HomeMy WebLinkAbout20089_Hendrick Durham Collision Center_Soil Gas Report_20170419_MAA
April 19, 2017
Mr. Eric Applefield
Southern Apartment Group, LLC
1435 West Morehead Street, Suite 130
Charlotte, North Carolina 28208
Subject: SOIL GAS SAMPLING LETTER REPORT
FORMER HENDRICK COLLISION CENTER
510 EAST PETTIGREW STREET
DURHAM, DURHAM COUNTY, NORTH CAROLINA
BROWNFIELDS PROJECT NUMBER 20089-16-32
MID-ATLANTIC JOB NUMBER: R2698.01 TASK 40000
Dear Mr. Applefield:
Mid-Atlantic Associates, Inc. is pleased to present this Soil Gas Sampling Letter Report
for the above-referenced site. The sampling was conducted in general accordance with
Mid-Atlantic Proposal 000R2698.01 dated January 24, 2017.
The subject site is located in a commercial area of Durham, North Carolina between S.
Dillard Street and Fayetteville Road on the west side of the street. The site is the parcel
at 510 East Pettigrew Street, which totals 2.166 acres of land and is assigned Parcel ID
Number 0831-13-04-2968 according to the Durham County Tax Administration Office.
This site was formerly part of the Hendrick Durham Auto Mall and is being evaluated for
potential soil-gas issues as part of redevelopment under Brownfields Project Number
20089-16-32. A soil-gas sample was collected on this parcel as part of an earlier
assessment by ECS Carolinas, LLP (ECS), and the laboratory analytical data yielded a
result that was in excess of the IHSB Vapor Intrusion Residential Screening Level for 1,4-
dichlorobenzene. At the request of the North Carolina Brownfileds Program (NCBFP) Mid-
Atlantic developed a Soil Gas Sampling Work Plan for the subject site. The Soil Gas
Sampling Work Plan was accepted by the NCBFP on February 20, 2017 and outlined a
plan for collecting four deeper soil-gas samples at the subject site in general accordance
with the North Carolina Department of Environment and Natural Resources, Division of
Waste Management, Vapor Intrusion Guidance (April 2014). This report documents the
results of these activities.
The attached drawing shows the location of the ECS sub-slab soil gas sample location
and the four deeper soil gas sample locations used for this assessment. The four soil gas
Letter Report of Soil Gas Sampling April 19, 2017
Former Hendrick Collison Center Page 2
Durham, North Carolina
sample locations (SG-A, SG-B, SG-C, SG-D) are located where current development
plans indicate that occupied building space will be constructed, (e.g. not parking areas).
At each soil-gas location, the pavement was removed and cleared from the boring
location and a boring was advanced to a depth of six to seven feet below land surface
using a direct push drill rig. One-quarter inch outer diameter Nylon tubing was inserted
into each boring to within four inches of the bottom of the boring. A filter tip was placed
on the tip of the tubing and a sand pack was installed around the filter tip and tubing
approximately one foot from the bottom of the boring. A six-inch thick hydrated bentonite
seal was installed above the sand pack. The assembly was leak tested prior to sampling.
A laboratory supplied summa canister was attached to the tubing to collect a soil gas
sample. Air within the nylon tubing and sand pack was purged prior to sample collection.
Each sample was submitted to Con-Test Analytical Laboratory, Inc. (Con-Test) in East
Longmeadow, Massachusetts for analysis using EPA Method TO-15.
LABORATORY ANALYTICAL RESULTS
The laboratory analytical report and chain-of-custody record for the soil gas samples
collected during the March 22, 2017 sampling event are provided in Appendix A and
summarized in Table 1. The soil gas analytical results were initially compared to the North
Carolina Department of Environmental Quality (NCDEQ) Division of Waste Management
(DWM) Residential and Non-Residential Vapor Intrusion Exterior Soil Gas Screening Levels
October 2016 Table (SGSLs).
