18051_Raleigh_Residence_VI_Risk_Assess_Report_20160421

Aptus Management, PLLC
Environmental Management Solutions
April 21, 2016
Lebeed Kady VIA EMAIL: [e-mail]
Environmental Engineer
Brownfields Program
N.C. Division of Waste Management
Brownfields Program
217 West Jones Street
Raleigh, North Carolina 27603
Subject: VAPOR INTRUSION - PRELIMINARY RISK ASSESSMENT ADDENDUM
SALISBURY STREET HOTEL, LLC (RALEIGH RESIDENCE INN)
616 S. SALISBURY STREET, RALEIGH, NORTH CAROLINA
BROWNFIELDS PROJECT NO. 18051-14-092
Dear Mr. Kady:
On April 6, 2015, Aptus submitted a preliminary risk assessment for the Raleigh Residence Inn
site that found no unacceptable vapor intrusion (VI) risk and concluded no additional
assessment or mitigation was required. Given the site redevelopment considerations at that
time, the risk assessment was based on a commercial (non-residential) exposure scenario.
Your office concurred with our assessment findings on April 20, 2015.
The data used in the assessment (from an EPA-funded investigation for the City of Raleigh)
indicated no volatile organic compounds (VOCs) in groundwater that exceeded the DEQ’s
Division of Waste Management (NCDWM) non-residential vapor intrusion screening levels
(NRGWSLs), with the exception of 1,2-dichloroethane (1,2-DCA) at 150 ug/l in MW-8. The
NRGWSL for 1,2-DCA at that time was 97.8 ug/l (based on the June 2014 table), and it remains
the same under the current table (March 2016).
In response to recent conversations with your office about a possible land use restriction (LUR)
limiting the site to commercial use, we performed an additional risk assessment to evaluate the
residential exposure scenario (this Addendum). This was done to allow future flexibility for
residential development, which could include conversion of the hotel to condominiums.
Following the same general approach as our earlier assessment, groundwater data were
compared to the current March 2016 Residential Ground Water Screening Levels (RGWSLs)
and the risk assessment was done using the current OSWER Vapor Intrusion Assessment
Groundwater Concentration to Indoor Air Concentration (GWC-IAC) Calculator Version 3.45
(which employs the EPA’s November 2015 regional screening levels (RSLs) that the current
NCDWM tables are based upon). The current RGWSL for 1,2-DCA is 22.4 ug/l – which
represents a 4.4-fold decrease compared to the commercial NRGWSL.
Findings
We found that even using the more conservative residential exposure, an unacceptable risk
does not exist. Additionally, given the depth to groundwater at the site is approximately 50 feet,
we believe the assessment modeling is conservative and the potential for a VI issue is further
diminished.
Aptus Management, PLLC
109 Amber Court
Carrboro, NC 27510
Preliminary Risk Assessment Summary April 21, 2016
616 S. Salisbury Street, Raleigh, North Carolina
Aptus Management, PLLC Page 2
The residential exposure scenario results indicate that the cumulative cancer risk for MW-8 is
4.5E-05 and the cumulative non-cancer hazard quotient for the well is HQ=0.73. As before, 1,2-
DCE was the only contaminant found in groundwater to exceed the RGWSL, but each of the
detected analytes were included in the assessment (assuming all six chemicals have similar
critical health effects, inclusive of each of the above contaminants, plus di-isopropyl ether and
xylenes).
In our earlier assessment, no analytes from MW-7 exceeded their respective NRGWSLs.
However, 1,2-DCE in groundwater (72.0 ug/l) does exceed its RGWSL. As was the case for
MW-8, a risk calculation was performed for each of the contaminants detected in this well. The
cumulative cancer risk for MW-7 was found to be 2.4E-05 and the cumulative non-cancer
hazard quotient was HQ=0.64.
For both wells, the cumulative cancer risk was less than 1.0E-04 and the HQ was less than one.
Therefore, our assessment findings indicate that there is not an unacceptable VI risk for the
residential use scenario. Thus, according to current regulatory guidance, no additional
assessment or mitigation is required.
We hope that these updated risk assessment conclusions and recommendations will be
acceptable to the Brownfields Program. Please contact us at your convenience at (919) 636-
6812 if you would like to discuss this analysis or any other details regarding the site.
Sincerely,
APTUS MANAGEMENT, PLLC
Robert D. Hill, PE John Gallagher, PE
Principal Consultant Engineer of Record
Attachments: EPA OSWER VISL-Calc Risk Spreadsheet Printouts (MW-7 and MW-8)
NCDWM Residential Screening Level (March 2016)
cc: Tony Duque, Project Manager – NCDWM Brownfields Program
([e-mail])

Aptus Management, PLLC

ATTACHMENTS

Aptus Management, PLLC

OSWER VAPOR INTRUSION ASSESSMENT, GROUNDWATER
CONCENTRATION TO INDOOR AIR CONCENTRATION
(GWC-IAC) CALCULATOR VERSION 3.45, NOVEMBER 2015 RSLs
x OSWER VAPOR INTRUSION ASSESSMENT
x Groundwater Concentration to Indoor Air Concentration (GWC-IAC) Calculator Version 3.45, November 2015 RSLs
x
x Parameter Symbol Value Instructions
x Exposure Scenario Scenario Residential Select residential or commercial scenario from pull down list
x Target Risk for Carcinogens TCR 1.00E-06xTarget Hazard Quotient for Non-Carcinogens THQ 1
Average Groundwater Temperature (oC)Tgw 16.7 Enter average of the stabilized groundwater temperature to correct Henry's Law Constant for groundwater target concentrations
x
x
Site
Groundwater
Concentration
Calculated
Indoor Air
Concentration
VI
Carcinogenic
Risk
VI Hazard Inhalation Unit
Risk
Reference
Concentration
x Cgw Cia IUR RfC
x CAS Chemical Name (ug/L)(ug/m3)(ug/m3)-1 (mg/m3)i
x 71-43-2 Benzene 1.3 2.00E-01 5.6E-07 6.4E-03 15.9 7.80E-06 I 3.00E-02 I
x 67-66-3 Chloroform 0.5 5.22E-02 4.3E-07 5.1E-04 8.14 2.30E-05 I 9.80E-02 A
