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Arthur Wyatt 4.� -3- v April 27, 2009 <br /> Claim No. 1088 <br /> IV. MAXIMUM DOCUMENTED CONTAMINANT CONCENTRATIONS <br /> Contaminant Soil m lk ESLs Water (ug/L WQOS <br /> Maximum Latest Shallow Industrial Maximum Latest (ug/L) <br /> Soil (Nov 08) <br /> Residential Dermal <br /> (mg/k (mg/kg) <br /> TPH-g NA NA 83 450 270,000 720 5 <br /> TPH-d NA NA 83 450 48,000 NA 56 <br /> Benzene NA NA 0.044 0.27 25,000 <0.5 0.15 <br /> Toluene NA NA 2.9 210 44,000 <0.5 42 <br /> Eth (benzene NA NA 2.3 5.0 4,400 12 29 <br /> Xylenes NA NA 2.3 100 27,000 20.1 17 <br /> MTBE NA NA 0.023 65 5,900 26 5 <br /> TBA NA NA 0.075 320,000 300 <10 12 <br /> 1,2-DCA NA NA 0.0045 0.48 1.5 <0.5 0.5 <br /> Lead NA NA 200 750 NA NA 15 <br /> PCE NA NA 0.37 0.95 NA NA 0.06 <br /> TCE NA NA 0.46 4.1 NA NA 0.8 <br /> 1 Environmental Screening Levels(ESLs)Shallow Soil<3m,Groundwater is source of Drinking Water. <br /> 2 ESLs,Shallow Soil Screening Levels,Groundwater not source of Drinking Water,Commercial Use, Direct Exposure, <br /> Worker <br /> NA Not Analyzed, Not Applicable,or Data Not Available <br /> WQO Water Quality Objectives <br /> FP Free phase product in site wells <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 /> �1 <br /> • DURATION: Jan 05 through present, discontinued <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 <br /> • MASS OF TPH-G REMOVED: 73 pounds <br /> California En wronmental Protection Agency <br /> 0 Recycled Paper <br />