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[ ! t t t t t [ t [ f t t [ f t t t <br /> RIBCA SITE ASSESSMENT Tler 2 Worksheet 9.2 <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:2 <br /> SUBSURFACE SOIL SSTL VALUES Target Risk(Class C)1.0E-5 ❑ PEL exposure limit? Groundwater DAF Option: Domenico-First Order <br /> > 15 FT BGS Target Hazard Quotient 1.0E+0 (One-directional vert dispersion) <br /> SSTL Reoutts For Com lets Exposure Pathways('X'If Com late) <br /> Representstlw <br /> Concentration Soil Volatilization to Soil Volatilization to Applicable SSTL <br /> CON3TITUENT3 OF CONCERN X Soil Leaching to Groundwater X Indoor Air X Outdoor Air SSTL Exceeded? Required CRF <br /> Residential- Commercial: Regulatory(MCL): Residential: Commercial: Residential: Commercial: <br /> CA3 No. Name (mg/kg) 100 feet (on-sle) (on site <br /> (oo-slte) (on-site) 100 feet (on-stte) (mglkg) If yes Only rf'yes'left <br /> 71-43-2 Benzene 8.5E-3 >Res 5.2E-1 NA NA 1.3E-1 3.2E+2 4.5E+2 1.3E-1 ❑ <1 <br /> 100-41-4 Ethylbenzerve 1.4E-1 >Res >Res NA NA 1.3E+2 >Res >Res 1.3E+2 ❑ <1 <br /> 1634-044 Meth t-Butyi Ether 2.9E-2 >Res 3.7E+0 NA NA 4.3E+2 >Res >Res 3.7E+0 ❑ <1 <br /> 108-88-3 1 Toluene 1.2E-1 >Res >Res NA NA 5.1E+1 >Res >Res 5.1E+1 ❑ <1 <br /> 1330 20 7 X ene mixed isomers 3.0E-1 >Res >Res NA NA >Res >Res >Rd;s >Res ❑ <1 <br /> >Res indicates risk-based target concentration greater than constituent residual saturation value <br /> Software:GSI RBCA Spreadsheet Serial:G-313-VKX-542 <br /> 0 Groundwater Services,Inc.(GSI),1995-1997.All Rights Reserved. Version: 1.0.1 <br />