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Super Center Mart -2- May 18, 2009 <br /> Claim No. 12741 <br /> B. Monitoring Well Information <br /> Well Designation Date Installed Screen Interval Most Recent DTW <br /> (feet b s) Dec 08) <br /> MW-1 Dec 98 14-54 32.61 <br /> MW-2 Dec 98 28-48 32.15 <br /> MW-3 Dec 98 28-48 31 .99 <br /> MW-4 Sep 06 28-48 33.05 <br /> MW-7 Apr 04 28-48 32.06 <br /> MW-8a Apr 04 28-48 32.22 <br /> MW-8b Apr 04 80-86 32.25 <br /> MW-8c Air 04 109-123 32.29 <br /> MW-8d Apr 04 140-150 32.29 <br /> MW-9a Apr 04 28-48 30.35 <br /> MW-9b Apr 04 80-86 30.45 <br /> MW-9c Apr 04 109-119 30.55 <br /> MW-9d Apr 04 140-150 30.95 <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 ESLs Water (ug/L WQOs <br /> Maximum Latest Shallow Industrial2 Maximum Latest (ug/L) <br /> Soil Dermal (Dec 08) <br /> Residential (mg/kg) <br /> (mg/kg) <br /> TPH-g NA NA 83 450 330,000 310,000 5 <br /> TPH-d NA NA 83 450 NA NA 56 <br /> Benzene NA NA 0.044 0.27 100,000 12,000 0.15 <br /> Toluene NA NA 2.9 210 300,000 6,700 42 <br /> Eth (benzene NA NA 2.3 5.0 90,000 5,800 29 <br /> Xylenes NA NA 2.3 100 390,000 33,000 17 <br /> MTBE NA NA 0.023 65 4,800 3,500 5 <br /> TBA NA NA 0.075 320,000 1,400 <10 12 <br /> 1,2-DCA NA NA 0.0045 0.48 180 83 0.4 <br /> Lead NA NA 200 750 NA NA 15 <br /> PCE NA NA_ 0.37 0.95 NA NA 0.06 <br /> TCE NA NA 0.46 4.1 NA NA 0.8 <br /> 1 Environmental Screening Levels(ESLs) Shallow Soil<3m,Groundwater is source of Drinking Water. <br /> 2 ESLs.Shallow Soil Screening Levels, Groundwater not source of Drinking Water, Commercial Use, Direct Exposure, <br /> Worker <br /> NA Not Analyzed, Not Applicable. or Data Not Available <br /> WQO Water Quality Objectives <br /> FP Free phase product in site wells <br /> California Environmental Protection Agency <br /> 0 Recycled Paper <br />