25008_North Hills Expansion_BAR_20210623

SOIL GAS ASSESSMENT REPORT
FORMER JC PENNEY’S AT NORTH HILLS LASSITER MILL ROAD
RALEIGH, NORTH CAROLINA BROWFIELDS PROJECT NUMBER: 25008-21-092

Prepared For:

North Hills Owner, LP
4321 Lassiter at North Hills Ave Suite 250
Raleigh, NC 27609

Prepared By:
Mid-Atlantic Associates, Inc. 409 Rogers View Court
Raleigh, North Carolina 27610 Mid-Atlantic Job No. R3746.02
June 23, 2021

TABLE OF CONTENTS
1.0 GENERAL INFORMATION.................................................................................... 1
1.1 Introduction ................................................................................................... 1 1.2 Laboratory .................................................................................................... 1 1.3 Driller ............................................................................................................ 1
2.0 SUMMARY OF FIELD ACTIVITIES ....................................................................... 2
2.1 Sub-Slab Soil Gas Sample Collection .......................................................... 2 2.2 Vapor Implant Installation Procedures .......................................................... 2
2.3 Exterior Soil Gas Sample Collection ............................................................. 2 2.4 Helium Leak Check Procedures ................................................................... 3 2.5 Sample Collection Procedures ..................................................................... 4
3.0 LABORATORY ANALYTICAL RESULTS AND RISK EVALUATION .................. 4
3.1 Laboratory Analytical Results ....................................................................... 4 3.2 Risk Evaluation ............................................................................................. 5
4.0 SUMMARY AND CONCLUSIONS ......................................................................... 6
DRAWINGS Drawing 1 Topographic Site Map
Drawing 2 Sample Location Map TABLES
Table 1 Summary of Chemical Constituents Detected in Soil Gas and Risk Calculations
Table 2 Soil Gas Sample/Sample Duplicate Comparison: “SG-2” and “Dup-1” APPENDICES
Appendix A Boring Logs Appendix B Laboratory Analytical Report and Chain of Custody Record
Appendix C Precision Evaluation Methods Appendix D DEQ Risk Summary Sheets

1.0 GENERAL INFORMATION
1.1 Introduction
The 8.63-acre subject site is part of North Hills, a large mixed-use development in Raleigh at the intersection of the I-440 Beltline and Six Forks Road (Drawing 1). The subject site is
occupied by a vacant JC Penney department store and adjacent parking lots and decks. The subject site is undergoing large-scale redevelopment and is enrolled as a DEQ-
designated Brownfield Property (BPN# 25008-21-092).
Groundwater and soil gas beneath the subject site is contaminated with dry cleaning solvents from a former Brothers Cleaners laundry, which was located to the northwest, and
petroleum contamination from the abutting Exxon gas station. Brothers Cleaners currently operates a dry cleaner in North Hills; however, this is not to be confused with their former
facility which was demolished in 2003.
This assessment included sub-slab and exterior soil gas testing to provide ‘baseline’ data related to the potential for vapor intrusion (VI) and to help direct the design of VI mitigation
measures. This assessment was conducted in accordance with DEQ guidelines and the
April 27, 2021 Sub-Slab Soil Gas Assessment Work Plan (Work Plan), which was submitted
to DEQ and detailed the collection of four sub-slab soil gas points within the former JC Penney’s and underneath an existing parking deck. The Work Plan also included the
collection of three exterior soil gas samples in an area where redevelopment will involve cuts greater than 20 feet below land surface and at locations where elevators will be
constructed. On April 27, 2021, DEQ approved the Work Plan.
1.2 Laboratory
Enthalpy Analytical, LLC 800-1 Capitola Drive
Durham, North Carolina [phone]
Contact: Mr. David Myers
1.3 Driller
Regional Probing Services PO Box 1161
Wake Forest, North Carolina 27588 [phone]
Driller's Registration Number: 3322 Contact: Larry Opper

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2.0 SUMMARY OF FIELD ACTIVITIES

On May 19, 2021, Mid-Atlantic mobilized to the site to install four sub-slab soil gas sampling points (SG-1 through SG-4) and oversee the installation of three exterior soil gas sampling
points (SG-5 through SG-7). Mid-Atlantic collected a total of 8 samples, consisting of five sub-slab soil gas samples (which includes a duplicate of SG-2) and three exterior soil gas
samples.
2.1 Sub-Slab Soil Gas Sample Collection
On May 19, 2021, we installed four interior sub-slab soil gas sampling points (SG-1 through
SG-4). Sub-slab soil gas sample locations were adjusted in the field to avoid vehicular traffic and demolition activities. The NCDEQ preferred that the vapor sampling probes for SG-2 and
SG-3 be installed in areas paved by concrete and not asphalt, because asphalt contains petroleum and sampling under asphalt can result in biased test results. Because the originally
proposed sample locations for SG-2 and SG-3 were in an area paved by asphalt, the sample locations were moved approximately 65-70 feet to the northwest. The approximate sub-slab
soil gas sample locations are shown on Drawing 2 and described below:
Sample Location
SG-1 Inside the former JC Penney’s
SG-2 Under the parking deck south adjacent of the former JC Penney’s
SG-3 Under the parking deck south adjacent of the former JC Penney’s
SG-4 Inside the former JC Penney’s

2.2 Vapor Implant Installation Procedures
Two sub-slab sampling ports (SG-1 and SG-4) were drilled in the footprint of the former JC Penney’s and two (SG-2 and SG-3) were drilled under the adjacent parking deck to support
the installation of vapor pins and collection of sub-slab soil gas samples at these locations. To create a sub-slab sampling port, a rotary-impact drill equipped with a decontaminated spline
drill bit was utilized to drill a 5/8-inch diameter hole through the concrete slab. The concrete slab was approximately 8 to 12 inches thick. Mid-Atlantic observed what appeared to be soil
after puncturing through the concrete slab at sub-slab sampling locations. Upon completion, a vapor sampling probe was established using a new “Vapor Pin™” which utilizes a brass barb
fitting with a silicone sleeve to create a seal with the concrete when inserted using an installation/extraction tool. The vapor pin was then fitted with ¼-inch outer diameter Teflon-
lined tubing to complete the vapor sampling probe assembly.
2.3 Exterior Soil Gas Sample Collection

A total of three exterior soil gas sample points (SG-5, SG-6, and SG-7) were installed during the sampling event. Boring services and construction of the exterior soil gas sample points
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were provided by Regional Probing Services, Inc. of Wake Forest, North Carolina. The
exterior soil gas borings were advanced using a Geoprobe 5410® and direct-push technology (DPT) to a depth of approximately 20 feet below land surface (BLS). The borings
were filled with sand to approximately 19.5 feet BLS and a gas vapor implant (approximately 6” long with a stainless-steel screen) fitted with ¼-inch outer diameter Teflon-lined tubing was
inserted into the boring. The boring was then filled with a foot of sand (which surrounded the implant) and the remainder was backfilled using hydrated bentonite to land surface.
Continuous soil samples were collected using a Geoprobe macrocore sampling device and
characterized for lithology. Evidence of petroleum and/or chlorinated solvent impacts to soil were not observed, except for a faint petroleum odor observed in boring SG-5 from
approximately 19-19.5 ft BLS. Boring logs are provided in Appendix A.
Adjustments to the locations of exterior soil gas samples outlined in the Work Plan were made in the field due to the presence of multiple utilities associated with the North Hills
development and to avoid vehicular traffic. Information regarding the location of the soil gas points is described in the table below:

Sample Location
SG-5 Landscaped area approximately 35 feet southwest of the Ruth’s Chris Steakhouse north adjacent to the subject site.
SG-6 A paved portion of the northern section of the former JC Penney’s
parking lot.
SG-7 In a landscaped area adjacent to the parking lot of the former JC Penney’s.

2.4 Helium Leak Check Procedures
Upon completion of sample point construction activities, the points were purged, and a leak check was performed at each probe location using a plastic shroud, helium gas, and a
portable helium gas detector. A plastic shroud was placed over the entire sampling train of each soil gas sampling location. Helium was released into the shroud via tubing from the
cylinder into the shroud, and a grab sample was collected by filling a Tedlar bag using the exhaust port of the purge syringe. Helium was detected within the Tedlar bag at de minimis
concentrations compared to DEQ’s acceptable guideline of ten percent of the helium concentration under the plastic shroud at the sampling locations. As such, leaks were not
detected prior to soil gas sample collection. The results of Mid-Atlantic’s helium leak checks are as follows:

Sample ID Helium Concentration Under Shroud Helium Concentration in Tedlar Bag
SG-1 24.4% 300 ppm
SG-2 20.7% 875 ppm
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Duplicate-1 20.7% 0 ppm
SG-3 20.9% 100 ppm
SG-4 28.0% 0 ppm
SG-5 43.1% 0 ppm
SG-6 22.3% 1625 ppm
SG-7 25.3% 0 ppm
Note: 1 % = 10,000 PPM 2.5 Sample Collection Procedures
At each sample location, a soil gas sample was collected using a 1-liter stainless steel
canister at a maximum flow rate of 200 milliliters per minute (ml/min) after performing the helium leak check. Four sub-slab soil gas samples were collected and a duplicate sample
(Dup-1) was collected from sample location SG-2, located underneath the parking deck adjacent to the JC Penney’s. Upon collection, the soil gas samples were sent to Enthalpy
Analytical (Enthalpy) in Durham under proper chain of custody for analysis for volatile organic compounds (VOCs) according to EPA Method TO-15.

3.0 LABORATORY ANALYTICAL RESULTS AND RISK EVALUATION
3.1 Laboratory Analytical Results
The laboratory analytical report and chain-of-custody record for the soil gas samples are provided in Appendix B and summarized in Table 1. The soil gas analytical results were
initially compared to the Division of Waste Management (DWM) Soil Gas Screening Levels (SGSLs) January 2021 Table. As summarized in Table 1, multiple soil gas constituents were
detected at concentrations above their respective Residential and/or Non-Residential SGSLs. Former JC Penney’s
Sub-slab soil gas samples SG-1 and SG-4 did not exhibit soil gas constituents at concentrations that exceed their respective Non-Residential SGSLs. Soil gas constituents
detected above Residential SGSLs include chloroform in SG-1 and tetrachloroethylene (PCE) in SG-4.
Parking Deck
Tetrachloroethylene was detected above its Residential and Non-Residential SGSLs in sub-
slab soil gas samples SG-2/Dup-1 and SG-3. Soil gas constituents detected above their respective Residential SGSLs but below Non-Residential SGSLs include trichloroethylene
(TCE) in SG-2/Dup-1 and chloroform in SG-2/Dup-1 and SG-3.
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Parking Lot
Exterior soil gas sample SG-6 exhibited 1,3-butadiene at a concentration that exceeded its Residential and Non-Residential SGSLs. Benzene, chloroform, and/or 1,3-butadiene were
detected at concentrations above their respective Residential SGSLs (but below Non-Residential SGSLs) in soil gas samples SG-5, SG-6, and/or SG-7.
The laboratory method detection limits (MDLs) for 1,2-dibromoethane (ranging from 0.743 to
0.822 ug/m3) were above its Residential SGSL (0.16 ug/m3) but below its Non-Residential SGSL. As such, we have included a 1,2-dibromoethane concentration equal to its MDL in each
respective sample in our risk evaluations. Other compounds were detected above the laboratory method detection limit but below the Residential and Non-Residential SGSLs in the
soil gas samples.
Mid-Atlantic evaluated the reproducibility of the sample results by the comparison of soil gas constituents detected in SG-2 and its duplicate. The methodology for the evaluation is included
in Appendix C. As summarized in Table 2, calculations of variability were performed for the 27 soil gas constituents detected in SG-2 and Dup-1. Eighteen soil gas constituents exhibited
acceptable variability, five were slightly high, and four exhibited high variability. These results indicate an acceptable amount of variability for most soil gas constituents.
3.2 Risk Evaluation
The cumulative risk is calculated by entering the maximum concentrations of all contaminants
detected at each established exposure unit (EU) into the DEQ Risk Calculator. An EU is a defined area of a site represented by a specific set of land use(s), receptors, contaminant
concentrations, and exposure pathways.1 The subject site is separated in to seven EUs. Information regarding the specific EUs is described in the table below:

Exposure Unit/ Sample(s) Location
SG-1 Inside the Former JC Penney’s
SG-2/Dup-1 Under the Parking Deck
SG-3 Under the Parking Deck
SG-4 Inside the Former JC Penney’s
SG-5 Parking Lot
SG-6 Parking Lot
SG-7 Parking Lot
The DEQ Risk Calculator determines the cancer risk sum for all carcinogens and the
cumulative hazard index for all non-carcinogens. The DWM allows a maximum cancer risk

1 NCDEQ Technical Guidance for Risk-Based Environmental Remediation of Sites. March 2017.
Page 40
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sum for all carcinogens of 1.0E-04 and a maximum cumulative hazard index (HI) of 1.0 for all
non-carcinogens in soil gas. The HI is the sum of the hazard quotient (HQs) calculated for each compound detected. The NCDEQ risk calculations for the subject site are included in
Appendix D.
Risk calculations were performed for all soil gas samples collected as part of this assessment (for SG-2/Dup-1, the highest concentrations detected between the two samples were entered
into the risk calculator). As summarized in Table 1, the non-carcinogenic hazard index was exceeded in samples SG-2/Dup-1 (9.6), SG-3 (3.7), SG-4 (1.3), and SG-6 (1.0) under a
residential-use scenario due primarily to PCE. Risk calculations for SG-1, SG-5, and SG-7 did not suggest unacceptable exposure under Residential or Non-Residential use scenarios. None
of the samples exhibited soil gas constituents at concentrations that resulted in an exceedance of the cancer risk sum target value of 1.0E-04 under Residential or Non-Residential use
scenarios.
4.0 SUMMARY AND CONCLUSIONS
The May 2021 Soil Gas Assessment activities are summarized as follows:

• A total of four interior sub-slab soil gas samples (and a duplicate) were collected
beneath the former JC Penney’s and adjacent parking deck.
• Three exterior soil gas samples were collected in the parking lot adjacent to the former
JC Penney’s.
The source of chlorinated solvents, including PCE, is the former Brothers Cleaners that was located northwest of the subject site. The greatest concentrations of PCE were exhibited in
SG-2/Dup-1 and SG-3, located furthest away from the former Bothers Cleaners downgradient to the southeast. Samples SG-5, SG-6, and SG-7, located closer to Brothers
Cleaners, did not exhibit PCE at concentrations that exceed its Residential/Non-Residential SGSLs. This could be explained by the underlying PCE groundwater plume caused by the
Brothers Cleaners moving to the southeast.
The overall objective of this investigation was to gather ‘baseline’ data related to the potential for vapor intrusion issues to help facilitate future development, direct the VIMS
design, and determine if potentially unacceptable VI risks might be present at areas that will undergo redevelopment.
Based on the data collected we conclude that the soil gas and sub-slab concentrations of
VOCs could result in unacceptable exposure risk under a Residential exposure scenario in the proposed redevelopment, but not under a Non-Residential Scenario. It is important to note
that areas with ground-floor occupancy are being designed to include a vapor barrier and do not include residential uses.
DRAWINGS
´
TOPOGRAPHIC SITE MAPJC PENNY NORTH HILLS REDEVELOPMENTLASSITER MILL ROADRALEIGH, NORTH CAROLINA
DRAWN BY:DATE:
ENG. CHECK:
JOB NO:
APPROVAL:
DRAFTCHECK:GIS NO:
DWG NO:
REFERENCES:
SCALE:
JUNE 2021
000R3746.02
3G-R3746.02-11
1. RALEIGH WEST, NC DIGITAL RASTER GRAPHICS, USGS. SCANNED FROM 1:24,000-SCALE WAKE, NC TOPOGRAPHIC MAPS, PUBLISHED 2019, USGS.2. INSET MAP DIGITAL DATA FROM 2002 NATIONAL TRANSPORTATION ATLAS, BUREAU OF TRANSPORTATION STATISTICS, WASHINGTON, D.C.3. PROPERTY BOUNDARY DATA FROM WAKE COUNTY GIS.
CONTOUR INTERVAL = 10 FEET
0 600 1,200Feet
SITE
1:12,000
KRC§¨¦I440§¨¦U70 §¨¦I40
§¨¦U64
WAKE
AREA SHOWNWITHIN WAKE COUNTY
DHN
DHNDHN
#*
#*
#*
#*
!(
!(
!(
SG-7
SG-6
SG-5
Lassiter Mill RoadRockingham StreetSG-1
SG-3
SG-2
SG-4West-CentralElevator
North Elevator Pit
North Elevatorsand Lobby
Elevators and Lobby
BuildingY Area
Central Elevator
NCCGIA, NC911 Board
´
DRAWN BY:
DRAFT CHECK BY:
ENGINEER CHECK BY:
APPROVED BY:
SAMPLE LOCATION MAPJC PENNY NORTH HILLS REDEVELOPMENTLASSITER MILL ROADRALEIGH, NORTH CAROLINA
REFERENCE: DATA FROM WAKE COUNTY GIS, NC ONEMAP, NCDOT.
DATE: JUNE 2021
JOB NO.: R3746.02
GIS NO.: 3G-R3746.02-2
DRAWING NO.: 2
Legend
!(Exterior Soil Gas Sample Location
#*Interior Soil Gas Sample Location
Elevator Locations
Subject Property
Parcel Boundaries
1:1,200
0 100 200 Feet
DHN
DHN
DHN
KRC
TABLES
Sampling Date 5/19/2021 5/19/2021 5/19/2021 5/19/2021 5/19/2021 5/19/2021 5/19/2021 5/19/2021
1,2,4-Trichlorobenzene 0.880 <0.755 <0.739 <0.766 <0.698 <0.770 <0.742 <0.773 14 8800
1,2,4-Trimethylbenzene 5.57 m 5.07 m 4.08 m 3.13 m 2.93 m 3.46 m 18.8 m 4.48 m 420 5300
1,2-Dibromoethane 0.708* 0.802* 0.786* 0.815* 0.743* 0.819* 0.789* 0.822*
1,2-Dichlorobenzene 0.608 <0.622 <0.609 <0.631 <0.575 <0.635 <0.611 <0.637 1400 18000
1,2-Dichloropropane <0.462 <0.475 <0.466 <0.482 <0.440 0.791 <0.467 1.15 m 25 330
1,3,5-Trimethylbenzene 1.72 1.11 0.807 m 0.646 0.738 1.68 m 7.03 m 1.25 420 5300
1,3-Butadiene 0.319 m 0.353 m <0.215 0.260 0.232 2.97 49.6 9.54 3.1 41
1,3-Dichlorobenzene 2.09 0.963 0.842 1.05 <0.577 1.36 1.69 3.91 NE NE
1,4-Dichlorobenzene 0.605 <0.617 <0.604 <0.626 <0.571 <0.630 <0.606 <0.632 8.5 110
1,4-Dioxane 0.852 0.707 0.550 1.34 1.38 <0.377 <0.363 <0.378 19
2-Hexanone (Methyl butyl
ketone)0.991 m 1.77 m 1.71 m 3.05 0.611 m 2.29 1.21 m 3.01 210 2600
4-Ethyltoluene 1.60 m 1.35 1.08 1.01 0.72 0.98 5.79 m 1.22 NE NE
Acetone 62.5 77.2 59.2 m 85.6 46.8 37.9 41.1 30.8 220000
Benzene 0.931 0.719 0.494 1.41 0.47 3.69 17.6 4.46
Carbon disulfide 0.643 0.979 0.592 0.643 0.34 2.31 21.4 0.902 4900
Carbon tetrachloride 0.852 m <0.647 <0.634 <0.657 <0.599 <0.660 <0.636 <0.662 16 200
Vinyl chloride 0.341 <0.261 <0.255 <0.265 <0.241 <0.266 0.494 <0.267 5.6 280
Chloroform 5.13 23.4 25.6 5.30 <0.463 4.29 1.95 6.06 4.1 53
Chloromethane 0.324 <0.208 <0.204 0.259 m <0.193 1.90 2.10 0.465 m 630 7900
cis-1,2-Dichloroethylene 0.760 0.961 0.870 <0.415 <0.378 <0.417 <0.402 <0.419 NE NE
Cyclohexane 5.05 0.809 <0.353 1.83 1.27 m 4.25 49.8 3.49 m 42000 530000
Ethanol 161 83.5 51 126 108 19.9 20.9 29.4 NE NE
Ethyl acetate 2.55 2.29 1.05 m 0.975 m 1.49 97.1 36.3 9.18 490 6100
Ethylbenzene 1.86 1.52 1.01 1.63 0.82 2.22 16.6 2.42 37 490
Trichlorofluoromethane (Freon 11)5.45 2.25 2.40 1.86 3.19 0.997 1.14 1.02 NE NE
1,1,2-Trichloro-1,2,2-trifluoroethane (Freon 113)1.11 <0.794 <0.778 <0.806 <0.735 <0.811 <0.780 <0.813 35000 440000
Freon 114 (C2Cl2F4)<0.695 <0.715 <0.701 <0.726 <0.662 1.19 <0.703 <0.732 NE NE
Dichlorodifluoromethane (Freon 12)3.70 1.94 2.33 1.99 3.64 1.58 0.961 1.64 700 8800
Heptane 8.17 2.47 1.36 5.59 4.28 2.89 46.4 2.44 2800 35000
Hexachlorobutadiene 1.22 <1.08 <1.05 <1.09 <0.996 <1.10 <1.06 <1.10 4.3 56
Hexane 1.56 0.571 m <0.358 7.84 0.479 3.57 71.8 3.43 4900 61000
Isopropyl alcohol 11.5 6.74 4.85 9.61 12.3 13.0 12.2 11.8 1400 18000
Methyl ethyl ketone (2-Butanone) 2.46 9.36 6.98 14.1 2.21 7.39 11.6 6.91 35000 440000
Methyl isobutyl ketone 1.58 1.61 1.01 2.23 0.909 39.7 27.9 36.5 21000 260000
Methyl tert-butyl ether <0.368 <0.378 <0.371 <0.384 <0.350 0.811 <0.372 0.619 360 4700
Methylene chloride 1.51 <0.908 <0.890 <0.922 <0.840 0.986 3.93 <0.929 3400 53000
Naphthalene 1.07 0.736 0.542 <0.547 <0.499 0.672 0.547 0.750 2.8 36
Propylene <0.165 3.18 m 1.63 8.84 m 13.0 26.1 2,388 64.1 21000 260000
Styrene 0.704 <0.426 <0.418 <0.433 0.735 0.977 2.12 1.24 7000 88000
Tetrachloroethylene 141 11,395 12,514 4,903 1,806 60.7 66.2 162 280 3500
Tetrahydrofuran 0.581 0.325 <0.299 <0.309 <0.282 1.41 3.19 0.823 14000 180000
Toluene 5.18 3.73 2.14 6.05 2.26 11.9 77.6 9.41 35000 440000
trans-1,2-Dichloroethylene <0.401 0.596 0.608 <0.419 <0.382 <0.422 <0.406 <0.423 280 3500
Trichloroethylene 0.688 34.1 36.8 7.43 1.65 0.715 8.92 <0.568 14 180
Vinyl acetate <0.357 <0.368 <0.360 <0.373 <0.340 2.30 <0.361 <0.376 1400 18000
Total Xylenes 9.29 8.86 5.98 7.80 4.53 10.6 82.7 10.8 700 8800
Calculated Sample Sum Cancer
Risk 7.8E-06 2.1E-05 1.0E-05 8.1E-06 2.4E-05 1.1E-05
Calculated Sample Non-Carcinogenic Hazard Index 1.6E-01 3.7E+00 1.3E+00 1.7E-01 1.0E+00 2.9E-01
Calculated Sample Sum Cancer
Risk 5.9E-07 1.6E-06 7.7E-07 6.2E-07 1.8E-06 8.4E-07
Calculated Sample Non-
Carcinogenic Hazard Index 1.1E-02 2.9E-01 1.1E-01 1.3E-02 7.9E-02 2.3E-02
Notes:Concentration units; ug/m3 J = Estimated Concentration
NE = Not Established* = 1,2-Dibromoethane was not detected, but had a lab method detection limit over the Residential SGSL. For the purpose of risk evaluation, concentrations of 1,2-Dibromoethane equal to its MDL were assumed
Bolded concentrations exceed the Residential Soil Gas Screening Level
Shaded concentrations exceed the Industrial/Commercial Soil Gas Screening Level
<0.34 = Not detected above the lab method detection limitm = Manual integration by laboratory personnel
3.7E-06
7.6E-01
SG-3
DUP-1
(Duplicate of
SG-2)
SG-7
4.9E-05
9.6E+00
SG-4
TABLE 1
SUMMARY OF CHEMICAL CONSTITUENTS DETECTED IN SOIL GAS AND RISK CALCULATIONS
FORMER JC PENNEY'S AT NORTH HILLS
LASSITER MILL ROADRALEIGH, NORTH CAROLINA
MID-ATLANTIC JOB NO. R3746.02
NON-RESIDENTIAL RISK CALCULATIONS SUMMARY Acceptable Carcinogenic
Sum Risk Range and Maximum Non-Cancer Hazard Index
1.0 E-04
HI=1
RESIDENTIAL RISK CALCULATIONS SUMMARY Acceptable Carcinogenic
Sum Risk Range and Maximum Non-Cancer Hazard Index
1.0 E-04
HI=1
Sample ID SG-1 SG-2 SG-6SG-5 NCDEQ DWM Residential Soil GasScreening Levels January 2021 (ug/m3)
NCDEQ DWM Non-Residential Soil GasScreening Levels January 2021 (ug/m3)

