need for vapor intrusion mitigation measures for the proposed
southern warehouse building on the west side of the AquAir II Brownfields property
(Brownfields Project No. 18038-14-060) located in the 13300 Sam Neely Road in Charlotte,
Mecklenburg County, North Carolina (the Site). The Brownfields agreement for the AquaAir II
property includes two contiguous parcels, totaling approximately 154 acres, which are separated
by the Southern Railway tracks. The subject Site consists of the portion of the Brownfields
property to the west of the railway, which is an approximately 80-acre parcel (Mecklenburg
County Parcel ID 20141101). The portion of the Brownfields property to the east of the railroad
tracks was previously redeveloped with a warehouse building for Staples, Inc. in 2017/2018 and
is currently owned by Gear 3725 Westinghouse LLC. A Site location map is provided as Figure
1.

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Redevelopment at the Site is being completed in two phases. The first phase of redevelopment
includes construction of one industrial warehouse building, a guardhouse, a fire pumphouse,
associated outdoor storage areas, roadways and parking, and a railroad extension which are
nearing completion in the northern portion of the Site (referred to herein at the “northern
warehouse building”). The Site is being prepared for the second phase of redevelopment which
will include construction of a second industrial warehouse building, located in the southern
portion of the Site and to the south of the future Carowinds Boulevard (referred to herein as the
“southern warehouse building”). The two industrial warehouse footprints and associated
roadways and parking areas are depicted on Figure 2.

As shown on Figure 2, the northern warehouse building, which is nearing completion, was
constructed within the “Limits of Groundwater Contamination” and the “Area of Possible Soil
Contamination”, as identified on the Brownfields Agreement recorded for the Brownfields
property. Due to the proximity to the identified areas of potential soil and groundwater
contamination, a vapor intrusion mitigation system was installed in the northern warehouse
building in accordance with the DEQ-approved Vapor Intrusion Mitigation Plan dated March 16,
2022.

Land Use Restriction “h.” in the Notice of Brownfields Property for the agreement indicates that
that no building may be constructed on the property unless DEQ determines in writing that the
building would be sufficiently distant from the property’s known soil or groundwater
contamination or a plan for vapor mitigation is approved and implemented. The southern
warehouse building will be constructed outside of the identified soil and groundwater
contamination areas. H&H has prepared this letter to evaluate whether vapor intrusion
mitigation controls are warranted for the southern warehouse building in accordance with the
Brownfields agreement. A brief discussion of Site conditions and historical sampling in the
vicinity of the proposed southern warehouse building is included below.
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2.0 Vapor Intrusion Evaluation
To evaluate the planned southern warehouse building in relation to the soil and groundwater
impacts, H&H compared the proposed building plan, the location of the volatile organic
compound (VOC) groundwater plume, the location of the potential soil impacts, and historical
groundwater and soil gas analytical data in the vicinity of the planned building. A figure
depicting the proposed development in relation to the known areas of soil and groundwater
impacts is attached as Figure 2. In addition, tabular summaries of the historical groundwater and
soil gas data from sample locations near the southern warehouse building are also attached.
Note, the monitoring wells discussed below were abandoned prior to construction of the northern
warehouse building with DEQ Brownfields concurrence or were temporary monitoring wells.

2.1 Historical Sampling Activities

In 1992, as part of Remedial Site Investigation activities, shallow groundwater monitor wells
MW-1 through MW-10 were installed at the Site. Groundwater monitor wells MW-4, MW-5,
MW-6, and MW-7 were located along the southern portion of Limits of Groundwater
Contamination, which was delineated during later Site activities, and the closest groundwater
sample locations to the proposed southern warehouse building. The groundwater monitor wells
were first sampled in March 1992, and analytical results indicate that no compounds were
detected above the North Carolina Department of Environmental Quality (NCDEQ) 15A NCAC
02L.0202 Ground Water Quality Standards (2L Standards) with the exception of carbon
tetrachloride, tetrachloroethene (PCE), and trichloroethene (TCE) in monitor well MW-6, and
methylene chloride, a common laboratory contaminant, in MW-7. Monitor well MW-6 is
located downgradient of the former Site operations and away from the proposed southern
warehouse. Neither PCE nor TCE were detected in wells MW-4, MW-5, and MW-7 during the
1992 event and no other compounds were detected above the 2L Standards.

A Remedial Action Plan (RAP) was prepared for the Site in December 2003 in which a pump
and treat system was proposed to address shallow groundwater impacts and a RAP Amendment
was submitted in April 2004 to modify the stages of the proposed remedies. In accordance with
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the RAP and RAP Amendment, groundwater sampling was completed for the Site between 2004
and 2011. Monitor wells MW-4, MW-5, and MW-6 were sampled in 2004, 2005, and 2011, and
analytical results from each event indicate that neither PCE nor TCE were detected in the
monitor wells during the sampling events. Tabular summaries of historical groundwater
analytical results from previous reports are included as Appendix A.

In December 2015, Terracon completed soil, groundwater, and soil vapor assessment at the Site
and results of the assessment activities indicated that low levels of PCE and TCE were detected
in monitoring well MW-5 below what is now the southeast corner of the northern warehouse
building. The detected PCE and TCE concentrations in MW-5 exceeded the 2L Standards and
are shown on Figure 2. Terracon also installed four soil gas monitoring points, SV-01 through
SV-04, for collection of soil gas samples along the southwestern boundary of the soil and
groundwater impacts. Soil gas analytical results indicated that no compounds were detected
above the DEQ Non-Residential Sub-Slab and Exterior Soil Gas Screening Levels (SGSLs)
dated January 2023, and neither PCE nor TCE were detected in the soil gas samples. Tabular
summaries of the groundwater and soil gas analytical results from the Terracon report are
included in Appendix A.

