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REICA SITE ASSESSMENT <br /> Tier 2 Worksheet 9.3 <br /> Site Name:McDowell and Davis Towing,1360 Escalon Ave Completed By:Robed Fourt,CEG 1 CHG <br /> Site Location:Escalon,San Joaquin County,CA Date Completed:12!3!2002 1 OF 1 <br /> Target Risk{Class A 8 B) 1.0E-6 2 MGL exposure limit? Calculation Option:3 <br /> GROUNDWATER SSTL VALUES Target Risk(Class C)1.0E,5 ■ PEL exposure limit? Groundwater DAF Option: Domenico-First Order <br /> Target Hazard Quotient 1.0E-0 f7w"irectional vert.dispersion) <br /> SST(.Results For Complete Exposure Pathways("i"if Complete) <br /> Representative SSTL <br /> Concentration Groundwater Volatilization Groundwater Volatilization Applicable i Exceeded <br /> CONSTITUENTS OF CONCERN X Groundwater Ingestion X to Indoor Air X I to Outdoor Air SSTL ? Required CRF <br /> Residential: Commercial: Regulalory(MCL): Residential: Commercial: Residential Commercial: <br /> CAS No. Name (mglL) (on-site) 750 feet 750 feet (on-site) (on-site)(PEL) (on-site) (on-site)(PEL) (mgft. "N"If yes Only if'yes'(eft <br /> 71-43-2 Benzene 4.6E-3 NA 8.5E+0 4.3E+0 NA >Sol NA >Sol 4.3E+0 ❑ <1 <br /> 100-41-4 Eth (benzene 4.0E-3 NA >Sol >Sol NA >Sol NA >Sol >Sol ❑ 1 <1 <br /> 1634-0411 Meth t-Butyll Ether 1.0E-4 NA 6.4E+2 NA NA >Sol NA >Sol 6.4E+2 ❑ <1 <br /> 108-B8-3 lToluene 9.5E-3 I NA >Sol >Sol NA >Sol NA >Sol >Sol ❑ <1 <br /> 1330-20-7 IMene (nixed isomers 8.8E-3 NA >Sol >Sol NA >Sol NA >Sol >Sol ❑ <1 <br /> >Sol indicates risk-based target concentration greater than constituent solubility <br /> Software: GSI RSCA Spreadsheet Serial: G-491-EFX-872 <br /> ®Groundwater Services,Inc.(GSI),1995-1997.All Rights Reserved. Version: 1.0.1 <br />' 0, <br /> i <br /> Y <br />