Risk Calculation Methodology
The DWM establishes vapor intrusion SGSLs for individual compounds for residential and
non-residential (industrial/commercial) exposure scenarios. The DWM allows a maximum
cancer risk sum for all carcinogens of 1.0E-05 and a maximum cumulative hazard index (HI)
of 1.0 for all non-carcinogens in soil gas. Samples above these values require additional
assessment to evaluate the potential for vapor intrusion. The HI is the sum of the hazard
quotient (HQs) calculated for each compound detected above the reporting limit.
Mid-Atlantic initially compared the sub-slab sampling results to DWM residential SGSLs and
then calculated the cancer risk and non-cancer risk hazard quotient for each compound
detected above the laboratory reporting limit. Cancer risk sums and cumulative non-cancer
hazard indexes were then determined for each sample. Residential scenario risk
calculations for the exterior soil gas samples are summarized in Table 2 and discussed
below.
Sub-Slab Soil Gas Sampling Results
As summarized in Table 2, due to a dilution factor of 20, laboratory reporting limits were too
high to compare analytical results to the DWM residential SGSLs for 1,2-dibromoethane
Letter Report of Soil Gas Sampling April 19, 2017
Former Hendrick Collison Center Page 3
Durham, North Carolina
(EDB) and 1,1,2-trichloroethane at the sample collected at SG-D. 1,4-dichlorobenzene was
not detected above the laboratory method detection limits in any of the samples collected
during the March 22, 2017 soil gas assessment. A discussion of the laboratory results and
risk calculations for each sample follows.
SG-A
As summarized in Table 1, the sample collected from SG-A exhibited concentrations of 1,3-
butadiene and tetrachloroethylene (PCE) at concentrations above the DWM residential
SGSLs. The residential cancer risk sum for sample SG-A was 2.2E-05 (Table 2), which is
above the target cancer risk sum of 1.0E-05. The residential cumulative non-cancer hazard
index for sample SG-A was 1.3E+00 which is above the target cumulative non-cancer
hazard index of 1.0.
SG-B
As summarized in Table 1, the sample collected from SG-B exhibited concentrations of 1,3-
butadiene and 1,2,4-trimethylbenzene at concentrations above the DWM residential
SGSLs. The residential cancer risk sum for sample SG-B was 1.7E-05 (Table 2), which is
above the target cancer risk sum of 1.0E-05. The residential cumulative non-cancer hazard
index for sample SG-B was 7.20E-01 which is below the target cumulative non-cancer
hazard index of 1.0.
SG-C
As summarized in Table 1, the sample collected from SG-C did not exhibit constituent
concentrations above the DWM residential SGSLs. The residential cancer risk sum for
sample SG-C was 4.5E-06 (Table 2), which is below the target cancer risk sum of 1.0E-05.
The residential cumulative non-cancer hazard index for sample SG-C was 3.2E-01 which is
less than the target cumulative non-cancer hazard index of 1.0.
SG-D
As summarized in Table 1, the sample collected from SG-D exhibited concentrations of 1,3-
butadiene, ethylbenzene, 1,2,4-trimethylbenzene, m&p xylenes, and o-xylenes at
concentrations above the DWM residential SGSLs. The concentration of m&p xylenes
detected in the sample also exceeds the non-residential SGSL. Because the laboratory
reporting limits for EDB and 1,1,2-trichloroethane exceeded the SGSLs, the values of the
laboratory reporting limits were used in the risk calculations. The residential cancer risk sum
for sample SG-D was 8.3E-05 (Table 2), which is above the target cancer risk sum of 1.0E-
05. The residential cumulative non-cancer hazard index for sample SG-D was 5.2E+00
which is above the target cumulative non-cancer hazard index of 1.0.