In January 2016, H&H conducted additional groundwater and soil vapor assessment activities
south of MW-5 to evaluate groundwater conditions and the potential for soil vapor concerns in
the southern portion of the site. The co-located temporary groundwater monitoring wells
(TMW-1 through TMW-3) and soil gas monitoring point locations (VMP-1 through VMP-3)
were installed at successive, approximately 200 to 250 ft distances between monitoring well
MW-5 and the southern Site boundary. In addition, H&H collected one groundwater sample
from existing Site monitor well MW-6 located east of what is now the northern warehouse
building. Note that direct-push technology drilling refusal was encountered at proposed wells
TMW-1 and TMW-2, therefore no groundwater samples were collected at those locations.

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2.2 Groundwater Sampling Analytical Results

A tabular summary of groundwater sample analytical results for previous monitor wells located
near the southern warehouse building sampled by H&H in 2016 is presented in Table 1. The
groundwater data is compared to the 2L Standards and the DEQ Non-Residential Vapor
Intrusion Groundwater Screening Levels (GWSLs) dated January 2023. A discussion of the
analytical results is presented below.

Analytical results of the groundwater sample collected from existing monitor well MW-6,
located in the northeastern portion of the Site and downgradient of MW-5, indicate that several
VOCs were detected above the laboratory method detection limit. PCE (38 µg/L), and TCE (8.2
µg/L) were detected at concentrations exceeding the 2L Standards of 0.7 µg/L and 3.0 µg/L,
respectively. Additionally, the TCE concentration exceeds the Non-Residential GWSL of 4.4.
No other compounds were detected above the 2L Standards or GWSLs in monitor well MW-6.

Analytical results of the groundwater sample collected from temporary monitoring well TMW-3,
along the southern Site boundary, indicate that no VOCs were detected above the 2L Standards
or the GWSLs. Neither PCE nor TCE were detected above the laboratory method detection limit
in the TMW-3 groundwater sample.

The groundwater analytical results are consistent with the Limits of Groundwater Contamination
as defined in the Brownfields Agreement. Groundwater flow direction is generally to the
northeast, and groundwater impacts are limited to the northeastern portion of the Site. Therefore,
the groundwater impacts are not located in proximity to the proposed warehouse building in the
southern portion of the Site, and groundwater does not flow from the area of groundwater
impacts toward the southern warehouse building.

2.3 Soil Gas Sampling Analytical Results
A tabular summary of the soil gas sample analytical results collected during the January 2016
assessment is presented in Table 2. The soil gas analytical data is compared to the DEQ Non-
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Residential Sub-Slab and Exterior Soil Gas Screening Levels (SGSLs) dated January 2023. A
discussion of the analytical results is presented below.

Analytical results for the soil gas samples indicate that several VOCs including PCE were
detected above laboratory reporting limits in each sample. However, no compound
concentrations were detected above SGSLs. The highest PCE concentration (20 µg/m3) was
detected in VMP-1 which is the most northern sample location and the furthest distance from the
proposed southern building. The PCE concentrations indicate a decreasing trend toward the
south and away from the impacted groundwater source area. TCE was not detected above
laboratory reporting limits in any of the three soil gas samples.

2.4 Vapor Intrusion Evaluation

The DEQ Vapor Intrusion SGSLs are conservative and based on a lifetime incremental cancer
risk (LICR) of 1 x 10-6 and a hazard quotient (HQ) of 0.2 for potential non-carcinogenic risks.
The DEQ and EPA acceptable risk level for potential carcinogenic risks is a cumulative LICR of
1 x 10-4 or less, and the acceptable level for non-carcinogenic risks is a cumulative HI of 1.0 or
less. The HI is the sum of hazard quotients (HQs) for each target analyte detected in a sample.

To further evaluate soil gas concentrations, H&H utilized the DEQ Risk Calculator (January
2023) to calculate potential vapor intrusion risks for the southern part of the Site. H&H modeled
a worst-case scenario by using the highest concentrations of any compound detected in any soil
gas sample collected during the January 2016 assessment. Based on the planned uses of the
proposed southern warehouse building, H&H calculated risks assuming a non-residential use
scenario. A copy of the completed DEQ Risk Calculator is provided in Appendix A.

The non-residential worst-case risk calculation for the southern part of the Site using the 2016
soil gas data indicates a calculated cumulative LICR of 1.6 x 10-7 and a HI value of 0.014. The
calculated cumulative LICR and HI values are within the acceptable levels established by the
DEQ and EPA. Thus, the soil gas analytical results and risk calculations indicate that vapor
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Attachments: Table 1 Summary of Groundwater Analytical Data
Table 2 Summary of Soil Gas Analytical Data

