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Chevron Products -2- J March 24, 2009 <br /> Claim No. 5820 <br /> B. Monitoring Well Information <br /> Well Designation Date Installed Screen Interval Most Recent DTW <br /> feet b s (Aug08 <br /> MW-3 Mar 91 ?-60 22.27 <br /> MW-5 Nov 92 ?-55 23.06 <br /> MW-6 Nov 93 ?-58 22.27 <br /> MW-7 Dec 95 ?-52 21.95 <br /> MW-8 Nov 97 ?-42 22.19 <br /> MW-9 Jul 02 ?-33 - <br /> MW-13 Apr 04 ?-30 21.96 <br /> MW-14 Apr 04 ?-30 22.29 <br /> MW-15 Apr 04 ?-51 22.21 <br /> MW-15d Apr 04 ?-57 22.22 <br /> MW-16 Apr 04 ?-30 21.57 <br /> MW-17 Apr 04 ?-30 22.14 <br /> IAW-18d2 Dec 07 ?-106 22.34 <br /> • MTBE THREAT CLASSIFICATION: D <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 dustrial 2 Maximum Latest (ug/L) <br /> Soil' In (Aug 08) <br /> Residential Dermal <br /> m /k (mg/kg) <br /> TPH-g NA NA 83 450 29,000 16,000 5 <br /> TPH-d NA NA 83 450 NA NA 56 <br /> Benzene NA NA 0.044 0.27 630 470 0.15 <br /> Toluene NA NA 2.9 210 2,400 900 42 <br /> Eth (benzene NA NA 2.3 5.0 1,300 1,000 29 <br /> X lenes NA NA 2.3 100 4,100 2,200 17 <br /> MTBE NA NA 0.023 65 110 0.8 5 <br /> TBA NA NA 0.075 320,000 460 5 12 <br /> 1,2-DC:A NA NA 0.0045 0.48 NA NA 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 En vironmental Protection Agency <br /> 0 Recvcled Paper <br />