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Jose Garcia -2- February 24, 2011 <br /> Claim No. 8790 <br /> B. Monitoring Well Information <br /> Well Designation Date Installed Screen Interval Depth to Water <br /> (feet bgs) (feet bgs) <br /> Dec 09 <br /> MW-1 Au 88 40-60 50.36 <br /> MW-2 Jun 91 40-60 50.92 <br /> MW-3 Jun 91 40-60 50.03 <br /> MW-4 Nov 03 40-60 50.00 <br /> MW-5 Nov 03 40-60 50.45 <br /> MW-6 Nov 03 40-60 49.80 <br /> MW-7 Apr 08 40-60 50.08 <br /> MW-8 Apr 08 40-60 49.50 <br /> MW-9 Apr 08 40-60 49.43 <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 Water (u/L WQOs <br /> Maximum Latest Maximum Latest (ug/L) <br /> Dec 09 <br /> TPH-g NA NA 26,000 10,000 5 <br /> TPH-d NA NA 55 55 56 <br /> Benzene NA NA 520 150 0.15 <br /> Toluene NA NA 2,500 280 42 <br /> Eth (benzene NA NA 1,500 440 29 <br /> Xylenes NA NA 5,300 1,300 17 <br /> MTBE NA NA 9.8 9.4 5 <br /> NA NA 18 12 <br /> 1,2-DCA NA I NA 28 19 0.5 <br /> NA: Not Analyzed, Not Applicable or Data Not Available <br /> mg/kg: milligrams per kilogram, parts per million <br /> ug/L: micrograms per liter, parts per billion <br /> WQOs: Water Quality Objectives <br /> V. FREE PRODUCT: free product has been identified in MW-1 up to 0.52 feet (Jun 91), <br /> free product has been identified in MW-2 up to 0.62 feet (Jun 91), and free product has <br /> been identified in MW-3 up to 0.68 feet (Jun 91), none noted since 1991. <br /> VI. SOIL AND GROUNDWATER REMEDIATION <br /> A. Soil Excavation: unknown volume excavated in Apr 00. <br /> B. Estimate of Residual Mass: <br /> • Groundwater: 4.6 pounds of TPI-Ig <br /> • Soil: 4,250 pounds of TPI-Ig <br /> California Environments/Protection Agency <br /> A <br /> �d RecydedPaper <br />