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RBCA Tool Kit for Chemical Releases,Version 1.3 <br /> RBCA SITE ASSESSMENT <br /> 6OF7 <br /> TIER 2 EXPOSURE CONCENTRATION AND INTAKE CALCULATION <br /> OUTDODR.AIR.EXPOSURE PATHWAYS <br /> GROUNDWATER:VAPOR <br /> INHALATION (cont'd) 4)Exposure Multiplier 5)Average Inhalation Exposure <br /> (EFxED)1(ATx365) (unTlless) Concentration(mgrm^3)(3)x(4) <br /> Off-site 1 Off-site 2 Off-site 1 Off-site 2 <br /> On-site(0 ft} (o ft) (o ft) On-site{0 ft} (o ft) (o ft) <br /> Constituents of Concern Residential None None Residential None None <br /> Benzene 4.1 E-1 6.8E-11 <br /> Ethylbenzene 9.6E-1 1.8E-10 <br /> Toluene 9.6E-1 1.7E-10 <br /> Xylene (mixed isomers) 9.6E-1 3.2E-10 <br /> TPH-Aliph>C16-C21 9.6E-1 3.4E-4 <br /> TPH -Aliph >C21-C34 9.6E-1 4.0E-2 <br /> TPH -Arom >C16-C21 9.6E-1 2.2E-9 <br /> TPH -Aram >C21-C35 9.6E-1 9.7E-8 <br /> TPH -Aliph>C12-C16 9.6E-1 3.6E-5 <br /> TPH -Aram >C12-C16 9.6E-1 5.1 E-9 <br /> NOTE: AT=Averaging time(days) EF=Exposure frequency(daystyr) ED=Exposure duration(yr) <br /> Site Name: Heritage Square Date Completed:20-Sep-02 <br /> Site Location:640 N.San Joaquin Street,Stockton,CA Job ID: 3572E <br /> Completed By: Lee H.Morse <br />