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West Clay Properties -3- May 28, 2008 <br /> Claim No. 8542 <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) Se 07 <br /> f P H--g NA NA NA NA 86,000 14,000 5 <br /> TPH-d NA NA NA NA 29,000 3,600 49 <br /> Benzene NA NA 0.64 1.4 8,300 4,200 0.15 <br /> Toluene NA NA 520 520 10,400 130 42 <br /> Eth (benzene NA NA 400 400 3,200 1,200 29 <br /> Xylenes NA NA 270 420 4,900 1,840 17 <br /> MTBE NA NA 32 70 590 <1 5 <br /> TBA NA NA NA NA 480 <10 12 <br /> 1,2-DCA NA NA NA NA 110 13 0.5 <br /> Lead NA I 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: approximately 550 cubic yards were excavated in Oct 93 and <br /> 340 cubic yards were excavated in Dec 03. <br /> B. In-Situ Soil Remediation: none identified <br /> C. Groundwater Remediation: <br /> • METHOD: ozone sparging <br /> • DURATION: Nov 07 through present <br /> California En vironmeatai Protection Agency <br /> ZJ' Recycled Paper <br />