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0 <br /> Tier 2 Worksheet 9 3 <br /> RBCA SITE ASSESSMENT <br /> Site Name Formeer Regal 603 Completed By George Converse <br /> Slle Location 6425 Pacific Aenue Stockton CA Date Completed 1011511998 1 OF f <br /> Target Risk{Class A 8 B) 1 OE 6 ❑ MCL exposure limit? Calculation Option 2 <br /> GROUNDWATER SSTL VALUES Target Risk(Class C) 1 OE 5 ❑ PEL exposure limit» Groundwater DAF Option Elec Acceptor Super <br /> Target Hazard Quotient 1 OE+0 (One directional verl disperswn) <br /> SSTL Results For Complete Exposure Pathways("x"if Complete} <br /> Representative SSTL <br /> Cancentratton Groundwater Volatilization Groundwater Volatilization Applicable Exceeded <br /> CONSTITUENTS OF CONCERN X Groundwater Ingestion I to Indoor Air X to Outdoor Air SSTL 7 Required CRF <br /> Residential Commercial Regulatory(MCL) Residential Commercial Residential Commercial <br /> CAS No Name (rng1L) 3000 feet (on s4e) {on site) (on-site) (on-silo) (on site) (on site) (mgrL "■"If yes Only i! yes left <br /> 71-43-2 Benzene 5 OE-3 4 6E-1 9 9E-3 NA NA NA NA 1 2E+2 9 9E-3 ❑ <1 <br /> 100-414 Eth (benzene Z 2E-1 6 9E+1 1 0E+1 NA NA NA NA >Sol 1 0E+1 ❑ c1 <br /> 110-54-3 Hexane,n- 3 4E+0 >Sol 6 1 E+0 NA NA NA NA >Sol 6 1 E+O ❑ <1 <br /> 1634-04-4 1 Methyl t-Bu I Ether 2 9E-2 5 OE+0 5 1E-1 NA NA NA NA >Sol 5 1E-1 ❑ <1 <br /> 108-88-3 1 Toluene 5 8E-2 1 0E+2 2 0E+1 NA NA NA NA >Sol 2 0E+1 ❑ <1 <br /> 1330-20-7 X lene(rnixed isomers 4 9E-1 >Sol >Sol NA NA NA NA >Sol >Sol ❑ <1 <br /> >Sol indicates risk based target concentration greater than constituent solubility <br /> Software GS]RBCA Spreadsheet Serial G443•CSX-444 <br /> ®Groundwater Services Inc (GSI) 19951997 All Rights Reserved Version 10 1 <br /> I � <br /> I i <br /> t <br />