(5)Equation 5 (non-radionuclides) and Table 4 present the exposure variables for the soil/sediment dermal contact pathway for the residential, industrial, and recreational scenarios.
(5)
Table 4. Soil/Sediment Dermal Contact Parameters
|
Parameter |
Units |
Residential |
Industrial |
Recreational |
Agricultural |
|
Non-radionuclide chemical concentration in soil = Csn |
mg/kg |
Chemical-specific |
Chemical-specific |
Chemical-specific |
Chemical-specific |
|
Conversion factor = CF4 |
(kg-cm2)/ (mg-m2) |
0.01 |
0.01 |
0.01 |
0.01 |
|
Surface area = SA |
m2/day |
0.53 Hand, forearms, head lower legs (EPA 1992) |
0.316 Hands, forearms, head (EPA 1992) |
0.53 Hand, forearms, head lower legs (EPA 1992) |
0.53 Hand, forearms, head lower legs (EPA 1992) |
|
Adherence factor = AF |
mg/cm2 |
1 (EPA 1992) |
1 (EPA 1992) |
1 (EPA 1992) |
1 (EPA 1992) |
|
Absorption factor = ABS |
unitless |
0.01 (organic) 0.001 (inorganic) (EPA 1995) |
0.01 (organic) 0.001 (inorganic) (EPA 1995) |
0.01 (organic) 0.001 (inorganic) (EPA 1995) |
0.01 (organic) 0.001 (inorganic) (EPA 1995) |
|
Exposure frequency = EF |
day/yr |
350 (EPA 1991) |
250 (EPA 1991a) |
40 (EPA 1992) |
350 (EPA 1991) |
|
Exposure duration = ED |
years |
30 (EPA 1989a) |
25 (EPA 1991a) |
30 (EPA 1989a) |
30 (EPA 1989a) |
|
Body weight = BW |
kg |
70 (adult) (EPA 1991a) |
70 (adult) (EPA 1991a) |
70 (adult) (EPA 1991a) |
70 (adult) (EPA 1991a) |
|
Conversion Factor = CF2 |
days/yr |
365 |
365 |
365 |
365 |
|
Lifetime = LT |
years |
70 (EPA 1989a) |
70 (EPA 1989a) |
70 (EPA 1989a) |
70 (EPA 1989a) |
|
Averaging time = AT |
years |
LT (carcinogen) ED (noncarcinogen) |
LT (carcinogen) ED (noncarcinogen) |
LT (carcinogen) ED (noncarcinogen) |
LT (carcinogen) ED (noncarcinogen) |