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Risk Assessment
Soil-Screening Numbers - Updated Table
[09/23/10]
Three updated tables of OEHHA Soil Screening Numbers.
Table 1 - Soil-Screening Numbers (mg/kg soil) for Nonvolatile Chemicals Based on Total Exposure to Contaminated Soil: Inhalation, Ingestion and Dermal Absorption.
Table 2 - Soil-Gas-Screening Numbers for Volatile Chemicals below Buildings Constructed With Engineered Fill below Sub-slab Gravel.
Table 3 - Soil-Gas-Screening Numbers for Volatile Chemicals below Buildings Constructed Without Engineered Fill below Sub-slab Gravel
Table 1.
Soil-Screening Numbers (mg/kg soil) for Nonvolatile Chemicals Based on Total Exposure to Contaminated Soil: Inhalation, Ingestion and Dermal Absorption
Soil-Screening Number |
||||
Residential Scenario |
Commercial/Industrial Scenario |
|||
Organic Acidic Chemicals |
|
Basis1 |
|
Basis1 |
2, 4-D |
6.9E+02 |
(nc) |
7.7E+03 |
(nc) |
2,4,5-T |
5.5E+02 |
(nc) |
6.1E+03 |
(nc) |
Pentachlorophenol |
4.4E+00 |
(ca) |
1.3E+01 |
(ca) |
Organic Neutral Chemicals |
|
|
|
|
Aldrin |
3.3E-02 |
(ca) |
1.3E-01 |
(ca) |
Benzo(a)pyrene |
3.8E-02 |
(ca) |
1.3E-01 |
(ca) |
Chlordane |
4.3E-01 |
(ca) |
1.7E+00 |
(ca) |
DDD |
2.3E+00 |
(ca) |
9.0E+00 |
(ca) |
DDE |
1.6E+00 |
(ca) |
6.3E+00 |
(ca) |
DDT |
1.6E+00 |
(ca) |
6.3E+00 |
(ca) |
Dieldrin |
3.5E-02 |
(ca) |
1.3E-01 |
(ca) |
1,4-Dioxane |
1.8E+01 |
(ca) |
6.4E+01 |
(ca) |
Dioxin (2,3,7, 8-TCDD) |
4.6E-06 |
(ca) |
1.9E-05 |
(ca) |
Endrin |
2.1E+01 |
(nc) |
2.3E+02 |
(nc) |
Heptachlor |
1.3E-01 |
(ca) |
5.2E-01 |
(ca) |
Lindane |
5.0E-01 |
(ca) |
2.0E+00 |
(ca) |
Kepone |
3.5E-02 |
(ca) |
1.3E-01 |
(ca) |
Methoxychlor |
3.4E+02 |
(nc) |
3.8E+03 |
(nc) |
Mirex |
3.1E-02 |
(ca) |
1.2E-01 |
(ca) |
PCBs |
8.9E-02 |
(ca) |
3.0E-01 |
(ca) |
Toxaphene |
4.6E-01 |
(ca) |
1.8E+00 |
(ca) |
Inorganic Chemicals |
|
|
|
|
Antimony and compounds |
3.0E+01 |
(nc) |
3.8E+02 |
(nc) |
Arsenic2 |
7.0E-02 |
(ca) |
2.4E-01 |
(ca) |
Barium and compounds |
5.2E+03 |
(nc) |
6.3E+04 |
(nc) |
Beryllium and compounds |
1.6E+014 |
(nc) |
1.9E+024 |
(nc) |
Beryllium oxide |
1.6E+014 |
(nc) |
1.9E+024 |
(nc) |
Beryllium sulfate3 |
2.9E+004 |
(ca) |
6.3E+004 |
(ca) |
Cadmium and compounds |
1.7E+00 |
(ca) |
7.5E+00 |
(ca) |
Chromium III |
1.0E+05 |
(nc,max) |
1.0E+05 |
(nc,max) |
Chromium VI |
1.7E+01 |
(ca) |
3.7E+01 |
(ca) |
Cobalt |
6.6E+02 |
(nc) |
3.2E+03 |
(nc) |
Copper and compounds |
3.0E+03 |
(nc) |
3.8E+04 |
(nc) |
Fluoride |
4.6E+03 |
(nc) |
5.7E+04 |
(nc) |
Lead and lead compounds |
8.0E+014 |
(nc) |
3.2E+024 |
(nc) |
Lead acetate3 |
2.3E+00 |
(ca) |
1.0E+01 |
(ca) |
Mercury and compounds |
1.8E+01 |
(nc) |
1.8E+02 |
(nc) |
Molybdenum |
3.8E+02 |
(nc) |
4.8E+03 |
(nc) |
Nickel and compounds |
1.6E+03 |
(nc) |
1.6E+04 |
(nc) |
Nickel subsulfide3 |
3.8E-01 |
(ca) |
1.1E+04 |
(ca) |
Perchlorate |
2.8E+015,6 |
(nc) |
3.5E+025,6 |
(nc) |
Selenium |
3.8E+02 |
(nc) |
4.8E+03 |
(nc) |
Silver and compounds |
