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Table 2 Calculation ofVrget Levels for Air U <br /> (Industrial Worker Scenario and Construction Worker Scenario) <br /> 1325 and 1515 West Weber Avenue,Stockton, California <br /> Industrial Worker Scenario <br /> CSFi Ca(care) ; RfDi Ca(noncarc) Target Level <br /> Constituent (mg/kg-day)' (pg/m) (mg/kg-day) (p6/m) <br /> Benzene 1.00E,01 1.43E-01 I.70E-03 8.69E+00 1.431-01 <br /> Toluene not applicable 1.10E-01 5.62E+02 5.62E+02 <br /> Ethylbenzene not applicable 2.90E-01 1.48E+03 1.48E+03 <br /> Xylenes(Mixture) not applicable I1 2.0001 1.02E+03 1.02E+03 <br /> 1,2-Dichloroethane 7.04E-02 2.04&01 :1 1.40&03 7.15E+00 2.04E-01 <br /> 1,35-Trimethylben7ene not applicable 3j 1.701-03 8.69E+00 8.69E+00 <br /> 1,2,4-Trimethylbenzene not applicable 1.70E-03 8.69E+00 8.69E+00 <br /> Equations <br /> �3 <br /> Ca(care)= site-specific screening level,based on carcinogenic:effects <br /> Ca(noncarc)= site-specific screening level,based on noncarcinogenic effects <br /> Target Level= minimum of Ca(care)and Ca(noncarc) �' <br /> Ca(care,pg/m3)=(1000 pg/mg x Target Risk x BW x ATc)/(EF x ED x InhR x CSFi) <br /> Ca (noncarc,ug/m3)=(1000 pg/mg x THI x BW x ATn)/[EF x ED x lnhR x(1/RfDi)] <br /> Ih Target Risk= 0.000001 (dimensionless) ij (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 (USEPA,1989) <br /> Averaging time(ATn)- 9125 days (USEPA,1989) <br /> Exposure frequency(EF)= 250 days/yr �) (USEPA,1991) <br /> Exposure duration(ED)= 25 yrs (USEPA,1991) <br /> Inhalation rate(InhR)= 20 m3/day iJ (USEPA,1991) <br /> CSFi= inhalation slope factor(chemical specific)h (California EPA,1994) <br /> RfDi= inhalation reference dose(chemical specific) (USEPA Region 9,1999) <br /> Construction Worker Scenario ; <br /> CSFi Ca(care) jj RfDi Ca(noncarc) Target Level <br /> Constituent (mg/kg-day)-- (ug/-) Qng/kg_4aa (pg/m) (pg/m) <br /> Benzene 1.00E-01 1.79E+02 i 1.701103 4.34E+02 1.79E+02 <br /> f Toluene not applicable it 1.10E-01 2.81E+04 2.81E+04 <br /> t Ethylbenzene not applicable 2.901=01 7.41E+04 7.41E+04 <br /> Xylenes(Mixture) not applicable ' 2.00&01 5.11E+04 5.17E+04 <br /> 1,2-Dichloroethane 7.00E-02 2.56E+02 0 1.401-03 3.58E+02 2.56E+02 <br /> 1,3,5-Trimethylbenzene not applicable i.1.70E-03 4.34E+02 4.34E+02 <br /> 1,2,4-Trimethylbenzene not applicable 1�1.70E-03 4.34E+02 4.34E+02 <br /> .a <br /> I' <br /> 3 <br /> Equations <br /> Ca(cart)= site-specific screening level,based on carcinogenic effects <br /> Ca(noncarc)= site-specific screening level,based on noncarcinogenic effects <br /> Target Level= minimum of Ca(care)and Ca(noncarc) <br /> Ca(care,pg/m)=(1000 pg/mg x Target Risk x BW x ATc)/(EF x ED x hihR x CSFi) <br /> Ca (noncarc,gg/m3)=(1000 pg/mg x THI x BW x ATn)/[EF x ED x InhR x(1/RfDi)] <br /> Target Risk= 0.000001 (dimensionless) 1 (DISC,1994) <br /> Target Hazard Index(THI)= 1 (dimensionless) (DTSC,1994) <br /> Body weight(BW)= 70 kg ii (USEPA,1989) <br /> Averaging time(ATc)= 25550 days (USEPA,1989) <br /> Averaging time(ATn)= 365 days <br /> (USEPA,1989) <br /> Exposure frequency(EF)= 5 days/yr (site-specific assumption) <br /> Exposure duration(ED)= 1 yrs (site-specific assumption) <br /> Inhalation rate(InhR)= 20 m3/day (USEPA,1991) <br /> CSFi= inhalation slope factor(chemical specific) 4 (California EPA,1994) <br /> R1Di= inhalation reference dose(chemical specific) (USEPA Region 9,1999) <br />