Figure 1 Site Location Map
Figure 2 Site and Sample Location Map

Appendix A Historical Groundwater and Soil Gas Analytical Results
Appendix B DEQ Risk Calculator
Table 1
Summary of Groundwater Analytical Data
AquAir II Brownfields Site - West Side
Charlotte, North Carolina
H&H Job No. TKC-008
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TMW-3 1/20/2016 0.25 J <0.16 <0.21 <0.15 <0.17 <0.20 NA NA NA
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3.6 33 160 210 48 4.4 NE NE NE
Notes:
1) North Carolina Department of Environmental Quality (DEQ) 15A North Carolina Administrative Code 02L.0202 Groundwater Quality Standard (2L Standard) dated April 2022.
2) DEQ Non-Residential Vapor Intrusion Groundwater Screening Levels (GWSLs) (January 2023).
Concentrations are reported in micrograms per liter (µg/L).
Compound concentrations are reported to the laboratory method detection limits.
Laboratory analytical method is shown in parentheses.
Only compounds detected above laboratory method detection limits in at least one sample are shown in this table
Bold values indicate an exceedance of the NC 2L Standard .
Underlined values indicate an exceedance of the DEQ Non-Residential GWSL.
VOC = volatile organic compound; NA = Not Analyzed; NE = Not Established
J = Compound was detectedabove the laboratory method detection limit, but below the laboratory reporting limit resulting in a laboratory estimated concentration.
Non-Residential GWSL2
VOCs (8260B) (µg/L)
NC 2L Groundwater Standard(1)
Metals (6010) (µg/L)
https://harthick.sharepoint.com/sites/MasterFiles-1/Shared Documents/AAA-Master Projects/McGrath - MGR/MGR-002/Tables/McGrath GW TableFile
Table 1 (Page 1 of 1)
Hart & Hickman, PC
Table 2
Summary of Soil Gas Analytical Data
AquAir II Brownfields Site - West Side
Charlotte, North Carolina
H&H Job No. TKC-008
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VMP-1 01/20/16 TO-15 22 15 1.8 2.9 0.53 <0.98 1.00 <0.69 1.7 <0.92 9.1 31 3.8 27 24 3.3 290 0.36 20 240 2.5 0.64 15 2.1 130 39
VMP-2 01/20/16 TO-15 170 8.9 15 7.2 <1.3 0.23 <0.83 4.9 2.2 5.0 <15 9.9 1.7 550 20 1.1 520 0.65 2.6 700 2.7 0.49 3.1 1.0 30 10
VMP-3 01/20/16 TO-15 11 1.0 1.0 <6.2 0.45 <0.98 1.4 2.8 1.6 <0.92 <15 4.4 0.29 510 2.0 1.6 27 <0.85 0.46 450 1.5 0.58 0.79 0.24 15 4.0
NE 160 440,000 61,000 200 53 7,900 530,000 8,800 330 NE 490 NE 35,000 61,000 53,000 260,000 88,000 3,500 440,000 NE 440,000 5,300 5,300 8,800 8,800
Notes:
1) DEQ Non-Residential Vapor Intrusion Sub-Slab and Exertior Soil Gas Screening Levels (SGSLs) dated January 2023.
Concentrations are reported in micrograms per cubic meter (µg/m3).
Compound concentrations are reported to the laboratory reporting limits.
Non-Residential SGSL(1)
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https://harthick.sharepoint.com/sites/MasterFiles-1/Shared Documents/AAA-Master Projects/McGrath - MGR/MGR-002/Tables/McGrath GW Table
Table 1 (Page 1 of 1)
Hart & Hickman, PC
BROWNFIELDS
PROPERTY
0 2000 4000
APPROXIMATE
SCALE IN FEET
N
U.S.G.S. QUADRANGLE MAP
QUADRANGLE
7.5 MINUTE SERIES (TOPOGRAPHIC)
CHARLOTTE WEST, NORTH CAROLINA, 1996
TITLE
PROJECT
SITE LOCATION MAP
AQUAIR II BROWNFIELDS SITE - WEST SIDE 13300 SAM NEELY ROAD
CHARLOTTE, NORTH CAROLINA
DATE:
JOB NO:
REVISION NO:
FIGURE:
10-28-21 0
1TKC-008
SITE
BOUNDARY
CR
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CRCR
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VMP-3
VMP-2
VMP-1
TMW-3
TMW-2
TMW-1DRY
DRY
MW-5
MW-6
MW-7
MW-4
SV-01
SV-02
SV-03
SV-04
SV-04 (μg/m3)12/15/15PCENDTCEND
REVISION NO. 0
JOB NO. TKC-008
DATE: 6-13-23
FIGURE NO. 2
AQUAIR II BROWNFIELDS SITE - WEST SIDE
13300 SAM NEELY ROAD
CHARLOTTE, NORTH CAROLINA
SITE AND 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
LEGEND
BROWNFIELDS PROPERTY BOUNDARY
SITE BOUNDARY
LIMITS OF GROUNDWATER CONTAMINATION
RAILROAD TRACKS
SURFACE WATER FEATURE
FENCE LINE
COMPLETED NORTHERN BUILDING
FOOTPRINT
PROPOSED SOUTHERN BUILDING
FOOTPRINT
AREA OF POSSIBLE SOIL
CONTAMINATION
GROUNDWATER MONITORING WELL
TEMPORARY GROUNDWATER MONITORING
WELL
TEMPORARY SOIL GAS MONITORING POINT
INFERRED GROUNDWATER FLOW
DIRECTION
SAM NEELY ROAD
ALRO STEEL CORP.
(12933 SAM NEELY ROAD)
LAZY OAK LANE
RESIDENTIALRESIDENTIAL
TEXAS PIPE & SUPPLY CO.
(12910 SAM NEELY ROAD)
EXISTING STAPLES
WAREHOUSE BUILDING
STORMWATER MANAGEMENT
POND
SOURCES
1.SITE PLAN PROVIDED BY BURTON ENGINEERING.
FUTURE
CAROWINDS
BOULEVARD
TMW-3 (μg/L)
1/20/16
PCE ND
TCE ND
VMP-3 (μg/m3)
1/20/16
PCE 0.46
TCE ND
VMP-2 (μg/m3)
1/20/16
PCE 2.6
TCE ND
VMP-1 (μg/m3)
1/20/16
PCE 20
TCE ND
SAMPLE DATE
NOTES:
1.GROUNDWATER CONCENTRATIONS REPORTED
IN MICROGRAMS PER LITER (μg/L) AND SOIL GAS
CONCENTRATIONS REPORTED IN MICROGRAMS
PER CUBIC METER (μg/m3).
2.PCE = TETRACHLOROETHENE
TCE = TRICHLOROETHENE
3.BOLD INDICATES CONCENTRATION EXCEEDS
NORTH CAROLINA DEQ 15A NCAC 02L.0202
GROUNDWATER STANDARD (2L STANDARDS)
4.UNDERLINE INDICATES CONCENTRATION
EXCEEDS NON-RESIDENTIAL GROUNDWATER
SCREENING LEVEL.
5.MW-5 GROUNDWATER SAMPLE COLLECTED BY
TERRACON ON DECEMBER 22, 2015.
MW-6 (μg/L)
1/20/16
PCE 38
TCE 8.2
MW-5 (μg/L)
12/22/15
PCE 69.1
TCE 4.9
MW-6
1/20/16
PCE 38
TCE 8.2
COMPOUND CONCENTRATION
(SEE NOTE 1)
SAMPLE ID
MW-7 (μg/L)
9/29/92
PCE ND
TCE ND
MW-4
3/2/05
PCE ND
TCE ND
SV-04 (μg/m3)
12/15/15
PCE ND
TCE ND
SV-01 (μg/m3)
12/15/15
PCE ND
TCE ND
SV-02 (μg/m3)
12/15/15
PCE ND
TCE ND SV-03 (μg/m3)
12/15/15
PCE ND
TCE ND

