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Cox and Cox -2- April 23, 200 <br /> Claim No. 9444 .� <br /> B. Monitoring Well Information <br /> Well Designation Date Installed Screen Interval Most.Recent DTW <br /> feet b s Jan 08 <br /> MW-1- Sep 95 ?-16 9.16 <br /> MW-2 Sep 95 .?-15 9.01 <br /> MW-3R Nov 04 ?-19 9.21 <br /> MW-4 Aug97 ?-14 9.02 <br /> MW-5 Aug97 ?-17 9.10 <br /> MW-6 Aug97 ?-16 9.35 <br /> MW-7 Aug97 ?-13 9.25 <br /> MW-8 Aug97 ?-1.5 8.90 <br /> MW-9R Nov 04 ?-19 9.15 <br /> • MTBE THREAT CLASSIFICATION: X <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 /> (mglkg) '(mg/kg) (Jan 08) <br /> TPH NA NA NA NA 690,000 1,800 5 <br /> TPH-d NA NA NA NA 800 310 49 <br /> Benzene NA NA 0.64 -1.4 1,700 <0.5 0.15 <br /> Toluene NA NA 520 . 520 850 0.67 42 <br /> Eth lbenzene NA NA 400 400 9,800 5 29 <br /> Xylenes NA NA 270 420 34,000 1.2 17 <br /> MTBE NA NA 32 70 <0.5 <5 5 <br /> TBA NA NA NA NA <5 <5 12 <br /> 12-DCA NA NA NA NA <0.5 <0.5 0.5 <br /> Lead NA NA 400 800. NA 66 15 <br /> PCE NA NA 17 130 1 NA NA 0.06 <br /> TCE NA NA 0.11 1 110 NA NA 0.8 <br /> PRGs USEPA Region 9 Preliminary Remediation Goals <br /> MCL Ma)dmum 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 in Feb 04 <br /> CafffornfaEnvhvzrui WPrntectfonAgeary <br />