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i <br /> Den's Auto Repair -2- April 21, 2008 <br /> Claim No. 10841 <br /> B. Monitoring Well Information <br /> Well Designation Date Installed Screen Interval Most Recent DTW <br /> feet b s Nov 07 <br /> MW-1a Sep 97 60-65 24.44 <br /> MW-1b Sep 97 25-45 24.39 <br /> MW-2a Sep 97 60-65 24.89 <br /> MW-2b Sep 97 25-45 24.60 <br /> MW-3a Sep 97 60-65 25.75 <br /> MW-3b Sep 97 20-40 25.71 <br /> MW-4 Feb 06 110-120 24.98 <br /> MW-5 Feb 06 60-65 24.55 <br /> MW-6 Feb 06 60-65 25.33 <br /> MW-7 Feb 06 110-120 24.92 <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 PRGs Water (ug/L WQOs <br /> Maximum . Latest Residential Industrial Maximum Latest (ug/L) <br /> (mg/kg) m /k Nov 07 <br /> TPH-g NA NA NA NA 30,000 24,000 5 <br /> TPH-d NA NA NA NA NA NA 49 <br /> Benzene NA NA 0.64 1.4 8,400 1,400 0.15 <br /> Toluene NA NA 520 520 200 .41 42 <br /> Eth (benzene NA NA 400 400 1,000 170 29 <br /> Xylenes NA NA 270 420 1,500 140 17 <br /> MTBE NA NA 32 70 2,160 NA 5 <br /> TBA NA NA NA NA 650 NA 12 <br /> 1,2-DCA NA NA NA NA 31 26 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 /> WOO 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/ Groundwater Remediation: none identified <br /> California Environmental Protection Agency <br /> P.d Recyc%d Ape.- <br />