Appendix A Historical Groundwater and Soil Gas Analytical Results
Contaminant of Concern
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15A NCAC 2L Groundwater Stds. or IMAC *0.0006 *NS
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o
e
t
h
a
n
e
mg/L
0.2
1,1
,
2
-
T
r
i
c
h
l
o
r
o
e
t
h
a
n
e
mg/L
Tri
c
h
l
o
r
o
e
t
h
e
n
e
1,1
,
2
,
2
-
T
e
t
r
a
c
h
l
o
r
o
e
t
h
a
n
e
mg/L
0.0002
Te
t
r
a
c
h
l
o
r
o
e
t
h
e
n
e
mg/L
0.0007
To
t
a
l

1
,
2
-
D
i
c
h
l
o
r
o
e
t
h
e
n
e
mg/L
0.06
Me
t
h
y
l
e
n
e

c
h
l
o
r
i
d
e
mg/L
0.005
1,2
-
D
i
c
h
l
o
r
o
e
t
h
a
n
e
mg/L
0.0004
1,1
-
D
i
c
h
l
o
r
o
e
t
h
e
n
e
mg/L
0.007
Ch
l
o
r
o
f
o
r
m

mg/L
0.07
1,1
-
D
i
c
h
l
o
r
o
e
t
h
a
n
e
mg/L
0.0060.0003
mg/L
Ca
r
b
o
n

t
e
t
r
a
c
h
l
o
r
i
d
e
Ch
l
o
r
o
b
e
n
z
e
n
e

mg/L
0.05
Be
n
z
e
n
e
mg/L
0.001
2-
B
u
t
a
n
o
n
e

(
M
E
K
)
mg/L
4
Analytical Method
Table 3
Summary of Historical Groundwater Sampling Result
AquaAi
Incident # 074511361
EPA Method 8260 EPA Method 8270
EPA
Method
245.1
EPA Method 3010
DW-2 06/04/04 ND ND 1.500 ND 0.680 ND ND 0.160 0.130 0.220 ND 0.800 ND ND ND 0.420 0.42 J 4.33 NA NA NA NA ND NA 0.078 ND NA NA NA NA NA NA NA NA 0.0035 J NA J
09/14/04 ND ND 0.420 ND 0.210 ND ND 0.060 0.062 ND ND 0.380 ND ND ND 0.490 ND 1.622 NA NA NA NA ND NA 0.08 ND NA NA NA NA NA NA NA NA ND NA
12/13/04 ND ND 0.880 ND 0.510 0.0052 0.019 0.120 0.120 ND 0.011 0.770 ND ND ND 0.840 ND 3.2752 NA NA NA NA ND NA 0.079 ND NA NA NA NA NA NA NA NA ND NA
03/03/05 ND ND 0.990 ND 0.430 ND 0.035 0.087 0.066 0.140 ND 0.610 ND ND ND 0.490 ND 2.848 NA NA NA NA ND NA 0.072 ND NA NA NA NA NA NA NA NA ND NA
09/27/05 ND ND 2.400 ND 1.000 0.018 0.028 0.240 0.160 0.320 0.011 1.300 0.013 0.031 ND 1.300 ND 6.821 NA NA NA NA NA NA NA NA NA NA NA NA NA NA NA NA NA NA
03/02/06 ND ND 0.580 ND 0.400 ND 0.014 0.110 0.089 ND 0.012 0.920 ND ND ND 0.630 ND 2.755 NA NA NA NA NA NA NA NA NA NA NA NA NA NA NA NA NA NA
09/21/06 ND ND 0.680 ND 0.400 ND 0.017 0.110 0.130 ND 0.012 0.850 ND ND ND 0.710 ND 2.909 NA NA NA NA NA NA NA NA NA NA NA NA NA NA NA NA NA NA
DW-3 06/04/04 ND ND ND ND ND ND ND ND ND ND ND ND ND ND ND ND ND 0 NA NA NA NA 0.011 NA 1.2 0.0028 NA NA NA NA NA NA NA NA 0.076 NA
12/13/04 NS ND NS NS NS NS NS NS NS NS NS NS NS NS NS NS NS 0 NA NA NA NA NA NA NA NA NA NA NA NA NA NA NA NA NA NA
DW-4 06/04/04 ND ND ND ND ND ND ND ND ND ND ND ND ND ND ND 0.020 ND 0.02 NA NA NA NA ND NA 0.11 ND NA NA NA NA NA NA NA NA 0.0091 NA
09/14/04 ND ND ND ND ND ND ND ND ND ND ND ND ND ND ND 0.016 ND 0.016 NA NA NA NA ND NA 0.1 ND NA NA NA NA NA NA NA NA 0.0068 NA
12/14/04 ND ND ND ND ND ND ND ND ND ND ND ND ND ND ND 0.0044 ND 0.0044 NA NA NA NA ND NA 0.098 ND NA NA NA NA NA NA NA NA 0.0062 NA
03/03/05 ND ND ND ND ND ND ND ND ND ND ND ND ND ND ND ND ND 0 NA NA NA NA ND NA 0.13 ND NA NA NA NA NA NA NA NA 0.013 NA
09/28/05 ND ND ND ND ND ND ND ND ND ND ND ND ND ND ND 0.0062 ND 0.0062 NA NA NA NA NA NA NA NA NA NA NA NA NA NA NA NA NA NA
03/02/06 ND ND ND ND ND ND ND ND ND ND ND ND ND ND ND 0.0018 ND 0.0018 NA NA NA NA NA NA NA NA NA NA NA NA NA NA NA NA NA NA
09/21/06 ND ND ND ND ND ND ND ND ND ND ND ND ND ND ND 0.0010 ND 0.001 NA NA NA NA NA NA NA NA NA NA NA NA NA NA NA NA NA NA