x 107-06-2 Dichloroethane, 1,2-72.0 2.31E+00 2.1E-05 3.2E-01 22.4 2.60E-05 I 7.00E-03 P
x 108-20-3 Diisopropyl Ether 2.3 2.41E-01 No IUR 3.3E-04 1390 7.00E-01 Px100-41-4 Ethylbenzene 7.5 1.48E+00 1.3E-06 1.4E-03 34.9 2.50E-06 CA 1.00E+00 Ix91-20-3 Naphthalene 3.0 2.90E-02 3.5E-07 9.3E-03 34.8 3.40E-05 CA 3.00E-03 Ix103-65-1 Propyl benzene 1.1 2.74E-01 No IUR 2.6E-04 486 1.00E+00 Xx127-18-4 Tetrachloroethylene 0.7 3.20E-01 3.0E-08 7.7E-03 11.5 2.60E-07 I 4.00E-02 Ix108-88-3 Toluene 8.7 1.52E+00 No IUR 2.9E-04 3840 5.00E+00 Ix79-01-6 Trichloroethylene 0.5 1.34E-01 2.8E-07 6.4E-02 1.04 see note I 2.00E-03 I TCE
x 95-63-6 Trimethylbenzene, 1,2,4-8.9 1.28E+00 No IUR 1.8E-01 5.8 7.00E-03 P
x 1330-20-7 Xylenes 39.0 6.46E+00 No IUR 6.2E-02 76.9 1.00E-01 I
x 2.4E-05
x Notes:6.4E-01
(1)Inhalation Pathway Exposure Parameters (RME):Units
Exposure Scenario Symbol Value Symbol Value Symbol Value
Averaging time for carcinogens (yrs)ATc_R_GW 70 ATc_C_GW 70 ATc_GW 70
Averaging time for non-carcinogens (yrs)ATnc_R_GW 26 ATnc_C_GW 25 Atnc_GW 26
Exposure duration (yrs)ED_R_GW 26 ED_C_GW 25 ED_GW 26Exposure frequency (days/yr)EF_R_GW 350 EF_C_GW 250 EF_GW 350Exposure time (hr/day)ET_R_GW 24 ET_C_GW 8 ET_GW 24
(2)Generic Attenuation Factors:
Source Medium of Vapors Symbol Value Symbol Value Symbol Value
Groundwater ( - )AFgw_R_GW 0.001 AFgw_C_GW 0.001 AFgw_GW 0.001
Sub-Slab and Exterior Soil Gas ( - )AFss_R_GW 0.03 AFss_C_GW 0.03 AFss_GW 0.03
(3)Formulas
Cia, target = MIN( Cia,c; Cia,nc)
Cia,c (ug/m3) = TCR x ATc x (365 days/yr) x (24 hrs/day) / (ED x EF x ET x IUR)
Cia,nc (ug/m3) = THQ x ATnc x (365 days/yr) x (24 hrs/day) x RfC x (1000 ug/mg) / (ED x EF x ET)
(4)Special Case Chemicals
Trichloroethylene Symbol Value Symbol Value Symbol Value
mIURTCE_R_GW 1.00E-06 mIURTCE_C_GW 0.00E+00 mIURTCE_GW 1.00E-06
IURTCE_R_GW 3.10E-06 IURTCE_C_GW 4.10E-06 IURTCE_GW 3.10E-06
Mutagenic Chemicals The exposure durations and age-dependent adjustment factors for mutagenic-mode-of-action are listed in the table below:
0 - 2 years 2
2 - 6 years 4
6 - 16 years 10
16 - 26 years 10
Mutagenic-mode-of-action (MMOA) adjustment factor This factor is used in the equations for mutagenic chemicals.
Vinyl Chloride See the Navigation Guide equation for Cia,c for vinyl chloride.
Notation:
I = IRIS: EPA Integrated Risk Information System (IRIS). Available online at: http://www.epa.gov/iris/subst/index.html
Sample MW-7 - 616 S Salisbury Street, Raleigh, NC
Cumulative Cancer Risk
Cumulative Non-Cancer Hazard Quotient
NCDENR
Residential
GWSL
Mutagenic
Indicator
CR HQ
Note: This section applies to trichloroethylene and other
mutagenic chemicals, but not to vinyl chloride.
Age Cohort Exposure
Duration Age-dependent adjustment
factor10
3
Enter target risk for carcinogens (for comparison to the calculated VI carcinogenic risk in column F)
Enter target hazard quotient for non-carcinogens (for comparison to the calculated VI hazard in column G)
3
1
72
Selected (based on
scenario)
Selected (based on
scenario)
Selected (based on
scenario)
Residential Commercial
Residential Commercial
Residential Commercial
RFC
Source*
IUR
Source*
VISL Calculator Version 3.4.5, November 2015 RSLs Page 1 of 2
x OSWER VAPOR INTRUSION ASSESSMENT
x Groundwater Concentration to Indoor Air Concentration (GWC-IAC) Calculator Version 3.45, November 2015 RSLs
x
x Parameter Symbol Value Instructions
x Exposure Scenario Scenario Residential Select residential or commercial scenario from pull down list
x Target Risk for Carcinogens TCR 1.00E-06xTarget Hazard Quotient for Non-Carcinogens THQ 1
Average Groundwater Temperature (oC)Tgw 16.7 Enter average of the stabilized groundwater temperature to correct Henry's Law Constant for groundwater target concentrations
x
x
Site
Groundwater
Concentration
Calculated
Indoor Air
Concentration
VI
Carcinogenic
Risk
VI Hazard Inhalation Unit
Risk
Reference
Concentration
x Cgw Cia IUR RfC
x CAS Chemical Name (ug/L)(ug/m3)(ug/m3)-1 (mg/m3)i
Sample MW-7 - 616 S Salisbury Street, Raleigh, NC
NCDENR
Residential
GWSL
Mutagenic
Indicator
CR HQ
Enter target risk for carcinogens (for comparison to the calculated VI carcinogenic risk in column F)
Enter target hazard quotient for non-carcinogens (for comparison to the calculated VI hazard in column G)
RFC
Source*
IUR
Source*
P = PPRTV. EPA Provisional Peer Reviewed Toxicity Values (PPRTVs). Available online at:http://hhpprtv.ornl.gov/pprtv.shtml
A = Agency for Toxic Substances and Disease Registry (ATSDR) Minimum Risk Levels (MRLs). Available online at:http://www.atsdr.cdc.gov/mrls/index.html
CA = California Environmental Protection Agency/Office of Environmental Health Hazard Assessment assessments. Available online at:http://www.oehha.ca.gov/risk/ChemicalDB/index.asp
H = HEAST. EPA Superfund Health Effects Assessment Summary Tables (HEAST) database. Available online at: http://epa-heast.ornl.gov/heast.shtml
S = See RSL User Guide, Section 5
X = PPRTV Appendix
Mut = Chemical acts according to the mutagenic-mode-of-action, special exposure parameters apply (see footnote (4) above).
VC = Special exposure equation for vinyl chloride applies (see Navigation Guide for equation).
TCE = Special mutagenic and non-mutagenic IURs for trichloroethylene apply (see footnote (4) above).
Yellow highlighting indicates site-specific parameters that may be edited by the user.
Blue highlighting indicates exposure factors that are based on Risk Assessment Guidance for Superfund (RAGS) or EPA vapor intrusion guidance, which generally should not be changed.
Pink highlighting indicates VI carcinogenic risk greater than the target risk for carcinogens (TCR) or VI Hazard greater than or equal to the target hazard quotient for non-carcinogens (THQ).
