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0 <br /> RBCA SITE ASSESSMENT <br /> Tier 2 Worksheet 8.2 <br /> Site Name:Formeer Regal 603 Site Location:6425 Pacific Aenue Stockton CA Completed By:Roy Butler Dale Completed:711011998 4 OF 4 <br /> TIER 2 PATHWAY RISK CALCULATION <br /> i <br /> GROUNDWATER EXPOSURE PATHWAYS ■ CHECKED IF PATHWAYS ARE ACTIVE) <br /> CARCINOGENIC RISK TOXIC EFFECTS <br /> (2)total Carcinogenic (3)Oral (4)Individual GOC 15)Total Toxicant (6)Oral (7)Individual COC <br /> (1)EPA Intake Rate(mglkWday) Slope Factor Risk(2)x(3) Intake Rate(mglkglday) Reference pose Hazard Quotient(5)1(6) <br /> Carcinogenic On-Site Off-Site On-Site Off-Site On-Site Off•Sde On-Site Ofi-Site <br /> Constituents of Concern Class ication Commercial Residential m/ -da ^-1 Commercial Residential Commercial Residential m -d Commercial Residential <br /> Benzene A 1.5E-4 5.2E-14 2.9E-2 4.5E-6 1.5E-15 <br /> Eth (benzene D 3.0E-3 8.5E-13 1.0E-1 3.0E-2 8.5E-12 <br /> Hexane n- 1.0E-1 2.9E-11 6,oE-2 1.7E+0 4.8E-10 <br /> Methyl t-But I Ether 1.1E-3 3.2E-13 5.0E-3 2.3E-1 6.4E-11 <br /> Toluene D 4.8E-3 1.4E-12 2.0E-1 2.4E-2 6.8E-12 <br /> Xylene mixed isomers D 2.1E-2 5.9E-12 2.0E+0 1.1E-2 2.9E-12 <br /> Total Pathway Carcinogenic Risk= 4.5E-6 1.5E-15 Total Pathway Hazard Index= 2.0E+0 5.6E-10 <br /> Sortware, GSI RBCASpreadsheet Serial, G-443-CSX-444 <br /> 0 Groundwater Services,Inc.(GSI),1995.1997.All Rights Reserved. Version; 1,0,1 <br /> i <br />