Ecological Indicator Soil Concentrations (mg/kg) for Protection of Terrestrial
Plants and Animalsa.
For chemicals where a value is not provided, see footnote
b.
|
Note: These values represent soil concentrations that are expected to be protective at any MTCA site and are provided for use in eliminating hazardous substances from further consideration under WAC 173-340-7493 (2)(a)(i). Where these values are exceeded, various options are provided for demonstrating that the hazardous substance does not pose a threat to ecological receptors at a site, or for developing site-specific remedial standards for eliminating threats to ecological receptors. See WAC 173-340-7493 (1)(b)(i), 173-340-7493 (2)(a)(ii) and 173-340-7493(3). |
| Hazardous Substanceb | Plantsc | Soil biotad | Wildlifee |
|
METALSf |
|||
| Aluminum (soluble salts) | 50 | ||
| Antimony | 5 | ||
| Arsenic III | 7 | ||
| Arsenic V | 10 | 60 | 132 |
| Barium | 500 | 102 | |
| Beryllium | 10 | ||
| Boron | 0.5 | ||
| Bromine | 10 | ||
| Cadmium | 4 | 20 | 14 |
| Chromium (total) | 42g | 42g | 67 |
| Cobalt | 20 | ||
| Copper | 100 | 50 | 217 |
| Fluorine | 200 | ||
| Iodine | 4 | ||
| Lead | 50 | 500 | 118 |
| Lithium | 35g | ||
| Manganese | 1,100g | 1,500 | |
| Mercury, Inorganic | 0.3 | 0.1 | 5.5 |
| Mercury, Organic | 0.4 | ||
| Molybdenum | 2 | 7 | |
| Nickel | 30 | 200 | 980 |
| Selenium | 1 | 70 | 0.3 |
| Silver | 2 | ||
| Technetium | 0.2 | ||
| Thallium | 1 | ||
| Tin | 50 | ||
| Uranium | 5 | ||
| Vanadium | 2 | ||
| Zinc | 86g | 200 | 360 |
|
PESTICIDES |
|||
| Aldrin | 0.1 | ||
| Benzene hexachloride (including lindane) | 6 | ||
| Chlordane | 1 | 2.7 | |
| DDT/DDD/DDE (total) | 0.75 | ||
| Dieldrin | 0.07 | ||
| Endrin | 0.2 | ||
| Hexachlorobenzene | 17 | ||
| Heptachlor/heptachlor epoxide (total) | 0.4 | ||
| Pentachlorophenol | 3 | 6 | 4.5 |
|
OTHER CHLORINATED ORGANICS |
|||
| 1,2,3,4-Tetrachlorobenzene | 10 | ||
| 1, 2,3-Trichlorobenzene | 20 | ||
| 1,2,4-Trichlorobenzene | 20 | ||
| 1,2-Dichloropropane | 700 | ||
| 1,4-Dichlorobenzene | 20 | ||
| 2,3,4,5-Tetrachlorophenol | 20 | ||
| 2,3,5,6-Tetrachloroaniline | 20 | 20 | |
| 2,4,5-Trichloroaniline | 20 | 20 | |
| 2,4,5-Trichlorophenol | 4 | 9 | |
| 2,4,6-Trichlorophenol | 10 | ||
| 2,4-Dichloroaniline | 100 | ||
| 3,4-Dichloroaniline | 20 | ||
| 3,4-Dichlorophenol | 20 | 20 | |
| 3-Chloroaniline | 20 | 30 | |
| 3-Chlorophenol | 7 | 10 | |
| Chlorinated dibenzofurans (total) | 2E-06 | ||
| Chloroacetamide | 2 | ||
| Chlorobenzene | 40 | ||
| Dioxins | 2E-06 | ||
| Hexachlorocyclopentadiene | 10 | ||
| PCB mixtures (total) | 40 | 0.65 | |
| Pentachloroaniline | 100 | ||
| Pentachlorobenzene | 20 | ||
|
OTHER NONCHLORINATED ORGANICS |
|||
| 2,4-Dinitrophenol | 20 | ||
| 4-Nitrophenol | 7 | ||
| Acenaphthene | 20 | ||
| Benzo(a)pyrene | 12 | ||
| Biphenyl | 60 | ||
| Diethylphthalate | 100 | ||
| Dimethylphthalate | 200 | ||
| Di-n-butyl phthalate | 200 | ||
| Fluorene | 30 | ||
| Furan | 600 | ||
| Nitrobenzene | 40 | ||
| N-nitrosodiphenylamine | 20 | ||
| Phenol | 70 | 30 | |
| Styrene | 300 | ||
| Toluene | 200 | ||
|
PETROLEUM |
|||
| Gasoline Range Organics | 100 | 5,000 mg/kg
except that the concentration shall not exceed residual saturation at the soil surface. |
|
| Diesel Range Organics | 200 | 6,000
except that the concentration shall not exceed residual saturation at the soil surface. |
Table 749-3 Notes
a Caution on misusing ecological indicator concentrations. Exceedances of the values in this table do not necessarily trigger requirements for cleanup action under this chapter. Natural background concentrations may be substituted for ecological indicator concentrations provided in this table. The table is not intended for purposes such as evaluating sludges or wastes.
This list does not imply that sampling must be conducted for each of these chemicals at every site. Sampling should be conducted for those chemicals that might be present based on available information, such as current and past uses of chemicals at the site.
b For hazardous substances where a value is not provided, plant and soil biota indicator concentrations shall be based on a literature survey conducted in accordance with WAC 173-340-7493(4) and calculated using methods described in the publications listed below in footnotes c and d. Methods to be used for developing wildlife indicator concentrations are described in Tables 749-4 and 749-5.
c Based on benchmarks published in Toxicological Benchmarks for Screening Potential Contaminants of Concern for Effects on Terrestrial Plants: 1997 revision, Oak Ridge National Laboratory, 1997.
d Based on benchmarks published in Toxicological Benchmarks for Potential Contaminants of Concern for Effects on Soil and Litter Invertebrates and Heterotrophic Process, Oak Ridge National Laboratory, 1997.
e Calculated using the exposure model provided in Table 749-4 and chemical-specific values provided in Table 749-5. Where both avian and mammalian values are available, the wildlife value is the lower of the two.
f For arsenic, use the valence state most likely to be appropriate for site conditions, unless laboratory information is available. Where soil conditions alternate between saturated, anaerobic and unsaturated, aerobic states, resulting in the alternating presence of arsenic III and arsenic V, the arsenic III concentrations shall apply.
g Benchmark replaced by Washington state natural background concentration.
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