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r r � <br /> RBCA SITE ASSESSMENT <br /> Tier 2 Worksheet B.1 <br /> Site Name;McDowell and Davis Towing, 1360 Escalon Site Location:Escalon San Joaquin County Com feted By:Robert FourtCEG/CHG Date Completed 5112!2002 5 OF 9 <br /> TIER 2 EXPOSURE CONCENTRATION AND INTAKE CALCULATION <br /> GROUNDWATER: Exposure Concyrheflan <br /> TOTAL PATHWAY INTAKE(nplkq-day) <br /> VAPOR INTRUSION TO BUILDINGS 1)$ouroe Medium 2)NAF Value(m"3/LS 3)ExposuEl Medium 4)Exposure Multiplier 5)Average Daily Intake Rate tsars bkn vpkms from auburece <br /> Receptor Indoor AN:POE Cane.(mglm^3)($0(2) (IRxEFxEDy(84yxAT) (m-Mg-day) (mgrkp-dsy)(3)X(4) d <br /> grmardwMer rouhr.) <br /> Groundwater Cone. <br /> Constituents of Concern m Onsite CommaeW on site Commerdal On-site Commercial On-Me commercial OnSft Co-" <br /> Benzene 1.1 E-2 5.8E+2 1.9E-5 7.0E-2 1.3E-6 2.9E-0 <br /> Eth (benzene 2.6E-3 5.6E+2 4.7E-6 2.0E-1 9.1E-7 4.8E-2 <br /> Meth I t-But I Ether 1.0E-4 1.6E+3 6.1E-B 2.0E-1 1.2E-8 8.1E-2 <br /> Toluene 3.9E-3 5.8E+26.7E-6 2.0E-1 1.3E-6 7.1E-1 <br /> X Iene mixed isomers 1.1 E-2 6.2E+2 1.8E-5 2.0E-1 3.5E-6 3.7E+0 <br /> NOTE: ABS=Dermal absorption factor(dim) BW=Body weight(kg) EF=Exposure frequencey(dayslyr) POE=Point of exposure <br /> AF=Adherence factor(mgfc n^2) CF=Units conversion factor ET=Exposure time(hrslday) SA=Skin exposure area(em"2lday) <br /> AT=Averaging time(days) ED=Exposure duration(yrs) IR=Inhalation rete(m"31day) <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 />