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Phase It Environmental Site Assessment <br /> Mountain House Neighborhood G <br /> July 9,2002 <br /> Page 9 <br /> The preceding formula is modified for inhalation exposure to dusts by adding the inhalation rate variable <br /> (pg. B-13): <br /> Riskai,=SFi x Ca x 0.294 <br /> Where: <br /> SFi = inhalation cancer slope factor, (mg/kg-day)-1 <br /> Ca=Concentration in air(mg/m')=Cso;l(ing/kg)x 5 x 10$kg/m;(conversion factor from PEA, P. 2-30) <br /> and the numeric coefficient is generated from the following default exposure factors: <br /> B W= body weight=adult 70 kg,child, IS kg <br /> AT= averaging time (exposure)=70 yrs. <br /> EF =exposure frequency=365 day/yr. <br /> ED=exposure duration =30 yrs. (adult), 18 yrs. (child) <br /> IR= inhalation rate=20 m'/day(adult), 10 M3/day(child) <br /> The reduced formula for the hazard due to soil by oral and dermal routes(pg. B-12) is: <br /> Hazard,ojl= [(Cs/RfDo)x 1.33 x 10-5)] +[(Cs/RfDo)x 1.33 x 10-4 x ABS] <br /> Where: <br /> Cs=concentration in soil(mg/kg) <br /> RfDo =Oral reference dose <br /> ABS=absorption fraction of chemical from soil <br /> F and numeric coefficients were generated based on the following default exposure factors: <br /> (` IRs= ingestion rate for soil 200 mg/day(child) <br /> BW= body weight=child, 15 kg <br /> AT=averaging time(exposure)= 18 yrs(child) <br /> EF=exposure frequency=365 day/yr. <br /> ED=exposure duration = 18 yrs.(child) <br /> SA=skin surface area=2000 CM2/day(child) <br /> AF=adherence factor, 1 mg/cm2 <br /> The preceding formula is modified for inhalation exposure to dusts by adding the inhalation rate variable <br /> (pg. B-14): <br /> Hazard,;,=(1/RfDi)x Ca x 0.667 <br /> Where: <br /> RfDi=reference dose inhalation <br /> Ca=Concentration in air(mg/m3)=Coil(mg/kg)x 5 x 10-8 kg/m' (conversion factor from PEA, P. 2-30) <br /> and the numeric coefficient is generated from the following default exposure factors: <br /> BW= 15 kg(child) <br /> AT=averaging time(exposure)= 18 yr <br /> EF=exposure frequency=365 day/yr <br /> ED=exposure duration = 18 yr <br /> IR=inhalation rate = 10 m'/day <br /> Oral RID values were used for dermal and inhalation exposures for all COPC when RfD inhalation values <br /> were not available. Tables containing the calculated risk and hazard values are included in Appendix B. <br /> w <br /> i� CONDOR <br />