Surface Water/Groundwater Dermal Contact
Equation 17 (non-radionuclides) and Table 12 present the exposure variables for the surface water/groundwater dermal contact pathway. This pathway is conducted for the residential, recreational, and agricultural scenarios only. The industrial scenario has the skin surface area exposed set to 0 m3 and the exposure time is set to 0 hours.
(17)
Table 12. Surface Water/Groundwater Dermal Contact 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
Skin surface area exposedc = SA
m2
1.94
(EPA 1989a)
0
1.94
(EPA 1989a)
1.94
(EPA 1989a)
Skin permeability constant = Pc
cm/hr
Chemical-specific
Chemical-specific
Chemical-specific
Chemical-specific
Conversion Factor = CF6
(L-m)/
(cm-m3)
10
10
10
10
Exposure duration = ED
years
30
(EPA 1989a)
25
(EPA 1991a)
30
(EPA 1989a)
30
(EPA 1989a)
Exposure frequency = EF
events/yr
350
(EPA 1989a)
250
(EPA 1991a)
40
(EPA 1992)
350
(EPA 1989a)
Exposure time = ET
hrs/event
0.2
(EPA 1992)
0
2.6
(EPA 1989a)
0.2
(EPA 1992)
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)