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ARCO -2- April 14, 2011 <br /> Claim No. 15783 <br /> B. Monitoring Well Information <br /> Well Designation Date Installed Screen Interval Depth to Water <br /> (feet bgs) (feet bgs) <br /> Oct 2010 <br /> MW-1 Sep 00 ?-24 13.76 <br /> MW-2 Sep 00 ?-22 14.09 <br /> MW-3 Sep 00 ?-24 13.14 <br /> MW-4 Jul 02 ?-29 13.35 <br /> MW-5 Jul 02 ?-25 13.65 <br /> MW-6 Aug06 1 ?-60 1 15.21 <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 (ug/L WQOs <br /> Maximum Latest Maximum Latest (ug/L) <br /> Oct 2010 <br /> TPH- NA NA 25,000 3,000 5 <br /> Benzene NA NA 1,820 52 0.15 <br /> Toluene NA NA 503 1 42 <br /> Eth (benzene NA NA 1,500 15 29 <br /> Xylenes NA NA 1,600 5.9 17 <br /> MTBE NA NA 40,000 190 5 <br /> TBA NA NA 35,000 3012 <br /> 1,2-DCA NA NA ND NA 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: none identified <br /> VI. SOIL AND GROUNDWATER REMEDIATION <br /> A. Soil Excavation: unknown volume <br /> B. In-Situ Soil Remediation: none identified <br /> C. Groundwater Remediation: <br /> • METHOD: ozone injection <br /> • DURATION: delayed, Regional Board approved pilot test <br /> California En vfronmental Protection Agency <br /> Q,a Recyc%d Paper <br />