VISL Calculator Version 3.4.5, November 2015 RSLs Page 2 of 2
x OSWER VAPOR INTRUSION ASSESSMENT
x Groundwater Concentration to Indoor Air Concentration (GWC-IAC) Calculator Version 3.45, November 2015 RSLs
x
x Parameter Symbol Value Instructions
x Exposure Scenario Scenario Residential Select residential or commercial scenario from pull down list
x Target Risk for Carcinogens TCR 1.00E-06xTarget Hazard Quotient for Non-Carcinogens THQ 1
Average Groundwater Temperature (oC)Tgw 16.7 Enter average of the stabilized groundwater temperature to correct Henry's Law Constant for groundwater target concentrations
x
x
Site
Groundwater
Concentration
Calculated
Indoor Air
Concentration
VI
Carcinogenic
Risk
VI Hazard Inhalation Unit
Risk
Reference
Concentration
x Cgw Cia IUR RfC
x CAS Chemical Name (ug/L)(ug/m3)(ug/m3)-1 (mg/m3)i
x 71-43-2 Benzene ------15.9 7.80E-06 I 3.00E-02 I
x 67-66-3 Chloroform 0.5 5.22E-02 4.3E-07 5.1E-04 8.14 2.30E-05 I 9.80E-02 A
x 107-06-2 Dichloroethane, 1,2-150.0 4.81E+00 4.5E-05 6.6E-01 22.4 2.60E-05 I 7.00E-03 P
x 108-20-3 Diisopropyl Ether 2.2 2.30E-01 No IUR 3.2E-04 1390 7.00E-01 Px100-41-4 Ethylbenzene ------34.9 2.50E-06 CA 1.00E+00 Ix91-20-3 Naphthalene ------34.8 3.40E-05 CA 3.00E-03 Ix103-65-1 Propyl benzene ------486 1.00E+00 Xx127-18-4 Tetrachloroethylene 0.5 2.29E-01 2.1E-08 5.5E-03 11.5 2.60E-07 I 4.00E-02 Ix108-88-3 Toluene ------3840 5.00E+00 Ix79-01-6 Trichloroethylene 0.5 1.34E-01 2.8E-07 6.4E-02 1.04 see note I 2.00E-03 I TCE
x 95-63-6 Trimethylbenzene, 1,2,4-------5.8 7.00E-03 P
x 1330-20-7 Xylenes 1.6 2.65E-01 No IUR 2.5E-03 76.9 1.00E-01 I
x 4.5E-05
x Notes:7.3E-01
(1)Inhalation Pathway Exposure Parameters (RME):Units
Exposure Scenario Symbol Value Symbol Value Symbol Value
Averaging time for carcinogens (yrs)ATc_R_GW 70 ATc_C_GW 70 ATc_GW 70
Averaging time for non-carcinogens (yrs)ATnc_R_GW 26 ATnc_C_GW 25 Atnc_GW 26
Exposure duration (yrs)ED_R_GW 26 ED_C_GW 25 ED_GW 26Exposure frequency (days/yr)EF_R_GW 350 EF_C_GW 250 EF_GW 350Exposure time (hr/day)ET_R_GW 24 ET_C_GW 8 ET_GW 24
(2)Generic Attenuation Factors:
Source Medium of Vapors Symbol Value Symbol Value Symbol Value
Groundwater ( - )AFgw_R_GW 0.001 AFgw_C_GW 0.001 AFgw_GW 0.001
Sub-Slab and Exterior Soil Gas ( - )AFss_R_GW 0.03 AFss_C_GW 0.03 AFss_GW 0.03
(3)Formulas
Cia, target = MIN( Cia,c; Cia,nc)
Cia,c (ug/m3) = TCR x ATc x (365 days/yr) x (24 hrs/day) / (ED x EF x ET x IUR)
Cia,nc (ug/m3) = THQ x ATnc x (365 days/yr) x (24 hrs/day) x RfC x (1000 ug/mg) / (ED x EF x ET)
(4)Special Case Chemicals
Trichloroethylene Symbol Value Symbol Value Symbol Value
mIURTCE_R_GW 1.00E-06 mIURTCE_C_GW 0.00E+00 mIURTCE_GW 1.00E-06
IURTCE_R_GW 3.10E-06 IURTCE_C_GW 4.10E-06 IURTCE_GW 3.10E-06
Mutagenic Chemicals The exposure durations and age-dependent adjustment factors for mutagenic-mode-of-action are listed in the table below:
0 - 2 years 2
2 - 6 years 4
6 - 16 years 10
16 - 26 years 10
Mutagenic-mode-of-action (MMOA) adjustment factor This factor is used in the equations for mutagenic chemicals.
Vinyl Chloride See the Navigation Guide equation for Cia,c for vinyl chloride.
Notation:
I = IRIS: EPA Integrated Risk Information System (IRIS). Available online at: http://www.epa.gov/iris/subst/index.html
3
1
72
Selected (based on
scenario)
Selected (based on
scenario)
Selected (based on
scenario)
Residential Commercial
Residential Commercial
Residential Commercial
Note: This section applies to trichloroethylene and other
mutagenic chemicals, but not to vinyl chloride.
Age Cohort Exposure
Duration Age-dependent adjustment
factor10
3
Sample MW-8 - 616 S Salisbury Street, Raleigh, NC
Cumulative Cancer Risk
Cumulative Non-Cancer Hazard Quotient
NCDENR
Residential
GWSL
Mutagenic
Indicator
CR HQ
Enter target risk for carcinogens (for comparison to the calculated VI carcinogenic risk in column F)
Enter target hazard quotient for non-carcinogens (for comparison to the calculated VI hazard in column G)
RFC
Source*
IUR
Source*
VISL Calculator Version 3.4.5, November 2015 RSLs Page 1 of 2
x OSWER VAPOR INTRUSION ASSESSMENT
x Groundwater Concentration to Indoor Air Concentration (GWC-IAC) Calculator Version 3.45, November 2015 RSLs
x
x Parameter Symbol Value Instructions
x Exposure Scenario Scenario Residential Select residential or commercial scenario from pull down list
x Target Risk for Carcinogens TCR 1.00E-06xTarget Hazard Quotient for Non-Carcinogens THQ 1
Average Groundwater Temperature (oC)Tgw 16.7 Enter average of the stabilized groundwater temperature to correct Henry's Law Constant for groundwater target concentrations
x
x
Site
Groundwater
Concentration
Calculated
Indoor Air
Concentration
VI
Carcinogenic
Risk
VI Hazard Inhalation Unit
Risk
Reference
Concentration
x Cgw Cia IUR RfC
x CAS Chemical Name (ug/L)(ug/m3)(ug/m3)-1 (mg/m3)i
Sample MW-8 - 616 S Salisbury Street, Raleigh, NC
NCDENR
Residential
GWSL
Mutagenic
Indicator
CR HQ
Enter target risk for carcinogens (for comparison to the calculated VI carcinogenic risk in column F)
Enter target hazard quotient for non-carcinogens (for comparison to the calculated VI hazard in column G)
RFC
Source*
IUR
Source*
P = PPRTV. EPA Provisional Peer Reviewed Toxicity Values (PPRTVs). Available online at:http://hhpprtv.ornl.gov/pprtv.shtml
A = Agency for Toxic Substances and Disease Registry (ATSDR) Minimum Risk Levels (MRLs). Available online at:http://www.atsdr.cdc.gov/mrls/index.html
CA = California Environmental Protection Agency/Office of Environmental Health Hazard Assessment assessments. Available online at:http://www.oehha.ca.gov/risk/ChemicalDB/index.asp
H = HEAST. EPA Superfund Health Effects Assessment Summary Tables (HEAST) database. Available online at: http://epa-heast.ornl.gov/heast.shtml
S = See RSL User Guide, Section 5
X = PPRTV Appendix
Mut = Chemical acts according to the mutagenic-mode-of-action, special exposure parameters apply (see footnote (4) above).
VC = Special exposure equation for vinyl chloride applies (see Navigation Guide for equation).
TCE = Special mutagenic and non-mutagenic IURs for trichloroethylene apply (see footnote (4) above).
Yellow highlighting indicates site-specific parameters that may be edited by the user.
Blue highlighting indicates exposure factors that are based on Risk Assessment Guidance for Superfund (RAGS) or EPA vapor intrusion guidance, which generally should not be changed.
Pink highlighting indicates VI carcinogenic risk greater than the target risk for carcinogens (TCR) or VI Hazard greater than or equal to the target hazard quotient for non-carcinogens (THQ).