Letter Report of Soil Gas Sampling April 19, 2017
Former Hendrick Collison Center Page 4
Durham, North Carolina
CONCLUSIONS AND RECOMMENDATIONS
The March 2017 Vapor Intrusion Assessment activities are summarized as follows:
In accordance with the NCBFP approved Work Plan four exterior soil gas samples
(SG-A through SG-D) were collected from the areas of the subject site that are
currently planned for development of residential structures;
Several compounds were detected in the exterior soil gas samples at concentrations
exceeding the initial DWM residential SGSLs including 1,3-butadiene, ethylbenzene,
PCE, 1,2,4-trimethylbenzene, and xylene (m&p and o); and
The residential cancer risk sums for the samples collected at SG-A, SG-B, and SG-
D exceed the target cancer risk sum of 1.0E-05. The residential cumulative non-
cancer hazard indexes also exceeded the target cumulative non-cancer hazard index
of 1.0 in the samples collected at SG-A and SG-D.
The objective of this investigation was to assess the degree and extent of potential soil-gas
contamination at the subject site. Mid-Atlantic recommends a copy of this report be
submitted to the North Carolina Brownfields Program. Based on the data collected Mid-
Atlantic considers it likely that the North Carolina Brownfields program will require vapor
intrusion mitigation measures for new residential construction at the site.
We appreciate the opportunity to present this report to Southern Apartment Group, LLC. If
you have any questions or need additional information, please feel free to contact us at 919-
250-9918.
Sincerely,
MID-ATLANTIC ASSOCIATES, INC.
Gregory L. Hutchins Daniel H. Nielsen, PE
Staff Scientist
Principal Engineer
Attachment: Drawing
Tables
Laboratory Report
DRAWING
!A
!A!A
!A
!A
!A
!A
!A
´
SOIL GAS SAMPLE LOCATION MAP FORMER COLLISION CENTER510 EAST PETTIGREW STREETDURHAM, NORTH CAROLINABROWNFIELDS PROJECT NO.: 20089-16-32
DRAWN BY:
DRAFT CHECK BY:
ENGINEER CHECK BY:
APPROVED BY:
DATE: APRIL 2017
JOB NO.: 000R2698.01
GIS NO.: 4G-R2698.01 T40000
DRAWING NO.: 2
REFERENCE: 2013 AERIAL IMAGERY FROM NC ONE MAPS. PROPERTY BOUNDARY AND ROAD GIS FROM DURHAM COUNTY GIS. ECS SUB-SLAB SAMPLE LOCATION DATA FROM ECS CAROLINAS SOIL-GAS SAMPLE LOCATION MAP.
LEGEND
!A MID-ATLANTIC SOIL GAS SAMPLE LOCATION
!A ECS SUB-SLAB SAMPLE LOCATION
PLANNED BUILDING LOCATIONSSUBJECT SITE
0 60 120 180Feet
1:720
JACKIE
R
O
B
I
N
S
O
N
SG-1
A
B
C
D E PETT
IGREW
S
T
TABLES
TABLE 1
SUMMARY OF CHEMICAL CONSTITUENTS DETECTED IN EXTERIOR SOIL GAS
FORMER HENDRICK COLLISION CENTER
