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West Clay Properties -3- May 2, 2011 <br /> Claim No. 8542 <br /> IV. MAXIMUM DOCUMENTED CONTAMINANT CONCENTRATIONS <br /> Contaminant Soil m /k Water (ug/L WQOs <br /> Maximum Latest Maximum Latest (ug/L) <br /> Dec 2010 <br /> TPH-g NA NA 86,000 14,000 5 <br /> TPH-d NA NA 29,000 1,500 56 <br /> Benzene NA NA 8,300 2,600 0.15 <br /> Toluene NA NA 10,400 58 42 <br /> Eth (benzene NA NA 3,200 230 29 <br /> Xylenes NA NA 4,900 183 17 <br /> MTBE NA NA 590 17 5 <br /> TBANA NA 480 <10 12 <br /> 1,2-DCA I NA NA 110 52 0.5 <br /> NA: Not Analyzed, Not Applicable or Data Not Available <br /> mg/kg: milligrams per kilogram, parts per million <br /> ug/L: micrograms per liter, parts per billion <br /> WQOs 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 /> D. Groundwater Trends: Benzene trends are shown below, down gradient of <br /> source area <br /> BENZENE Results for MW1 <br /> 9000 <br /> &000 <br /> 7000 <br /> --6000 <br /> J <br /> j 5000 <br /> 5 4000 <br /> m <br /> 3000 r <br /> 2000 -- - - -�----. - <br /> 1000 <br /> BENZENE <br /> CaliforniaCalifornia Eniironmental Protection Agenev <br /> Psi Recycled Paper <br />