VISL Calculator Version 3.4.5, November 2015 RSLs Page 2 of 2

Aptus Management, PLLC

NORTH CAROLINA DIVISION OF WASTE MANAGEMENT
RESIDENTIAL VAPOR INTRUSION SCREENING LEVELS TABLE
MARCH 2016

DIVISION OF WASTE MANAGEMENT
RESIDENTIAL VAPOR INTRUSION SCREENING CONCENTRATIONS (March, 2016)
Attenuation Factor (AF) = 0.001 0.03 IASL (A)IASL (B)IASL (C)
TCR = 1.0E-06 TCR = 1.0E-05 TCR = 1.0E-04
THQ = 0.2 THQ = 0.2 THQ = 0.2
75-07-0 Acetaldehyde 6.88E+02 6.26E+01 NC 1.28E+00 C 1.88E+00 NC 1.88E+00 NC
67-64-1 Acetone 4.52E+06 2.16E+05 NC 6.47E+03 NC 6.47E+03 NC 6.47E+03 NC
75-05-8 Acetonitrile 8.87E+03 4.17E+02 NC 1.25E+01 NC 1.25E+01 NC 1.25E+01 NC
107-02-8 Acrolein 8.36E-01 1.39E-01 NC 4.17E-03 NC 4.17E-03 NC 4.17E-03 NC
79-10-7 Acrylic Acid 1.38E+04 6.95E+00 NC 2.09E-01 NC 2.09E-01 NC 2.09E-01 NC
107-13-1 Acrylonitrile 7.32E+01 1.38E+01 C 4.13E-02 C 4.13E-01 C 4.17E-01 NC
309-00-2 Aldrin 3.19E+00 1.91E-01 C 5.73E-04 C 5.73E-03 C 5.73E-02 C
107-18-6 Allyl Alcohol 1.02E+02 6.95E-01 NC 2.09E-02 NC 2.09E-02 NC 2.09E-02 NC
107-05-1 Allyl Chloride 4.64E-01 6.95E+00 NC 2.09E-01 NC 2.09E-01 NC 2.09E-01 NC
7664-41-7 Ammonia 3.17E+04 6.95E+02 NC 2.09E+01 NC 2.09E+01 NC 2.09E+01 NC
75-85-4 Amyl Alcohol, tert-1.11E+03 2.09E+01 NC 6.26E-01 NC 6.26E-01 NC 6.26E-01 NC
12674-11-2 Aroclor 1016 1.72E+02 4.68E+01 C 1.40E-01 C 1.40E+00 C 1.40E+01 C
11104-28-2 Aroclor 1221 5.28E+00 1.64E+00 C 4.93E-03 C 4.93E-02 C 4.93E-01 C
11141-16-5 Aroclor 1232 1.64E+00 1.64E+00 C 4.93E-03 C 4.93E-02 C 4.93E-01 C
53469-21-9 Aroclor 1242 3.51E+00 1.64E+00 C 4.93E-03 C 4.93E-02 C 4.93E-01 C
12672-29-6 Aroclor 1248 2.74E+00 1.64E+00 C 4.93E-03 C 4.93E-02 C 4.93E-01 C
11097-69-1 Aroclor 1254 4.26E+00 1.64E+00 C 4.93E-03 C 4.93E-02 C 4.93E-01 C
11096-82-5 Aroclor 1260 3.59E+00 1.64E+00 C 4.93E-03 C 4.93E-02 C 4.93E-01 C
103-33-3 Azobenzene 1.64E+03 3.02E+01 C 9.06E-02 C 9.06E-01 C 9.06E+00 C
56-55-3 Benz[a]anthracene Not sufficiently toxic or volatile Not sufficiently toxic or volatile C 9.22E-03 C 9.22E-02 C 9.22E-01 C
71-43-2 Benzene 1.59E+01 1.20E+02 C 3.60E-01 C 3.60E+00 C 6.26E+00 NC
100-44-7 Benzyl Chloride 1.24E+01 6.95E+00 NC 5.73E-02 C 2.09E-01 NC 2.09E-01 NC
92-52-4 Biphenyl, 1,1'-6.63E+00 2.78E+00 NC 8.34E-02 NC 8.34E-02 NC 8.34E-02 NC
111-44-4 Bis(2-chloroethyl)ether 1.22E+02 2.84E+00 C 8.51E-03 C 8.51E-02 C 8.51E-01 C
542-88-1 Bis(chloromethyl)ether 2.54E-03 1.51E-02 C 4.53E-05 C 4.53E-04 C 4.53E-03 C
10294-34-5 Boron Trichloride No Solubility 1.39E+02 NC 4.17E+00 NC 4.17E+00 NC 4.17E+00 NC
7637-07-2 Boron Trifluoride No Henrys Law Constant 9.04E+01 NC 2.71E+00 NC 2.71E+00 NC 2.71E+00 NC
107-04-0 Bromo-2-chloroethane, 1-1.26E+00 1.56E+00 C 4.68E-03 C 4.68E-02 C 4.68E-01 C
Tox Basis
Note: The Residential screening level below or site specific screening concentrations (utilizing site specific attenuation and exposure factors) can be used. In either case the site’s remedy must include land use
restrictions approved by the Division.
CAS No.
Cgw&Csg
Tox Basis
Indoor Air/Crawlspace Screening Levels at Target Risk 1.0E-04 (IASL C) to be Used if
only One Carcinogen is Present
Indoor Air and Crawlspace Screening Concentration (IASL)1,2
ug/m3
Sub-slab and Exterior
Soil Gas Screening
Level (SGSL) 1,2
ug/m3
Ground Water
Screening Level
(GWSL) 1,2
ug/L Contaminant
GWSL=IASL (B) x 1/Henry's
Constant x 1/AF SGSL =IASL (B) x 1/AF Tox Basis Tox Basis
1. Based on November 2015 USEPA Regional Screening Level Target Air Concentrations and the USEPA VI Screening Level Calculator.
2. TCR = Target Cancer Risk; THQ=Target Hazard Quotient; C= Carcinogenic; N = Non-Carcinognic
DIVISION OF WASTE MANAGEMENT
RESIDENTIAL VAPOR INTRUSION SCREENING CONCENTRATIONS (March, 2016)
Attenuation Factor (AF) = 0.001 0.03 IASL (A)IASL (B)IASL (C)
TCR = 1.0E-06 TCR = 1.0E-05 TCR = 1.0E-04
THQ = 0.2 THQ = 0.2 THQ = 0.2 Tox Basis
CAS No.