2700000
ParameterMethod Units Result Qualif RLParameterMethod Units Result Qualif RL1,2,4-TrichlorobenzeneTO-15ug/m3<0.755 ND0.755 1,2,4-TrichlorobenzeneTO-15ug/m3<0.739 ND0.7391,2,4-TrimethylbenzeneTO-15ug/m35.07 m0.502 1,2,4-TrimethylbenzeneTO-15ug/m34.08 m0.492%RPD4.6 0.99 21.61,2-DichlorobenzeneTO-15ug/m3<0.622 ND0.622 1,2-DichlorobenzeneTO-15ug/m3<0.609 ND0.6091,2-DichloropropaneTO-15ug/m3<0.475 ND0.475 1,2-DichloropropaneTO-15ug/m3<0.466 ND0.4661,3,5-TrimethylbenzeneTO-15ug/m31.110.509 1,3,5-TrimethylbenzeneTO-15ug/m30.807 m0.499ABS0.3031,3-ButadieneTO-15ug/m30.353 m0.220 1,3-ButadieneTO-15ug/m3<0.215 ND0.2151,3-DichlorobenzeneTO-15ug/m30.9630.624 1,3-DichlorobenzeneTO-15ug/m3 0.8420.611ABS0.1211,4-DichlorobenzeneTO-15ug/m3<0.617 ND0.617 1,4-DichlorobenzeneTO-15ug/m3 <0.604 ND0.6041,4-DioxaneTO-15ug/m30.7070.369 1,4-DioxaneTO-15ug/m3 0.5500.362ABS0.1572-Hexanone (Methyl butyl ketone)TO-15ug/m31.77 m0.428 2-Hexanone (Methyl butyl ketone)TO-15ug/m3 1.71 m0.419ABS0.064-EthyltolueneTO-15ug/m31.350.510 4-EthyltolueneTO-15ug/m3 1.080.500ABS0.27AcetoneTO-15ug/m377.20.243AcetoneTO-15ug/m3 59.2 m0.238%RPD68.2 18.0 26.4BenzeneTO-15ug/m30.7190.328 BenzeneTO-15ug/m3 0.4940.322ABS0.225Carbon disulfideTO-15ug/m30.9790.317 Carbon disulfideTO-15ug/m3 0.5920.311ABS0.387Carbon tetrachlorideTO-15ug/m3<0.647 ND0.647 Carbon tetrachlorideTO-15ug/m3 <0.634 ND0.634Vinyl chlorideTO-15ug/m3<0.261 ND0.261 Vinyl chlorideTO-15ug/m3 <0.255 ND0.255ChloroformTO-15ug/m323.40.500 ChloroformTO-15ug/m3 25.60.490%RPD24.5 2.20 9.0ChloromethaneTO-15ug/m3<0.208 ND0.208 ChloromethaneTO-15ug/m3 <0.204 ND0.204cis-1,2-DichloroethyleneTO-15ug/m30.9610.409 cis-1,2-DichloroethyleneTO-15ug/m3 0.8700.401ABS0.091CyclohexaneTO-15ug/m30.8090.360 CyclohexaneTO-15ug/m3 <0.353 ND0.353EthanolTO-15ug/m383.50.191 EthanolTO-15ug/m3 510.187%RPD67.3 32.5 48.3Ethyl acetateTO-15ug/m32.290.367 Ethyl acetateTO-15ug/m3 1.05 m0.360%RPD1.7 1.24 74.3EthylbenzeneTO-15ug/m31.520.440 EthylbenzeneTO-15ug/m3 1.010.431ABS0.51Trichlorofluoromethane (Freon 11)TO-15ug/m32.250.605 Trichlorofluoromethane (Freon 11)TO-15ug/m3 2.40.593ABS0.151,1,2-Trichloro-1,2,2-trifluoroethane (Freon 113)TO-15ug/m3<0.794 ND 0.7941,1,2-Trichloro-1,2,2-trifluoroethane (Freon 113)TO-15 ug/m3 <0.778 ND 0.778Freon 114 (C2Cl2F4)TO-15ug/m3<0.715 ND0.715 Freon 114 (C2Cl2F4)TO-15ug/m3 <0.701 ND0.701Dichlorodifluoromethane (Freon 12)TO-15ug/m31.940.494 Dichlorodifluoromethane (Freon 12)TO-15ug/m3 2.330.484ABS0.39HeptaneTO-15ug/m32.470.424 HeptaneTO-15ug/m3 1.360.415%RPD1.9 1.11 58.0HexachlorobutadieneTO-15ug/m3<1.08 ND1.080 HexachlorobutadieneTO-15ug/m3 <1.05 ND1.05HexaneTO-15ug/m30.571 m0.366 HexaneTO-15ug/m3 <0.358 ND0.358Isopropyl alcoholTO-15ug/m36.740.250 Isopropyl alcoholTO-15ug/m3 4.850.245%RPD5.8 1.89 32.6Methyl ethyl ketone (2-Butanone)TO-15ug/m39.360.311 Methyl ethyl ketone (2-Butanone)TO-15ug/m3 6.980.305%RPD8.2 2.38 29.1Methyl isobutyl ketoneTO-15ug/m31.610.434 Methyl isobutyl ketoneTO-15ug/m3 1.010.426ABS0.60Methyl tert-butyl etherTO-15ug/m3<0.378 ND0.378 Methyl tert-butyl etherTO-15ug/m3 <0.371 ND0.371Methylene chlorideTO-15ug/m3<0.908 ND0.908 Methylene chlorideTO-15ug/m3 <0.890 ND0.89NaphthaleneTO-15ug/m30.7360.539 NaphthaleneTO-15ug/m3 0.5420.528ABS0.194PropyleneTO-15ug/m33.18 m0.170 PropyleneTO-15ug/m31.630.166%RPD2.4 1.55 64.4StyreneTO-15ug/m3<0.426 ND0.426 StyreneTO-15ug/m3<0.418 ND0.418TetrachloroethyleneTO-15ug/m31139517.7 TetrachloroethyleneTO-15ug/m31251417.4%RPD11954.5 1119 9.4TetrahydrofuranTO-15ug/m30.3250.305 TetrahydrofuranTO-15ug/m3<0.299 ND0.299TolueneTO-15ug/m33.730.392 TolueneTO-15ug/m32.140.384%RPD2.9 1.59 54.2trans-1,2-DichloroethyleneTO-15ug/m30.5960.413 trans-1,2-DichloroethyleneTO-15ug/m30.6080.405ABS0.012TrichloroethyleneTO-15ug/m334.10.555 TrichloroethyleneTO-15ug/m336.80.544%RPD35.5 2.70 7.6Vinyl acetateTO-15ug/m3<0.368 ND0.368 Vinyl acetateTO-15ug/m3<0.360 ND0.360Total Xylenes*TO-15ug/m38.860.444 Total Xylenes*TO-15ug/m35.980.435%RPD7.42.8838.8Notes:Note 1 = If duplicate or sample results are less than 5 times the reporting limit (RL), then the comparison is made by the absolute difference (ABS) between results. If ABS is less than the higher reporting limit, precision is considered acceptable.If duplicate or sample result is greater than 5 times the RL, then the comparison is assessed by the RPD (Note 2)Blank Cells = Consituent not detected, or below the method detection limit (MDL).ND = Constituent not detected above the method detection limit (MDL) or reporting limit (RL).NC - Only 1 = Variability not determined because the analyte was not detected in both the primary and duplicate samplem = Manual integration by laboratory personnelAcceptableHighNC - Only 1AcceptableAcceptableAcceptableSlightly HighHighSlightly HighAcceptableAcceptableAcceptableNC - Only 1Slightly HighTABLE 2SOIL GAS SAMPLE/SAMPLE DUPLICATE COMPARISON: "SG-2" AND "DUP-1"FORMER JC PENNEY'S AT NORTH HILLSPRIMARY SAMPLE: DUPLICATE SAMPLE:% RPD (Note 2)[((x1-x2)/AVG) * 100]LASSITER MILL ROADAbsolute Difference or % RPD (Note 1)5/19/2021SAMPLING DATE:Variability(See Note 2 if based on %RPD)(See Note 3 if based on Absolute Difference)Absolute Difference between ResultsSG-2RALEIGH, NORTH CAROLINAMID-ATLANTIC JOB NO. R3746.02SAMPLING DATE:AcceptableDUP-1Slightly High5/19/2021VOCs Method TO-15AVG. of Results for RPD Calc.AcceptableHighAcceptableNC - Only 1HighNote 3 = ABS less than the magnitude of the RL is considered acceptable. ABS within two times the magnitude of the RL is considered "slightly high". ABS greater than two times the RL is considered "High".Note 2 = The relative percent difference (RPD) and percent ratio were calculated for each pair (see formulas in column headings). Variability was evaluated based on % RPD: Good/Acceptable (<35%), Slightly High (>35% but <50%) and High (>%50).AcceptableAcceptableNC - Only 1AcceptableAcceptableAcceptableAcceptableAcceptableAcceptableSlightly High
APPENDIX A
BORING LOGS
ft -BLSBlow Counts
PID (ppm)ft ‐ indicates depth in feet N/A ‐ indicates not applicable to this boring
ft BLS ‐ indicates feet below land surface DTW = Depth to Water
PPM = Parts Per Million PID = Photoionization Detector
COMMENTS: Not Applicable20Site Name:  
Former JC
Penney's Drilling/Boring Method:Direct Push Total Boring Depth (ft):
N/A
Project Number:R3746.02 Sampling Method:Macrocore Sleeves Top of Casing Elev. (ft):N/A
Location: 
LOG OF BORING: SG-5
Page: 1 of 1
Raleigh NC Subcontractor/Drillers: Regional Probing Services Screen Interval (ft):
Gary Fischer/Kevin Clay
N/ADate Started:5/19/2021  Driller :Larry Opper DTW (ft):
Date Completed:5/19/2021 Monitoring Equipment:N/A Field Staff:
SOIL DESCRIPTION (color, texture, moisture, etc.)Construction Details
ft‐BLSNot ApplicableLight orange/light brown Slightly Sandy Clayey SILT with Gravel
Light brown Slightly Sandy/Clayey Slightly Micaceous SILT
Light brown Slightly Clayey Slightly Sandy SILT
Light orange Silty CLAY
2
8 8
10 10
12 12
14 14
16
18
20 20
Light brown/light orange Fine Sandy SILT, apparent saprolite
Tan Very Fine Sandy SILT, faint petroleum odor
Light orange and black Fine Sandy Micaceous SILT
18
16
2
4 4
6 6
ft -BLSBlow Counts
PID (ppm)ft ‐ indicates depth in feet N/A ‐ indicates not applicable to this boring
ft BLS ‐ indicates feet below land surface DTW = Depth to Water
PPM = Parts Per Million PID = Photoionization Detector
20
LOG OF BORING: SG-6
Page: 1 of 1
Site Name:  
Former JC
Penney's Drilling/Boring Method:Direct Push Total Boring Depth (ft):
N/A
Project Number:R3746.02 Sampling Method:Macrocore Sleeves Top of Casing Elev. (ft):N/A
Location: Raleigh NC Subcontractor/Drillers: Regional Probing Services Screen Interval (ft):
Gary Fischer/Kevin Clay
Date Started:5/19/2021  Driller :Larry Opper DTW (ft):N/A
Date Completed:5/19/2021 Monitoring Equipment:N/A Field Staff:
SOIL DESCRIPTION (color, texture, moisture, etc.)Construction Details
ft‐BLSNot ApplicableNot Applicable8
2
18
4
6 6
8
10
12 12
14 14
16
18
20 20
COMMENTS: 
3"-4" Asphalt and 2"-3" Gravel
Light brown Slightly Clayey Fine Sandy SILT
Light brown Slightly Sandy Clayey Micaceous SILT
Medium Brown Fine Sandy Micaceous SILT
Light brown Slightly Clayey Fine Sandy Micaceous SILT
Light orange and light brown Slightly Clayey Fine Sandy Micaceous SILT
Medium brown Very Fine Sandy SILT
Light orange Slightly Sandy Silty CLAY
Light brown and white Slightly Clayey Fine to Coarse Sandy SILT, apparent saprolite
16
10
2
4
ft -BLSBlow Counts
PID (ppm)ft ‐ indicates depth in feet N/A ‐ indicates not applicable to this boring
ft BLS ‐ indicates feet below land surface DTW = Depth to Water
PPM = Parts Per Million PID = Photoionization Detector
20
LOG OF BORING: SG-7
Page: 1 of 1
Site Name:  
Former JC
Penney's Drilling/Boring Method:Direct Push Total Boring Depth (ft):
N/A
Project Number:R3746.02 Sampling Method:Macrocore Sleeves Top of Casing Elev. (ft):N/A
Location: Raleigh NC Subcontractor/Drillers: Regional Probing Services Screen Interval (ft):
Gary Fischer/Kevin Clay
Date Started:5/19/2021  Driller :Larry Opper DTW (ft):N/A
Date Completed:5/19/2021 Monitoring Equipment:N/A Field Staff:
SOIL DESCRIPTION (color, texture, moisture, etc.)Construction Details
ft‐BLSNot ApplicableNot Applicable16
18
8
2
4 4
6 6
8
10 10
12 12
20
14
COMMENTS: 
Light and light orange Slightly Clayey Fine to Sandy SILT
Medium orange Slightly Sandy Silty CLAY
Light orange, dark brown, and tan Slightly Clayey Very Fine Sandy Micaceous SILT, apparent
saprolite
Light brown Very Fine Slightly Micaceous Very Fine Sandy SILT
14
16
18
20
2

