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r_7 r__"' (_7 <br /> r� <br /> RIBCA SITE ASSESSMENT <br /> Cumulative Risk Worksheet <br /> Site Name McDowell and Davis Towing, 1360 Escalon Completed By:Robert Fourt,CEG I CHG <br /> Site Location:Escalon,San Joaquin County,CA Date Completed:11/15/2003 3 OF 3 <br /> Cumulative Target Risk, 1.0E-4 Target Hazard Index: 1.0E+0 <br /> CUMULATIVE RISK WORKSHEET <br /> Groundwater DAF Option: Domenico-First Order <br /> OFF-SITE RECEPTORS <br /> Outdoor Air: Groundwater: <br /> Residential Exposure Commercial Exposure <br /> Target Risk: Target HQ: Target Risk: Target HQ: <br /> CONSTITUENTS OF CONCERN 1.0E-5I 1.0E-5 1.0E+0 1.0E-6I 1.0E-5 1.0E+0 <br /> Carcinogenic Hazard Carcinogenic Hazard <br /> CAS No. Name Risk Ouotient Risk Quotient <br /> 71-43-2 Benzene 4.6E-11 12E-6 1.0E-11 <br /> 100-41-4 Eth /benzene 6.2E-7 8.0E-11 <br /> 1634-04-4 Methyl t-Butyl Ether 1.5E-7 2.3E-6 <br /> 108-88-3 Toluene 2.8E-6 3.0E-26 <br /> 1330-20-7 Xylene mixed isomers 3.4E-7 1.1E-11 <br /> Cumulative Values: 4.6E-11 6.0E-6 1.0E-11 2.3E-6 <br /> • indicates risk level exceeding target risk <br /> Software, GSI RBCA Spreadsheet Serial: G-491-EFX-872 <br /> ®Groundwater Services,Inc.(GSI),1995-1997. Version: 1.0.1 <br />