Cgw&Csg
Tox Basis
Indoor Air/Crawlspace Screening Levels at Target Risk 1.0E-04 (IASL C) to be Used if
only One Carcinogen is Present
Indoor Air and Crawlspace Screening Concentration (IASL)1,2
ug/m3
Sub-slab and Exterior
Soil Gas Screening
Level (SGSL) 1,2
ug/m3
Ground Water
Screening Level
(GWSL) 1,2
ug/L Contaminant
GWSL=IASL (B) x 1/Henry's
Constant x 1/AF SGSL =IASL (B) x 1/AF Tox Basis Tox Basis
108-86-1 Bromobenzene 1.24E+02 4.17E+02 NC 1.25E+01 NC 1.25E+01 NC 1.25E+01 NC
74-97-5 Bromochloromethane 1.40E+02 2.78E+02 NC 8.34E+00 NC 8.34E+00 NC 8.34E+00 NC
75-27-4 Bromodichloromethane 8.76E+00 2.53E+01 C 7.59E-02 C 7.59E-01 C 7.59E+00 C
75-25-2 Bromoform 1.17E+03 8.51E+02 C 2.55E+00 C 2.55E+01 C 2.55E+02 C
74-83-9 Bromomethane 3.48E+00 3.48E+01 NC 1.04E+00 NC 1.04E+00 NC 1.04E+00 NC
106-99-0 Butadiene, 1,3-1.39E-01 1.39E+01 NC 9.36E-02 C 4.17E-01 NC 4.17E-01 NC
78-92-2 Butyl alcohol, sec-1.69E+07 2.09E+05 NC 6.26E+03 NC 6.26E+03 NC 6.26E+03 NC
75-15-0 Carbon Disulfide 2.48E+02 4.87E+03 NC 1.46E+02 NC 1.46E+02 NC 1.46E+02 NC
56-23-5 Carbon Tetrachloride 4.15E+00 1.56E+02 C 4.68E-01 C 4.68E+00 C 2.09E+01 NC
463-58-1 Carbonyl Sulfide 8.36E-01 6.95E+02 NC 2.09E+01 NC 2.09E+01 NC 2.09E+01 NC
12789-03-6 Chlordane Not sufficiently toxic or volatile 4.87E+00 NC 2.81E-02 C 1.46E-01 NC 1.46E-01 NC
7782-50-5 Chlorine 6.54E-02 1.04E+00 NC 3.13E-02 NC 3.13E-02 NC 3.13E-02 NC
10049-04-4 Chlorine Dioxide No Solubility 1.39E+00 NC 4.17E-02 NC 4.17E-02 NC 4.17E-02 NC
75-68-3 Chloro-1,1-difluoroethane, 1-4.34E+03 3.48E+05 NC 1.04E+04 NC 1.04E+04 NC 1.04E+04 NC
126-99-8 Chloro-1,3-butadiene, 2-4.08E-02 3.12E+00 C 9.36E-03 C 9.36E-02 C 9.36E-01 C
108-90-7 Chlorobenzene 8.20E+01 3.48E+02 NC 1.04E+01 NC 1.04E+01 NC 1.04E+01 NC
98-56-6 Chlorobenzotrifluoride, 4-4.41E+01 2.09E+03 NC 6.26E+01 NC 6.26E+01 NC 6.26E+01 NC
75-45-6 Chlorodifluoromethane 6.28E+03 3.48E+05 NC 1.04E+04 NC 1.04E+04 NC 1.04E+04 NC
67-66-3 Chloroform 8.14E+00 4.07E+01 C 1.22E-01 C 1.22E+00 C 1.22E+01 C
74-87-3 Chloromethane 5.21E+01 6.26E+02 NC 1.88E+01 NC 1.88E+01 NC 1.88E+01 NC
107-30-2 Chloromethyl Methyl Ether 3.27E+00 1.36E+00 C 4.07E-03 C 4.07E-02 C 4.07E-01 C
76-06-2 Chloropicrin 9.95E-01 2.78E+00 NC 8.34E-02 NC 8.34E-02 NC 8.34E-02 NC
98-82-8 Cumene 1.77E+02 2.78E+03 NC 8.34E+01 NC 8.34E+01 NC 8.34E+01 NC
57-12-5 Cyanide (CN-)1.69E-01 5.56E+00 NC 1.67E-01 NC 1.67E-01 NC 1.67E-01 NC
110-82-7 Cyclohexane 2.04E+02 4.17E+04 NC 1.25E+03 NC 1.25E+03 NC 1.25E+03 NC
108-94-1 Cyclohexanone 3.97E+05 4.87E+03 NC 1.46E+02 NC 1.46E+02 NC 1.46E+02 NC
110-83-8 Cyclohexene 1.12E+02 6.95E+03 NC 2.09E+02 NC 2.09E+02 NC 2.09E+02 NC
72-55-9 DDE, p,p'-Not sufficiently toxic or volatile 9.65E+00 C 2.89E-02 C 2.89E-01 C 2.89E+00 C
96-12-8 Dibromo-3-chloropropane, 1,2-2.81E-01 5.63E-02 C,M 1.69E-04 C,M 1.69E-03 C,M 1.69E-02 C,M
106-93-4 Dibromoethane, 1,2-1.76E+00 1.56E+00 C 4.68E-03 C 4.68E-02 C 4.68E-01 C
74-95-3 Dibromomethane (Methylene Bromide)2.48E+01 2.78E+01 NC 8.34E-01 NC 8.34E-01 NC 8.34E-01 NC
764-41-0 Dichloro-2-butene, 1,4-1.92E-02 2.23E-01 C 6.68E-04 C 6.68E-03 C 6.68E-02 C
1476-11-5 Dichloro-2-butene, cis-1,4-2.46E-01 2.23E-01 C 6.68E-04 C 6.68E-03 C 6.68E-02 C
110-57-6 Dichloro-2-butene, trans-1,4-2.46E-01 2.23E-01 C 6.68E-04 C 6.68E-03 C 6.68E-02 C
95-50-1 Dichlorobenzene, 1,2-5.31E+02 1.39E+03 NC 4.17E+01 NC 4.17E+01 NC 4.17E+01 NC
1. Based on November 2015 USEPA Regional Screening Level Target Air Concentrations and the USEPA VI Screening Level Calculator.
2. TCR = Target Cancer Risk; THQ=Target Hazard Quotient; C= Carcinogenic; N = Non-Carcinognic
DIVISION OF WASTE MANAGEMENT
RESIDENTIAL VAPOR INTRUSION SCREENING CONCENTRATIONS (March, 2016)
Attenuation Factor (AF) = 0.001 0.03 IASL (A)IASL (B)IASL (C)
TCR = 1.0E-06 TCR = 1.0E-05 TCR = 1.0E-04
THQ = 0.2 THQ = 0.2 THQ = 0.2 Tox Basis
CAS No.
