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r r t r r r r r r r r r r r r r r r r <br /> RBCA SITE ASSESSMENT <br /> Tier 2 Worksheet 8.1 <br /> Site Name:McDowell and Davis To Site Location:Escalon San Joa uin County.,CA Completed B :Robert FourtCEG!CHG Date Completed:5/12/2002 9 OF 9 <br /> TIER 2 EXPOSURE CONCENTRATION AND INTAKE CALCULATION <br /> GROUNDWATER:INGESTION Exposure Concentration MAX.PATHWAY INTAKE(mgfkyday) <br /> 1)Source Medium 2)NAF Value flim) 3)Exposure Medium 4)Exposure Multiplier 5)Average Daily Intake Rate (Maranon kdmv of Wff"pafiways <br /> Receptor Groundwater:POE Cow-(mg'L)(1M pRxEGxE0N(BWxAT) (L1kg-day) (mgfkg W(31x(4) sax raselft A grouMwahr mems) <br /> Groundwater Conc. <br /> Constituents of Concern L Off-SR.Cammerdal OS-Site CommerdN Off-Ste Commercial 011-Ske Commerdat 011-51141 ComnrerdN <br /> Benzene 1.1 E-2 8.2E+2 1.3E-5 3.5E-3 4,7E-8 i.2E-7 <br /> Eth !benzene 2.6E-3 3.4E+3 7.6E-7 9.8E-3 7.4E-9 3.3E-6 <br /> Methyl t-But I Ether 1.0E-0 1.3E+3 7.9E-8 9.8E-37.7E-10 3.7E-5 <br /> Toluene 3.9E-3 2.0E+7 1.9E-10 9.8E-3 1.9E-12 1.1 E-9 <br /> Xylene fmixed isomers 1.1E-2 3.0E+3 3.7E-6 9.8E-3 3.6E-8 1.8E-4 <br /> NOTE: ABS=Dermal absorption factor(dim) BW=Body weight(kg) EF=Exposure frequenoey(dayslyq POE-Point of exposure <br /> AF=Adherence factor(mgfe m'2) CF=Units conversion factor ET=Exposure time(testday) SA=Skin exposure area(Grn"2lday) <br /> AT=Averaging time(days) ED=Exposure duration(yrs) IR=Intake rate(Lrday) <br /> Software:GSI RBCA Spreadsheet Serial:G-491-EFX-872 <br /> ®Groundwater Services,Inc.(GSI),19951997.All Rights Reserved. Version: 1.0.1 <br />