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Best California Gas -2- May 2, 2011 <br /> Claim No. 13729 <br /> B. Monitoring Well Information <br /> Well Designation Date Installed Screen Interval Depth to Water <br /> (feet bgs) (feet bgs) <br /> Feb 2011 <br /> MW-2 Feb 99 30-60 44.53 <br /> MW-3r Nov 92 40-70 45.03 <br /> MW-4 Nov 92 70-90 45.08 <br /> MW-6 Nov 92 65-90 46.16 <br /> TB-1 Jun 95 40-70 44.34 <br /> TB-7 Jun 95 25-75 44.73 <br /> TB-8 Jun 95 45-75 45.94 <br /> TB-10 Jun 95 20-70 42.63 <br /> EW-5s May 05 40-60 44.31 <br /> EW-5d May 05 65-85 44.28 <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 /> Nov 2010 <br /> TPH-g NA NA 166,000 1,100 5 <br /> Benzene NA NA 18,200 <50 0.15 <br /> Toluene NA NA 39,700 <50 42 <br /> Eth (benzene NA NA 4,400 <50 29 <br /> Xylenes NA NA 24,600 <50 17 <br /> MTBE NA NA 40,400 916 5 <br /> TBA NA NA 28,000 128 1,200- <br /> 1,2-DCA NA NA 3.8 <50 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 /> According to GeoTracker,wells <br /> a California Department of Public Health Response Level <br /> V. FREE PRODUCT: none identified <br /> VI. SOIL AND GROUNDWATER REMEDIATION <br /> A. Soil Excavation: approximately 718 tons of contaminated soil was excavated <br /> and removed from the site in November 2004 <br /> California Environmental Protection Agency <br /> Z,. Recycled Paper <br />