APPENDIX B

LABORATORY ANALYTICAL REPORT AND CHAIN OF CUSTODY
RECORD

Quantitation Report Enthalpy Analytical, LLC
Sample Name
Sample Info 0521-033; can# 5719;500mL Load
Data File Y2101225.D
Dilution 1
Pressurization Factor 2.480
Acquisition Date 2021-05-21 16: 12: 15
Instrument Method EA-CA-TO15vl
Matrix AIR
Concentration RL MDL Concentration RL MDL .Target Compound __________________________ (PPBV) _________ (PPBV) __________ (PPBV) _________ (ug/m3) ________ (ug/m3) ________ (ug/m3) _________ Flag*-----·
Propylene ND 0.0958 0.0958 ND 0.165 0.165
Freon 12 (CCl2F2) 0.749 0.0971 0.0971 3.70 0.480 0.480
Freon 114 (C2Cl2F4) ND 0.0994 0.0994 ND 0.695 0.695
Chloromethane 0.157 0.0981 0.0981 0.324 0.203 0.203
Chloroethene (Vinyl chloride) 0.133 0.0991 0.0991 0.341 0.253 0.253
1,3-Butadiene 0.144 0.0965 0.0965 0.319 0.214 0.214 m
Bromomethane ND 0.0973 0.0973 ND 0.378 0.378
Chloroethane ND 0.101 0.101 ND 0.266 0.266
Freon 11 (CCl3F) 0.970 0.105 0.105 5.45 0.588 0.588
Freon 113 (C2Cl3F3) 0.145 0.101 0.101 1.11 0.772 0.772
1,1-Dichloroethene ND 0.0998 0.0998 ND 0.396 0.396
Acetone 26.3 0.0994 0.0994 62.5 0.236 0.236
Carbon disulfide 0.206 0.0989 0.0989 0.643 0.308 0.308
Isopropyl alcohol 4.70 0.0989 0.0989 11.5 0.243 0.243
Methylene chloride 0.435 0.254 0.254 1.51 0.882 0.882
trans-1,2-Dichloroethene ND 0.101 0.101 ND 0.401 0.401
Methyl tert-butyl ether ND 0.102 0.102 ND 0.368 0.368
Hexane 0.442 0.101 0.101 1.56 0.355 0.355
1, 1-Dichloroethane ND 0.0985 0.0985 ND 0.399 0.399
Vinyl acetate ND 0.101 0.101 ND 0.357 0.357
cis-1,2-Dichloroethene 0.192 0.100 0.100 0.760 0.397 0.397
Methyl ethyl ketone (2-Butanone) 0.833 0.103 0.103 2.46 0.302 0.302
Ethyl acetate 0.707 0.0990 0.0990 2.55 0.357 0.357
Chloroform 1.05 0.0995 0.0995 5.13 0.486 0.486
Tetrahydrofuran 0.197 0.100 0.100 0.581 0.296 0.296
1,1, ! -Trichloroethane ND 0.100 0.100 ND 0.547 0.547
Cyclohexane 1.47 0.102 0.102 5.05 0.350 0.350
Carbon tetrachloride 0.135 0.0999 0.0999 0.852 0.628 0.628 m
Benzene 0.291 0.0998 0.0998 0.931 0.319 0.319
1,2-Dichloroethane ND 0.102 0.102 ND 0.413 0.413
Heptane 1.99 0.100 0.100 8.17 0.412 0.412
Trichloroethene 0.128 0.100 0.100 0.688 0.539 0.539
1,2-Dichloropropane ND 0.0999 0.0999 ND 0.462 0.462
1,4-Dioxane 0.236 0.0995 0.0995 0.852 0.359 0.359
Bromodichloromethane ND 0.100 0.100 ND 0.671 0.671
cis-1,3-Dichloropropene ND 0.0985 0.0985 ND 0.447 0.447
Methyl isobutyl ketone 0.385 0.103 0.103 1.58 0.422 0.422
Toluene 1.38 0.101 0.101 5.18 0.381 0.381
trans-1,3-Dichloropropene ND 0.102 0.102 ND 0.465 0.465
1, 1,2-Trichloroethane ND 0.101 0.101 ND 0.550 0.550
Tetrachloroethene 20.7 0.101 0.101 141 0.688 0.688
2-Hexanone (Methyl butyl ketone) 0.242 0.101 0.101 0.991 0.416 0.416 m
Dibromochloromethane ND 0.100 0.100 ND 0.852 0.852
1,2-Dibromoethane ND 0.101 0.101 ND 0.780 0.780
Chlorobenzene ND 0.102 0.102 ND 0.470 0.470
Ethyl benzene 0.428 0.0985 0.0985 1.86 0.428 0.428
m-/p-Xylenes 1.48 0.101 0.101 6.42 0.437 0.437
a-Xylene 0.662 0.0994 0.0994 2.87 0.432 0.432
Styrene 0.165 0.0972 0.0972 0.704 0.414 0.414
Bromoform ND 0.0995 0.0995 ND 1.03 1.03
APPENDIX C

PRECISION EVALUATION METHODS
Precision is evaluated using the relative percent difference (RPD) between an actual sample and a duplicate sample. A comparison of the detected concentrations for the primary sample and its associated duplicate sample was made to evaluate the reproducibility of the sample
results based on the laboratory analysis and sample collection and transportation
procedures. For this comparison, if the duplicate or sample result was less than five (5) times the reporting limit (the higher of the two if they are not the same for each, which they almost
always are), then the comparison is made by the absolute difference between xl and x2,
defined in the formula below. If this difference is less than the magnitude of the (higher) reporting limit, precision is considered “acceptable.” If this difference is within two (2) times
the “acceptable” limits, the precision is considered “slightly high” (anything beyond that
would be considered “high”). If both sample and duplicate results are greater than five (5) times the reporting limit (the higher of the two RLs, if they are not the same), then precision is assessed by the % relative percent difference (RPD) using the following formula:
RPD = [(xl-x2)/x]100% Where:
xl = concentration of sample 1 of pair,
x2 = concentration of sample 2 of pair, and
x = average of sample 1 and sample 2.

RPD percentages <35% indicate “good/acceptable” variability, a %RPD >35% but < 50%
indicated that the variability was “slightly high”, and a %RPD >50% indicated a “high” degree of variability.
APPENDIX D

