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Ranch Market -2- • May 5, 2009 <br /> Claim No. 15211 <br /> B. Monitoring Well Information <br /> Well Designation Date Installed Scrfe n I tsrval Most Rec nt DTW <br /> MW-1 Dec 98 ? 28.72 <br /> MW-2 Dec 98 ? 28.24 <br /> MW-3 Dec 98 <br /> MW-4 Dec 98 <br /> MW-5 Au 00 ? 29.06 <br /> 9.57 <br /> MW-5d Au 00 ? 2 <br /> MW-6 Au 00 ? 277.74.74 <br /> MW-7 Au 00 ? 29.75 <br /> MW-8 Auc 29.13 <br /> MW-9 Au 00 ? 32.54 <br /> AS-1• Jul 02 ? 28.66 <br /> MTBE THREAT CLASSIFICATION: A <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 <br /> ESLs Water u /L WQOs <br /> Maximum Latest Shallow Industrial2 Maximum Latest (ug/L) <br /> Soil' (Feb 08) <br /> Dermal <br /> Residential (mg/kg) <br /> m /k <br /> TPH- NA NA 83 450 180,000 2,800 5 <br /> TPH-d NA NA 83 450 NA NA I 56 <br /> Benzene NA NA 0.044 0.27 20,000 160 0.15 <br /> Toluene NA NA 2.9 210 24,000 58 42 <br /> Eth (benzene NA NA 2.3 5.0 4,400 5.5 29 <br /> X lenes NA NA 2.3 100 25,000 130 17 <br /> MTBE <br /> NA NA 0.023 65 380 <0.5 5 <br /> TBA NA NA 0.075 320,000 <2000 <5 12<0.5 0.4 <br /> 1,2-DCA NA NA 0.0045 0.48 70 <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 /> f Environmental Screening Levels(ESLs)Shallow Soil<3m,Groundwater is source of Drinking Water. <br /> Z 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 /> woo Water Quality Objectives <br /> FP Free phase product in site wells <br /> V. FREE PRODUCT: monitoring well MW-3 has contained up to 0.5 feet of free <br /> product. <br /> California Environmental Protection Agency <br /> fid'Recycled Paper <br />