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Jose Garcia -2- June 19, 2008 <br /> Claim No. 8790 <br /> B. Monitoring Well Information <br /> Well Designation Date Installed Screen Interval Most Recent DTW <br /> feet b s Jan 07 <br /> MW-1 Aug88 ? 45.17 <br /> MW-2 Jun 91 ? 45.76 <br /> MW-3 Jun 91 ? 44.88 <br /> MW-4 Nov 03 ? 44.96 <br /> MW-5 Nov 03 ? 45.31 <br /> MW-6 Nov 03 ? 44.58 <br /> • MTBE THREAT CLASSIFICATION: N <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/kg) Jan 07 <br /> TPH-q NA NA NA NA FP 7,400 5 <br /> TPH-d NA NANA NA FP NA 56 <br /> Benzene NA NA 0.64 1.4 FP 78 0.15 <br /> Toluene NA NA 520 520 FP 580 40 <br /> Eth (benzene NA NA 400 400 FP 83 29 <br /> Xylenes NA NA 270 420 FP 830 17 <br /> MTBE NA NA 32 70 FP 2 5 <br /> TBA NA NA NA NA FP <5 12 <br /> 1,2 DCA NA NA NA NA FP 9.2 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, Applicable,or Data Not Available <br /> Woo Water Quality Objectives <br /> FP Free product <br /> V. FREE PRODUCT: free product has been identified in MW-1 up to 0.52 feet (Jun 91), <br /> free product has been identified in MW-2 up to 0.62 feet (Jun 91), and free product has <br /> been identified in MW-3 up to 0.68 feet (Jun 91), <br /> VI. SOIL AND GROUNDWATER REMEDIATION <br /> A. Soil Excavation: unknown volume excavated in Apr 00. <br /> California Euvironmenta/Protection Agency <br /> P.a Recyc/edPaper <br />