DEQ RISK SUMMARY SHEETS

Version Date:
Basis:
Site Name:
Site Address:
DEQ Section:
Site ID:
Exposure Unit ID:
Submittal Date:
Reviewed By:
Prepared By:Kevin Clay
Nolen Barefoot/Daniel Nielsen
SG-1
North Carolina Department of Environmental Quality
Risk Calculator
Former JC Penney's at North Hills
Lassiter Mill Road
January 2021
November 2020 EPA RSL Table
North Carolina DEQ Risk Calculator
DEQ Risk Calculator - Vapor Intrusion - Resident Soil Gas to Indoor Air
Version Date: January 2021
Basis: November 2020 EPA RSL Table
Site ID:
Exposure Unit ID: SG-1
CAS # Chemical Name:
Soil Gas
Concentration
(ug/m3)
Calculated
Indoor Air
Concentration
(ug/m3)
Target Indoor
Air Conc. for
Carcinogens @
TCR = 1E-06
Target Indoor Air
Conc. for Non-
Carcinogens @
THQ = 0.2
Calculated
Carcinogenic
Risk
Calculated
Non-
Carcinogenic
Hazard
Quotient
67-64-1 Acetone 62.5 1.875 -6.5E+03 5.8E-05
71-43-2 Benzene 0.931 0.02793 3.6E-01 6.3E+00 7.8E-08 8.9E-04
106-99-0 Butadiene, 1,3-0.319 0.00957 9.4E-02 4.2E-01 1.0E-07 4.6E-03
75-15-0 Carbon Disulfide 0.643 0.01929 -1.5E+02 2.6E-05
56-23-5 Carbon Tetrachloride 0.852 0.02556 4.7E-01 2.1E+01 5.5E-08 2.5E-04
67-66-3 Chloroform 5.13 0.1539 1.2E-01 2.0E+01 1.3E-06 1.5E-03
74-87-3 Chloromethane 0.324 0.00972 -1.9E+01 1.0E-04
110-82-7 Cyclohexane 5.05 0.1515 -1.3E+03 2.4E-05
106-93-4 Dibromoethane, 1,2-0.78 0.0234 4.7E-03 1.9E+00 5.0E-06 2.5E-03
95-50-1 Dichlorobenzene, 1,2-0.608 0.01824 -4.2E+01 8.7E-05
106-46-7 Dichlorobenzene, 1,4-0.605 0.01815 2.6E-01 1.7E+02 7.1E-08 2.2E-05
75-71-8 Dichlorodifluoromethane 3.7 0.111 -2.1E+01 1.1E-03
156-59-2 Dichloroethylene, cis-1,2-0.76 0.0228 --
123-91-1 Dioxane, 1,4-0.852 0.02556 5.6E-01 6.3E+00 4.6E-08 8.2E-04
111-77-3 Ethanol, 2-(2-methoxyethoxy)-161 4.83 --
141-78-6 Ethyl Acetate 2.55 0.0765 -1.5E+01 1.0E-03
100-41-4 Ethylbenzene 1.86 0.0558 1.1E+00 2.1E+02 5.0E-08 5.4E-05
109-99-9 ~Tetrahydrofuran 0.581 0.01743 -4.2E+02 8.4E-06
142-82-5 Heptane, N-8.17 0.2451 -8.3E+01 5.9E-04
87-68-3 Hexachlorobutadiene 1.22 0.0366 1.3E-01 - 2.9E-07
110-54-3 Hexane, N-1.56 0.0468 -1.5E+02 6.4E-05
591-78-6 Hexanone, 2-0.991 0.02973 -6.3E+00 9.5E-04
67-63-0 Isopropanol 11.5 0.345 -4.2E+01 1.7E-03
78-93-3 Methyl Ethyl Ketone (2-Butanone)2.46 0.0738 -1.0E+03 1.4E-05
108-10-1 Methyl Isobutyl Ketone (4-methyl-2-pentanone) 1.58 0.0474 -6.3E+02 1.5E-05
75-09-2 Methylene Chloride 1.51 0.0453 1.0E+02 1.3E+02 4.5E-10 7.2E-05
91-20-3 ~Naphthalene 1.07 0.0321 8.3E-02 6.3E-01 3.9E-07 1.0E-02
100-42-5 Styrene 0.704 0.02112 -2.1E+02 2.0E-05
127-18-4 Tetrachloroethylene 141 4.23 1.1E+01 8.3E+00 3.9E-07 1.0E-01
108-88-3 Toluene 5.18 0.1554 -1.0E+03 3.0E-05
76-13-1 Trichloro-1,2,2-trifluoroethane, 1,1,2- 1.11 0.0333 -1.0E+036.4E-06
120-82-1 Trichlorobenzene, 1,2,4-0.88 0.0264 -4.2E-01 1.3E-02
79-01-6 Trichloroethylene 0.688 0.02064 4.8E-01 4.2E-01 4.3E-08 9.9E-03
75-69-4 Trichlorofluoromethane 5.45 0.1635 --
95-63-6 Trimethylbenzene, 1,2,4-5.57 0.1671 -1.3E+01 2.7E-03
108-67-8 Trimethylbenzene, 1,3,5-1.72 0.0516 -1.3E+01 8.2E-04
75-01-4 Vinyl Chloride 0.341 0.01023 1.7E-01 2.1E+01 6.1E-08 9.8E-05
1330-20-7 Xylenes 9.29 0.2787 -2.1E+01 2.7E-03
Cumulative: 7.8E-06 1.6E-01
All concentrations are in ug/m3
Output Form 3B
Carcinogenic risk and hazard quotient cells highlighted in orange are associated with non-volatile chemicals. Since these chemicals do not pose a vapor intrusion
risk, no risk values are calculated for these chemicals.
North Carolina DEQ Risk Calculator
DEQ Risk Calculator - Vapor Intrusion - Non-Residential Worker Soil Gas to Indoor Air
Version Date: January 2021
Basis: November 2020 EPA RSL Table
Site ID:
Exposure Unit ID: SG-1
CAS #Chemical Name:
Soil Gas
Concentration
(ug/m3)
Calculated
Indoor Air
Concentration
(ug/m3)
Target Indoor
Air Conc. for
Carcinogens @
TCR = 1E-06
Target Indoor Air
Conc. for Non-
Carcinogens @
THQ = 0.2
Calculated
Carcinogenic
Risk
Calculated
Non-
Carcinogenic
Hazard
Quotient
67-64-1 Acetone 62.5 0.625 -2.7E+04 4.6E-06
71-43-2 Benzene 0.931 0.00931 1.6E+00 2.6E+01 5.9E-09 7.1E-05
106-99-0 Butadiene, 1,3-0.319 0.00319 4.1E-01 1.8E+00 7.8E-09 3.6E-04
75-15-0 Carbon Disulfide 0.643 0.00643 -6.1E+02 2.1E-06
56-23-5 Carbon Tetrachloride 0.852 0.00852 2.0E+00 8.8E+01 4.2E-09 1.9E-05
67-66-3 Chloroform 5.13 0.0513 5.3E-01 8.6E+01 9.6E-08 1.2E-04
74-87-3 Chloromethane 0.324 0.00324 -7.9E+01 8.2E-06
110-82-7 Cyclohexane 5.05 0.0505 -5.3E+03 1.9E-06
106-93-4 Dibromoethane, 1,2-0.78 0.0078 2.0E-02 7.9E+00 3.8E-07 2.0E-04
95-50-1 Dichlorobenzene, 1,2-0.608 0.00608 -1.8E+02 6.9E-06
106-46-7 Dichlorobenzene, 1,4-0.605 0.00605 1.1E+00 7.0E+02 5.4E-09 1.7E-06
75-71-8 Dichlorodifluoromethane 3.7 0.037 -8.8E+01 8.4E-05
156-59-2 Dichloroethylene, cis-1,2-0.76 0.0076 --
123-91-1 Dioxane, 1,4-0.852 0.00852 2.5E+00 2.6E+01 3.5E-09 6.5E-05
111-77-3 Ethanol, 2-(2-methoxyethoxy)-161 1.61 --
141-78-6 Ethyl Acetate 2.55 0.0255 -6.1E+01 8.3E-05
100-41-4 Ethylbenzene 1.86 0.0186 4.9E+00 8.8E+02 3.8E-09 4.2E-06
109-99-9 ~Tetrahydrofuran 0.581 0.00581 -1.8E+03 6.6E-07
142-82-5 Heptane, N-8.17 0.0817 -3.5E+02 4.7E-05
87-68-3 Hexachlorobutadiene 1.22 0.0122 5.6E-01 - 2.2E-08
110-54-3 Hexane, N-1.56 0.0156 -6.1E+02 5.1E-06
591-78-6 Hexanone, 2-0.991 0.00991 -2.6E+01 7.5E-05
67-63-0 Isopropanol 11.5 0.115 -1.8E+02 1.3E-04
78-93-3 Methyl Ethyl Ketone (2-Butanone)2.46 0.0246 -4.4E+03 1.1E-06
108-10-1 Methyl Isobutyl Ketone (4-methyl-2-pentanone) 1.58 0.0158 -2.6E+03 1.2E-06
75-09-2 Methylene Chloride 1.51 0.0151 1.2E+03 5.3E+02 1.2E-11 5.7E-06
91-20-3 ~Naphthalene 1.07 0.0107 3.6E-01 2.6E+00 3.0E-08 8.1E-04
100-42-5 Styrene 0.704 0.00704 -8.8E+02 1.6E-06
127-18-4 Tetrachloroethylene 141 1.41 4.7E+01 3.5E+01 3.0E-08 8.0E-03
108-88-3 Toluene 5.18 0.0518 -4.4E+03 2.4E-06
76-13-1 Trichloro-1,2,2-trifluoroethane, 1,1,2- 1.11 0.0111 -4.4E+035.1E-07
120-82-1 Trichlorobenzene, 1,2,4-0.88 0.0088 -1.8E+00 1.0E-03
79-01-6 Trichloroethylene 0.688 0.00688 3.0E+00 1.8E+00 2.3E-09 7.9E-04
75-69-4 Trichlorofluoromethane 5.45 0.0545 --
95-63-6 Trimethylbenzene, 1,2,4-5.57 0.0557 -5.3E+01 2.1E-04
108-67-8 Trimethylbenzene, 1,3,5-1.72 0.0172 -5.3E+01 6.5E-05
75-01-4 Vinyl Chloride 0.341 0.00341 2.8E+00 8.8E+01 1.2E-09 7.8E-06
1330-20-7 Xylenes 9.29 0.0929 -8.8E+01 2.1E-04
Cumulative: 5.9E-07 1.2E-02
All concentrations are in ug/m3
Output Form 3E
Carcinogenic risk and hazard quotient cells highlighted in orange are associated with non-volatile chemicals. Since these chemicals do not pose a vapor intrusion
risk, no risk values are calculated for these chemicals.
North Carolina DEQ Risk Calculator
Version Date:
Basis:
Site Name:
Site Address:
DEQ Section:
Site ID:
Exposure Unit ID:
Submittal Date:
Reviewed By:
SG-2
North Carolina Department of Environmental Quality
Risk Calculator
Former JC Penney's at North Hills
Lassiter Mill Road
January 2021
November 2020 EPA RSL Table
Prepared By:Kevin Clay
Nolen Barefoot/Daniel Nielsen
North Carolina DEQ Risk Calculator
DEQ Risk Calculator - Vapor Intrusion - Resident Soil Gas to Indoor Air
Version Date: January 2021
Basis: November 2020 EPA RSL Table
Site ID:
Exposure Unit ID: SG-2
CAS # Chemical Name:
Soil Gas
Concentration
(ug/m3)
Calculated
Indoor Air
Concentration
(ug/m3)
Target Indoor
Air Conc. for
Carcinogens @
TCR = 1E-06
Target Indoor Air
Conc. for Non-
Carcinogens @
THQ = 0.2
Calculated
Carcinogenic
Risk
Calculated
Non-
Carcinogenic
Hazard
Quotient
67-64-1 Acetone 77.2 2.316 -6.5E+03 7.2E-05
71-43-2 Benzene 0.719 0.02157 3.6E-01 6.3E+00 6.0E-08 6.9E-04
106-99-0 Butadiene, 1,3-0.353 0.01059 9.4E-02 4.2E-01 1.1E-07 5.1E-03
75-15-0 Carbon Disulfide 0.979 0.02937 -1.5E+02 4.0E-05
67-66-3 Chloroform 25.6 0.768 1.2E-01 2.0E+01 6.3E-06 7.5E-03
110-82-7 Cyclohexane 0.809 0.02427 -1.3E+03 3.9E-06
106-93-4 Dibromoethane, 1,2-0.802 0.02406 4.7E-03 1.9E+00 5.1E-06 2.6E-03
75-71-8 Dichlorodifluoromethane 2.33 0.0699 -2.1E+01 6.7E-04
156-59-2 Dichloroethylene, cis-1,2-0.961 0.02883 --
156-60-5 Dichloroethylene, trans-1,2-0.608 0.01824 -8.3E+00 4.4E-04
123-91-1 Dioxane, 1,4-0.707 0.02121 5.6E-01 6.3E+00 3.8E-08 6.8E-04
111-77-3 Ethanol, 2-(2-methoxyethoxy)-83.5 2.505 --
141-78-6 Ethyl Acetate 2.29 0.0687 -1.5E+01 9.4E-04
100-41-4 Ethylbenzene 1.52 0.0456 1.1E+00 2.1E+02 4.1E-08 4.4E-05
109-99-9 ~Tetrahydrofuran 0.325 0.00975 -4.2E+02 4.7E-06
142-82-5 Heptane, N-2.47 0.0741 -8.3E+01 1.8E-04
110-54-3 Hexane, N-0.571 0.01713 -1.5E+02 2.3E-05
591-78-6 Hexanone, 2-1.77 0.0531 -6.3E+00 1.7E-03
67-63-0 Isopropanol 6.74 0.2022 -4.2E+01 9.7E-04
78-93-3 Methyl Ethyl Ketone (2-Butanone)9.36 0.2808 -1.0E+03 5.4E-05
108-10-1 Methyl Isobutyl Ketone (4-methyl-2-pentanone) 1.61 0.0483 -6.3E+02 1.5E-05
91-20-3 ~Naphthalene 0.736 0.02208 8.3E-02 6.3E-01 2.7E-07 7.1E-03
115-07-1 Propylene 3.18 0.0954 -6.3E+02 3.0E-05
127-18-4 Tetrachloroethylene 12514 375.42 1.1E+01 8.3E+00 3.5E-05 9.0E+00
108-88-3 Toluene 3.73 0.1119 -1.0E+03 2.1E-05
79-01-6 Trichloroethylene 36.8 1.104 4.8E-01 4.2E-01 2.3E-06 5.3E-01
75-69-4 Trichlorofluoromethane 2.4 0.072 --
95-63-6 Trimethylbenzene, 1,2,4-5.07 0.1521 -1.3E+01 2.4E-03
108-67-8 Trimethylbenzene, 1,3,5-1.11 0.0333 -1.3E+01 5.3E-04
1330-20-7 Xylenes 8.86 0.2658 -2.1E+01 2.5E-03
Cumulative: 4.9E-05 9.6E+00
All concentrations are in ug/m3
Output Form 3B
Carcinogenic risk and hazard quotient cells highlighted in orange are associated with non-volatile chemicals. Since these chemicals do not pose a vapor intrusion
risk, no risk values are calculated for these chemicals.
North Carolina DEQ Risk Calculator
DEQ Risk Calculator - Vapor Intrusion - Non-Residential Worker Soil Gas to Indoor Air
Version Date: January 2021
Basis: November 2020 EPA RSL Table
Site ID:
Exposure Unit ID: SG-2
CAS #Chemical Name:
Soil Gas
Concentration
(ug/m3)
Calculated
Indoor Air
Concentration
(ug/m3)
Target Indoor
Air Conc. for
Carcinogens @
TCR = 1E-06
Target Indoor Air
Conc. for Non-
Carcinogens @
THQ = 0.2
Calculated
Carcinogenic
Risk
Calculated
Non-
Carcinogenic
Hazard
Quotient
67-64-1 Acetone 77.2 0.772 -2.7E+04 5.7E-06
71-43-2 Benzene 0.719 0.00719 1.6E+00 2.6E+01 4.6E-09 5.5E-05
106-99-0 Butadiene, 1,3-0.353 0.00353 4.1E-01 1.8E+00 8.6E-09 4.0E-04
75-15-0 Carbon Disulfide 0.979 0.00979 -6.1E+02 3.2E-06
67-66-3 Chloroform 25.6 0.256 5.3E-01 8.6E+01 4.8E-07 6.0E-04
110-82-7 Cyclohexane 0.809 0.00809 -5.3E+03 3.1E-07
106-93-4 Dibromoethane, 1,2-0.802 0.00802 2.0E-02 7.9E+00 3.9E-07 2.0E-04
75-71-8 Dichlorodifluoromethane 2.33 0.0233 -8.8E+01 5.3E-05
156-59-2 Dichloroethylene, cis-1,2-0.961 0.00961 --
156-60-5 Dichloroethylene, trans-1,2-0.608 0.00608 -3.5E+01 3.5E-05
123-91-1 Dioxane, 1,4-0.707 0.00707 2.5E+00 2.6E+01 2.9E-09 5.4E-05
111-77-3 Ethanol, 2-(2-methoxyethoxy)-83.5 0.835 --
141-78-6 Ethyl Acetate 2.29 0.0229 -6.1E+01 7.5E-05
100-41-4 Ethylbenzene 1.52 0.0152 4.9E+00 8.8E+02 3.1E-09 3.5E-06
109-99-9 ~Tetrahydrofuran 0.325 0.00325 -1.8E+03 3.7E-07
142-82-5 Heptane, N-2.47 0.0247 -3.5E+02 1.4E-05
110-54-3 Hexane, N-0.571 0.00571 -6.1E+02 1.9E-06
591-78-6 Hexanone, 2-1.77 0.0177 -2.6E+01 1.3E-04
67-63-0 Isopropanol 6.74 0.0674 -1.8E+02 7.7E-05
78-93-3 Methyl Ethyl Ketone (2-Butanone)9.36 0.0936 -4.4E+03 4.3E-06
108-10-1 Methyl Isobutyl Ketone (4-methyl-2-pentanone) 1.61 0.0161 -2.6E+03 1.2E-06
91-20-3 ~Naphthalene 0.736 0.00736 3.6E-01 2.6E+00 2.0E-08 5.6E-04
115-07-1 Propylene 3.18 0.0318 -2.6E+03 2.4E-06
127-18-4 Tetrachloroethylene 12514 125.14 4.7E+01 3.5E+01 2.7E-06 7.1E-01
108-88-3 Toluene 3.73 0.0373 -4.4E+03 1.7E-06
79-01-6 Trichloroethylene 36.8 0.368 3.0E+00 1.8E+00 1.2E-07 4.2E-02
75-69-4 Trichlorofluoromethane 2.4 0.024 --
95-63-6 Trimethylbenzene, 1,2,4-5.07 0.0507 -5.3E+01 1.9E-04
108-67-8 Trimethylbenzene, 1,3,5-1.11 0.0111 -5.3E+01 4.2E-05
1330-20-7 Xylenes 8.86 0.0886 -8.8E+01 2.0E-04
Cumulative: 3.7E-06 7.6E-01
All concentrations are in ug/m3
Output Form 3E
Carcinogenic risk and hazard quotient cells highlighted in orange are associated with non-volatile chemicals. Since these chemicals do not pose a vapor intrusion
risk, no risk values are calculated for these chemicals.
North Carolina DEQ Risk Calculator
Version Date:
Basis:
Site Name:
Site Address:
DEQ Section:
Site ID:
Exposure Unit ID:
Submittal Date:
Reviewed By:
Prepared By:Kevin Clay
Nolen Barefoot/Dan Nielsen
SG-3
North Carolina Department of Environmental Quality
Risk Calculator
Former JC Penney's at North Hills
Lassiter Mill Road
January 2021
November 2020 EPA RSL Table
North Carolina DEQ Risk Calculator
DEQ Risk Calculator - Vapor Intrusion - Resident Soil Gas to Indoor Air
Version Date: January 2021
Basis: November 2020 EPA RSL Table
Site ID:
Exposure Unit ID: SG-3
CAS # Chemical Name:
Soil Gas
Concentration
(ug/m3)
Calculated
Indoor Air
Concentration
(ug/m3)
Target Indoor
Air Conc. for
Carcinogens @
TCR = 1E-06
Target Indoor Air
Conc. for Non-
Carcinogens @
THQ = 0.2
Calculated
Carcinogenic
Risk
Calculated
Non-
Carcinogenic
Hazard
Quotient
67-64-1 Acetone 85.6 2.568 -6.5E+03 7.9E-05
71-43-2 Benzene 1.41 0.0423 3.6E-01 6.3E+00 1.2E-07 1.4E-03
106-99-0 Butadiene, 1,3-0.26 0.0078 9.4E-02 4.2E-01 8.3E-08 3.7E-03
75-15-0 Carbon Disulfide 0.643 0.01929 -1.5E+02 2.6E-05
67-66-3 Chloroform 5.3 0.159 1.2E-01 2.0E+01 1.3E-06 1.6E-03
74-87-3 Chloromethane 0.259 0.00777 -1.9E+01 8.3E-05
110-82-7 Cyclohexane 1.83 0.0549 -1.3E+03 8.8E-06
106-93-4 Dibromoethane, 1,2-0.815 0.02445 4.7E-03 1.9E+00 5.2E-06 2.6E-03
75-71-8 Dichlorodifluoromethane 1.99 0.0597 -2.1E+01 5.7E-04
123-91-1 Dioxane, 1,4-1.34 0.0402 5.6E-01 6.3E+00 7.2E-08 1.3E-03
111-77-3 Ethanol, 2-(2-methoxyethoxy)-126 3.78 --
141-78-6 Ethyl Acetate 0.975 0.02925 -1.5E+01 4.0E-04
100-41-4 Ethylbenzene 1.63 0.0489 1.1E+00 2.1E+02 4.4E-08 4.7E-05
142-82-5 Heptane, N-5.59 0.1677 -8.3E+01 4.0E-04
110-54-3 Hexane, N-7.84 0.2352 -1.5E+02 3.2E-04
591-78-6 Hexanone, 2-3.05 0.0915 -6.3E+00 2.9E-03
67-63-0 Isopropanol 9.61 0.2883 -4.2E+01 1.4E-03
78-93-3 Methyl Ethyl Ketone (2-Butanone)14.1 0.423 -1.0E+03 8.1E-05
108-10-1 Methyl Isobutyl Ketone (4-methyl-2-pentanone) 2.23 0.0669 -6.3E+02 2.1E-05
115-07-1 Propylene 8.84 0.2652 -6.3E+02 8.5E-05
127-18-4 Tetrachloroethylene 4903 147.09 1.1E+01 8.3E+00 1.4E-05 3.5E+00
108-88-3 Toluene 6.05 0.1815 -1.0E+03 3.5E-05
79-01-6 Trichloroethylene 7.43 0.2229 4.8E-01 4.2E-01 4.7E-07 1.1E-01
75-69-4 Trichlorofluoromethane 1.86 0.0558 --
95-63-6 Trimethylbenzene, 1,2,4-3.13 0.0939 -1.3E+01 1.5E-03
108-67-8 Trimethylbenzene, 1,3,5-0.646 0.01938 -1.3E+01 3.1E-04
1330-20-7 Xylenes 7.8 0.234 -2.1E+01 2.2E-03
Cumulative: 2.1E-05 3.7E+00
All concentrations are in ug/m3
Output Form 3B
Carcinogenic risk and hazard quotient cells highlighted in orange are associated with non-volatile chemicals. Since these chemicals do not pose a vapor intrusion
risk, no risk values are calculated for these chemicals.
North Carolina DEQ Risk Calculator
DEQ Risk Calculator - Vapor Intrusion - Non-Residential Worker Soil Gas to Indoor Air
Version Date: January 2021
Basis: November 2020 EPA RSL Table
Site ID:
Exposure Unit ID: SG-3
CAS #Chemical Name:
Soil Gas
Concentration
(ug/m3)
Calculated
Indoor Air
Concentration
(ug/m3)
Target Indoor
Air Conc. for
Carcinogens @
TCR = 1E-06
Target Indoor Air
Conc. for Non-
Carcinogens @
THQ = 0.2
Calculated
Carcinogenic
Risk
Calculated
Non-
Carcinogenic
Hazard
Quotient
67-64-1 Acetone 85.6 0.856 -2.7E+04 6.3E-06
71-43-2 Benzene 1.41 0.0141 1.6E+00 2.6E+01 9.0E-09 1.1E-04
106-99-0 Butadiene, 1,3-0.26 0.0026 4.1E-01 1.8E+00 6.4E-09 3.0E-04
75-15-0 Carbon Disulfide 0.643 0.00643 -6.1E+02 2.1E-06
67-66-3 Chloroform 5.3 0.053 5.3E-01 8.6E+01 9.9E-08 1.2E-04
74-87-3 Chloromethane 0.259 0.00259 -7.9E+01 6.6E-06
110-82-7 Cyclohexane 1.83 0.0183 -5.3E+03 7.0E-07
106-93-4 Dibromoethane, 1,2-0.815 0.00815 2.0E-02 7.9E+00 4.0E-07 2.1E-04
75-71-8 Dichlorodifluoromethane 1.99 0.0199 -8.8E+01 4.5E-05
123-91-1 Dioxane, 1,4-1.34 0.0134 2.5E+00 2.6E+01 5.5E-09 1.0E-04
111-77-3 Ethanol, 2-(2-methoxyethoxy)-126 1.26 --
141-78-6 Ethyl Acetate 0.975 0.00975 -6.1E+01 3.2E-05
100-41-4 Ethylbenzene 1.63 0.0163 4.9E+00 8.8E+02 3.3E-09 3.7E-06
142-82-5 Heptane, N-5.59 0.0559 -3.5E+02 3.2E-05
110-54-3 Hexane, N-7.84 0.0784 -6.1E+02 2.6E-05
591-78-6 Hexanone, 2-3.05 0.0305 -2.6E+01 2.3E-04
67-63-0 Isopropanol 9.61 0.0961 -1.8E+02 1.1E-04
78-93-3 Methyl Ethyl Ketone (2-Butanone)14.1 0.141 -4.4E+03 6.4E-06
108-10-1 Methyl Isobutyl Ketone (4-methyl-2-pentanone) 2.23 0.0223 -2.6E+03 1.7E-06
115-07-1 Propylene 8.84 0.0884 -2.6E+03 6.7E-06
127-18-4 Tetrachloroethylene 4903 49.03 4.7E+01 3.5E+01 1.0E-06 2.8E-01
108-88-3 Toluene 6.05 0.0605 -4.4E+03 2.8E-06
79-01-6 Trichloroethylene 7.43 0.0743 3.0E+00 1.8E+00 2.5E-08 8.5E-03
75-69-4 Trichlorofluoromethane 1.86 0.0186 --
95-63-6 Trimethylbenzene, 1,2,4-3.13 0.0313 -5.3E+01 1.2E-04
108-67-8 Trimethylbenzene, 1,3,5-0.646 0.00646 -5.3E+01 2.5E-05
1330-20-7 Xylenes 7.8 0.078 -8.8E+01 1.8E-04
Cumulative: 1.6E-06 2.9E-01
All concentrations are in ug/m3
Output Form 3E
Carcinogenic risk and hazard quotient cells highlighted in orange are associated with non-volatile chemicals. Since these chemicals do not pose a vapor intrusion
risk, no risk values are calculated for these chemicals.
North Carolina DEQ Risk Calculator
Version Date:
Basis:
Site Name:
Site Address:
DEQ Section:
Site ID:
Exposure Unit ID:
Submittal Date:
Reviewed By:
Prepared By:Kevin Clay
Nolen Barefoot/Daniel Nielsen
SG-4
North Carolina Department of Environmental Quality
Risk Calculator
January 2021
November 2020 EPA RSL Table
North Carolina DEQ Risk Calculator
DEQ Risk Calculator - Vapor Intrusion - Resident Soil Gas to Indoor Air
Version Date: January 2021
Basis: November 2020 EPA RSL Table
Site ID:
Exposure Unit ID: SG-4
CAS # Chemical Name:
Soil Gas
Concentration
(ug/m3)
Calculated
Indoor Air
Concentration
(ug/m3)
Target Indoor
Air Conc. for
Carcinogens @
TCR = 1E-06
Target Indoor Air
Conc. for Non-
Carcinogens @
THQ = 0.2
Calculated
Carcinogenic
Risk
Calculated
Non-
Carcinogenic
Hazard
Quotient
67-64-1 Acetone 46.8 1.404 -6.5E+03 4.3E-05
71-43-2 Benzene 0.47 0.0141 3.6E-01 6.3E+00 3.9E-08 4.5E-04
106-99-0 Butadiene, 1,3-0.232 0.00696 9.4E-02 4.2E-01 7.4E-08 3.3E-03
75-15-0 Carbon Disulfide 0.34 0.0102 -1.5E+02 1.4E-05
110-82-7 Cyclohexane 1.27 0.0381 -1.3E+03 6.1E-06
106-93-4 Dibromoethane, 1,2-0.743 0.02229 4.7E-03 1.9E+00 4.8E-06 2.4E-03
75-71-8 Dichlorodifluoromethane 3.64 0.1092 -2.1E+01 1.0E-03
123-91-1 Dioxane, 1,4-1.38 0.0414 5.6E-01 6.3E+00 7.4E-08 1.3E-03
111-77-3 Ethanol, 2-(2-methoxyethoxy)-108 3.24 --
141-78-6 Ethyl Acetate 1.49 0.0447 -1.5E+01 6.1E-04
100-41-4 Ethylbenzene 0.82 0.0246 1.1E+00 2.1E+02 2.2E-08 2.4E-05
142-82-5 Heptane, N-4.28 0.1284 -8.3E+01 3.1E-04
110-54-3 Hexane, N-0.479 0.01437 -1.5E+02 2.0E-05
591-78-6 Hexanone, 2-0.611 0.01833 -6.3E+00 5.9E-04
67-63-0 Isopropanol 12.3 0.369 -4.2E+01 1.8E-03
78-93-3 Methyl Ethyl Ketone (2-Butanone)2.21 0.0663 -1.0E+03 1.3E-05
108-10-1 Methyl Isobutyl Ketone (4-methyl-2-pentanone) 0.909 0.02727 -6.3E+02 8.7E-06
115-07-1 Propylene 13 0.39 -6.3E+02 1.2E-04
100-42-5 Styrene 0.735 0.02205 -2.1E+02 2.1E-05
127-18-4 Tetrachloroethylene 1806 54.18 1.1E+01 8.3E+00 5.0E-06 1.3E+00
108-88-3 Toluene 2.26 0.0678 -1.0E+03 1.3E-05
79-01-6 Trichloroethylene 1.65 0.0495 4.8E-01 4.2E-01 1.0E-07 2.4E-02
75-69-4 Trichlorofluoromethane 3.19 0.0957 --
95-63-6 Trimethylbenzene, 1,2,4-2.93 0.0879 -1.3E+01 1.4E-03
108-67-8 Trimethylbenzene, 1,3,5-0.738 0.02214 -1.3E+01 3.5E-04