DW-4 09/14/04 ND ND ND ND ND ND ND ND ND ND ND ND ND ND ND 0.011 ND 0.011 NA NA NA NA ND NA 0.094 ND NA NA NA NA NA NA NA NA 0.0075 NA
Duplicate
MW-1 06/04/04 ND ND 0.190 ND 0.290 0.011 0.013 0.013 0.020 ND 0.0085 0.078 ND 0.0075 0.002 0.140 ND 0.773 NA NA NA NA ND NA 0.2 ND NA NA NA NA NA NA NA NA 0.021 NA
09/10/04 ND ND 0.220 ND 0.400 0.019 0.012 0.012 0.033 ND 0.022 0.120 ND 0.012 ND 0.210 ND 1.06 NA NA NA NA ND NA 0.15 ND NA NA NA NA NA NA NA NA 0.0087 NA
12/13/04 ND ND 0.270 ND 0.240 0.01 0.015 0.016 0.019 ND 0.011 0.110 ND 0.02 ND 0.110 ND 0.821 NA NA NA NA ND NA 0.15 ND NA NA NA NA NA NA NA NA 0.015 NA
03/02/05 ND ND 0.080 ND 0.074 0.0038 0.018 0.0057 0.0044 ND 0.058 0.059 ND ND ND 0.052 ND 0.3549 NA NA NA NA ND NA 0.3 ND NA NA NA NA NA NA NA NA 0.04 NA
09/28/05 ND ND 0.600 ND 0.580 0.035 0.019 0.046 0.0518 ND 0.045 0.320 ND 0.034 0.0056 0.360 ND 2.0964 NA NA NA NA NA NA NA NA NA NA NA NA NA NA NA NA NA NA
03/02/06 ND ND 0.720 ND 0.310 0.013 0.016 0.034 0.0240 ND 0.0045 0.180 ND 0.061 0.0023 0.180 ND 1.5448 NA NA NA NA NA NA NA NA NA NA NA NA NA NA NA NA NA NA
09/21/06 ND ND 0.029 ND 0.016 ND ND 0.0011 0.0011 ND ND 0.0081 ND 0.0027 ND 0.0086 ND 0.0666 NA NA NA NA NA NA NA NA NA NA NA NA NA NA NA NA NA NA
07/28/11 ND ND 0.0725 ND 0.246 0.0035 0.0129 ND 0.0045 ND ND 0.0639 ND 0.002 0.0037 0.0231 ND 0.4321 NA NA NA NA NA NA NA NA NA NA NA NA NA NA NA NA NA NA
MW-1 09/10/04 ND ND 0.200 ND 0.350 0.018 0.013 0.012 0.032 ND 0.021 0.110 ND 0.012 ND 0.170 ND 0.938 NA NA NA NA ND NA 0.31 ND NA NA NA NA NA NA NA NA 0.058 NA
Duplicate
MW-2 06/04/04 ND ND 0.100 ND 0.053 ND ND 0.073 ND ND 0.01 1.100 ND 0.011 ND 0.066 ND 1.413 NA NA NA NA ND NA 0.13 ND NA NA NA NA NA NA NA NA 0.003 J NA J
09/13/04 ND ND ND ND 0.064 ND ND 0.082 ND ND ND 1.500 ND ND ND 0.077 ND 1.723 NA NA NA NA ND NA 0.13 ND NA NA NA NA NA NA NA NA ND NA
12/13/04 ND ND 0.110 ND 0.056 ND ND 0.042 ND ND ND 1.300 ND ND ND 0.061 ND 1.569 NA NA NA NA ND NA 0.12 ND NA NA NA NA NA NA NA NA ND NA
03/03/05 ND ND 0.170 ND 0.057 ND ND 0.090 ND ND ND 1.900 ND ND ND ND ND 2.217 NA NA NA NA ND NA 0.09 ND NA NA NA NA NA NA NA NA 0.017 NA
09/28/05 ND ND 0.110 ND 0.045 ND ND 0.050 ND ND ND 0.980 ND ND ND 0.088 ND 1.273 NA NA NA NA NA NA NA NA NA NA NA NA NA NA NA NA NA NA
03/02/06 ND ND 0.081 ND 0.053 ND ND 0.031 ND ND ND 1.500 ND ND ND 0.078 ND 1.743 NA NA NA NA NA NA NA NA NA NA NA NA NA NA NA NA NA NA
09/21/06 ND ND 0.070 ND 0.051 ND ND 0.029 ND ND ND 1.400 ND ND ND 0.110 ND 1.66 NA NA NA NA NA NA NA NA NA NA NA NA NA NA NA NA NA NA
07/28/11 ND ND 0.0025 ND 0.0081 ND ND 0.0128 ND ND ND 0.164 ND ND ND 0.0248 ND 0.2122 ND ND ND ND 0.0067 ND NA ND 0.0175 ND ND 0.785 0.0231 ND ND ND NA 0.0251
MW-3 06/04/04 ND ND 0.180 ND 0.310 ND ND 0.130 ND ND 0.095 0.670 ND ND ND 0.083 ND 1.468 NA NA NA NA ND NA 0.22 ND NA NA NA NA NA NA NA NA 0.008 NA
09/13/04 ND ND 0.110 ND 0.200 ND ND 0.140 ND ND 0.055 0.600 ND ND ND 0.063 ND 1.168 NA NA NA NA ND NA 0.48 ND NA NA NA NA NA NA NA NA 0.14 NA
12/13/04 ND ND 0.061 ND 0.140 ND 0.0071 0.110 ND ND 0.02 0.580 ND 0.0086 ND 0.045 ND 0.9717 NA NA NA NA ND NA 0.24 ND NA NA NA NA NA NA NA NA 0.027 NA
03/03/05 ND ND 0.060 ND 0.130 ND 0.019 0.130 ND ND 0.018 0.660 ND 0.010 ND 0.044 ND 1.071 NA NA NA NA ND NA 0.14 ND NA NA NA NA NA NA NA NA 0.015 NA