DURHAM, NORTH CAROLINA
MID-ATLANTIC JOB NO. 000R2698.01 T40000
Residential
Vapor Intrusion
Screening Levels
Non-Residential
Vapor Intrusion
Screening Levels
SG-A SG-B SG-C SG-D Residential Soil-
Gas ug/m3
Non-Residential
Soil-Gas ug/m3
Sampling Date 3/22/2017 11:49 AM 3/22/2017 11:17 AM 3/22/2017 12:19 PM 3/22/2017 10:49 AM
Sample Depth - Feet - Feet - Feet - Feet
EPA TO-15
Acetone 130 150 V-06 ND (6.6)120 V-06 216000 2720000
Benzene 44 46 23 36 120 1570
Benzyl Chloride ND (0.50)ND (0.20)ND (0.20)ND (1.0)6.95 87.6
Bromodichloromethane ND (0.73)ND (0.29)ND (0.29)ND (1.5)21.9 331
Bromoform ND (0.99)ND (0.40)ND (0.40)ND (2.0)~~
Bromomethane ND (1.3)ND (0.53)ND (0.53)ND (2.7)34.8 438
1,3-Butadiene 20 19 ND (0.23)27 13.9 175
2-Butanone (MEK)38 J 55 35 66 J 34800 438000
Carbon Disulfide 27 13 25 ND (1.1)4870 61300
Carbon Tetrachloride ND (0.76)0.81 J 0.45 J ND (1.5)156 2040
Chlorobenzene ND (0.80)ND (0.32)ND (0.32)ND (1.6)348 4380
Chloroethane 49 7.3 4.0 ND (1.0)69500 876000
Chloroform 2.0 J 1.8 1.0 ND (1.1)40.7 533
Chloromethane 200 84 28 10 626 7880
Cyclohexane 13 14 86 8.9 41700 526000
Dibromochloromethane ND (1.1)ND (0.45)ND (0.45)ND (2.3)34.7 454
1,2-Dibromoethane (EDB)ND (0.86)ND (0.34)ND (0.34)ND (1.7)1.56 20.4
1,2-Dichlorobenzene ND (0.80)ND (0.32)ND (0.32)ND (1.6)1390 17500
1,3-Dichlorobenzene ND (0.67)ND (0.27)ND (0.27)ND (1.3)~~
1,4-Dichlorobenzene ND (0.76)ND (0.30)ND (0.30)ND (1.5)73.7 1110
Dichlorodifluoromethane (Freon 12)2.4 J 2.9 2.6 2.3 J 695 8760
1,1-Dichloroethane ND (0.57)ND (0.23)ND (0.23)ND (1.1)507 7670
1,2-Dichloroethane ND (0.56)ND (0.23)ND (0.23)ND (1.1)36 472
1,1-Dichloroethylene ND (0.48)ND (0.19)ND (0.19)ND (0.97)1390 17500
cis-1,2-Dichloroethylene ND (0.75)ND (0.30)ND (0.30)ND (1.5)~~
trans-1,2-Dichloroethylene ND (0.52)ND (0.21)ND (0.21)ND (1.0)417 5260
1,2-Dichloropropane ND (0.80)ND (0.32)ND (0.32)ND (1.6)27.8 350
cis-1,3-Dichloropropene ND (0.60)ND (0.24)ND (0.24)ND (1.2)~~
trans-1,3-Dichloropropene ND (0.61)ND (0.24)ND (0.24)ND (1.2)~~
1,2-Dichloro-1,1,2,2-tetrafluoroethane (Freon 114)ND (0.83)ND (0.33)ND (0.33)ND (1.7)~~
1,4-Dioxane ND (12)ND (4.6)ND (4.6)ND (23)~~
Ethanol 80 21 13 J 34 J ~~
Ethyl Acetate ND (1.3)ND (0.54)3.7 ND (2.7)~~
Ethylbenzene 23 32 34 2200 374 4910
4-Ethyltoluene 8.3 9.5 6.6 23 ~~
Heptane 48 52 33 46 ~~
Hexachlorobutadiene ND (2.0)ND (0.80)ND (0.80)ND (4.0)~~
Hexane 96 79 46 51 J 4870 61300
2-Hexanone (MBK)ND (0.52)17 ND (0.21)ND (1.0)209 2630
Isopropanol 8.4 J 9.3 J 3.4 J ND (3.0)~~
Methyl tert-Butyl Ether (MTBE)0.76 J 2.0 20 ND (1.1)3600 47200