1330-20-7 Xylenes 4.53 0.1359 -2.1E+01 1.3E-03
Cumulative: 1.0E-05 1.3E+00
All concentrations are in ug/m3
Output Form 3B
Carcinogenic risk and hazard quotient cells highlighted in orange are associated with non-volatile chemicals. Since these chemicals do not pose a vapor intrusion
risk, no risk values are calculated for these chemicals.
North Carolina DEQ Risk Calculator
DEQ Risk Calculator - Vapor Intrusion - Non-Residential Worker Soil Gas to Indoor Air
Version Date: January 2021
Basis: November 2020 EPA RSL Table
Site ID:
Exposure Unit ID: SG-4
CAS #Chemical Name:
Soil Gas
Concentration
(ug/m3)
Calculated
Indoor Air
Concentration
(ug/m3)
Target Indoor
Air Conc. for
Carcinogens @
TCR = 1E-06
Target Indoor Air
Conc. for Non-
Carcinogens @
THQ = 0.2
Calculated
Carcinogenic
Risk
Calculated
Non-
Carcinogenic
Hazard
Quotient
67-64-1 Acetone 46.8 0.468 -2.7E+04 3.4E-06
71-43-2 Benzene 0.47 0.0047 1.6E+00 2.6E+01 3.0E-09 3.6E-05
106-99-0 Butadiene, 1,3-0.232 0.00232 4.1E-01 1.8E+00 5.7E-09 2.6E-04
75-15-0 Carbon Disulfide 0.34 0.0034 -6.1E+02 1.1E-06
110-82-7 Cyclohexane 1.27 0.0127 -5.3E+03 4.8E-07
106-93-4 Dibromoethane, 1,2-0.743 0.00743 2.0E-02 7.9E+00 3.6E-07 1.9E-04
75-71-8 Dichlorodifluoromethane 3.64 0.0364 -8.8E+01 8.3E-05
123-91-1 Dioxane, 1,4-1.38 0.0138 2.5E+00 2.6E+01 5.6E-09 1.1E-04
111-77-3 Ethanol, 2-(2-methoxyethoxy)-108 1.08 --
141-78-6 Ethyl Acetate 1.49 0.0149 -6.1E+01 4.9E-05
100-41-4 Ethylbenzene 0.82 0.0082 4.9E+00 8.8E+02 1.7E-09 1.9E-06
142-82-5 Heptane, N-4.28 0.0428 -3.5E+02 2.4E-05
110-54-3 Hexane, N-0.479 0.00479 -6.1E+02 1.6E-06
591-78-6 Hexanone, 2-0.611 0.00611 -2.6E+01 4.6E-05
67-63-0 Isopropanol 12.3 0.123 -1.8E+02 1.4E-04
78-93-3 Methyl Ethyl Ketone (2-Butanone)2.21 0.0221 -4.4E+03 1.0E-06
108-10-1 Methyl Isobutyl Ketone (4-methyl-2-pentanone) 0.909 0.00909 -2.6E+03 6.9E-07
115-07-1 Propylene 13 0.13 -2.6E+03 9.9E-06
100-42-5 Styrene 0.735 0.00735 -8.8E+02 1.7E-06
127-18-4 Tetrachloroethylene 1806 18.06 4.7E+01 3.5E+01 3.8E-07 1.0E-01
108-88-3 Toluene 2.26 0.0226 -4.4E+03 1.0E-06
79-01-6 Trichloroethylene 1.65 0.0165 3.0E+00 1.8E+00 5.5E-09 1.9E-03
75-69-4 Trichlorofluoromethane 3.19 0.0319 --
95-63-6 Trimethylbenzene, 1,2,4-2.93 0.0293 -5.3E+01 1.1E-04
108-67-8 Trimethylbenzene, 1,3,5-0.738 0.00738 -5.3E+01 2.8E-05
1330-20-7 Xylenes 4.53 0.0453 -8.8E+01 1.0E-04
Cumulative: 7.7E-07 1.1E-01
All concentrations are in ug/m3
Output Form 3E
Carcinogenic risk and hazard quotient cells highlighted in orange are associated with non-volatile chemicals. Since these chemicals do not pose a vapor intrusion
risk, no risk values are calculated for these chemicals.
North Carolina DEQ Risk Calculator
Version Date:
Basis:
Site Name:
Site Address:
DEQ Section:
Site ID:
Exposure Unit ID:
Submittal Date:
Reviewed By:
Prepared By:Kevin Clay
Nolen Barefoot/Daniel Nielsen
SG-5
North Carolina Department of Environmental Quality
Risk Calculator
January 2021
November 2020 EPA RSL Table
North Carolina DEQ Risk Calculator
DEQ Risk Calculator - Vapor Intrusion - Resident Soil Gas to Indoor Air
Version Date: January 2021
Basis: November 2020 EPA RSL Table
Site ID:
Exposure Unit ID: SG-5
CAS # Chemical Name:
Soil Gas
Concentration
(ug/m3)
Calculated
Indoor Air
Concentration
(ug/m3)
Target Indoor
Air Conc. for
Carcinogens @
TCR = 1E-06
Target Indoor Air
Conc. for Non-
Carcinogens @
THQ = 0.2
Calculated
Carcinogenic
Risk
Calculated
Non-
Carcinogenic
Hazard
Quotient
67-64-1 Acetone 37.9 1.137 -6.5E+03 3.5E-05
71-43-2 Benzene 3.69 0.1107 3.6E-01 6.3E+00 3.1E-07 3.5E-03
106-99-0 Butadiene, 1,3-2.97 0.0891 9.4E-02 4.2E-01 9.5E-07 4.3E-02
75-15-0 Carbon Disulfide 2.31 0.0693 -1.5E+02 9.5E-05
67-66-3 Chloroform 4.29 0.1287 1.2E-01 2.0E+01 1.1E-06 1.3E-03
74-87-3 Chloromethane 1.9 0.057 -1.9E+01 6.1E-04
110-82-7 Cyclohexane 4.25 0.1275 -1.3E+03 2.0E-05
106-93-4 Dibromoethane, 1,2-0.819 0.02457 4.7E-03 1.9E+00 5.3E-06 2.6E-03
75-71-8 Dichlorodifluoromethane 1.58 0.0474 -2.1E+01 4.5E-04
78-87-5 Dichloropropane, 1,2-0.791 0.02373 7.6E-01 8.3E-01 3.1E-08 5.7E-03
111-77-3 Ethanol, 2-(2-methoxyethoxy)-19.9 0.597 --
141-78-6 Ethyl Acetate 97.1 2.913 -1.5E+01 4.0E-02
100-41-4 Ethylbenzene 2.22 0.0666 1.1E+00 2.1E+02 5.9E-08 6.4E-05
109-99-9 ~Tetrahydrofuran 1.41 0.0423 -4.2E+02 2.0E-05
142-82-5 Heptane, N-2.89 0.0867 -8.3E+01 2.1E-04
110-54-3 Hexane, N-3.57 0.1071 -1.5E+02 1.5E-04
591-78-6 Hexanone, 2-2.29 0.0687 -6.3E+00 2.2E-03
67-63-0 Isopropanol 13 0.39 -4.2E+01 1.9E-03
78-93-3 Methyl Ethyl Ketone (2-Butanone)7.39 0.2217 -1.0E+03 4.3E-05
108-10-1 Methyl Isobutyl Ketone (4-methyl-2-pentanone) 39.7 1.191 -6.3E+02 3.8E-04
1634-04-4 Methyl tert-Butyl Ether (MTBE)0.811 0.02433 1.1E+01 6.3E+02 2.3E-09 7.8E-06
75-09-2 Methylene Chloride 0.986 0.02958 1.0E+02 1.3E+02 2.9E-10 4.7E-05
91-20-3 ~Naphthalene 0.672 0.02016 8.3E-02 6.3E-01 2.4E-07 6.4E-03
115-07-1 Propylene 26.1 0.783 -6.3E+02 2.5E-04
100-42-5 Styrene 0.977 0.02931 -2.1E+02 2.8E-05
127-18-4 Tetrachloroethylene 60.7 1.821 1.1E+01 8.3E+00 1.7E-07 4.4E-02
108-88-3 Toluene 11.9 0.357 -1.0E+03 6.8E-05
79-01-6 Trichloroethylene 0.715 0.02145 4.8E-01 4.2E-01 4.5E-08 1.0E-02
75-69-4 Trichlorofluoromethane 0.997 0.02991 --
95-63-6 Trimethylbenzene, 1,2,4-3.46 0.1038 -1.3E+01 1.7E-03
108-67-8 Trimethylbenzene, 1,3,5-1.68 0.0504 -1.3E+01 8.1E-04
108-05-4 Vinyl Acetate 2.3 0.069 -4.2E+01 3.3E-04
1330-20-7 Xylenes 10.6 0.318 -2.1E+01 3.0E-03
Cumulative: 8.1E-06 1.7E-01
All concentrations are in ug/m3
Output Form 3B
Carcinogenic risk and hazard quotient cells highlighted in orange are associated with non-volatile chemicals. Since these chemicals do not pose a vapor intrusion
risk, no risk values are calculated for these chemicals.
North Carolina DEQ Risk Calculator
DEQ Risk Calculator - Vapor Intrusion - Non-Residential Worker Soil Gas to Indoor Air
Version Date: January 2021
Basis: November 2020 EPA RSL Table
Site ID:
Exposure Unit ID: SG-5
CAS #Chemical Name:
Soil Gas
Concentration
(ug/m3)
Calculated
Indoor Air
Concentration
(ug/m3)
Target Indoor
Air Conc. for
Carcinogens @
TCR = 1E-06
Target Indoor Air
Conc. for Non-
Carcinogens @
THQ = 0.2
Calculated
Carcinogenic
Risk
Calculated
Non-
Carcinogenic
Hazard
Quotient
67-64-1 Acetone 37.9 0.379 -2.7E+04 2.8E-06
71-43-2 Benzene 3.69 0.0369 1.6E+00 2.6E+01 2.3E-08 2.8E-04
106-99-0 Butadiene, 1,3-2.97 0.0297 4.1E-01 1.8E+00 7.3E-08 3.4E-03
75-15-0 Carbon Disulfide 2.31 0.0231 -6.1E+02 7.5E-06
67-66-3 Chloroform 4.29 0.0429 5.3E-01 8.6E+01 8.0E-08 1.0E-04
74-87-3 Chloromethane 1.9 0.019 -7.9E+01 4.8E-05
110-82-7 Cyclohexane 4.25 0.0425 -5.3E+03 1.6E-06
106-93-4 Dibromoethane, 1,2-0.819 0.00819 2.0E-02 7.9E+00 4.0E-07 2.1E-04
75-71-8 Dichlorodifluoromethane 1.58 0.0158 -8.8E+01 3.6E-05
78-87-5 Dichloropropane, 1,2-0.791 0.00791 3.3E+00 3.5E+00 2.4E-09 4.5E-04
111-77-3 Ethanol, 2-(2-methoxyethoxy)-19.9 0.199 --
141-78-6 Ethyl Acetate 97.1 0.971 -6.1E+01 3.2E-03
100-41-4 Ethylbenzene 2.22 0.0222 4.9E+00 8.8E+02 4.5E-09 5.1E-06
109-99-9 ~Tetrahydrofuran 1.41 0.0141 -1.8E+03 1.6E-06
142-82-5 Heptane, N-2.89 0.0289 -3.5E+02 1.6E-05
110-54-3 Hexane, N-3.57 0.0357 -6.1E+02 1.2E-05
591-78-6 Hexanone, 2-2.29 0.0229 -2.6E+01 1.7E-04
67-63-0 Isopropanol 13 0.13 -1.8E+02 1.5E-04
78-93-3 Methyl Ethyl Ketone (2-Butanone)7.39 0.0739 -4.4E+03 3.4E-06
108-10-1 Methyl Isobutyl Ketone (4-methyl-2-pentanone) 39.7 0.397 -2.6E+03 3.0E-05
1634-04-4 Methyl tert-Butyl Ether (MTBE)0.811 0.00811 4.7E+01 2.6E+03 1.7E-10 6.2E-07
75-09-2 Methylene Chloride 0.986 0.00986 1.2E+03 5.3E+02 8.0E-12 3.8E-06
91-20-3 ~Naphthalene 0.672 0.00672 3.6E-01 2.6E+00 1.9E-08 5.1E-04
115-07-1 Propylene 26.1 0.261 -2.6E+03 2.0E-05
100-42-5 Styrene 0.977 0.00977 -8.8E+02 2.2E-06
127-18-4 Tetrachloroethylene 60.7 0.607 4.7E+01 3.5E+01 1.3E-08 3.5E-03
108-88-3 Toluene 11.9 0.119 -4.4E+03 5.4E-06
79-01-6 Trichloroethylene 0.715 0.00715 3.0E+00 1.8E+00 2.4E-09 8.2E-04
75-69-4 Trichlorofluoromethane 0.997 0.00997 --
95-63-6 Trimethylbenzene, 1,2,4-3.46 0.0346 -5.3E+01 1.3E-04
108-67-8 Trimethylbenzene, 1,3,5-1.68 0.0168 -5.3E+01 6.4E-05
108-05-4 Vinyl Acetate 2.3 0.023 -1.8E+02 2.6E-05
1330-20-7 Xylenes 10.6 0.106 -8.8E+01 2.4E-04
Cumulative: 6.2E-07 1.3E-02
All concentrations are in ug/m3
Output Form 3E
Carcinogenic risk and hazard quotient cells highlighted in orange are associated with non-volatile chemicals. Since these chemicals do not pose a vapor intrusion
risk, no risk values are calculated for these chemicals.
North Carolina DEQ Risk Calculator
Version Date:
Basis:
Site Name:
Site Address:
DEQ Section:
Site ID:
Exposure Unit ID:
Submittal Date:
Reviewed By:
SG-6
North Carolina Department of Environmental Quality
Risk Calculator
January 2021
November 2020 EPA RSL Table
Prepared By:Kevin Clay
Nolen Barefoot/Dan Nielsen
North Carolina DEQ Risk Calculator
DEQ Risk Calculator - Vapor Intrusion - Resident Soil Gas to Indoor Air
Version Date: January 2021
Basis: November 2020 EPA RSL Table
Site ID:
Exposure Unit ID: SG-6
CAS # Chemical Name:
Soil Gas
Concentration
(ug/m3)
Calculated
Indoor Air
Concentration
(ug/m3)
Target Indoor
Air Conc. for
Carcinogens @
TCR = 1E-06
Target Indoor Air
Conc. for Non-
Carcinogens @
THQ = 0.2
Calculated
Carcinogenic
Risk
Calculated
Non-
Carcinogenic
Hazard
Quotient
67-64-1 Acetone 41.1 1.233 -6.5E+03 3.8E-05
71-43-2 Benzene 17.6 0.528 3.6E-01 6.3E+00 1.5E-06 1.7E-02
106-99-0 Butadiene, 1,3-49.6 1.488 9.4E-02 4.2E-01 1.6E-05 7.1E-01
75-15-0 Carbon Disulfide 21.4 0.642 -1.5E+02 8.8E-04
67-66-3 Chloroform 1.95 0.0585 1.2E-01 2.0E+01 4.8E-07 5.7E-04
74-87-3 Chloromethane 2.1 0.063 -1.9E+01 6.7E-04
110-82-7 Cyclohexane 49.8 1.494 -1.3E+03 2.4E-04
106-93-4 Dibromoethane, 1,2-0.789 0.02367 4.7E-03 1.9E+00 5.1E-06 2.5E-03
