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Table 9 Calculation of Risk-Based Screenmg Levels for Soil (Construction Worker Scenario) Former Heinz Facility Tracy California VF CSFo CSFs Cs(care) RfDo RfDt Cs(noncarc) Cs Constituent ABS (-s/kg) (mg/kg-day)s (-6/kg—day)' (mg/kg) (mg/kg-day) (-Wkg-day) (mg/kg) (mg/kg) Benzene 01 2 80E+03 1 OOE-01 1 OOE-01 4 65E+02 3 OOE-03 170E-03 1 17E+03 4 7E+02 Toluene 01 3 60E+03 not applicable 2 OOE-Ol 1 lOE-01 9 60E+04 9 6E+04 Ethylbenzene 01 4 20E+03 not applicable 100E-01 2 90E-01 2 34E+05 2 3E+05 Xylenes 01 4 40E+03 not applicable 2 DOE+00 2 OOE-01 2 22E+05 2 2E+05 Equations(Construction Worker) Cs(cart)= rtsk-based screening level for soil,based on carcinogenic effects Cs(noncarc)= risk-based screening level for soil,based on noncarcuiogenic effects Cs= nsk-based screening level,based on nur rn m of Cs(care)and Cs(noncarc)[Note Cs is rounded to two significant figures to reflect the precision of the calculation] Cs(care)=(TRL x BW x ATc)/(EF x ED x[(ingR x 1E-06 kg/mg x CSFo)+(InhR x CSFt/VF)+(SA x DA x ABS x 1E-06 kg/mg x CSFo)]) [volatile constituents] Cs (noncarc)=[(TI-fI x BW x ATn)/(EF x ED)]x(1/[(IngR x 1E-06 kg/mg/RfDo)+(SA x DA x ABS x 1E-06/RfDo)+(InhR x(1/VF)x(I/RfDt))]) [volatile constituents] Target risk level(TRL)= 0000001 (dimensionless) (DTSC,1994) Target hazard index(THI)= 1 (dimensionless) (DTSC,1994) Body weight(BW)= 70 kg (USEPA,1989) Averaging tune(ATc)= 25550 days (carcinogenic constituents) (USEPA,1989) Averaging tune(ATn)= 365 days (noncarcmogemc constituents) (USEPA,1989) Exposure frequency(HF)= 5 days/yr site-specific assumption(construction scenario) Exposure duration(ED)= 1 yrs site-specific assumption(construction scenario) Soil ingestion rate(IngR)= 480 mg/day (USEPA,1991) Skin surface area(SA)= 3300 cm2/day (USEPA Region 9,1999) Dust adherence(DA)= 02 mg/crn2 (USEPA Region 9,1999) Inhalation rate(InhR)= 20 m3/day (USEPA,1991) ABS= absorption factor(chemical specific) (USEPA Region 9,1999) VF= volatilization factor(chemical specific) (USEPA Region 9,1999) CSFo= oral slope factor(chemical specific) (California EPA,1994) CSFs= inhalation slope factor(chemical specific) (California EPA,1994) RfDo= oral reference dose(chemical specific) (USEPA Region 9,1999) Mi= inhalation reference dose(chemical specific) (USEPA Region 9,1999)