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Bank of Stockton -2- April 20, 2010 <br /> Claim No. 1878 <br /> B. Monitoring Well Information <br /> Well Designation Date Installed Screen Interval Most Recent DTW <br /> feet b s Mar 09 <br /> MW-1 Nov 92 35-54 25.96 <br /> MW-4 Nov 92 33-54 26.40 <br /> MW-6 Mar 98 20-45 26.10 <br /> MW-7 Mar 98 20-45 26.58 <br /> MW-813 Mar 98 21-46 26.40 <br /> MW-9 Mar 98 20-45 26.10 <br /> MW-10 Mar 98 20-45 26.37 <br /> MW-11 Mar 98 1 20-45 26.40 <br /> • MTBE THREAT CLASSIFICATION: X <br /> • LAND USE DESIGNATION: 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 Water (ug/L WQOs <br /> Maximum Latest Maximum Latest (ug/L) <br /> Mar 09 <br /> TPH-g NA NA 127,000 22,000 5 <br /> TPH-d NA NA <50 NA 56 <br /> Benzene NA NA 22,500 2,100 0.15 <br /> Toluene NA NA 11,600 2,200 42 <br /> Eth (benzene NA NA 22,500 770 29 <br /> Xylenes NA NA NA 2,400 17 <br /> MTBE NA NA NA 1.2 5 <br /> TBA NA NA NA <20 12 <br /> 1,2-DCA NA NA NA <1 0.4 <br /> Lead _ NA NA NA NA 15 <br /> PCE NA NA NA NA 0:06 <br /> TCE NA NA NA NA 0.8 <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: none identified <br /> VI. SOIL AND GROUNDWATER REMEDIATION <br /> A. Soil Excavation: 2500 yards of contaminated soil were excavated in Jun 91. <br /> California En vironmental Protection Agency <br /> Za Recyded Paper <br />