Surface Water/Groundwater Indoor Inhalation

Equation 15 (non-radionuclides), equation 16 (radionuclides), and Table 11 present the exposure variables for the surface water/groundwater inhalation pathway from showering and from indoor water use. This pathway is conducted for the residential and agricultural scenarios only. The industrial and recreational default intake rates are set to 0 m3/day.

 

image\v4ht0213.gif  (15)

 

image\v4ht0214.gif  (16)

 

Table 11. Surface Water/Groundwater Inhalation while Showering 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

 

Volatilization Factor = VF

 

L/m3

 

Chemical-specific

 

Chemical-specific

 

Chemical-specific

 

Chemical-specific

 

Inhalation rate = IRair

 

m3/hour

 

20

(EPA 1989a)

 

0

 

0

 

20

(EPA 1989a)

 

Exposure frequency = EF

 

day/year

 

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)

 

Inhalation exposure factor = IEF

 

(L hr)/

(m3 day)

 

0.2802 (Tritium)

7.603 (Radon)

0 (other radionuclides)

 

0.2802 (Tritium)

7.603 (Radon)

0 (other radionuclides)

 

0.2802 (Tritium)

7.603 (Radon)

0 (other radionuclides)

 

0.2802 (Tritium)

7.603 (Radon)

0 (other radionuclides)

 

Body weight = BW

 

kg

 

70

(EPA 1989a)

 

70

(EPA 1989a)

 

70

(EPA 1989a)

 

70

(EPA 1989a)

 

Conversion Factor = CF9

 

days/hr

 

1/24

 

1/24

 

1/24

 

1/24

 

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)