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l r-": ■ r--1 r--1 r-1: r-1, r-1i r-1i R '1 5-1 it r- r-7 [-,I. r-1, ■ Y r"� r-1i <br /> RBCA SITE ASSESSMENT <br /> Tier 2 Worksheet 8.1 <br /> Site Name:McDowell and Davis To Site Location:Escalon San Joaquin County.CA Completed By:Robert Fours CE Date Completed:5!1212002 8 OF 9 <br /> TIER 2 EXPOSURE CONCENTRATION AND INTAKE CALCULATION <br /> SOIL:LEACHING TO GROUN13WATERI Exposure Concentration <br /> GROUNDWATER INGESTION i I Source Medium 2)NAF Value Wkg) 3)Exposure Medium 41 ExogsureHLltiptier 5)Average Daily Intake Rate <br /> Receptor Groundwater:POE Cera.(mg4)(I Y(2) (IRxEFXEDV(BWxAT) (Lfkg.dey) (mgrkp-dayF(3).(4) <br /> I Soil Concentration <br /> Constituents of Concern m Off-Site eommerdat Off-Site Cemmerdel og-She Commerdal ORSite Cammerdal <br /> Benzene 4.3E-1 1.2E+4 3,5E-5 3.5E-3 1.2E-7 <br /> Eth (benzene 2.6E+1 I 7.7E+4 3.3E-4 9.8E-3 3.3E-6 <br /> Methyl t-Butyl Ether4.4E+1 1.1 E+4 3.8E-3 9.8E-3 3.7E-5 <br /> Toluene 6.0E+1 5.2E+8 1.2E-7 9.8E-3 1.1E-9 <br /> I <br /> Xylene mixed isomers 2.0E+3 1.1E+5 1.8E-2 9.8E 3 1.8E <br /> NOTE: AHS=Dermal absorption factor(Mm) SW=Body Weight(kg) EF a Exposure frequencey(days" POE=Point of exposure <br /> AF=Adherance Tactor(mglan"2) CF=Units conversion factor ET»Exposure time(hrsvday) SA=Skin exposure area(rsn"vdey) <br /> AT=Averaging time(days} ED=Exposure duration(yrs) $R=Intake rate(11day) <br /> Software: GSI RBCA Spreadsheet Serial: G-491-EFX-4972 <br /> *Groundwater Services,Inc (GSI),1995-1997.All Rights Reserved. Version: 1.0.1 <br /> I <br /> l <br /> i <br />