Surface Water/Groundwater Ingestion

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)