Methylene Chloride ND (2.1)1.7 J ND (0.84)ND (4.2)4170 52600
4-Methyl-2-pentanone (MIBK)9.4 19 11 14 20900 263000
Naphthalene 6.6 7.9 V-06 2.3 V-06 4.8 J, V-06 20.9 263
Propene 43 ND (1.1)230 410 20900 263000
Styrene 16 14 2.0 27 6950 87600
1,1,2,2-Tetrachloroethane ND (0.82)ND (0.33)ND (0.33)ND (1.6)16.1 211
Tetrachloroethylene 860 12 1.3 J 2.0 J 278 3500
Tetrahydrofuran ND (0.62)1.4 ND (0.25)ND (1.2)13900 175000
Toluene 170 230 120 270 34800 438000
1,2,4-Trichlorobenzene ND (1.4)ND (0.56)ND (0.56)ND (2.8)13.9 175
1,1,1-Trichloroethane ND (0.49)ND (0.20)ND (0.20)ND (0.98)34800 438000
1,1,2-Trichloroethane ND (0.83)ND (0.33)ND (0.33)ND (1.7)1.39 17.5
Trichloroethylene 13 0.39 J ND (0.32)ND (1.6)13.9 175
Trichlorofluoromethane 2.1 J 1.7 J 0.79 J ND (2.0)4870 61300
1,1,2-Trichloro-1,2,2-trifluoroethane (Freon 113)1.7 J 0.92 J 0.55 J ND (2.1)209000 2630000
1,2,4-Trimethylbenzene ND (0.60)52 47 110 48.7 613
1,3,5-Trimethylbenzene 6.8 7.0 6.9 17 ~~
Vinyl Acetate ND (0.89)ND (0.36)ND (0.36)ND (1.8)1390 17500
Vinyl Chloride 27 13 2.7 ND (1.1)55.9 2790
Xylene, m&p 89 120 150 9800 695 8760
Xylene, o-30 37 61 4000 695 8760
NOTES:
1. ND = Not detected above the lab reporting limits shown in parenthesis.
2. NT = Not tested.
3. ~ = No IHSB Residential or Non-Residential screening limits limits.
4. Values in italics exceed the IHSB Residential Indoor Air Screening Limits.
5. Bold values exceed the IHSB Non-Residential Indoor Air Screening Limits.
6. Yellow Shaded values exceed the IHSB Residential Soil-Gas Screening Limits.
7. Red Shaded values exceed the IHSB Non-Residential Soil-Gas Screening Limits.
Parameter
SAMPLING LOCATION
TABLE 2
SUMMARY OF RISK CALCULATIONS: SG-A
FORMER HENDRICK COLLISION CENTERDURHAM, NORTH CAROLINA MID-ATLANTIC JOB NO. 000R2698.01 T40000
DEQ Risk Calculator - Vapor Intrusion - Resident Soil Gas to Indoor Air
Site ID: Hendrick Collision Center
Exposure Unit ID: SG-A
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 130 3.9 -6.5E+03 1.2E-04
71-43-2 Benzene 44 1.32 3.6E-01 6.3E+00 3.7E-06 4.2E-02
106-99-0 Butadiene, 1,3-20 0.6 9.4E-02 4.2E-01 6.4E-06 2.9E-01
75-15-0 Carbon Disulfide 27 0.81 -1.5E+02 1.1E-03
67-66-3 Chloroform 2 0.06 1.2E-01 2.0E+01 4.9E-07 5.9E-04
74-87-3 Chloromethane 200 6 -1.9E+01 6.4E-02
110-82-7 Cyclohexane 13 0.39 -1.3E+03 6.2E-05
75-71-8 Dichlorodifluoromethane 2.4 0.072 -2.1E+01 6.9E-04
75-00-3 Ethyl Chloride (Chloroethane)49 1.47 -2.1E+03 1.4E-04
100-41-4 Ethylbenzene 23 0.69 1.1E+00 2.1E+02 6.1E-07 6.6E-04
110-54-3 Hexane, N-96 2.88 -1.5E+02 3.9E-03
