Soil/Sediment Dermal Contact

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.

 

image\v4ht0203.gif   (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)