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Equilon Enterprises -2- March 19, 2008 <br /> Claim No. 4954 <br /> B. Monitoring Well Information <br /> Well Designation Date Installed Screen Interval Most Recent DTW <br /> feet b s Nov 07 <br /> MW-1 Dec 89 ?-40 18.02 <br /> MW-10 Aug91 ? 18.78 <br /> MW-2 Dec 89 ?-40 18.68 <br /> MW-3 Dec 89 ?-39 18.97 <br /> MW-4 Dec 89 ?-40 18.02 <br /> MW-5 Jan 90 ?- 19.15 <br /> MW-6 Jan 90 ?-40 19.20 <br /> MW-7 Jan 90 ?-40 18.30 <br /> MW-8 Mar 90 ?-39 18.60 <br /> MW-9 Mar 90 ?-45 17.80 <br /> MW-16-50 Jul 07 ?-50 19.64 <br /> MW-16-77 Jul 07 ?-77 20.02 <br /> MW-16-90 Jul 07 ?-98 20.00 <br /> MW-17-50 Jul 07 ?-52 23.12 <br /> • MTBE THREAT CLASSIFICATION: B <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) Nov 07 <br /> TPH NA NA NA NA FP 33,000 5 <br /> TPH-d NA NA NA NA FP NA 49 <br /> Benzere NA NA 0.64 1.4 FP 1,300 0.15 <br /> Toluene NA NA 520 520 FP 1,800 42 <br /> Eth lbenzene NA NA 400 400 FP 490 29 <br /> Xylenes NA NA 270 420 FP 180 17 <br /> MTBE NA NA 32 70 FP 130 5 <br /> TBA NA NA NA NA FP 72 12 <br /> 1,2-DCA NA NA NA NA FP 6.7 0.5 <br /> Lead NA NA 400 800 FP 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 /> California En vironmental Protection Agency <br /> Za Recycled Paper <br />