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Stephen L. Valentine -3- March 14, 2008. <br /> Claim No. 417 <br /> IV. MAXIMUM DOCUMENTED CONTAMINANT CONCENTRATIONS <br /> Contaminant Soil m /k PRGs Water (ug/L WQOs <br /> Maximum Latest Residential Industrial . Maximum Latest (ug/L) <br /> ---(mg/kg) (mg/kg) Oct 07 <br /> TPH-g NA NA NA NA 260,000 150,000 5 <br /> TPH-d NA NA NA NA NA NA 49 <br /> Benzene NA NA 0.64 1.4 27,000 7,000 0.15 <br /> Toluene NA NA 520 520 34,000 15,000 42 <br /> Eth (benzene NA NA 400 400 8,250 1,800 29 <br /> i <br /> Xylenes NA NA 270 420 19,000 11,000 17 <br /> MTBE NA NA 32 70 340 ND .5 <br /> TBA NA NA NA NA 210 <5 12 <br /> 1,2-DCA NA NA NA NA 78 28 0.5 <br /> Lead NA NA 400 800 NA NA 15 <br /> PCE NA NA 17 130 NA NA 0.06 <br /> TCE . . .NA . NA 0:11 110 NA NA, 0.8. <br /> PRGs USEPA Region 9 Preliminary Remediation.Goals. <br /> MCL Maximum Contaminant Levels <br /> AL Action Level <br /> NA Not Analyzed, Not Applicable;or Data Not Available <br /> WQO Water Quality Objectives <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: 485 pounds of TPH-G <br /> -California Environmental Protection-Agency <br /> P.a Recycled Paper , <br /> 4 <br />