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Knowles Family Trust -2- April 1, 2010 <br /> Claim No. 854 <br /> B. Monitoring Well Information <br /> Well Designation Date Installed Screen Interval Most Recent DTW <br /> feet b s Nov 09) <br /> MW-1 Sep 98 35-65 37.31 <br /> MW-2 Sep 98 35-65 37.34 <br /> MW-3 Sep 98 25-56 - <br /> MW-4 Jan 99 41-71 36.38 <br /> MW-5 Jan 99 41-71 - <br /> MW-9 Nov 03 34-54 36.26 <br /> MW-10D May 06 90-100 37.21 <br /> MW-11 Jun 08 30-50 36.78 <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 (u/L WQOs <br /> Maximum Latest Maximum Latest (ug/L) <br /> Nov 09 <br /> TPH-g NA NA_ 240,000 170,000 5 <br /> TPH-d NA NA NA NA 56 <br /> Benzene NA NA 41,000 39,000 0.15 <br /> Toluene NA NA 18,000 17,000 42 <br /> Eth (benzene NA NA 2,700 2,100 29 <br /> Xylenes NA NA 22,000 19,000 17 <br /> MTBE NA NA 160 <200 5 <br /> TBA NA NA <2,000 <2000 12 <br /> 1,2-DCA NA NA 680 620 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 /> WQO Water Quality Objectives <br /> FP Free phase product in site wells <br /> Only MW-11 sampled <br /> V. FREE PRODUCT: none identified <br /> VI. SOIL AND GROUNDWATER REMEDIATION <br /> A. Soil Excavation: 900 cubic yards of contaminated soil was excavated and <br /> removed in Apr 00 <br /> B. In-Situ Soil/ Groundwater Remediation: none identified <br /> C. Groundwater Trends <br /> California Environmental Protection Agency <br /> .nZJ' Recycled Paper <br />