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i <br /> U I <br /> Balbir Grewal -2- April 25, 2008 I <br /> Claim No. '13651 <br /> B; <br /> Monitoring Well Information <br /> Well Designation Date Installed Screen Interval Most Recent DTW <br /> feet b s Oct 07 ' <br /> MW-1 Feb 00 50-70 52.50 <br /> MW-2 Feb 00 50-70 51.05 <br /> MW-3 Feb 00 50-70 51.22 <br /> MW-4 Feb 02 48-68 51.86. <br /> • MTBE THREAT CLASSIFICATION: D <br /> • LAND USE DESIGNATION: residential and commercial - . - <br /> 0 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 /> 1V., MAXIMUM DOCUMENTED CONTAMINANT CONCENTRATIONS <br /> Contaminant Soil m /kg), PRGs Water (ug/L WQOS <br /> Maximum Latest Residential Industrial Maximum Latest (ug/L) <br /> (mg/kg) m /K Oct 07 <br /> TPH-g NA NA NA NA 490 .<50 5 <br /> TPH-d NA NA NA NA 430 <50 49 <br /> Benzene NA NA 0.64 1.4 .6.2 <0.5 0,15 <br /> Toluene NA NA 520 520 1.3 <0.5 42 <br /> Eth (benzene NA . NA 400 400 55 <0.5 -29 <br /> Xylenes NA NA 270 420 8.3 <0.6 17 <br /> MTBE NA NA 32 70 22 61 5 <br /> TBA NA NA NA NA 55 <10 12 <br /> 1,2-DCA NA NA NA NA 60 58 0.5 <br /> Lead NA NA 400 800 NA NA 15 <br /> PCE NA NA 17 130 NA NA 0.06 <br /> TCE NA NA 0.11 110 NA NA 0.8 <br /> i <br /> PRGs 'USEPA Region 9 Preliminary Remediation Goals ; <br /> MCL Maximum Contaminant Levels <br /> AL Action Level <br /> NA Not Analyzed, Not Applicable,or Data Not Available <br /> WOO 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 /> i <br /> California Environmental Protection Agency <br /> Cc,,Recycled Paper <br />