67-63-0 Isopropanol 8.4 0.252 -4.2E+01 1.2E-03
78-93-3 Methyl Ethyl Ketone (2-Butanone)38 1.14 -1.0E+03 2.2E-04
108-10-1 Methyl Isobutyl Ketone (4-methyl-2-pentanone)9.4 0.282 -6.3E+02 9.0E-05
1634-04-4 Methyl tert-Butyl Ether (MTBE)0.76 0.0228 1.1E+01 6.3E+02 2.1E-09 7.3E-06
91-20-3 ~Naphthalene 6.6 0.198 8.3E-02 6.3E-01 2.4E-06 6.3E-02
115-07-1 Propylene 43 1.29 -6.3E+02 4.1E-04
100-42-5 Styrene 16 0.48 -2.1E+02 4.6E-04
127-18-4 Tetrachloroethylene 860 25.8 1.1E+01 8.3E+00 2.4E-06 6.2E-01
108-88-3 Toluene 170 5.1 -1.0E+03 9.8E-04
76-13-1 Trichloro-1,2,2-trifluoroethane, 1,1,2-1.7 0.051 -6.3E+03 1.6E-06
79-01-6 Trichloroethylene 13 0.39 4.8E-01 4.2E-01 8.2E-07 1.9E-01
75-69-4 Trichlorofluoromethane 2.1 0.063 --
108-67-8 Trimethylbenzene, 1,3,5-6.8 0.204 --
75-01-4 Vinyl Chloride 27 0.81 1.7E-01 2.1E+01 4.8E-06 7.8E-03
1330-20-7 Xylenes 119 3.57 -2.1E+01 3.4E-02
Cumulative:2.2E-05 1.3E+00
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.
All concentrations are in ug/m3
North Carolina DEQ Risk Calculator
August 2016 VersionBasis: May 2016 EPA RSL Table
TABLE 2
SUMMARY OF RISK CALCULATIONS: SG-B
FORMER HENDRICK COLLISION CENTERDURHAM, NORTH CAROLINA
MID-ATLANTIC JOB NO. 000R2698.01 T40000
DEQ Risk Calculator - Vapor Intrusion - Resident Soil Gas to Indoor Air
Site ID: Hendrick Collision Center
Exposure Unit ID: SG-B
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 150 4.5 -6.5E+03 1.4E-04
71-43-2 Benzene 46 1.38 3.6E-01 6.3E+00 3.8E-06 4.4E-02
106-99-0 Butadiene, 1,3-19 0.57 9.4E-02 4.2E-01 6.1E-06 2.7E-01
75-15-0 Carbon Disulfide 13 0.39 -1.5E+02 5.3E-04
56-23-5 Carbon Tetrachloride 0.81 0.0243 4.7E-01 2.1E+01 5.2E-08 2.3E-04
67-66-3 Chloroform 1.8 0.054 1.2E-01 2.0E+01 4.4E-07 5.3E-04
74-87-3 Chloromethane 84 2.52 -1.9E+01 2.7E-02
110-82-7 Cyclohexane 14 0.42 -1.3E+03 6.7E-05
75-71-8 Dichlorodifluoromethane 2.9 0.087 -2.1E+01 8.3E-04
75-00-3 Ethyl Chloride (Chloroethane)7.3 0.219 -2.1E+03 2.1E-05
100-41-4 Ethylbenzene 32 0.96 1.1E+00 2.1E+02 8.5E-07 9.2E-04
110-54-3 Hexane, N-79 2.37 -1.5E+02 3.2E-03
591-78-6 Hexanone, 2-17 0.51 -6.3E+00 1.6E-02
67-63-0 Isopropanol 9.3 0.279 -4.2E+01 1.3E-03
78-93-3 Methyl Ethyl Ketone (2-Butanone)55 1.65 -1.0E+03 3.2E-04
108-10-1 Methyl Isobutyl Ketone (4-methyl-2-pentanone)19 0.57 -6.3E+02 1.8E-04
1634-04-4 Methyl tert-Butyl Ether (MTBE)2 0.06 1.1E+01 6.3E+02 5.6E-09 1.9E-05
75-09-2 Methylene Chloride 1.7 0.051 1.0E+02 1.3E+02 5.0E-10 8.2E-05
91-20-3 ~Naphthalene 7.9 0.237 8.3E-02 6.3E-01 2.9E-06 7.6E-02
100-42-5 Styrene 14 0.42 -2.1E+02 4.0E-04
