(13)Equation 13 (non-radionuclides), equation 14 (radionuclides), and Table 10 present the exposure variables for the surface water/groundwater ingestion pathway. This pathway is conducted for the residential, industrial, and inhalation pathways.
(13)
(14)
Table 10. Surface Water/Groundwater Ingestion Parameters
|
Parameter |
Units |
Residential |
Industrial |
Recreational |
Agricultural |
|
Non-radionuclide chemical concentration in water = Cwn |
mg/L |
Chemical-specific |
Chemical-specific |
Chemical-specific |
Chemical-specific |
|
Radionuclide chemical concentration in water = Cwr |
pCi/L |
Chemical-specific |
Chemical-specific |
Chemical-specific |
Chemical-specific |
|
Ingestion Rate = IRw |
L/d |
2 (EPA 1989a) |
1 (EPA 1991a) |
.05 (EPA 1995) |
2 (EPA 1989) |
|
Exposure frequency = EF |
d/year |
350 (EPA 1989a) |
250 (EPA 1991a) |
40 (EPA 1992) |
350 (EPA 1989a) |
|
Exposure duration = ED |
years |
30 (EPA 1989a) |
25 (EPA 1991a) |
30 (EPA 1989a) |
30 (EPA 1989a) |
|
Body weight = BW |
kg |
70 (EPA 1989a) |
70 (EPA 1989a) |
70 (EPA 1989a) |
70 (EPA 1989a) |
|
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) |