Cgw&Csg
Tox Basis
Indoor Air/Crawlspace Screening Levels at Target Risk 1.0E-04 (IASL C) to be Used if
only One Carcinogen is Present
Indoor Air and Crawlspace Screening Concentration (IASL)1,2
ug/m3
Sub-slab and Exterior
Soil Gas Screening
Level (SGSL) 1,2
ug/m3
Ground Water
Screening Level
(GWSL) 1,2
ug/L Contaminant
GWSL=IASL (B) x 1/Henry's
Constant x 1/AF SGSL =IASL (B) x 1/AF Tox Basis Tox Basis
106-46-7 Dichlorobenzene, 1,4-2.59E+01 8.51E+01 C 2.55E-01 C 2.55E+00 C 2.55E+01 C
75-71-8 Dichlorodifluoromethane 1.49E+00 6.95E+02 NC 2.09E+01 NC 2.09E+01 NC 2.09E+01 NC
75-34-3 Dichloroethane, 1,1-7.64E+01 5.85E+02 C 1.75E+00 C 1.75E+01 C 1.75E+02 C
107-06-2 Dichloroethane, 1,2-2.24E+01 3.60E+01 C 1.08E-01 C 1.08E+00 C 1.46E+00 NC
75-35-4 Dichloroethylene, 1,1-3.91E+01 1.39E+03 NC 4.17E+01 NC 4.17E+01 NC 4.17E+01 NC
78-87-5 Dichloropropane, 1,2-7.24E+00 2.78E+01 NC 2.81E-01 C 8.34E-01 NC 8.34E-01 NC
542-75-6 Dichloropropene, 1,3-2.87E+01 1.39E+02 NC 7.02E-01 C 4.17E+00 NC 4.17E+00 NC
77-73-6 Dicyclopentadiene 2.45E-02 2.09E+00 NC 6.26E-02 NC 6.26E-02 NC 6.26E-02 NC
75-37-6 Difluoroethane, 1,1-1.01E+04 2.78E+05 NC 8.34E+03 NC 8.34E+03 NC 8.34E+03 NC
94-58-6 Dihydrosafrole 4.33E+03 7.20E+01 C 2.16E-01 C 2.16E+00 C 2.16E+01 C
108-20-3 Diisopropyl Ether 1.39E+03 4.87E+03 NC 1.46E+02 NC 1.46E+02 NC 1.46E+02 NC
68-12-2 Dimethylformamide 2.07E+06 2.09E+02 NC 6.26E+00 NC 6.26E+00 NC 6.26E+00 NC
57-14-7 Dimethylhydrazine, 1,1-7.91E-01 1.39E-02 NC 4.17E-04 NC 4.17E-04 NC 4.17E-04 NC
540-73-8 Dimethylhydrazine, 1,2-6.18E+01 5.85E-03 C 1.75E-05 C 1.75E-04 C 1.75E-03 C
513-37-1 Dimethylvinylchloride 4.85E-01 7.20E+01 C 2.16E-01 C 2.16E+00 C 2.16E+01 C
123-91-1 Dioxane, 1,4-2.86E+04 1.87E+02 C 5.62E-01 C 5.62E+00 C 6.26E+00 NC
106-89-8 Epichlorohydrin 1.68E+02 6.95E+00 NC 2.09E-01 NC 2.09E-01 NC 2.09E-01 NC
106-88-7 Epoxybutane, 1,2-5.67E+02 1.39E+02 NC 4.17E+00 NC 4.17E+00 NC 4.17E+00 NC
111-15-9 Ethoxyethanol Acetate, 2-9.57E+04 4.17E+02 NC 1.25E+01 NC 1.25E+01 NC 1.25E+01 NC
110-80-5 Ethoxyethanol, 2-2.17E+06 1.39E+03 NC 4.17E+01 NC 4.17E+01 NC 4.17E+01 NC
141-78-6 Ethyl Acetate 2.67E+03 4.87E+02 NC 1.46E+01 NC 1.46E+01 NC 1.46E+01 NC
140-88-5 Ethyl Acrylate 1.20E+02 5.56E+01 NC 1.67E+00 NC 1.67E+00 NC 1.67E+00 NC
75-00-3 Ethyl Chloride (Chloroethane)4.60E+03 6.95E+04 NC 2.09E+03 NC 2.09E+03 NC 2.09E+03 NC
97-63-2 Ethyl Methacrylate 2.67E+03 2.09E+03 NC 6.26E+01 NC 6.26E+01 NC 6.26E+01 NC
100-41-4 Ethylbenzene 3.49E+01 3.74E+02 C 1.12E+00 C 1.12E+01 C 1.12E+02 C
75-21-8 Ethylene Oxide 5.27E+01 1.06E+01 C 3.19E-02 C 3.19E-01 C 3.19E+00 C
151-56-4 Ethyleneimine 2.99E+00 4.93E-02 C 1.48E-04 C 1.48E-03 C 1.48E-02 C
50-00-0 Formaldehyde 1.48E+05 6.81E+01 NC 2.16E-01 C 2.04E+00 NC 2.04E+00 NC
64-18-6 Formic Acid 9.16E+03 2.09E+00 NC 6.26E-02 NC 6.26E-02 NC 6.26E-02 NC
98-01-1 Furfural 6.77E+04 3.48E+02 NC 1.04E+01 NC 1.04E+01 NC 1.04E+01 NC
765-34-4 Glycidyl 9.98E+03 6.95E+00 NC 2.09E-01 NC 2.09E-01 NC 2.09E-01 NC
76-44-8 Heptachlor 1.80E+00 7.20E-01 C 2.16E-03 C 2.16E-02 C 2.16E-01 C
1024-57-3 Heptachlor Epoxide 1.26E+01 3.60E-01 C 1.08E-03 C 1.08E-02 C 1.08E-01 C
39635-31-9 Heptachlorobiphenyl, 2,3,3',4,4',5,5'- (PCB 189)Not sufficiently toxic or volatile 8.51E-01 C 2.55E-03 C 2.55E-02 C 2.55E-01 C
1. Based on November 2015 USEPA Regional Screening Level Target Air Concentrations and the USEPA VI Screening Level Calculator.
2. TCR = Target Cancer Risk; THQ=Target Hazard Quotient; C= Carcinogenic; N = Non-Carcinognic
DIVISION OF WASTE MANAGEMENT
RESIDENTIAL VAPOR INTRUSION SCREENING CONCENTRATIONS (March, 2016)
Attenuation Factor (AF) = 0.001 0.03 IASL (A)IASL (B)IASL (C)
TCR = 1.0E-06 TCR = 1.0E-05 TCR = 1.0E-04
THQ = 0.2 THQ = 0.2 THQ = 0.2 Tox Basis
CAS No.
Cgw&Csg
Tox Basis
Indoor Air/Crawlspace Screening Levels at Target Risk 1.0E-04 (IASL C) to be Used if
only One Carcinogen is Present
Indoor Air and Crawlspace Screening Concentration (IASL)1,2
ug/m3
Sub-slab and Exterior
Soil Gas Screening
Level (SGSL) 1,2
ug/m3
Ground Water
Screening Level
(GWSL) 1,2
ug/L Contaminant
GWSL=IASL (B) x 1/Henry's
Constant x 1/AF SGSL =IASL (B) x 1/AF Tox Basis Tox Basis
118-74-1 Hexachlorobenzene 8.78E-01 2.03E+00 C 6.10E-03 C 6.10E-02 C 6.10E-01 C
38380-08-4 Hexachlorobiphenyl, 2,3,3',4,4',5- (PCB 156)4.37E+00 8.51E-01 C 2.55E-03 C 2.55E-02 C 2.55E-01 C
69782-90-7 Hexachlorobiphenyl, 2,3,3',4,4',5'- (PCB 157)Not sufficiently toxic or volatile 8.51E-01 C 2.55E-03 C 2.55E-02 C 2.55E-01 C
