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Knowles Family Trust b -2- March 21, 2008 <br /> Claim No. 854 <br /> B. Monitoring Well Information <br /> Well Designation Date Installed Screen Interval Most Recent DTW <br /> feet b s (Nov 07 <br /> MW-1 Sep 98 35-65 37.71 <br /> MW-2 Sep 98 35-65 37.74 <br /> MW-3 Sep 98 25-56 36.13 <br /> MW-4 Jan 99 41-71 36.70 <br /> MW-5 Jan 99 41-71 36.32 <br /> MW-9 Nov 03 34-54 36.65 <br /> MW-10D May 06 90-100 37.55 <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 PRGs Water (ug/L WQOs <br /> Maximum Latest Residential Industrial Maximum Latest (ug/L) <br /> (mg/kg) (mg/kg) Nov 07 <br /> TPH-g NA NA NA NA 100,000 23,000 5 <br /> TPH-d NA NA NA NA NA NA 49 <br /> Benzene NA NA 0.64 1.4 7,400 260 0.15 <br /> Toluene NA NA 520 520 7,200 240 42 <br /> Eth (benzene NA NA 400 400 1,600 1,000 29 <br /> Xylenes NA NA 270 420 8,000 4,700 17 <br /> MTBE NA NA 32 70 NA NA 5 <br /> TBA NA NA NA NA NA NA 12 <br /> 1,2-DCA NA NA NA NA NA NA 0.5 <br /> Lead NA NA 400 800 NA NA 15 <br /> PCE NA NA 17 130 NA NA 0.06 <br /> TCE NA NA 0.11 110 NA NA 0.8 <br /> PRGs USEPA Region 9 Preliminary Remediation Goals <br /> MCL Maximum Contaminant Levels <br /> AL Action Level <br /> NA Not Analyzed, Not Applicable, or Data Not Available <br /> WOO Water Quality Objectives <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 /> California Environmenta/Protection Agency <br /> ID <br /> ZG}Recyc%d Paper <br />