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FIGURE 6: DERIVATION OF HAZARD EQUATION FOR SOIL <br /> Original Equation: <br /> Hazards.;, _ (1/RfD.) x CS x IRs x EF x ED x 10'6 kq/mg <br /> BW x AT x 365 day/yr <br /> + (1/RfD.) x CS x SA x AF x ABS x EF x ED x 10"6 kq/mq <br /> BW x AT x 365 days/yr <br /> Default exposure factors (based on childhood exposure from birth to six <br /> years of age): <br /> IRS = incidental soil ingestion rate = 200 mg/day <br /> EF = exposure frequency, 350 days/year for soil ingestion and dermal <br /> contact (EPA, 1991) <br /> ED = exposure duration = 6 years <br /> BW = body weight = 15 kg (USEPA, 1991 a) <br /> AT = averaging time = 6 years <br /> SA = skin surface area exposed = 2,000 cm2 <br /> AF = soil to skin adherence factor = 1 mg/cm2 (USEPA, 1992a) <br /> ABS = absorption fraction of chemical from soil (See Table 3) <br /> Reduced Equation: <br /> Hazards.;, _ [(CS/RfD.) x 1.28 x 10"5)] + [(CS/RfDo) x 1.28 x 10-4 x ABS] <br />