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Best California Gas -2- May 9,.2008 <br /> Claim No. 13.729 <br /> B. Monitoring Well Information <br /> Well Designation Date Installed Screen Interval Most Recent DTW <br /> feet b s Dec 07 <br /> MW-2 Feb 99 30-60 42.71 <br /> MW-3r Nov 92 40-70 42.37 <br /> MW-4 Nov 92 70-90 43.69 <br /> MW-6 Nov 92 65-90 43.57 <br /> TB-1 Jun 95 40-70 41.92 <br /> TB-7 Jun 95 25-75 42.38 <br /> TB-8 Jun 95 45-75 43.61 <br /> TBA 0 Jun 95 20-70 41.63 <br /> EW-5s May 05 40-60 41.86 <br /> EW-5d Ma 05 65-85 41.92 <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 /> 1V. 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) Dec 07 <br /> TPH NA NA NA NA 166,000 4,200 5 <br /> TPH-d NA NA NA NA NA NA 49 <br /> Benzene NA NA 0.64 1.4 18,200 1 90 0.15 <br /> Toluene NA NA 520 520 39,700 12 42 <br /> Eth lbenzene NA NA 400 400 4,400 X50 29 <br /> Xylenes NA I NA 270 420 24,600 357 17 <br /> MTBE NA NA 32 70 40,400 2,600 5 <br /> TBA NA NA NA NA 28,000 1,060 12 <br /> 112-DCA NA NA NA NA 3.8 ND 0.5 <br /> Lead NA NA 400 1 800 NA NA 15 <br /> PCE NA NA 17 130 NA NA 0.06 <br /> TCE NA NA 0.11L 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 /> Calzforrria�'nvzronmen�alProteclronAgency <br /> .n <br /> P.,r�Recycled Paper ' <br />