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TEer 2 Worksheet 9.3 <br /> RBCA SITE ASSESSMENT <br /> Site Name:Former Regal 603 Completed By:Roy Butter <br /> Site Location:6425 Pacific Aenue,Slockton,CA Date Com leled:7/10/1998 1 OF 1 <br /> Target Risk(Class A 8 D)1.OE-6 ❑ MCL exposure limit? Calculation Option: 2 <br /> GROUNDWATER SSTL VALUES Target Risk(Class C)1.0E-5 ❑ PEL exposure limit? Groundwater DAF Option Elec Acceptor Super. <br /> Target Hazard Quotient 1.0E+0 (One-directional vert.dispersion) <br /> SSTL Results For Complete Exposure pathways("x"it Complete) <br /> Representative SSTL <br /> Concentration Groundwater Volatilization Groundwater Volatilization Applicable Exceeded <br /> CONSTITUENTS OF CONCERN X Groundwater Ingestion to Indoor Air X to Outdoor Air SSTL ? RequiredCRF <br /> Residential: Commercial: Regulatory(MCL): Residenliat Commercial: Residential Commercial: <br /> CAS No. Name (M-910 3000 feet (on-site) (on-site) (on-sita) (on-site) (on-site) (on-site) (mglL "S"If es On K' es'left <br /> 71-43-2 Benzene 4.4E-2 1.2E+0 9.9E-3 NA NA NA NA 1.2E+2 9.9E-3 ■ 4.0E+00 <br /> 100-41-4 Eth (benzene 3.1 E-1 5.8E+1 1.0E+1 NA NA NA NA >Sol 1.0E+1 ❑ <1 <br /> 110-54-3 Hexane,n- 1.0E+1 >Sol 6.1 E+0 NA NA NA NA >Sol 6.1 E+0 ■ 2.0E+00 <br /> 1634-04-4 Methyl t-But l Ether 8.1 E-2 4.6E+0 5.1 E-1 NA NA NA I NA >Sol 5.1 E-1 ❑ <1 <br /> 108-88-3 Toluene 4,9E-1 1.1E+2 2.0E+1 NA NA NA NA >Sol 2.0E+1 ❑ <1 <br /> 1330-20-7 Xylene mixed isomers 2.2E+0 I >Sol >Sol NA NA NA NA >Sol >Sol ❑ <1 <br /> >Sol indicates risk-based target concentration greater than constituent solubility <br /> Software: GSI RSCA Spreadsheet Serial: G-443-CSX-444 <br /> ©Groundwater Services,Inc.(GSI),1995-1997.All Rights Reserved. Version: 1.0.1 <br />