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Thrifty Oil -2- y April 15, 2010 <br /> Claim No. 2156 <br /> • SOIL TYPES: interbedded and intermixed sand, silt, and clay <br /> B. Monitoring Well Information <br /> Well Designation Date Installed Screen Interval Most Recent DTW <br /> feet b s Feb 09 <br /> MW-3 May 91 45-75 34.61 <br /> MW-4 Jun 91 45-75 35.74 <br /> MW-5 Feb 96 40-60 33.41 <br /> MW-6 Feb 96 40-60 33.05 <br /> MW-7 May 94 26-56 34.81 <br /> MW-9 Feb 96 40-60 33.73 <br /> MW-10 May 96 38-58 34.45 <br /> MW-11 R Jun 08 38-58 36.58 <br /> MW-12R Jun 08 68-75 37.16 <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 /kg) Water (u/L WQOs <br /> Maximum Latest Maximum Latest (ug/L) <br /> Feb 09 <br /> TPH-g NA NA 316,000 19,100 5 <br /> TPH-d NA NA_ NA NA 56 <br /> Benzene NA NA 26,500 275 0.15 <br /> Toluene NA NA 33,900 3,670 42 <br /> Eth (benzene NA NA 6,680 792 29 <br /> Xylenes NA NA 31,400 4,250 17 <br /> MTBE NA NA 39,500 <25 5 <br /> TBA NA NA 13,400 <250 12 <br /> 1,2-DCA NA NA NA NA 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 /> V. FREE PRODUCT: none identified <br /> VI. SOIL AND GROUNDWATER REMEDIATION <br /> A. Soil Excavation: 1,500 cubic yards of contaminated soil was excavated in 1995. <br /> California Environmental Protection Agency <br /> C.fl <br /> 4 Recycled Paper <br />