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r r t r r r r r r r r r r r r r r r <br /> ' l <br /> RBCA SITE ASSESSMENT <br /> Tier 1 Worksheet 6.2 <br /> Site Name:Stockton Fire Station#3 Completed By:JEANNE HOMSEY <br /> Site Location:1116 First Street,Stockton,CA Date Completed:3/14/2000 1 OF 1 <br /> Target Risk(Class A a B) 1.0E-5 ❑ MCL exposure limit? Calculation option: 1 <br /> SUBSURFACE SOIL RBSL VALUES Target Risk(Class C) 1.0E-5 ❑ PELexposure limit? <br /> > 15 FT BGS Target Hazard Quotient 1.0E+0 <br /> RBSL Results For Complete Exposure Pathways IN"If Complete) <br /> Representative <br /> Concentration Soil Volatilization to Soil Volatilization to Applicable RBSL <br /> CONSTITUENTS OF CONCERN TSoil Leaching to Groundwater X Indoor Air X Outdoor Air RBSL Exceeded 7 Required CRF <br /> Residential: Commercial: Regulatory(MCL): Residential: Commercial: Residential: Commercial: <br /> CAS No. Name (mg/kg) (on-alts) (on-site) (on-site) (on-site) (on-site on-sKe <br /> ( ) (onalte) (mg/kg) "N"If yes Only If'yes'left <br /> 71-43-2 Benzene 8.5E-3 NA 5.2E-1 NA NA 1.3E-1 NA 4.5E+2 1.3E-1 ❑ <1 <br /> 100-41-4 Elthylbenzene 1.4E-1 NA >Res NA NA 1.3E+2 NA >Res 1.3E+2 ❑ <1 <br /> 1634-04-4 Meth t-Butyi Ether 2.9E-2 NA 3.7E+0 NA NA 4.3E+2 NA >Res 3.7E+0 ❑ <1 <br /> 108-88-3 1 Toluene I 1.2E-1 NA >Res I NA NA 5.1 E+1 I NA I >Res 5.1 E+1 ❑ <1 <br /> 1330-20-7 X iene mixed isomers 3.0E-1 NA >Res I NA NA >Res I NA I >Res .>Res ❑ <1 <br /> >Res indicates risk-based target concentration greater than constituent residual saturation value <br /> Software: GSI RBCA Spreadsheet Serial: G-313-VI(X-542 <br /> m Groundwater Services,Inc.(GSI),1995-1997.All Rights Reserved. Version: 1.0.1 <br />