09/28/05 ND ND 0.120 ND 0.190 ND 0.0090 0.160 ND ND 0.046 0.760 ND ND ND 0.068 ND 1.353 NA NA NA NA NA NA NA NA NA NA NA NA NA NA NA NA NA NA
03/02/06 ND ND 0.024 ND 0.091 ND 0.0045 0.053 ND ND 0.0010 0.250 ND 0.0029 ND 0.026 ND 0.4524 NA NA NA NA NA NA NA NA NA NA NA NA NA NA NA NA NA NA
09/21/06 ND ND 0.026 ND 0.094 ND 0.0057 0.021 ND ND 0.011 0.220 ND ND ND 0.020 ND 0.3977 NA NA NA NA NA NA NA NA NA NA NA NA NA NA NA NA NA NA
07/28/11 ND ND ND ND 0.0036 ND ND 0.001 ND ND ND 0.0031 ND ND ND 0.0018 ND 0.0095 NA NA NA NA NA NA NA NA NA NA NA NA NA NA NA NA NA NA
MW-4 06/03/04 ND ND ND ND ND ND ND ND ND ND ND ND ND ND ND ND ND 0 NA NA NA NA ND NA 0.098 ND NA NA NA NA NA NA NA NA 0.011 NA
09/10/04 ND ND ND ND ND ND ND ND ND ND ND ND ND ND ND ND ND 0 NA NA NA NA ND NA 0.13 ND NA NA NA NA NA NA NA NA 0.013 NA
12/14/04 ND ND ND ND ND ND ND ND ND ND ND ND ND ND ND ND ND 0 NA NA NA NA ND NA 0.12 ND NA NA NA NA NA NA NA NA 0.013 NA
03/02/05 ND ND ND ND ND ND ND ND ND ND ND ND ND ND ND ND ND 0 NA NA NA NA ND NA 0.35 ND NA NA NA NA NA NA NA NA 0.044 NA
MW-5 06/03/04 ND ND ND ND ND ND ND ND ND ND ND ND ND ND ND ND ND 0 NA NA NA NA ND NA 0.14 ND NA NA NA NA NA NA NA NA 0.0095 NA
09/14/04 ND ND ND ND ND ND ND ND ND ND ND ND ND ND ND ND ND 0 NA NA NA NA ND NA 0.44 ND NA NA NA NA NA NA NA NA 0.048 NA
12/14/04 ND ND ND ND ND ND ND ND ND ND ND ND ND ND ND ND ND 0 NA NA NA NA ND NA 0.21 ND NA NA NA NA NA NA NA NA 0.015 NA
03/02/05 ND ND ND ND ND ND ND ND ND ND ND ND ND ND ND ND ND 0 NA NA NA NA ND NA 0.54 ND NA NA NA NA NA NA NA NA 0.14 NA
MW-6 06/04/04 ND ND ND ND ND ND ND ND ND ND ND ND ND ND ND ND ND 0 NA NA NA NA ND NA 0.11 ND NA NA NA NA NA NA NA NA 0.0089 NA
09/14/04 ND ND ND ND ND ND ND ND ND ND ND ND ND ND ND ND ND 0 NA NA NA NA ND NA 0.19 ND NA NA NA NA NA NA NA NA 0.02 NA
12/13/04 ND ND ND ND ND ND ND ND ND ND ND ND ND ND ND ND ND 0 NA NA NA NA ND NA 0.15 ND NA NA NA NA NA NA NA NA 0.012 NA
03/03/05 ND ND ND ND ND ND ND ND ND ND ND ND ND ND ND ND ND 0 NA NA NA NA ND NA 0.57 ND NA NA NA NA NA NA NA NA 0.085 NA
07/28/11 ND ND ND ND ND ND ND ND ND ND ND ND ND ND ND ND ND 0 ND ND ND ND 0.0054 ND NA ND ND ND ND 0.778 ND ND ND ND NA 0.037
MW-6 06/04/04 ND ND ND ND ND ND ND ND ND ND ND ND ND ND ND ND ND 0 NA NA NA NA ND NA 0.17 ND NA NA NA NA NA NA NA NA 0.015 NA
Duplicate
h/2004/1040082-04/oct/table 2 Page 3 of 4
Table 6
Groundwater Analytical Results (December 2015)
Aquair II Brownfields Site
13300 Sam Neely Road
Charlotte, Mecklenburg County, NC
Terracon Project No. 71157779
Sample ID:
Sample Date:
Volatlie Organic Compounds (EPA Method 8260)
1,1-Dichloroethene 7 <1.0 4.0 <1.0
Carbon tetrachloride 0.3 <1.0 57.2 <1.0
Chloroform 70 1.5 36.6 <1.0
cis-1,2-Dichloroethene 70 <1.0 1.8 4.0
Tetrachloroethene 0.7 69.1 37.7 <1.0
Trichloroethene 3 4.9 24.5 <1.0
Metals (EPA Methods 6010, 7470, and 7196)
Aluminum NS 2,350 11,100 <100
Antimony NS <5.0 <5.0 <5.0
Arsenic 10 <10.0 <10.0 <10.0
Barium 700 215 185 71.6
Beryllium NS <1.0 <1.0 <1.0
Boron 700 <50.0 <50.0 <50.0
Cadmium 2 <1.0 <1.0 <1.0
Calcium NS 35,400 27,700 31,400
Chromium, Total 10 <5.0 25.7 <5.0
Chromium, Hexavalent 10 <10.0 <10.0 <10.0
Cobalt NS <5.0 <5.0 <5.0
Copper 1,000 <5.0 7.10 <5.0
Iron 300 4,490 18,200 8,100
Lead 15 <5.0 <5.0 11.2
Magnesium NS 23,600 17,500 19,000
