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ft <br /> RBCA SITE ASSESSMENT Tier 2 Worksheet 8.2 <br /> Site Name:McDowell and Davis Towing, 136 Site Location:Escalon San Joa uin County,CA Com leted t3 Robert FouR CEG!CHG Date Com feted: 12/3/2002 2 OF 4 <br /> TIER 2 PATHWAY RISK CALCULATION <br /> .-- <br /> a _ <br /> CARCINOGENIC RISK TOXIC EFFECTS <br /> (2)Total a(mgAgenic -Sl Inhalation (4)Indivrdual COC (5)Total Toxicant (6)Inhalation 7 Individual COC <br /> (1)EPA Intake Rate(mgAtglday) Slope Factor Risk(2I x 3 In ( ) <br /> O take Rafe <br /> {mgAcglday) Reference Dose Hazard Quotient(5)!(6) <br /> Carcinogenic On-Sita Onsite On-Site <br /> Constituents of Concern Classification Commercial mgrk -7 Commercial Onsite <br /> Commercial <br /> Benzene A 2.4E-4 2.9E-2 7.1E �a Commercial <br /> 6.8E 4 1.7E-3 <br /> Eth (benzene D 3.3E-2 2.9E-1E4.0E-1 <br /> Meth t-B Ether 2.1E-2 8.6E-1 1.1E-1 <br /> Toluene D 2.5E-2 <br /> 5-9E-2 1.1E-1 <br /> X ene mixed isomers D 5.1E-1 <br /> 1.3E-1 2.0E+0 6.3E-2 <br /> Total Pathway Carcinogenic Risk= 0.0E+0 7.1E-6 Total Pathway Hazard Index= 0.0E+01.1E+0 <br /> Software: GS]RBCA Spreadsheet Serial:G791-EFX-872 <br /> 0 Groundwater Services,Inc.(GSI),1995-1997.All Rights Reserved. Version: 1.0.1 <br /> I <br />