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Liagot Khan -2- May 4, 2009 + <br /> Claim No. 14872 <br /> B. Monitoring Well Information <br /> Well Designation Date Installed Screen Interval Most Recent DTW <br /> (feet b s) (Feb 09) <br /> MW-1 May 00 5-20 7.87 <br /> MW-2 May 00 5-20 7.79 <br /> MW-3 May 00 5-20 8.04 <br /> MW-4 Oct 00 5-20 7.71 <br /> MW-5 Jul 03 50-55 5.72 <br /> • MTBE THREAT CLASSIFICATION: C <br /> • LAND USE DESIGNATION: residential and commercial <br /> • ESTIMATED WATER QUALITY OBJECTIVES (WQO'S) FOR SITE: Per the <br /> Water Quality Control Plan (Basin Plan) for the Sacramento River Basin and the <br /> San Joaquin River Basin (Fourth Edition). <br /> IV. MAXIMUM DOCUMENTED CONTAMINANT CONCENTRATIONS <br /> Contaminant Soil m /k ESLs Water (ug/L WOOs <br /> Maximum Latest Shallow Industrial Maximum Latest (ug/L) <br /> Soil (Feb 09) <br /> Dermal <br /> Residential(mg/kg) (mg/kg) <br /> TPH-g NA NA 83 450 8,700 1,000 5 <br /> TPH-d NA NA 83 450 NA NA 56 <br /> Benzene NA NA 0.044 0.27 1,900 18 0.15 <br /> Toluene NA NA 2.9 210 290 <0.5 42 <br /> Eth (benzene NA NA 2.3 5.0 430 3.5 29 <br /> Xylenes NA NA 2.3 100 940 5.4 17 <br /> MTBE NA NA 0.023 65 3,000 87 5 <br /> TBA NA NA 0.075 320,000 350 NA 12 <br /> 1,2-DCA NA NA 0.0045 0.48 5 <0.5 0.4 <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: none identified <br /> C. Groundwater Remediation: <br /> • METHOD: groundwater extraction <br /> California En rironmental Protection Agency <br /> ;cv Receded Paper <br />