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Chevron Products -2- March 3, 2011 <br /> Claim No. 5820 <br /> B. Monitoring Well Information <br /> Well Designation Date Installed Screen Interval Depth to Water <br /> (feet bgs) (feet bgs) <br /> MW-3 Mar 91 35-60 Aug 201021.53 <br /> MW-5 Nov 92 35-60 22.18 <br /> MW-6 Nov 93 35-60 21.43 <br /> MW-7 Dec 95 32-52 21.03 <br /> MW-8 Nov 97 22-42 21.23 <br /> MW-9 Jul 02 52-57 - <br /> MW-13 Apr 04 19-34 21.10 <br /> MW-14 Apr 04 20-30 21.46 <br /> MW-15 Apr 04 20-30 21.13 <br /> MW-15d A r'04 46-51 21.40 <br /> MW-16 Apr 04 20-30 20.82 <br /> MW-17 Apr 04 20-30 21.36 <br /> IAW-18d2 Dec 07 100-105 21.56 <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 /> (Aug2010 <br /> TPH-g NA NA 160,000 5,900 5 <br /> TPH-d NA NA 9,900 2,400 56 <br /> Benzene NA NA 25,000 160 0.15 <br /> Toluene NA NA 52,000 17 42 <br /> Eth IbEinzene NA NA 5,600 150 29 <br /> Xylenes NA NA 27,000 96 17 <br /> MTBE NA I NA 1 110 2 5 <br /> TBA NA NA 460 89 12 <br /> 1,2-DCA NA NA NA 0.7 0.5 <br /> NA: Nct 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 /> FP Free phase product in site wells <br /> V. FREE PRODUCT: up to 0.15 feet of free phase hydrocarbons noted in MW-9, none <br /> noted since October 2002. <br /> VI. SOIL AND GROUNDWATER REMEDIATION <br /> California Environmental Protection Agency <br /> Zd Awyc ed Pape.- <br /> _ <br />