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DIK Enterprises Inc. -4- May 9, 2008 <br /> Claim No. 12992 <br /> IV. MAXIMUM DOCUMENTED CONTAMINANT CONCENTRATIONS <br /> Contaminant Soil m k PRGs Water (ug/L WQOs <br /> Maximum Latest Residential IndustrialE120,000 <br /> Latest (ug/L) <br /> m /k m /kOct 07 <br /> TPH- NA NA NA NA 19,000 5 <br /> TPH-d NA NA NA NA 1,300 49 <br /> Benzene NA NA 0.64 1.4 2,300 0.15 <br /> Toluene NA NA 520 520 46 42 <br /> Eth benzene NA NA 400 400 50 29 <br /> X lenes NA NA 270 420 , 1 85 17 <br /> MTBE NA NA 32 70 150 <1 5 <br /> TBA NA NA NA NA 190 <10 12 <br /> 1,2-DCA NA NA NA NA 970 75 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 /> WOO 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 Remediation: <br /> • METHOD: soil vapor extraction is pending <br /> C. Groundwater Remediation: <br /> METHOD: air sparging is pending <br /> California En vironm ental Protection A,-en cy <br /> �,�J'Reryc%dPnper <br />