127-18-4 Tetrachloroethylene 12 0.36 1.1E+01 8.3E+00 3.3E-08 8.6E-03
108-88-3 Toluene 230 6.9 -1.0E+03 1.3E-03
76-13-1 Trichloro-1,2,2-trifluoroethane, 1,1,2-0.92 0.0276 -6.3E+03 8.8E-07
79-01-6 Trichloroethylene 0.39 0.0117 4.8E-01 4.2E-01 2.4E-08 5.6E-03
75-69-4 Trichlorofluoromethane 1.7 0.051 --
95-63-6 Trimethylbenzene, 1,2,4-52 1.56 -1.5E+00 2.1E-01
108-67-8 Trimethylbenzene, 1,3,5-7 0.21 --
75-01-4 Vinyl Chloride 13 0.39 1.7E-01 2.1E+01 2.3E-06 3.7E-03
1330-20-7 Xylenes 157 4.71 -2.1E+01 4.5E-02
Cumulative:1.7E-05 7.2E-01
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.
All concentrations are in ug/m3
North Carolina DEQ Risk CalculatorAugust 2016 Version
Basis: May 2016 EPA RSL Table
TABLE 2
SUMMARY OF RISK CALCULATIONS: SG-C
FORMER HENDRICK COLLISION CENTER
DURHAM, NORTH CAROLINA
MID-ATLANTIC JOB NO. 000R2698.01 T40000
DEQ Risk Calculator - Vapor Intrusion - Resident Soil Gas to Indoor Air
Site ID: Hendrick Collision Center
Exposure Unit ID: SG-C
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
71-43-2 Benzene 23 0.69 3.6E-01 6.3E+00 1.9E-06 2.2E-02
75-15-0 Carbon Disulfide 25 0.75 -1.5E+02 1.0E-03
56-23-5 Carbon Tetrachloride 0.45 0.0135 4.7E-01 2.1E+01 2.9E-08 1.3E-04
67-66-3 Chloroform 1 0.03 1.2E-01 2.0E+01 2.5E-07 2.9E-04
74-87-3 Chloromethane 28 0.84 -1.9E+01 8.9E-03
110-82-7 Cyclohexane 86 2.58 -1.3E+03 4.1E-04
75-71-8 Dichlorodifluoromethane 2.6 0.078 -2.1E+01 7.5E-04
141-78-6 Ethyl Acetate 3.7 0.111 -1.5E+01 1.5E-03
75-00-3 Ethyl Chloride (Chloroethane)4 0.12 -2.1E+03 1.2E-05
100-41-4 Ethylbenzene 34 1.02 1.1E+00 2.1E+02 9.1E-07 9.8E-04
110-54-3 Hexane, N-46 1.38 -1.5E+02 1.9E-03
67-63-0 Isopropanol 3.4 0.102 -4.2E+01 4.9E-04
78-93-3 Methyl Ethyl Ketone (2-Butanone)35 1.05 -1.0E+03 2.0E-04
108-10-1 Methyl Isobutyl Ketone (4-methyl-2-pentanone)11 0.33 -6.3E+02 1.1E-04
1634-04-4 Methyl tert-Butyl Ether (MTBE)20 0.6 1.1E+01 6.3E+02 5.6E-08 1.9E-04
91-20-3 ~Naphthalene 2.3 0.069 8.3E-02 6.3E-01 8.4E-07 2.2E-02
115-07-1 Propylene 230 6.9 -6.3E+02 2.2E-03
100-42-5 Styrene 2 0.06 -2.1E+02 5.8E-05
127-18-4 Tetrachloroethylene 1.3 0.039 1.1E+01 8.3E+00 3.6E-09 9.3E-04
108-88-3 Toluene 120 3.6 -1.0E+03 6.9E-04
76-13-1 Trichloro-1,2,2-trifluoroethane, 1,1,2-0.55 0.0165 -6.3E+03 5.3E-07
75-69-4 Trichlorofluoromethane 0.79 0.0237 --
95-63-6 Trimethylbenzene, 1,2,4-47 1.41 -1.5E+00 1.9E-01
108-67-8 Trimethylbenzene, 1,3,5-6.9 0.207 --
75-01-4 Vinyl Chloride 2.7 0.081 1.7E-01 2.1E+01 4.8E-07 7.8E-04
1330-20-7 Xylenes 211 6.33 -2.1E+01 6.1E-02
Cumulative:4.5E-06 3.2E-01
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.
