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Thrifty Oil -2- _. April 21 , 2D08 <br /> Claim No. 2156 <br /> B. Monitoring Well Information <br /> Well Designation Date Installed Screen Interval Most Recent DTW <br /> _ (feet b s) (Aug07 <br /> MW-3 May 91 45-75 36.61 <br /> MW-4 Jun 91 45-75 37.61 <br /> MW-5 Feb 96 40-60 35.42 <br /> MW-6 Feb 96 40-60 35.43 <br /> MW-7 May 94 26-56 36.72 <br /> MW-9 Feb 96 40-60 38.11 <br /> MW-10 Aug 96 38-58 36.46 <br /> MW-11 Aug96 38-58 37.22 <br /> MW-12 May 07 68-75 31.32 <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 _ PRGs Water (ug/L WQOs <br /> Maximum Latest Residential Industrial Maximum Latest (ug/L) <br /> (mg/kg) (mg/k Nov 07 <br /> TPH-9 NA NA NA NA 316,000 11,100 5 <br /> TPH-d NA NA NA NA NA NA 49 <br /> Benzene NA NA 0.64 1.4 26,500 3,760 0.15 <br /> Toluene NA NA 520 520 33,900 7.4 42 <br /> Eth (benzene NA NA 400 400 6,680 NA 29 <br /> Xylenes NA NA 270 420 31,400 628 17 <br /> MTBE NA NA 32 70 39,500 305 5 <br /> TBA NA NA NA NA 13,400 155 12 <br /> 1,2-DCA NA NA NA NA NA NA 0.5 <br /> Lead NA NA 400 800 NA NA 15 <br /> PCE NA NA 17 130 NA NA 0.06 <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 /> C.v1Vorn1a Environmental Protection Agency <br /> 0m1 Recycled Paper <br />