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Dames & Moore, 1999 - USDA Forest Service

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ingestion of Water<br />

Screening criteria based on ingestion of water are developed assuming a child's exposure. Equations for this<br />

pathway are as follows:<br />

Carcinogens:<br />

Noncarcinogens:<br />

Ingestion of Fish<br />

where:<br />

Screening Criteria (ugA)=<br />

RISK x ABWl x LIFE x UCF<br />

CPF x DWIR x DURl x MH x FOCI<br />

Screening Criteria (ug~l) = RfDxABWIxUCFxHQ<br />

DWIRxMHxFOCl<br />

RISK = Acceptable cancer risk level (unitless)<br />

ABW 1 = Average body weight over period of exposure (kg)<br />

LIFE = Lifetime (years)<br />

UCF = Unit conversion factor (1,000 pg/mg)<br />

RfD = Reference dose (mgkg-day)<br />

DWIR = Water ingestion rate (Vday)<br />

DURl = Duration of exposure (years)<br />

FOCl = Frequency of contact (unitless)<br />

MI4 = Inhalation correction factor (unitiess)<br />

CPF = Cancer potency factor (kg-daylmg)<br />

Screening criteria based on ingestion of fish in surface water are developed assuming an adult's exposure.<br />

Equations for this pathway are as follows:<br />

Carcinogens:<br />

RISK x ABW-I x LIFE x UCF1 x UCF2<br />

Screening Criteria (ug/l) =<br />

CPF x BCF x FCR x FDF x DURl<br />

G:\~UX)~\holdrn-2\ri\74.doc 7-28<br />

176934054 IWuly, 27.<strong>1999</strong>;J: 16 PM:DRAFT FINAL RI REPORT

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