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Thrifty Oil _ -2- March 16, 2009 <br /> Claim No. 2156 <br /> B. Monitoring Well Information <br /> Well Designation Date Installed Screen Interval Most Recent DTW <br /> (feet b s Nov 08) <br /> MW-3 May 91 45-75 35.53 <br /> MW-4 Jun 91 45-75 36.63 <br /> MW-5 Feb 96 40-60 34.42 <br /> MW-6 Feb 96 40-60 34.05 <br /> MW-7 May 94 26-56 35.72 <br /> MW-9 Feb 96 40-60 34.77 <br /> MW-10 Aug96 38-58 35.47 <br /> MW-11 Aug96 38-58 38.76 <br /> MW-12 May 07 68-75 37.38 <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 WQOs <br /> Maximum Latest Shallow Industna12 Maximum Latest (ug/L) <br /> Soil Dermal (Nov 08) <br /> Residential (mg/kg) <br /> (mg/kg <br /> TPH-g NA NA 83 450 316,000 837 5 <br /> TPH-d NA NA 83 450 NA NA 56 <br /> Benzene NA NA 0.044 0.27 26,500 <5 0.15 <br /> Toluene NA NA 2.9 210 33,900 16 42 <br /> Eth (benzene NA NA 2.3 5.0 6,680 NA 29 <br /> Xylenes NA NA 2.3 100 31,400 14 17 <br /> MTBE NA NA 0.023 65 39.500 251 5 <br /> TBA NA NA 0.075 320,000 13,400 11 12 <br /> 1,2-DCA NA NA 0.0045 0.48 NA NA 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 /> WOO 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 /> California Environments/Protection Agency <br /> .n <br /> %5 Recycled Paper <br />