3.8E+02 |
(nc) |
4.8E+03 |
(nc) |
Thallium and compounds |
5.0E+00 |
(nc) |
6.3E+01 |
(nc) |
Vanadium and compounds |
5.3E+02 |
(nc) |
6.7E+03 |
(nc) |
Zinc |
2.3E+04 |
(nc) |
1.0E+05 |
(nc) |
1 (ca) denotes that the screening number is based on a carcinogenic potency factor, (nc) denotes that the screening number is based on a reference level in Table 3 for chronic toxic effects other than cancer, (max) denotes the screening number is based on the maximum concentration allowed, 100,000 mg/kg, and not toxicity.
2 The screening numbers for arsenic are for contamination resulting from human activity. Concentrations of naturally occurring arsenic may be far above the screening number. When levels of arsenic at a site are a concern, the agency with authority over remediation decisions should be consulted.
3 These metal salts are significantly (greater than 10-fold) more toxic than the values for the metals in general. If it is known that this chemical was used at the site, the screening number for this chemical should be used instead of the screening number for the metal and its compounds.
4 Revised in 2009
5 Added in 2010
6 While these CHHSLs are considered safe for exposure to perchlorate in soil, the potential for significant groundwater contamination from soil contaminated with perchlorate at the CHHSLs levels may exist, since the PHG level for drinking water is 6 ppb or 6 µg/L.
Table 2.
Soil-Gas-Screening Numbers for Volatile Chemicals below Buildings Constructed with Engineered Fill below Sub-slab Gravel
Soil-Gas-Screening Number |
||||
Residential Scenario |
Commercial/Industrial Scenario |
|||
|
|
Basis1 |
|
Basis1 |
Benzene |
8.5 E-02 |
(ca)2 |
2.8 E-01 |
(ca) |
Carbon Tetrachloride |
6.3 E-02 |
(ca) |
2.1 E-01 |
(ca) |
1,2-Dichloroethane |
1.1 E-01 |
(ca) |
3.6 E-01 |
(ca) |
cis-1,2-Dichloroethylene |
4.1 E+01 |
(nc)2 |
1.2 E+02 |
(nc) |
trans-1,2-Dichloroethylene |
8.4 E+01 |
(nc) |
2.4 E+02 |
(nc) |
Ethylbenzene |
1.1 E+004 |
(ca) |
3.6 E+004 |
(ca) |
Mercury (elemental) |
2.0 E-01 |
(nc) |
5.6 E-01 |
(nc) |
Methyl tert-Butyl Ether |
8.6 E+00 |
(ca) |
2.9 E+01 |
(ca) |
Naphthalene |
9.3 E-02 |
(ca) |
3.1 E-01 |
(ca) |
Tetrachloroethylene |
4.7 E-01 |
(ca) |
1.6 E+00 |
(ca) |
Tetraethyl Lead |
1.6 E-03 |
(nc) |
4.5 E-03 |
(nc) |
Toluene |
3.2 E+02 |
(nc) |
8.9 E+02 |
(nc) |
1,1,1-Trichloroethane |
2.5 E+03 |
(nc) |
7.0 E+03 |
(nc) |
Trichloroethylene |
1.3 E+00 |
(ca) |
4.4 E+00 |
(ca) |
Vinyl Chloride |
2.8 E-02 |
(ca) |
9.5 E-02 |
(ca) |
m-Xylene |
8.5 E+02 |
(nc) |
2.4 E+03 |
(nc) |
o-Xylene |
7.4 E+023 |
(nc) |
2.1 E+033 |
(nc) |
p-Xylene |
8.0 E+02 |
(nc) |
2.2 E+03 |
(nc) |
1 (ca) denotes that the screening number is based on a carcinogenic potency factor, (nc) denotes that the screening number is based on a reference level in Table 3 for chronic toxic effects other than cancer, (max) denotes the screening number is based on the maximum concentration allowed, 100,000 mg/kg, and not toxicity.