75-71-8 Dichlorodifluoromethane 0.961 0.02883 -2.1E+01 2.8E-04
111-77-3 Ethanol, 2-(2-methoxyethoxy)-20.9 0.627 --
141-78-6 Ethyl Acetate 36.3 1.089 -1.5E+01 1.5E-02
100-41-4 Ethylbenzene 16.6 0.498 1.1E+00 2.1E+02 4.4E-07 4.8E-04
109-99-9 ~Tetrahydrofuran 3.19 0.0957 -4.2E+02 4.6E-05
142-82-5 Heptane, N-46.4 1.392 -8.3E+01 3.3E-03
110-54-3 Hexane, N-71.8 2.154 -1.5E+02 3.0E-03
591-78-6 Hexanone, 2-1.21 0.0363 -6.3E+00 1.2E-03
67-63-0 Isopropanol 12.2 0.366 -4.2E+01 1.8E-03
78-93-3 Methyl Ethyl Ketone (2-Butanone)11.6 0.348 -1.0E+03 6.7E-05
108-10-1 Methyl Isobutyl Ketone (4-methyl-2-pentanone) 27.9 0.837 -6.3E+02 2.7E-04
75-09-2 Methylene Chloride 3.93 0.1179 1.0E+02 1.3E+02 1.2E-09 1.9E-04
91-20-3 ~Naphthalene 0.547 0.01641 8.3E-02 6.3E-01 2.0E-07 5.2E-03
115-07-1 Propylene 2388 71.64 -6.3E+02 2.3E-02
100-42-5 Styrene 2.12 0.0636 -2.1E+02 6.1E-05
127-18-4 Tetrachloroethylene 66.2 1.986 1.1E+01 8.3E+00 1.8E-07 4.8E-02
108-88-3 Toluene 77.6 2.328 -1.0E+03 4.5E-04
79-01-6 Trichloroethylene 8.92 0.2676 4.8E-01 4.2E-01 5.6E-07 1.3E-01
75-69-4 Trichlorofluoromethane 1.14 0.0342 --
95-63-6 Trimethylbenzene, 1,2,4-18.8 0.564 -1.3E+01 9.0E-03
108-67-8 Trimethylbenzene, 1,3,5-7.03 0.2109 -1.3E+01 3.4E-03
75-01-4 Vinyl Chloride 0.494 0.01482 1.7E-01 2.1E+01 8.8E-08 1.4E-04
1330-20-7 Xylenes 82.7 2.481 -2.1E+01 2.4E-02
Cumulative: 2.4E-05 1.0E+00
All concentrations are in ug/m3
Output Form 3B
Carcinogenic risk and hazard quotient cells highlighted in orange are associated with non-volatile chemicals. Since these chemicals do not pose a vapor intrusion
risk, no risk values are calculated for these chemicals.
North Carolina DEQ Risk Calculator
DEQ Risk Calculator - Vapor Intrusion - Non-Residential Worker Soil Gas to Indoor Air
Version Date: January 2021
Basis: November 2020 EPA RSL Table
Site ID:
Exposure Unit ID: SG-6
CAS #Chemical Name:
Soil Gas
Concentration
(ug/m3)
Calculated
Indoor Air
Concentration
(ug/m3)
Target Indoor
Air Conc. for
Carcinogens @
TCR = 1E-06
Target Indoor Air
Conc. for Non-
Carcinogens @
THQ = 0.2
Calculated
Carcinogenic
Risk
Calculated
Non-
Carcinogenic
Hazard
Quotient
67-64-1 Acetone 41.1 0.411 -2.7E+04 3.0E-06
71-43-2 Benzene 17.6 0.176 1.6E+00 2.6E+01 1.1E-07 1.3E-03
106-99-0 Butadiene, 1,3-49.6 0.496 4.1E-01 1.8E+00 1.2E-06 5.7E-02
75-15-0 Carbon Disulfide 21.4 0.214 -6.1E+02 7.0E-05
67-66-3 Chloroform 1.95 0.0195 5.3E-01 8.6E+01 3.7E-08 4.5E-05
74-87-3 Chloromethane 2.1 0.021 -7.9E+01 5.3E-05
110-82-7 Cyclohexane 49.8 0.498 -5.3E+03 1.9E-05
106-93-4 Dibromoethane, 1,2-0.789 0.00789 2.0E-02 7.9E+00 3.9E-07 2.0E-04
75-71-8 Dichlorodifluoromethane 0.961 0.00961 -8.8E+01 2.2E-05
111-77-3 Ethanol, 2-(2-methoxyethoxy)-20.9 0.209 --
141-78-6 Ethyl Acetate 36.3 0.363 -6.1E+01 1.2E-03
100-41-4 Ethylbenzene 16.6 0.166 4.9E+00 8.8E+02 3.4E-08 3.8E-05
109-99-9 ~Tetrahydrofuran 3.19 0.0319 -1.8E+03 3.6E-06
142-82-5 Heptane, N-46.4 0.464 -3.5E+02 2.6E-04
110-54-3 Hexane, N-71.8 0.718 -6.1E+02 2.3E-04
591-78-6 Hexanone, 2-1.21 0.0121 -2.6E+01 9.2E-05
67-63-0 Isopropanol 12.2 0.122 -1.8E+02 1.4E-04
78-93-3 Methyl Ethyl Ketone (2-Butanone)11.6 0.116 -4.4E+03 5.3E-06
108-10-1 Methyl Isobutyl Ketone (4-methyl-2-pentanone) 27.9 0.279 -2.6E+03 2.1E-05
75-09-2 Methylene Chloride 3.93 0.0393 1.2E+03 5.3E+02 3.2E-11 1.5E-05
91-20-3 ~Naphthalene 0.547 0.00547 3.6E-01 2.6E+00 1.5E-08 4.2E-04
115-07-1 Propylene 2388 23.88 -2.6E+03 1.8E-03
100-42-5 Styrene 2.12 0.0212 -8.8E+02 4.8E-06
127-18-4 Tetrachloroethylene 66.2 0.662 4.7E+01 3.5E+01 1.4E-08 3.8E-03
108-88-3 Toluene 77.6 0.776 -4.4E+03 3.5E-05
79-01-6 Trichloroethylene 8.92 0.0892 3.0E+00 1.8E+00 3.0E-08 1.0E-02
75-69-4 Trichlorofluoromethane 1.14 0.0114 --
95-63-6 Trimethylbenzene, 1,2,4-18.8 0.188 -5.3E+01 7.2E-04
108-67-8 Trimethylbenzene, 1,3,5-7.03 0.0703 -5.3E+01 2.7E-04
75-01-4 Vinyl Chloride 0.494 0.00494 2.8E+00 8.8E+01 1.8E-09 1.1E-05
1330-20-7 Xylenes 82.7 0.827 -8.8E+01 1.9E-03
Cumulative: 1.8E-06 7.9E-02
All concentrations are in ug/m3
Output Form 3E
Carcinogenic risk and hazard quotient cells highlighted in orange are associated with non-volatile chemicals. Since these chemicals do not pose a vapor intrusion
risk, no risk values are calculated for these chemicals.
North Carolina DEQ Risk Calculator
Version Date:
Basis:
Site Name:
Site Address:
DEQ Section:
Site ID:
Exposure Unit ID:
Submittal Date:
Reviewed By:
SG-7
North Carolina Department of Environmental Quality
Risk Calculator
January 2021
November 2020 EPA RSL Table
Prepared By:Kevin Clay
Nolen Barefoot/Dan Nielsen
North Carolina DEQ Risk Calculator
DEQ Risk Calculator - Vapor Intrusion - Resident Soil Gas to Indoor Air
Version Date: January 2021
Basis: November 2020 EPA RSL Table
Site ID:
Exposure Unit ID: SG-7
CAS # Chemical Name:
Soil Gas
Concentration
(ug/m3)
Calculated
Indoor Air
Concentration
(ug/m3)
Target Indoor
Air Conc. for
Carcinogens @
TCR = 1E-06
Target Indoor Air
Conc. for Non-
Carcinogens @
THQ = 0.2
Calculated
Carcinogenic
Risk
Calculated
Non-
Carcinogenic
Hazard
Quotient
67-64-1 Acetone 30.8 0.924 -6.5E+03 2.9E-05
71-43-2 Benzene 4.46 0.1338 3.6E-01 6.3E+00 3.7E-07 4.3E-03
106-99-0 Butadiene, 1,3-9.54 0.2862 9.4E-02 4.2E-01 3.1E-06 1.4E-01
75-15-0 Carbon Disulfide 0.902 0.02706 -1.5E+02 3.7E-05
67-66-3 Chloroform 6.06 0.1818 1.2E-01 2.0E+01 1.5E-06 1.8E-03
74-87-3 Chloromethane 0.465 0.01395 -1.9E+01 1.5E-04
110-82-7 Cyclohexane 3.49 0.1047 -1.3E+03 1.7E-05
106-93-4 Dibromoethane, 1,2-0.822 0.02466 4.7E-03 1.9E+00 5.3E-06 2.6E-03
75-71-8 Dichlorodifluoromethane 1.64 0.0492 -2.1E+01 4.7E-04
78-87-5 Dichloropropane, 1,2-1.15 0.0345 7.6E-01 8.3E-01 4.5E-08 8.3E-03
111-77-3 Ethanol, 2-(2-methoxyethoxy)-29.4 0.882 --
141-78-6 Ethyl Acetate 9.18 0.2754 -1.5E+01 3.8E-03
100-41-4 Ethylbenzene 2.42 0.0726 1.1E+00 2.1E+02 6.5E-08 7.0E-05
109-99-9 ~Tetrahydrofuran 0.823 0.02469 -4.2E+02 1.2E-05
142-82-5 Heptane, N-2.44 0.0732 -8.3E+01 1.8E-04
110-54-3 Hexane, N-3.43 0.1029 -1.5E+02 1.4E-04
591-78-6 Hexanone, 2-3.01 0.0903 -6.3E+00 2.9E-03
67-63-0 Isopropanol 11.8 0.354 -4.2E+01 1.7E-03
78-93-3 Methyl Ethyl Ketone (2-Butanone)6.91 0.2073 -1.0E+03 4.0E-05
108-10-1 Methyl Isobutyl Ketone (4-methyl-2-pentanone) 36.5 1.095 -6.3E+02 3.5E-04
1634-04-4 Methyl tert-Butyl Ether (MTBE)0.619 0.01857 1.1E+01 6.3E+02 1.7E-09 5.9E-06
91-20-3 ~Naphthalene 0.75 0.0225 8.3E-02 6.3E-01 2.7E-07 7.2E-03
115-07-1 Propylene 64.1 1.923 -6.3E+02 6.1E-04
100-42-5 Styrene 1.24 0.0372 -2.1E+02 3.6E-05
127-18-4 Tetrachloroethylene 162 4.86 1.1E+01 8.3E+00 4.5E-07 1.2E-01
108-88-3 Toluene 9.41 0.2823 -1.0E+03 5.4E-05
75-69-4 Trichlorofluoromethane 1.02 0.0306 --
95-63-6 Trimethylbenzene, 1,2,4-4.48 0.1344 -1.3E+01 2.1E-03
108-67-8 Trimethylbenzene, 1,3,5-1.25 0.0375 -1.3E+01 6.0E-04
1330-20-7 Xylenes 10.8 0.324 -2.1E+01 3.1E-03
Cumulative: 1.1E-05 2.9E-01
All concentrations are in ug/m3
Output Form 3B
Carcinogenic risk and hazard quotient cells highlighted in orange are associated with non-volatile chemicals. Since these chemicals do not pose a vapor intrusion
risk, no risk values are calculated for these chemicals.
North Carolina DEQ Risk Calculator
DEQ Risk Calculator - Vapor Intrusion - Non-Residential Worker Soil Gas to Indoor Air
Version Date: January 2021
Basis: November 2020 EPA RSL Table
Site ID:
Exposure Unit ID: SG-7
CAS #Chemical Name:
Soil Gas
Concentration
(ug/m3)
Calculated
Indoor Air
Concentration
(ug/m3)
Target Indoor
Air Conc. for
Carcinogens @
TCR = 1E-06
Target Indoor Air
Conc. for Non-
Carcinogens @
THQ = 0.2
Calculated
Carcinogenic
Risk
Calculated
Non-
Carcinogenic
Hazard
Quotient
67-64-1 Acetone 30.8 0.308 -2.7E+04 2.3E-06
71-43-2 Benzene 4.46 0.0446 1.6E+00 2.6E+01 2.8E-08 3.4E-04
106-99-0 Butadiene, 1,3-9.54 0.0954 4.1E-01 1.8E+00 2.3E-07 1.1E-02
75-15-0 Carbon Disulfide 0.902 0.00902 -6.1E+02 2.9E-06
67-66-3 Chloroform 6.06 0.0606 5.3E-01 8.6E+01 1.1E-07 1.4E-04
74-87-3 Chloromethane 0.465 0.00465 -7.9E+01 1.2E-05
110-82-7 Cyclohexane 3.49 0.0349 -5.3E+03 1.3E-06
106-93-4 Dibromoethane, 1,2-0.822 0.00822 2.0E-02 7.9E+00 4.0E-07 2.1E-04
75-71-8 Dichlorodifluoromethane 1.64 0.0164 -8.8E+01 3.7E-05
78-87-5 Dichloropropane, 1,2-1.15 0.0115 3.3E+00 3.5E+00 3.5E-09 6.6E-04
111-77-3 Ethanol, 2-(2-methoxyethoxy)-29.4 0.294 --
141-78-6 Ethyl Acetate 9.18 0.0918 -6.1E+01 3.0E-04
100-41-4 Ethylbenzene 2.42 0.0242 4.9E+00 8.8E+02 4.9E-09 5.5E-06
109-99-9 ~Tetrahydrofuran 0.823 0.00823 -1.8E+03 9.4E-07
142-82-5 Heptane, N-2.44 0.0244 -3.5E+02 1.4E-05
110-54-3 Hexane, N-3.43 0.0343 -6.1E+02 1.1E-05
591-78-6 Hexanone, 2-3.01 0.0301 -2.6E+01 2.3E-04
67-63-0 Isopropanol 11.8 0.118 -1.8E+02 1.3E-04
78-93-3 Methyl Ethyl Ketone (2-Butanone)6.91 0.0691 -4.4E+03 3.2E-06
108-10-1 Methyl Isobutyl Ketone (4-methyl-2-pentanone) 36.5 0.365 -2.6E+03 2.8E-05
1634-04-4 Methyl tert-Butyl Ether (MTBE)0.619 0.00619 4.7E+01 2.6E+03 1.3E-10 4.7E-07
91-20-3 ~Naphthalene 0.75 0.0075 3.6E-01 2.6E+00 2.1E-08 5.7E-04
115-07-1 Propylene 64.1 0.641 -2.6E+03 4.9E-05
100-42-5 Styrene 1.24 0.0124 -8.8E+02 2.8E-06
127-18-4 Tetrachloroethylene 162 1.62 4.7E+01 3.5E+01 3.4E-08 9.2E-03
108-88-3 Toluene 9.41 0.0941 -4.4E+03 4.3E-06
75-69-4 Trichlorofluoromethane 1.02 0.0102 --
95-63-6 Trimethylbenzene, 1,2,4-4.48 0.0448 -5.3E+01 1.7E-04
108-67-8 Trimethylbenzene, 1,3,5-1.25 0.0125 -5.3E+01 4.8E-05
1330-20-7 Xylenes 10.8 0.108 -8.8E+01 2.5E-04
Cumulative: 8.4E-07 2.3E-02
All concentrations are in ug/m3
Output Form 3E
Carcinogenic risk and hazard quotient cells highlighted in orange are associated with non-volatile chemicals. Since these chemicals do not pose a vapor intrusion
risk, no risk values are calculated for these chemicals.
North Carolina DEQ Risk Calculator