All concentrations are in ug/m3
North Carolina DEQ Risk Calculator
August 2016 Version
Basis: May 2016 EPA RSL Table
TABLE 2
SUMMARY OF RISK CALCULATIONS: SG-D
FORMER HENDRICK COLLISION CENTER
DURHAM, NORTH CAROLINA
MID-ATLANTIC JOB NO. 000R2698.01 T40000
DEQ Risk Calculator - Vapor Intrusion - Resident Soil Gas to Indoor Air
Site ID: Hendrick Collision Center
Exposure Unit ID: SG-D
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 120 3.6 -6.5E+03 1.1E-04
71-43-2 Benzene 36 1.08 3.6E-01 6.3E+00 3.0E-06 3.5E-02
106-99-0 Butadiene, 1,3-27 0.81 9.4E-02 4.2E-01 8.7E-06 3.9E-01
74-87-3 Chloromethane 10 0.3 -1.9E+01 3.2E-03
110-82-7 Cyclohexane 8.9 0.267 -1.3E+03 4.3E-05
106-93-4 Dibromoethane, 1,2-1.7 0.051 4.7E-03 1.9E+00 1.1E-05 5.4E-03
75-71-8 Dichlorodifluoromethane 2.3 0.069 -2.1E+01 6.6E-04
100-41-4 Ethylbenzene 2200 66 1.1E+00 2.1E+02 5.9E-05 6.3E-02
110-54-3 Hexane, N-51 1.53 -1.5E+02 2.1E-03
78-93-3 Methyl Ethyl Ketone (2-Butanone)66 1.98 -1.0E+03 3.8E-04
108-10-1 Methyl Isobutyl Ketone (4-methyl-2-pentanone)14 0.42 -6.3E+02 1.3E-04
91-20-3 ~Naphthalene 4.8 0.144 8.3E-02 6.3E-01 1.7E-06 4.6E-02
115-07-1 Propylene 410 12.3 -6.3E+02 3.9E-03
100-42-5 Styrene 27 0.81 -2.1E+02 7.8E-04
127-18-4 Tetrachloroethylene 2 0.06 1.1E+01 8.3E+00 5.6E-09 1.4E-03
108-88-3 Toluene 270 8.1 -1.0E+03 1.6E-03
79-00-5 Trichloroethane, 1,1,2-1.7 0.051 1.8E-01 4.2E-02 2.9E-07 2.4E-01
95-63-6 Trimethylbenzene, 1,2,4-110 3.3 -1.5E+00 4.5E-01
108-67-8 Trimethylbenzene, 1,3,5-17 0.51 --
106-42-3 Xylene, P--2.1E+01
108-38-3 Xylene, m--2.1E+01
95-47-6 Xylene, o--2.1E+01
1330-20-7 Xylenes 13800 414 -2.1E+01 4.0E+00
Cumulative:8.3E-05 5.2E+00
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.
All concentrations are in ug/m3
North Carolina DEQ Risk Calculator
August 2016 Version
Basis: May 2016 EPA RSL Table
LABORATORY REPORT
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