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Super Center Mart -2- April 25, 2008 <br /> Claim No. 12741 <br /> B. Monitoring Well Information <br /> Well Designation Date Installed Screen Interval Most Recent DTW <br /> feet b s) (Dec 07) <br /> MW-1 Dec 98 14-54 32.07 <br /> MW-2 Dec 98 28-48 32.60 <br /> MW-3 Dec 98 28-48 32.46 <br /> MW-4 Sep 06 28-48 32.53 <br /> MW-7 Apr 04 28-48 32.40 <br /> MW-8a Apr 04 28-48 32.82 <br /> MW-81D Apr 04 80-86 32.84 <br /> MW-8c Apr 04 109-123 - <br /> MW-8d Apr 04 140-150 - <br /> MW-9a Apr 04 28-48 30.98 <br /> MW-9b Apr 04 80-86 31.05 <br /> MW-9c Apr 04 109-119 31.16 <br /> MW-9d Apr 04 140-150 31.44 <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 WQOs <br /> Maximum Latest Residential Industrial Maximum Latest (ug/L) <br /> (mg/kg) (mg/kg) Dec 07 <br /> TPH-g NA NA NA NA 330,000 220,000 5 <br /> TPH-d NA NA NA NA NA NA 49 <br /> Benzene NA NA 0.64 1.4 100,000 6,700 0.15 <br /> Toluene NA NA 520 520 300,000 6,600 42 <br /> Eth (benzene NA NA 400 400 90,000 3,700 29 <br /> Xylenes NA NA 270 420 390,000 13,000 17 <br /> MTBE NA NA 32 70 4,800 3,800 5 <br /> TBA NA NA NA NA 1,400 NA 12 <br /> 1,2-DCA NA NA NA NA 180 140 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 /> California Environmental Protection Agency <br /> Prd Rec. ded Paper <br />