52663-72-6 Hexachlorobiphenyl, 2,3',4,4',5,5'- (PCB 167)Not sufficiently toxic or volatile 8.51E-01 C 2.55E-03 C 2.55E-02 C 2.55E-01 C
32774-16-6 Hexachlorobiphenyl, 3,3',4,4',5,5'- (PCB 169)9.11E-03 8.51E-04 C 2.55E-06 C 2.55E-05 C 2.55E-04 C
87-68-3 Hexachlorobutadiene 3.03E+00 4.25E+01 C 1.28E-01 C 1.28E+00 C 1.28E+01 C
77-47-4 Hexachlorocyclopentadiene 3.78E-02 1.39E+00 NC 4.17E-02 NC 4.17E-02 NC 4.17E-02 NC
67-72-1 Hexachloroethane 1.60E+01 8.51E+01 C 2.55E-01 C 2.55E+00 C 6.26E+00 NC
822-06-0 Hexamethylene Diisocyanate, 1,6-1.06E+00 6.95E-02 NC 2.09E-03 NC 2.09E-03 NC 2.09E-03 NC
110-54-3 Hexane, N-1.98E+00 4.87E+03 NC 1.46E+02 NC 1.46E+02 NC 1.46E+02 NC
591-78-6 Hexanone, 2-1.64E+03 2.09E+02 NC 6.26E+00 NC 6.26E+00 NC 6.26E+00 NC
302-01-2 Hydrazine 2.29E+02 1.91E-01 C 5.73E-04 C 5.73E-03 C 6.26E-03 NC
7647-01-0 Hydrogen Chloride 5.00E-08 1.39E+02 NC 4.17E+00 NC 4.17E+00 NC 4.17E+00 NC
74-90-8 Hydrogen Cyanide 3.07E+01 5.56E+00 NC 1.67E-01 NC 1.67E-01 NC 1.67E-01 NC
7664-39-3 Hydrogen Fluoride 6.87E+02 9.73E+01 NC 2.92E+00 NC 2.92E+00 NC 2.92E+00 NC
7783-06-4 Hydrogen Sulfide 1.19E+00 1.39E+01 NC 4.17E-01 NC 4.17E-01 NC 4.17E-01 NC
67-63-0 Isopropanol 1.26E+05 1.39E+03 NC 4.17E+01 NC 4.17E+01 NC 4.17E+01 NC
7439-97-6 Mercury (elemental)1.78E-01 2.09E+00 NC 6.26E-02 NC 6.26E-02 NC 6.26E-02 NC
126-98-7 Methacrylonitrile 6.20E+02 2.09E+02 NC 6.26E+00 NC 6.26E+00 NC 6.26E+00 NC
67-56-1 Methanol 2.24E+07 1.39E+05 NC 4.17E+03 NC 4.17E+03 NC 4.17E+03 NC
110-49-6 Methoxyethanol Acetate, 2-1.64E+04 6.95E+00 NC 2.09E-01 NC 2.09E-01 NC 2.09E-01 NC
109-86-4 Methoxyethanol, 2-3.09E+05 1.39E+02 NC 4.17E+00 NC 4.17E+00 NC 4.17E+00 NC
96-33-3 Methyl Acrylate 5.13E+02 1.39E+02 NC 4.17E+00 NC 4.17E+00 NC 4.17E+00 NC
78-93-3 Methyl Ethyl Ketone (2-Butanone)4.48E+05 3.48E+04 NC 1.04E+03 NC 1.04E+03 NC 1.04E+03 NC
60-34-4 Methyl Hydrazine 3.37E+01 1.39E-01 NC 2.81E-03 C 4.17E-03 NC 4.17E-03 NC
108-10-1 Methyl Isobutyl Ketone (4-methyl-2-pentanone)1.11E+05 2.09E+04 NC 6.26E+02 NC 6.26E+02 NC 6.26E+02 NC
624-83-9 Methyl Isocyanate 5.51E+00 6.95E+00 NC 2.09E-01 NC 2.09E-01 NC 2.09E-01 NC
80-62-6 Methyl Methacrylate 1.12E+04 4.87E+03 NC 1.46E+02 NC 1.46E+02 NC 1.46E+02 NC
25013-15-4 Methyl Styrene (Mixed Isomers)7.79E+01 2.78E+02 NC 8.34E+00 NC 8.34E+00 NC 8.34E+00 NC
1634-04-4 Methyl tert-Butyl Ether (MTBE)4.50E+03 3.60E+03 C 1.08E+01 C 1.08E+02 C 6.26E+02 NC
75-09-2 Methylene Chloride 9.42E+02 4.17E+03 NC 1.01E+02 C 1.25E+02 NC 1.25E+02 NC
2385-85-5 Mirex 1.66E-01 1.84E-01 C,M 5.51E-04 C,M 5.51E-03 C,M 5.51E-02 C,M
91-20-3 Naphthalene 3.48E+01 2.09E+01 NC 8.26E-02 C 6.26E-01 NC 6.26E-01 NC
13463-39-3 Nickel Carbonyl 1.43E-04 9.73E-02 NC 2.92E-03 NC 2.92E-03 NC 2.92E-03 NC
98-95-3 Nitrobenzene 7.15E+02 2.34E+01 C 7.02E-02 C 7.02E-01 C 1.88E+00 NC
1. Based on November 2015 USEPA Regional Screening Level Target Air Concentrations and the USEPA VI Screening Level Calculator.
2. TCR = Target Cancer Risk; THQ=Target Hazard Quotient; C= Carcinogenic; N = Non-Carcinognic
DIVISION OF WASTE MANAGEMENT
RESIDENTIAL VAPOR INTRUSION SCREENING CONCENTRATIONS (March, 2016)
Attenuation Factor (AF) = 0.001 0.03 IASL (A)IASL (B)IASL (C)
TCR = 1.0E-06 TCR = 1.0E-05 TCR = 1.0E-04
THQ = 0.2 THQ = 0.2 THQ = 0.2 Tox Basis
CAS No.
Cgw&Csg
Tox Basis
Indoor Air/Crawlspace Screening Levels at Target Risk 1.0E-04 (IASL C) to be Used if
only One Carcinogen is Present
Indoor Air and Crawlspace Screening Concentration (IASL)1,2
ug/m3
Sub-slab and Exterior
Soil Gas Screening
Level (SGSL) 1,2
ug/m3
Ground Water
Screening Level
(GWSL) 1,2
ug/L Contaminant
GWSL=IASL (B) x 1/Henry's
Constant x 1/AF SGSL =IASL (B) x 1/AF Tox Basis Tox Basis
75-52-5 Nitromethane 8.92E+02 3.48E+01 NC 3.19E-01 C 1.04E+00 NC 1.04E+00 NC
79-46-9 Nitropropane, 2-2.14E+00 3.47E-01 C 1.04E-03 C 1.04E-02 C 1.04E-01 C
62-75-9 Nitrosodimethylamine, N-9.73E+00 2.41E-02 C 7.24E-05 C 7.24E-04 C 7.24E-03 C
924-16-3 Nitroso-di-N-butylamine, N-3.25E+01 5.85E-01 C 1.75E-03 C 1.75E-02 C 1.75E-01 C
10595-95-6 Nitrosomethylethylamine, N-7.57E+01 1.49E-01 C 4.46E-04 C 4.46E-03 C 4.46E-02 C
111-84-2 Nonane, n-3.00E-02 1.39E+02 NC 4.17E+00 NC 4.17E+00 NC 4.17E+00 NC
32598-14-4 Pentachlorobiphenyl, 2,3,3',4,4'- (PCB 105)2.21E+00 8.51E-01 C 2.55E-03 C 2.55E-02 C 2.55E-01 C
74472-37-0 Pentachlorobiphenyl, 2,3,4,4',5- (PCB 114)6.76E+00 8.51E-01 C 2.55E-03 C 2.55E-02 C 2.55E-01 C
31508-00-6 Pentachlorobiphenyl, 2,3',4,4',5- (PCB 118)2.17E+00 8.51E-01 C 2.55E-03 C 2.55E-02 C 2.55E-01 C
