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Three Palms Grocery -2- May 9, 2008 <br /> Claim No. 13455 <br /> B. Monitoring Well Information <br /> Well Designation Date Installed Screen Interval Most Recent DTW <br /> (feet bgs) (Oct 07) <br /> MW-1 Jun 99 71-91 - <br /> MW-2 Jun 99 71-91 - <br /> MW-3 Jun 99 72-92 - <br /> MW-4 Oct 05 130-140 94.94 <br /> MW-5 Oct 05 130-140 94.65 <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) (Oct 07) <br /> TPH-g NA NA NA NA 210 <50 5 <br /> TPH-d NA NA_ NA NA NA NA 49 <br /> Benzene NA NA 0.64 1.4 1.2 <0.5 0.15 <br /> .Toluene NA NA 520 520 0.8 <0.5 42 <br /> Eth (benzene NA NA 400 400 1.4 <0.5 29 <br /> Xylenes NA NA 270 420 7.8 <0.5 17 <br /> MTBE NA NA 32 70 <5 <0.5 5 <br /> TBA NA NA NA NA <20 <5 12 <br /> 1,2-DCA NA NA NA NA 40 <0.5 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 /> B. In-Situ Soil Remediation: <br /> • METHOD: soil vapor extraction pilot test was conducted in Sep 07 <br /> C. Groundwater Remediation: none identified <br /> Califorl,rra En vironmenlalProleclion Agency <br /> .fl <br /> �,a llecyc%d Paper <br />