Wildlife Exposure Model for Site-Specific Evaluationsa
| Plant | |
| KPlant | Plant uptake coefficient (dry weight basis) |
| Units: mg/kg plant/mg/kg soil | |
| Value: chemical specific (See Table 749-5) | |
| Soil Biota - Surrogate receptor: Earthworm | |
| BAFWorm | Earthworm bioaccumulation factor (dry weight basis) |
| Units: mg/kg worm/mg/kg soil | |
| Value: chemical-specific (See Table 749-5) | |
| Mammalian Predator - Surrogate receptor: Shrew (Sorex) | |
| PSB(Shrew) | Proportion of contaminated food (earthworms) in shrew diet |
| Units: unitless | |
| Value: 0.50 | |
| FIRShrew,DW | Food ingestion rate (dry weight basis) |
| Units: kg dry food/kg body weight-day | |
| Value: 0.45 | |
| SIRShrew,DW | Soil ingestion rate (dry weight basis) |
| Units: kg dry soil/kg body weight-day | |
| Value: 0.0045 | |
| RGAFSoil,shrew | Gut adsorption factor for a hazardous substance in soil expressed relative to the gut adsorption factor for the hazardous substance in food. |
| Units: unitless | |
| Value: chemical specific (See Table 749-5) | |
| TShrew | Toxicity reference value for shrew |
| Units: mg/kg-day | |
| Value: chemical specific (See Table 749-5) | |
| Home Range | 0.1 Acres |
| Avian Predator - Surrogate receptor: American Robin (Turdus migratorius) | |
| PSB(Robin) | Proportion of contaminated food (soil biota) in Robin diet |
| Units: unitless | |
| Value: 0.52 | |
| FIRRobin,DW | Food ingestion rate (dry weight basis) |
| Units: kg dry food/kg body weight-day | |
| Value: 0.207 | |
| SIRRobin,DW | Soil ingestion rate (dry weight basis) |
| Units: kg dry soil/kg body weight-day | |
| Value: 0.0215 | |
| RGAFSoil,Robin | Gut adsorption factor for a hazardous substance in soil expressed relative to the gut adsorption factor for the hazardous substance in food. |
| Units: unitless | |
| Value: chemical specific (See Table 749-5) | |
| TRobin | Toxicity reference value for Robin |
| Units: mg/kg-day | |
| Value: chemical specific (See Table 749-5) | |
| Home Range | 0.6 Acres |
| Mammalian herbivore - Surrogate receptor: Vole (Microtus) | |
| PPlant,Vole | Proportion of contaminated food (plants) in vole diet |
| Units: unitless | |
| Value: 1.0 | |
| FIRVole,DW | Food ingestion rate (dry weight basis) |
| Units: kg dry food/kg body weight-day | |
| Value: 0.315 | |
| SIRVole,DW | Soil ingestion rate (dry weight basis) |
| Units: kg dry soil/kg body weight-day | |
| Value: 0.0079 | |
| RGAFSoil,Vole | Gut adsorption factor for a hazardous substance in soil expressed relative to the gut adsorption factor for the hazardous substance in food. |
| Units: unitless | |
| Value: chemical specific (See Table 749-5) | |
| Home Range | 0.08 Acres |
| Soil concentrations for wildlife protectionb | |
| (1) Mammalian predator:
SCMP=(TShrew)/[(FIRShrew,DW x PSB(Shrew) x BAFWorm) + (SIRShrew,DW x RGAFSoil,Shrew)] |
|
| (2) Avian predator:
SCAP=(TRobin)/[(FIRRobin,DW x PSB(Robin) x BAFWorm) + (SIRRobin,DW x RGAFSoil,Robin)] |
|
| (3) Mammalian herbivore:
SCMH=(TVole)/[(FIRVole,DW x PPlant,Vole x KPlant) + (SIRVole,DW x RGAFSoil,Vole)] |
|
Table 749-4 Notes
a Substitutions for default receptors may be made as provided for in WAC 173-340-7493(7). If substitute species is used, the values for food and soil ingestion rates, and proportion of contaminated food in the diet, may be modified to reasonable maximum exposure estimates for the substitute species based on a literature search conducted in accordance with WAC 173-340-7493(4). Additional species may be added on a site-specific basis as provided in WAC 173-340-7493(2)(a). The department shall consider proposals for modifications to default values provided in this table based on new scientific information is accordance with WAC 173-340-702(14).
b Use the lowest of the three concentrations calculated as the wildlife value.
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