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Surrogate
Receptor Group
Mammalian
herbivore (vole)
Mammalian ground
insectivore (shrew)
Mammalian
carnivore (weasel)
TRV for
Lead
(mg dw/kg
bw/d) 1
Table 6.2 Calculation of the Mammalian Eco-SSLs for Lead
Food Ingestion
Rate (FIR) 2
(kg dw/kg bw/d)
Soil Ingestion as
Proportion of
Diet (P s) 2
4.70 0.0875 0.032
4.70 0.209 0.030
4.70 0.130 0.043
Concentration of
Lead in Biota Type
(i) 2,3
(B i)
(mg/kg dw)
ln(B i) = 0.561 *
ln(Soil j) - 1.328
where i = plants
ln(B i) = 0.807 *
ln(Soil j) - 0.218
where i = earthworms
ln(B i) = 0.4422 *
ln(Soil j) + 0.0761
where i = mammals
Eco-SSL
(mg/kg dw) 4
1 The process for derivation of wildlife TRVs is described in Attachment 4-5 of U.S. EPA (2003).
2
Parameters (FIR, Ps, Bi values, regressions) are provided in U.S. EPA (2003) Attachment 4-1 (revised February 2005).
3
Bi = Concentration in biota type (i) which represents 100% of the diet for the respective receptor.
4 HQ = FIR * (Soilj * Ps + Bi) / TRV) solved for HQ=1 where Soilj = Eco-SSL (Equation 4-2; U.S. EPA, 2003).
NA = Not Applicable
Eco-SSL for Lead 19
March 2005
1200
56
460