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Table I Calculation of Risk-Based Screening Levels for Soil <br /> (Construction Worker Scenario) <br /> 2325 and 1515 West Weber Avenue,Stockton,California <br /> VF CSFo CSFi Cs(care) RfDo RfDi Cs(noncarc) Cs <br /> Constituent ABS (m3/kg) (mg/kg-day)-' (mg/kg-day)' (-Wkg) (mg/kg-day) (mg/kg-day) (mg/kg) (-g/kg) <br /> Benzene O.I 2.80E+03 1.00E-01 1.00E-01 4.65E+02 3.00E-03 1.70E-03 1.17E+03 4.7E+02 <br /> Toluene 0.1 3.60E+03 not applicable 2.00E-01 1.10E-01 9.60E+04 9.6E+04 <br /> Ethylbenzene 0.1 4.20E+03 not applicable 1.00E-01 2.90E-01 2.34E+05 2.3E+05 <br /> Xylenes 0.1 4.40E+03 not applicable 2.00E+00 2.00E-01 2.22E+05 2.2E+05 <br /> Equations(Construction Worker) <br /> Cs(care)= risk-based screening level for soil,based on carcinogenic effects <br /> Cs(noncarc)= risk-based screening level for soil,based on noncarcinogenic 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(cart)-(TRL x BW x ATc)/{EF x ED x[(IngR x IE-06 kg/mg x CSFo)+(InhR x CSFi/VF)+(SA x DA x ABS x IE-06 kg/mg x CSFo)]) [volatile constituents] <br /> Cs (noncarc)=[(THI x BW x ATn)/(EF x ED)]x]I/[(IngR x 1E-06 kg/mg/RfDo)+(SA x DA x ABS x IE-06/RfDo)+(InhR x(1/VF)x(I/RfDi))]) [volatile constituents] <br /> Target risk level(TRL)= 0.000001 (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 time(ATn)= 365 days (noncarcinogenic constituents) (USEPA,1989) <br /> Exposure frequency(EF)= 5 days/yr site-specific assumption(construction scenario) <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 /> z W—�._--- - - — - <br /> ��. - -'�-�-- - --Dust adherence'(DA)'=X0'.2"� ��= -.m8/cm' —;:-�::_—,;�--__�-�� --'-= --- (USEPARegion�9,1999) <br /> Inhalation rate(InhR)= 20 m'/day (USEPA,1991) <br /> "ABS='ab'sar hon factbi chemicaCs ecific - USEPA Re pan 9,1999 <br /> VF= volatilization factor(chemical specific) (USEPA Region 9,1999) <br /> CSFo= oral slope factor(chemical specific) (California EPA,1994) <br /> CSFi= 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 />