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Bev W <br /> Table 9 <br /> Calculation of Risk-Based Screening Levels for Solt <br /> (Construction Worker Scenario) <br /> Former Heinz Fatality <br /> Tracy,California <br /> VF CSFo CSFs Cs(cart) RfDo RfDi Cs(noncarc) Cs <br /> Constituent ABS (-/kg) (-Wkg-day)' (mg/kg-day)' (mg/kg) (mg/kg-day) (nWkg-day) (mg/kg) (mg/kg) <br /> Benzene 01 2 SOE+03 1 OOE 01 1 OOE-01 4 65E+02 3 DOE-03 1701,03 1 17E+03 4 7E+02 <br /> Toluene 01 3 60E+03 not applicable 2 GOF-01 1 1DE-01 9 60E+04 9 6E+04 <br /> Ethylbenzene 01 4 20E+03 not applicable 1 OOE-01 2 90E-01 2 34E+05 2 3E+05 <br /> Xylenes 01 4 40E+03 not applicable 2 00E+00 2 OOE-01 2 22E+05 2 2E+05 <br /> Equations(Construction Worker) <br /> Cs(cart)= risk-based screening level for sod,based on carcinogenic effects <br /> Cs(noncarc)= risk-based screening level for sod,based on noncarcmogenic effects <br /> Cs= risk-based screening level,based on minimum of Cs(care)and Cs(noncarc)[Note Cs is rounded to two significant figures to reflect the precision of the calculation] <br /> Cs(care)=(TRL x BW x ATc)/(EF x ED x[(IngR x 1E-06 kg/mg x CSFo)+(InhR x CSFs/VF)+(SA x DA x ABS x]E-06 kg/mg x CSFo)]) [volatile constituents] <br /> Cs (noncarc)=[(THI x BW x ATn)/(EF x ED)]x]1/[(IngR x 11-06 kg/mg/RfDo)+(SA x DA x ABS x 1E-06/RfDo)+(hihR x(1/VF)x(1/RfDi))]) [volatile constituents] <br /> I <br /> Target risk level(TRL)= 0000001 (dimensionless) (DTSC,1994) <br /> Target hazard index(THI)= 1 (dimensionless) (DTSC,1994) <br /> Body weight(BW)= 70 kg (USEPA,1989) <br /> Averaging time(ATc)= 25550 days (carcinogenic constituents) (USEPA,1989) <br /> Averaging tune(ATn)= 365 days (noncarcinogenic constituents) (USEPA,1989) <br /> Exposure frequency(EF)= 5 days/yr site-specific assumption(construction scenano) <br /> Exposure duration(ED)= 1 yrs site-specific assumption(construction scenario) <br /> Soil ingestion rate(IngR)= 480 mg/day (USEPA,1991) <br /> Skin surface area(SA)= 3300 cm2/day (USEPA Region 9,1999) <br /> Dust adherence(DA)= 02 2 (USEPA Region 9,1999) <br /> Inhalation rate(InhR)= 20 m3/day (USEPA,1991) <br /> ABS= absorption factor(chemical specific) (USEPA Region 9,1999) <br /> VF= volatilization factor(chemical specific) (USEPA Region 9,1999) <br /> CSFo= oral slope factor(chemical specific) (California EPA,1994) <br /> CSFs= inhalation slope factor(chemical specific) (California EPA,1994) <br /> RfDo= oral reference dose(chemical specific) (USEPA Region 9,1999) <br /> RfDi= inhalation reference dose(chemical specific) (USEPA Region 9,1999) <br />