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Bank of Stockton -2- March 24, 2009 <br /> Claim No. 1878 <br /> B. Monitoring Well Information <br /> Well Designation Date Installed Screen Interval Most Recent DTW <br /> feet b s Jun 08 <br /> MW-1 Nov 92 35-54 26.32 <br /> MW-4 Nov 92 33-54 26.82 <br /> MW-6 Mar 98 20-45 26.64 <br /> MW-7 Mar 98 20-45 27.09 <br /> MW-8B Mar 98 21-46 27.00 <br /> MW-9 Mar 98 20-45 26.72 <br /> MW-10 Mar 98 20-45 27.03 <br /> MW-11 Mar 98 20-45 27.11 <br /> • MTBE THREAT CLASSIFICATION: X <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 WOOs <br /> Maximum Latest Shallow Industrial2 Maximum Latest (ug/L) <br /> Soil Dermal (Sep 08) <br /> Residential (mg/kg) - <br /> m /k <br /> TPH-g NA NA 83 450 127,000 67,000 5 <br /> TPH-d NA NA 83 450 <50 NA 56 <br /> Benzene NA NA 0.044 0.27 22,500 6,500 0.15 <br /> Toluene NA NA 2.9 210 11,600 5,800 42 <br /> Eth lbenzene NA NA 2.3 5.0 22,500 1,900 29 <br /> Xylenes NA NA 2.3 100 NA 6,300 17 <br /> MTBE NA NA 0.023 65 NA NA 5 <br /> TBA NA NA 0.075 320,000 NA NA 12 <br /> 1,2-DCA 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 /> V. FREE PRODUCT: none identified <br /> VI. SOIL AND GROUNDWATER REMEDIATION <br /> A. Soil Excavation: unknown volume <br /> California Environmental Protection Agency <br /> �a Recvc%d Paper <br />