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r r r r r r r r r r r r r r r r r { r <br /> RBCA SITE ASSESSMENT <br /> Tler 2 Worksheet 8.2 <br /> Site Name:McDowell and Davis Towing, 136 Site Location:Escalon,San Joaquin County.CA Completed By:Robert Fourt,CEG 1 CHG Date Com leted:5/1212002 9 OF 4 <br /> TIER 2 PATHWAY RISK CALCULATION ' <br /> CARCINOGENIC RISK TOXIC EFFECTS <br /> (2)Total Carcinogenic (3)Inhalation (4)Individual COC (5)Total Toxicant (6)Inhalation (7)Individual COC <br /> (1)EPA Intake Rate(mglkg1day) Slope Factor Risk(2)x(3) Intake Rate(mg/kg/day) Reference Dose Hazard Quotient(5)1(6) <br /> Carcinogenic On-Site Off-Site On-Site Off-Site On-Site OH-Site On-site Off-Site <br /> Constituents of Concern Classification Commercial Residential -e •-t Commercial Residential Commercial, Residential m ila Commercial Residential <br /> Benzene A 1.6E-7 2.2E-7 2.9E-2 4.7E-9 6.5E-9 4.5E-7 5.2E-7 1.7E-3 2.7E-4 3.1E-4 <br /> Eth (benzene D 2.7E-5 3.1E-5 2.9E-1 9.3E-5 1.1E-4 <br /> Meth t-Butyl Ether 4.6E-5 5.3E-5 8.6E-1 5.3E-5 6.2E-5 <br /> Toluene D 6.3E-5 7.3E-5 1.1E-1 5.5E-4 6,4E-4 <br /> X lane mixed isomers D 2.1 E-3 2.4E-3 2.0E+0 1.0E-3 1.2E-3 <br /> Total Pathway Carcinogenic Risk= 4,7E-9 6.5E-9 Total Pathway Hazard Index 2.0E-3 I 2.3E-3 <br /> Software-GSI RBCA Spreadsheet Serial, G-491-EFX-872 <br /> ®Groundwater Services,Inc (GSI),1995-1997,All Rights Reserved. Version: 1.0.1 <br />