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Arthur Wyatt -3- May 23, 2008 i <br /> ` Claim No. 1088 <br /> IV. MAXIMUM DOCUMENTED CONTAMINANT CONCENTRATIONS <br /> Contaminant Soil m /kg) PRGs Water (ug/L WQOs <br /> Maximum Latest Residential industrial Maximum Latest (ug/L) <br /> 4. m /k (mg/kg) Dec 07 <br /> TPH-9 NA NA NA NA 270,000 600 5. <br /> TPH-d ' NA NA NA NA 48,000 <50 49 <br /> Benzene NA NA 0.64 1.4.. 25,000 4.5 0.15 <br /> Toluene NA NA -520 520 44,000 7.1 42 <br /> Eth (benzene NA NA 400 400 41400 0.7 . 29 <br /> Xylenes NA NA 270 420 27,000 31 17 <br /> MTBE NA NA 32 70 5,900 - .260 5 <br /> TBA NA NA NA NA, _- 300 <10 12 <br /> 1,2-DCA NA NA NA NA 1.5 <0.5 0.5 <br /> Lead NA NA 400 800 NA NA 15 <br /> PCE NA NA 17 130 NA NA 0.06. i <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 Remediation: <br /> • METHOD: soil vapor extraction <br /> • DURATION: Jan 05through present <br /> • MASS REMOVED: 5786 pounds of TPH-G <br /> INFLUENT CONCENTRATION MAR 07: <50 ppm <br /> C. Groundwater Remediation: <br /> • METHOD: groundwater extraction <br /> • DURATION: Oct 01 through Mar 05 . <br /> •. .VOLUME OF.GROUNDWATER EXTRACTED: 2.7 million gallons, <br /> • MASS OF MTBE REMOVED: 10.5 pounds i <br /> • MASS OF TPH-G REMOVED: 73 pounds , <br /> I <br /> i California En vironmental Protection Agency <br /> $,a Recycled Paper <br /> F, <br />