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Tier 2 Worksheet 9.2 <br /> RBCA SITE ASSESSMENT <br /> Site Name:McDowell and Davis Towing,1360 Escalon Ave Completed By:Robert Fourt,CEG!CHG <br /> Site Location:Escaion,San Joaquin County,CA Date Completed 12/32002 1 OF 1 <br /> Target Risk(Class A 5 61 1.0E-6 ■ MCL exposure limit? Calculation Option: 3 <br /> SUBSURFACE SOIL SSTL VALUES Target Risk(CtassC) 1.0E-5 ■ PELexposure limit? Groundwater DAF Option: Domenico-First Order <br /> >0 FT BGS) Target Hazard Quotient 1 DE+o (Two-directional vert dispersion) <br /> SSTL Results For Complete Exposure Pathways("X'If complete) <br /> Representative <br /> Concentration Soil Volatilization to Soil Volatilization to Applicable SSTL <br /> CONSTITUENTS OF CONCERN X Soil Leaching to Groundwater X Indoor Air X Outdoor Air SSTL Exceeded? Required CRF <br /> Residential: Commercial: Regulatory(MCL): Residential: Commercial: Residential: Commercial: <br /> CAS No. Name mgfkg) (on-srte) 750 feet 750 feet (onsite) (on-site)(PEL) 250 feet (on-siteXPEL) (mgrkg) "■"If yes Only if"yes'left <br /> 71-43-2 Benzene 4.3E-1 NA 1.0E+2 5.3E+1 NA >Res 9.6E+1 >Res 5.3E+1 ❑ <1 <br /> 100-41-4 Ethylbenzene 2.6E+1 NA >Res >Res NA >Res >Res >Res >Res 1 ❑ <1 <br /> 163404-4 Meth t-Butyl.Ether 4.4E+1 NA >Res NA NA >Res >Res >Res >Res ❑ <1 <br /> 108488-3 Toluene 6.0E+1 NA >Res >Res NA >Res >Res I >Res >Res ❑ <i <br /> 1330-20-7 X enc mixed isomers 2.0E+2 NA >Res >Res NA >Res >Res >Res >Res ❑ 1 <1 <br /> >Res indicates risk-based target concentration greater than constituent residual saturation value <br /> Software:GSI RBCA Spreadsheet Serial: G-491-EFX-872 <br /> C Groundwater Services,Inc.(GSI),1995-1997.All Rights Reserved. Version: 1.0.1 <br /> s <br /> 1 <br /> r <br />�I <br /> iii <br />