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l [ [ t [ f [ [ [ [ [ t t C t l l t <br /> Tier 1 Worksheet 6.3 <br /> IRBCA SITE ASSESSMENT <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&B) 1.0E-5 ❑ MCL exposure limit? Calculation Option: i <br /> GROUNDWATER RBSL VALUES Target Risk(Class C) 1.0E-5 ❑ PEL exposure limit? <br /> Target Hazard quotient 1.0E+0 <br /> RBSL Results For Complete Exposure Pathways("x"If Complete) <br /> Representative <br /> Concentration Groundwater Volatilization Groundwater Volatilization Applicable RBSL <br /> CONSTITUENTS OF CONCERN XT Groundwater Ingestion X to Indoor Air X to Outdoor Air RBSL Exceeded? Required CRF <br /> Residential: Commercial: Regulatory(MCL): Residential: Commercial: Resdentlal Commercial: <br /> CAS No. Name (mg/L) (on-site) (on-site) (on-site) (on-site) (on-site <br /> (on_) site) (on-site) (mg/L "■"If yes Only dyes'left <br /> 71-43-2 Benzene 4.1E-2 NA 2.9E-2 NA NA 2.0E+0 NA >Sol 2.9E-2 ■ 1.0E+00 <br /> 100-41-4 Eth (benzene 3.2E-3 NA 1.0E+1 NA NA >Sol NA >Sol 1.0E+1 ❑ I <1 <br /> 1634-044 Meth t-Butyt Ether 5.2E-2 NA 5.1 E-1 NA NA 4.7E+3 NA >Sol 5.1 E-1 ❑ <1 <br /> 108-88-3 Toluene 1.5E-2 NA 2.0E+1 NA NA I >Sol NA >Sol 2.0E+1 ❑ <1 <br /> 1330-20-7 Xylene mixed isomers 6.4E-2 NA >Sol NA NA >Sol NA >Sol >Sol ❑ <1 <br /> >Sol indicates risk-based target concentration greater than constituent solubility <br /> Software: GSI RBCA Spreadsheet Serial: G-313-VKX-542 <br /> C Groundwater Services,Inc.(GSI),1995-1997.All Rights Reserved. Version: 1.0.1 <br />