Manganese 50 210 176 69.8
Mercury 1,000 <0.20 <0.20 <0.20
Molybdenum NS <5.0 <5.0 <5.0
Nickel 100 <5.0 <5.0 <5.0
Potassium NS <5,000 <5,000 <5,000
Selenium 20 <10.0 <10.0 <10.0
Silicon NS 25,800 42,200 20,900
Silver 20 <5.0 <5.0 <5.0
Sodium NS 30,200 10,800 13,000
Strontium NS 447 369 292
Thallium NS <10.0 <10.0 <10.0
Tin NS <5.0 <5.0 <5.0
Titanium NS 169 591 <5.0
Vanadium NS 15.4 41.4 <5.0
Zinc 1,000 12.5 56.9 1,870
Notes:
Only detected compounds shown for VOCs, all analyzed compounds shown for metals.
Concentrations are reported in micrograms per liter (μg/L).
2L Standard - North Carolina Administrative Code Subchapter 2L Groundwater Standard, updated September 2015.
Bold indicates a concentration exceeding the laboratory reporting limit.
Gray shading indicates a concentration exceeding the 2L Standard.
NS - no standard
Analyte 2L Standard AMW-405MW-5 MW-9
12/22/15 12/22/15 12/22/15
Table 4
Air and Soil Vapor Sample Results (December 2015)
Aquair II Brownfields Site
13300 Sam Neely Road
Charlotte, Mecklenburg County, NC
Terracon Project No. 71157779
Sample ID:
Sample Date:
Type:
SGSL IASL SGSL IASL Location:
Volatile Organic Compounds (EPA Method TO-15)
1,2,4-Trimethylbenzene 48.7 1.460 613 6.13 <23 <15 <6.0 10 <1.0
2,2,4-Trimethylpentane NS NS NS NS <22 <14 <5.7 18 <5.0
4-Ethyltoluene NS NS NS NS <23 <15 <6.0 12 <1.0
Acetone 216,000 6,470 2,720,000 27,200 <110 <72 <29 <29 8.9
Benzene 120 0.360 1,570 1.57 <15 <9.6 <3.9 18 <0.68
Carbon Disulfide 4,870 146 61,300 613 <58 <37 <15 16 <3.3
Cyclohexane 41,700 1,250 526,000 5,260 <16 <10 <4.2 4.2 <0.74
Ethanol NS NS NS NS <35 <23 <9.3 <9.2 2.3
Ethylbenzene 374 1.12 4,910 4.91 <20 <13 <5.3 15 <0.93
Freon 11 (Trichlorofluoromethane)4,870 146 61,300 613 <26 <17 <6.9 <6.9 1.3
Freon 12 (Dichlorodifluoromethane)695 20.9 8,760 87.6 <23 <15 <6.1 <6.0 2.8
Heptane NS NS NS NS <19 <12 <5.0 95 <0.88
Hexane 4,870 146 61,300 613 <16 <11 <4.3 53 <0.75
m,p-Xylene 695 20.9 8,760 87.6 <20 <13 <5.3 67 <0.93
o-Xylene 695 20.9 8,760 87.6 <20 <13 <5.3 17 <0.93
Toluene 34,800 1,040 438,000 4,380 38 270 100 130 0.89
Helium NS NS NS NS 0.12%NA NA NA NA
Notes:
Concentrations are reported in micrograms per cubic meter (μg/m3) unless otherwise noted.
Only compounds that were detected in groundwater are shown.
ft ags - feet above ground surface
NA - not analyzed
NS - no standard
DWM - North Carolina Department of Environmental Quality, Division of Waste Management
IASL - DWM Indoor Air and Crawlspace Screening Concentration, updated September 2015
SGSL - DWM Sub-slab and Exterior Soil Gas Screening Level, updated September 2015
Concentrations highlighted in yellow exceed their respective residential SGSL or IASL (whichever is applicable).
Concentrations highlighted in orange exceed their respective non-residential SGSL or IASL (whichever is applicable).
A target carcinogenic risk of 1.0E-06 and target hazard quotient of 0.2 was assumed for the IASL (i.e., IASL(A) on DWM's screening levels table).
Other Compounds (QA/QC)
Analyte
OA-01
Outdoor Air
12/15/15
Site Entrance
Non-Residential
Soil Gas Soil Gas Soil Gas Soil Gas
IC Building IC Building IC Building Office Building
SV-03 SV-04
12/15/15 12/15/15 12/15/15 12/15/15Screening LevelsScreening Levels
Residential SV-01 SV-02

