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Exxon Mobil Corp. -2- June 24, 2008 <br /> Claim No. 5312 <br /> B. Monitoring Well Information <br /> Well Designation Date Installed Screen Interval Most Recent DTW <br /> feet b s Dec 07 <br /> IW-1 Jan 91 27-47 17.51 <br /> MW-1 Jan 87 11-30 16.85 <br /> MW-2 Jan 87 10-30 17.74 <br /> MW-3 Jan 87 10-30 19.41 <br /> MW-4 Jan 87 10-30 17.85 <br /> MW-5 Jul 87 10-30 19.46 <br /> MW-6 Jul 87 10-30 18.64 <br /> MW-7 Jul 87 10-32 17.34 <br /> MW-8 Feb 88 11-30 16.65 <br /> MW-9 Feb 88 10-30 1 17.08 <br /> MW-10 Apr 88 10-35 18.94 <br /> MW-12 Jan 91 24-39 19.83 <br /> MW-13 May 93 25-45 20.51 <br /> • MTBE THREAT CLASSIFICATION: C <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 WOOS <br /> Maximum Latest Residential Industrial Maximum Latest (ug/L) <br /> (mg/kg) (mg/kg) Dec 07 <br /> TPH-q NA NA NA NA FP 110,000 5 <br /> TPH-d NA NA NA NA FP NA 49 <br /> Benzene NA NA 0.64 1.4 FP 8,170 0.15 <br /> Toluene NA NA 520 520 FP 13,600 42 <br /> Eth (benzene NA NA 400 400. FP 3,550 29 <br /> Xylenes NA NA 270 42Q FP 15,900 17 <br /> MTBE NA NA 32 70 FP 43 5 <br /> TBA NA NA NA NA FP ND 12 <br /> 1,2-DCA NA NA NA NA FP ND 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 /> WOO Water Quality Objectives <br /> FP Free product <br /> V. FREE PRODUCT: RW-3 contained up to 0.98' of free product (Jan 91).. Free <br /> product recovery started in Apr 94. <br /> California Eoviroumeota/Protection Agency <br /> Q7 RecydedPaper <br />