65510-44-3 Pentachlorobiphenyl, 2',3,4,4',5- (PCB 123)3.29E+00 8.51E-01 C 2.55E-03 C 2.55E-02 C 2.55E-01 C
57465-28-8 Pentachlorobiphenyl, 3,3',4,4',5- (PCB 126)9.51E-04 2.46E-04 C 7.39E-07 C 7.39E-06 C 7.39E-05 C
109-66-0 Pentane, n-4.08E+00 6.95E+03 NC 2.09E+02 NC 2.09E+02 NC 2.09E+02 NC
75-44-5 Phosgene 9.16E-02 2.09E+00 NC 6.26E-02 NC 6.26E-02 NC 6.26E-02 NC
7803-51-2 Phosphine 6.27E-02 2.09E+00 NC 6.26E-02 NC 6.26E-02 NC 6.26E-02 NC
123-38-6 Propionaldehyde 5.56E+02 5.56E+01 NC 1.67E+00 NC 1.67E+00 NC 1.67E+00 NC
103-65-1 Propyl benzene 4.86E+02 6.95E+03 NC 2.09E+02 NC 2.09E+02 NC 2.09E+02 NC
115-07-1 Propylene 7.81E+01 2.09E+04 NC 6.26E+02 NC 6.26E+02 NC 6.26E+02 NC
107-98-2 Propylene Glycol Monomethyl Ether 1.11E+07 1.39E+04 NC 4.17E+02 NC 4.17E+02 NC 4.17E+02 NC
75-56-9 Propylene Oxide 2.20E+03 2.09E+02 NC 7.59E-01 C 6.26E+00 NC 6.26E+00 NC
100-42-5 Styrene 1.86E+03 6.95E+03 NC 2.09E+02 NC 2.09E+02 NC 2.09E+02 NC
7446-11-9 Sulfur Trioxide No Solubility 6.95E+00 NC 2.09E-01 NC 2.09E-01 NC 2.09E-01 NC
1746-01-6 TCDD, 2,3,7,8-3.61E-04 2.46E-05 C 7.39E-08 C 7.39E-07 C 7.39E-06 C
70362-50-4 Tetrachlorobiphenyl, 3,4,4',5- (PCB 81)2.80E-01 8.51E-02 C 2.55E-04 C 2.55E-03 C 2.55E-02 C
630-20-6 Tetrachloroethane, 1,1,1,2-3.71E+01 1.26E+02 C 3.79E-01 C 3.79E+00 C 3.79E+01 C
79-34-5 Tetrachloroethane, 1,1,2,2-3.23E+01 1.61E+01 C 4.84E-02 C 4.84E-01 C 4.84E+00 C
127-18-4 Tetrachloroethylene 1.15E+01 2.78E+02 NC 8.34E+00 NC 8.34E+00 NC 8.34E+00 NC
811-97-2 Tetrafluoroethane, 1,1,1,2-8.16E+03 5.56E+05 NC 1.67E+04 NC 1.67E+04 NC 1.67E+04 NC
109-99-9 Tetrahydrofuran 1.45E+05 1.39E+04 NC 4.17E+02 NC 4.17E+02 NC 4.17E+02 NC
7550-45-0 Titanium Tetrachloride No Solubility 6.95E-01 NC 2.09E-02 NC 2.09E-02 NC 2.09E-02 NC
108-88-3 Toluene 3.84E+03 3.48E+04 NC 1.04E+03 NC 1.04E+03 NC 1.04E+03 NC
76-13-1 Trichloro-1,2,2-trifluoroethane, 1,1,2-2.91E+02 2.09E+05 NC 6.26E+03 NC 6.26E+03 NC 6.26E+03 NC
120-82-1 Trichlorobenzene, 1,2,4-7.19E+00 1.39E+01 NC 4.17E-01 NC 4.17E-01 NC 4.17E-01 NC
71-55-6 Trichloroethane, 1,1,1-1.48E+03 3.48E+04 NC 1.04E+03 NC 1.04E+03 NC 1.04E+03 NC
79-00-5 Trichloroethane, 1,1,2-1.24E+00 1.39E+00 NC 4.17E-02 NC 4.17E-02 NC 4.17E-02 NC
79-01-6 Trichloroethylene 1.04E+00 1.39E+01 NC 4.17E-01 NC 4.17E-01 NC 4.17E-01 NC
1. Based on November 2015 USEPA Regional Screening Level Target Air Concentrations and the USEPA VI Screening Level Calculator.
2. TCR = Target Cancer Risk; THQ=Target Hazard Quotient; C= Carcinogenic; N = Non-Carcinognic
DIVISION OF WASTE MANAGEMENT
RESIDENTIAL VAPOR INTRUSION SCREENING CONCENTRATIONS (March, 2016)
Attenuation Factor (AF) = 0.001 0.03 IASL (A)IASL (B)IASL (C)
TCR = 1.0E-06 TCR = 1.0E-05 TCR = 1.0E-04
THQ = 0.2 THQ = 0.2 THQ = 0.2 Tox Basis
CAS No.
Cgw&Csg
Tox Basis
Indoor Air/Crawlspace Screening Levels at Target Risk 1.0E-04 (IASL C) to be Used if
only One Carcinogen is Present
Indoor Air and Crawlspace Screening Concentration (IASL)1,2
ug/m3
Sub-slab and Exterior
Soil Gas Screening
Level (SGSL) 1,2
ug/m3
Ground Water
Screening Level
(GWSL) 1,2
ug/L Contaminant
GWSL=IASL (B) x 1/Henry's
Constant x 1/AF SGSL =IASL (B) x 1/AF Tox Basis Tox Basis
96-18-4 Trichloropropane, 1,2,3-4.46E+00 2.09E+00 NC 6.26E-02 NC 6.26E-02 NC 6.26E-02 NC
96-19-5 Trichloropropene, 1,2,3-8.70E-02 2.09E+00 NC 6.26E-02 NC 6.26E-02 NC 6.26E-02 NC
121-44-8 Triethylamine 2.40E+02 4.87E+01 NC 1.46E+00 NC 1.46E+00 NC 1.46E+00 NC
420-46-2 Trifluoroethane, 1,1,1-1.33E+02 1.39E+05 NC 4.17E+03 NC 4.17E+03 NC 4.17E+03 NC
526-73-8 Trimethylbenzene, 1,2,3-5.85E+00 3.48E+01 NC 1.04E+00 NC 1.04E+00 NC 1.04E+00 NC
95-63-6 Trimethylbenzene, 1,2,4-5.80E+00 4.87E+01 NC 1.46E+00 NC 1.46E+00 NC 1.46E+00 NC
126-72-7 Tris(2,3-dibromopropyl)phosphate 4.77E+01 1.42E+00 C 4.25E-03 C 4.25E-02 C 4.25E-01 C
108-05-4 Vinyl Acetate 2.00E+03 1.39E+03 NC 4.17E+01 NC 4.17E+01 NC 4.17E+01 NC
593-60-2 Vinyl Bromide 1.24E+00 2.09E+01 NC 8.77E-02 C 6.26E-01 NC 6.26E-01 NC
75-01-4 Vinyl Chloride 2.03E+00 7.68E+01 C 2.30E-01 C 2.30E+00 C 2.09E+01 NC
108-38-3 Xylene, m-7.11E+01 6.95E+02 NC 2.09E+01 NC 2.09E+01 NC 2.09E+01 NC
95-47-6 Xylene, o-9.85E+01 6.95E+02 NC 2.09E+01 NC 2.09E+01 NC 2.09E+01 NC
106-42-3 Xylene, P-7.39E+01 6.95E+02 NC 2.09E+01 NC 2.09E+01 NC 2.09E+01 NC
1330-20-7 Xylenes 7.69E+01 6.95E+02 NC 2.09E+01 NC 2.09E+01 NC 2.09E+01 NC
1. Based on November 2015 USEPA Regional Screening Level Target Air Concentrations and the USEPA VI Screening Level Calculator.
2. TCR = Target Cancer Risk; THQ=Target Hazard Quotient; C= Carcinogenic; N = Non-Carcinognic