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Stephen L. Valentine -3- February 10, 2009 <br /> Claim No. 417 <br /> IV. MAXIMUM DOCUMENTED CONTAMINANT CONCENTRATIONS <br /> Contaminant Soil m /k ESLs Water (ug/L WQOs <br /> Maximum Latest Shallow Industrial 2 Maximum Latest (ug/L) <br /> Soil' (Jul 08) <br /> Residential Dermal <br /> m /k (mg/kg) <br /> TPH-g NA NA 83 450 260,000 130,000 5 <br /> TRH-d NA NA 83 450 NA NA 49 <br /> Benzene NA NA 0.044 . 0.27 27,000 8,900 0.15 <br /> Toluene NA NA 2.9 210 34,000 17,000 42 <br /> Eth (benzene NA NA 2.3 5.0 8,250 880 29 <br /> Xylenes NA NA 2.3 100 19,000 3,700 17 <br /> MTBE NA NA 0.023 65 340 1.7 5 <br /> TBA NA NA 0.075 320,000 210 25 12 <br /> 1,2-DCA NA NA 0.0045 0.48 78 30 0.5 <br /> Lead NA NA 200 750 NA NA 15 <br /> PCE NA NA 0.37 0.95 - NA NA 0.06 <br /> TCE NA NA 0.46 4.1 1 NA NA 0.8 <br /> 1 Environmental Screening Levels(ESLs)Shallow Soil<3m,Groundwater is source of Drinking Water. <br /> 2 ESLs, Shallow Soil Screening Levels,Groundwater not source of Drinking Water,Commercial Use, Direct Exposure, <br /> Worker <br /> NA Not Analyzed, Not Applicable,or Data Not Available <br /> WQO Water Quality Objectives <br /> FP Free phase product in site wells <br /> V. FREE PRODUCT: none identified <br /> VI. SOIL AND GROUNDWATER REMEDIATION <br /> A. Soil Excavation-.' unknown volume <br /> B. In-Situ Soil/ Groundwater Remediation: <br /> • METHOD: dual phase extraction <br /> DURATION: Apr 07 through present <br /> • MASS REMOVED VAPOR PHASE: 4,250 pounds of TPH-G (Sep 08) <br /> RATE OF TPH-G REMOVAL: 8.4 pounds/day <br /> I <br /> } <br /> California Environmental Protection Agency <br /> �.r�Recycled Pape, <br />