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�'� ��""� [r"`"'�; �"""I.i 1'"'�t; [�; !'� �""�,• Com: �� C"'-f �; �'"",�. C""�'. � C�i. <br /> s <br /> Tier 2 Worksheet 9.2 <br /> Site Name:McDowell and Davis Towing,1360 Escalon Ave Completed By:Robert Fourt,CEG 1 CHG <br /> Site Location:Escalon,San Joaquin County,CA Date Completed:11/1512003 1 OF i <br /> Target Risk(Class A 8 B) 1.0E-6 ■ MCL exposure limit? Calculation Option:3 <br /> SUBSURFACE SOIL SSTL VALUES Target Risk(Class C)1 9E-5 ■ PEL exposure I�mit? Groundwater DAF Option: Domenico-First Order <br /> (> 0 FT BGS) Target Hazard Quotient 1 AE+O (Two-directional vert.dispersion) <br /> SSTL Results For Complete Exposure Pathways("x"if Complete) <br /> Representative { SSTL <br /> Concentration Soil Volatilization to Soil Volatilization t0 Applicable Exceeded 3 <br /> CONSTITUENTS OF CONCERN X Soil Leaching to Groundwater X' Indoor Air X Outdoor Air SSTL ? Required CRF ) <br /> 9 <br /> Residential: =_<earn % I; t ;r31 !t'__J R �grrRm.7-- F :sr-lkni mw_z?t <br /> CAS No. Name (mg/kg) (on-site) 750 feet 750 feet (on-site) (on-site)(PEL) 250 feet (on-site)(PEL) (mg/kg) "■"If yes Only it"yes"left <br /> 71-43-2 Benzene 4.4E-3 NA >Res >Res NA >Res 9.6E+1 >Res 9.6E+1 ❑ <1 <br /> 100-41-4 Ethylbenzene 2.6E-1 NA >Res >Res NA >Res >Res >Res I >Res ❑ <1 <br /> 1634-04-4 Methyl t-Butyl Ether 4.5E-1 NA >Res NA NA >Res >Res >ResIf> <br /> Res El <1 <br /> 108-88-3 Toluene 6AE-1 NA >Res >Res NA >Res >Res >Res Res ❑ <1 <br /> 1330-20-7 X leve(mixed isomers) 2.1 E+0 NA >Res >Res NA >Res >Res >Res >Res El <1 a <br /> >Res indicates risk-based target concentration greater than constituent residual saturation value <br /> Software: GSI RBCA Spreadsheet Serial: G-491-EFX-872 <br /> ®Groundwater Services,Inc.(GSI),1995-1997.All Rights Reserved. Version: 1.0.1 <br />