2 (ca) denotes that the screening number is based on a carcinogenic potency factor, (nc) denotes that the screening number is based on a reference level in Table 3 for chronic toxic effects other than cancer.
3 Recommended soil-gas-screening number for xylenes. The representative value for xylenes is based on the calculated lowest health-protective one amongst the three isomers.
4 Added in 2010
Table 3.
Soil-Gas-Screening Numbers for Volatile Chemicals below Buildings Constructed without Engineered Fill below Sub-slab Gravel
Soil-Gas-Screening Number |
||||
Residential Scenario |
Commercial/Industrial Scenario |
|||
|
|
Basis1 |
|
Basis1 |
Benzene |
3.6 E-02 |
(ca)2 |
1.2 E-01 |
(ca) |
Carbon Tetrachloride |
2.5 E-02 |
(ca) |
8.5 E-02 |
(ca) |
1,2-Dichloroethane |
5.0 E-02 |
(ca) |
1.7 E-01 |
(ca) |
cis-1,2-Dichloroethylene |
1.6 E+01 |
(nc)2 |
4.4 E+01 |
(nc) |
trans-1,2-Dichloroethylene |
3.2 E+01 |
(nc) |
8.9 E+01 |
(nc) |
Ethylbenzene |
4.2 E-014 |
(ca) |
1.4 E+004 |
(ca) |
Mercury (elemental) |
4.5 E-02 |
(nc) |
1.3 E-01 |
(nc) |
Methyl tert-Butyl Ether |
4.0 E+00 |
(ca) |
1.3 E+01 |
(ca) |
Naphthalene |
3.2 E-02 |
(ca) |
1.1 E-01 |
(ca) |
Tetrachloroethylene |
1.8 E-01 |
(ca) |
6.0 E-01 |
(ca) |
Tetraethyl Lead |
2.1 E-04 |
(nc) |
5.8 E-04 |
(nc) |
Toluene |
1.4 E+02 |
(nc) |
3.8 E+02 |
(nc) |
1,1,1-Trichloroethane |
9.9 E+02 |
(nc) |
2.8 E+03 |
(nc) |
Trichloroethylene |
5.3 E-01 |
(ca) |
1.8 E+00 |
(ca) |
Vinyl Chloride |
1.3 E-02 |
(ca) |
4.5 E-02 |
(ca) |
m-Xylene |
3.2 E+02 |
(nc) |
8.9 E+02 |
(nc) |
o-Xylene |
3.2 E+023 |
(nc) |
8.8 E+023 |
(nc) |
p-Xylene |
3.2 E+02 |
(nc) |
8.9 E+02 |
(nc) |
1 (ca) denotes that the screening number is based on a carcinogenic potency factor, (nc) denotes that the screening number is based on a reference level in Table 3 for chronic toxic effects other than cancer, (max) denotes the screening number is based on the maximum concentration allowed, 100,000 mg/kg, and not toxicity.
2 (ca) denotes that the screening number is based on a carcinogenic potency factor, (nc) denotes that the screening number is based on a reference level in Table 3 for chronic toxic effects other than cancer.
3 Recommended soil-gas-screening number for xylenes. The representative value for xylenes is based on the calculated lowest health-protective one amongst the three isomers.
4 Added 2010