Appendix B DEQ Risk Calculator
Version Date:
Basis:
Site Name:
Site Address:
DEQ Section:
Site ID:
Exposure Unit ID:
Submittal Date:
Reviewed By:
5/18/2023
Prepared By:H&H
Worst-Case Soil Gas
AquAir II - West Side
13300 Sam Neely Road Charlotte, NC
Brownfields Redevelopment Section
18038-14-060
January 2023
November 2022 EPA RSL Table
North Carolina DEQ Risk Calculator
Complete Exposure Pathways
Version Date: January 2023
Basis: November 2022 EPA RSL Table
Site ID: 18038-14-060
Exposure Unit ID: Worst-Case Soil Gas
Note: Risk output will only be calculated for complete exposure pathways.
Receptor Pathway
Check box if
pathway
complete
Soil
Groundwater Use
Soil
Groundwater Use
Construction Worker Soil
Soil
Surface Water
Groundwater to Indoor Air
Soil Gas to Indoor Air
Indoor Air
Groundwater to Indoor Air
Soil Gas to Indoor Air
Indoor Air
Source Soil
Source Groundwater
Source Soil
Source Groundwater
Input Form 1A
VAPOR INTRUSION PATHWAYS
DIRECT CONTACT SOIL AND WATER PATHWAYS
Resident
Non-Residential Worker
Recreator/Trespasser
Resident
Non-Residential Worker
CONTAMINANT MIGRATION PATHWAYS
Groundwater
Surface Water
North Carolina DEQ Risk Calculator
Exposure Point Concentrations
Version Date: January 2023
Basis: November 2022 EPA RSL Table
Exposure Unit ID: Worst-Case Soil Gas
Description of Exposure Point Concentration Selection:
Exposure Point
Concentration
(ug/m3)
Notes:CAS Number Chemical
Minimum
Concentration
(Qualifier)
Maximum
Concentration
(Qualifier)
Units
Location of
Maximum
Concentration
Detection
Frequency
Range of
Detection
Limits
Concentration
Used for
Screening
Background
Value
Screening
Toxicity Value
(Screening
Level) (n/c)
Potential
ARAR/TBC
Value
Potential
ARAR/TBC
Source
COPC Flag
(Y/N)
Rationale for
Selection or
Deletion
170 67-64-1 Acetone
15 71-43-2 Benzene
7.2 75-15-0 Carbon Disulfide
0.53 56-23-5 Carbon Tetrachloride
0.23 67-66-3 Chloroform
1.4 74-87-3 Chloromethane
4.9 110-82-7 Cyclohexane
2.2 75-71-8 Dichlorodifluoromethane
5 78-87-5 Dichloropropane, 1,2-
31 100-41-4 Ethylbenzene
550 142-82-5 Heptane, N-
24 110-54-3 Hexane, N-
15 78-93-3 Methyl Ethyl Ketone (2-Butanone)
3.3 75-09-2 Methylene Chloride
520 115-07-1 Propylene
0.65 100-42-5 Styrene
20 127-18-4 Tetrachloroethylene
700 108-88-3 Toluene
0.64 76-13-1 Trichloro-1,2,2-trifluoroethane, 1,1,2-
2.7 75-69-4 Trichlorofluoromethane
15 95-63-6 Trimethylbenzene, 1,2,4-
2.1 108-67-8 Trimethylbenzene, 1,3,5-
130 108-38-3 Xylene, m-
39 95-47-6 Xylene, o-
Input Form 2D
Soil Gas Exposure Point Concentration Table
Note: Chemicals highlighted in orange are non-volatile chemicals. Since these chemicals do not pose a vapor intrusion risk, no risk values are calculated for these chemicals.
If the chemical list is changed from a prior calculator run, remember to select "See All Chemicals" on the data output sheet or newly added chemicals will not be included in risk calculations
North Carolina DEQ Risk Calculator
Risk for Individual Pathways Output Form 1A
Version Date: January 2023
Basis: November 2022 EPA RSL Table
Site ID: 18038-14-060
Exposure Unit ID: Worst-Case Soil Gas
Receptor Pathway Hazard Index Risk exceeded?
Soil NC NC NC
Groundwater Use*NC NC NC
Soil NC NC NC
Groundwater Use*NC NC NC
Construction Worker Soil NC NC NC
Soil NC NC NC
Surface Water*NC NC NC
Receptor Pathway Hazard Index Risk exceeded?
Groundwater to Indoor Air NC NC NC
Soil Gas to Indoor Air NC NC NC
Indoor Air NC NC NC
Groundwater to Indoor Air NC NC NC
Soil Gas to Indoor Air 1.8E-07 1.4E-02 NO
Indoor Air NC NC NC
Pathway Source
Source Soil NC
Source Groundwater NC
Source Soil NC
Source Groundwater NC
DIRECT CONTACT SOIL AND WATER CALCULATORS
Resident
Non-Residential Worker
Recreator/Trespasser
NC 2B Standards, appropriate remediation and/or institutional control measures will be necessary to be eligible for a risk-based
Surface Water
VAPOR INTRUSION CALCULATORS
Resident
Non-Residential Worker
CONTAMINANT MIGRATION CALCULATORS
Target Receptor Concentrations Exceeded?
Groundwater
1. If lead concentrations were entered in the exposure point concentration tables, see the individual calculator sheets for lead
concentrations in comparison to screening levels. Note that lead is not included in cumulative risk calculations.
North Carolina DEQ Risk Calculator
DEQ Risk Calculator - Vapor Intrusion - Non-Residential Worker Soil Gas to Indoor Air
Version Date: January 2023
Basis: November 2022 EPA RSL Table
Site ID: 18038-14-060
Exposure Unit ID: Worst-Case Soil Gas
CAS #Chemical Name:
Soil Gas
Concentration
(ug/m3)
Calculated
Indoor Air
Concentration
(ug/m3)
Target Indoor
Air Conc. for
Carcinogens @
TCR = 1E-06
Conc. for Non-
Carcinogens @
THQ = 0.2
Calculated
Risk
Calculated
Non-
Carcinogenic
Hazard
Quotient
67-64-1
71-43-2
75-15-0
56-23-5
67-66-3
74-87-3
110-82-7
75-71-8
78-87-5
100-41-4
142-82-5 Heptane, N-550 5.5 -3.5E+02 3.1E-03
110-54-3
78-93-3
75-09-2
115-07-1
100-42-5
127-18-4 Tetrachloroethylene 20 0.2 4.7E+01 3.5E+01 4.2E-09 1.1E-03
108-88-3 Toluene 700 7 -4.4E+03 3.2E-04
76-13-1
75-69-4
95-63-6
108-67-8
108-38-3
95-47-6
Cumulative:1.8E-07 1.4E-02
Output Form 3E
risk, no risk values are calculated for these chemicals.
North Carolina DEQ Risk Calculator