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W. Graffigna Jr, and WTrriam Graffigna -2- April 30, 2009 <br /> Claim No. 13578 <br /> • SOIL TYPES: interbedded and intermixed sand, silt, and clay <br /> B. Monitoring Well Information <br /> Well Designation Date Installed Screen Interval Most Recent DTW <br /> I <br /> (feet b s) (Mar 09) <br /> MW-1 Nov 99 45-65 55.28 <br /> MW-2 Nov 99 45-65 55.62 <br /> MW-3 Nov 99 45-65 55.47 <br /> MW-4 Nov 99 45-65 56.11 <br /> MW-5 Apr 04 45-65 55.05 <br /> MW-6 Jul 03 45-65 55.15 <br /> MW-7 Jul 03 80-90 55.40 <br /> MW-8 Dec 05 i 45-65 55.68 <br /> • MTBE THREAT CLASSIFICATION: B <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 I Soil (mg/kg) j ESLs Water (ug/L WQOs <br /> i Maximum Latest Shallow z Maximum Latest (ug/L) i <br /> Soil' Industrial Mar 09 <br /> i [ <br /> Residential Dermal <br /> (mg/kg) <br /> I <br /> TPH-g NA NA ' 83 1 450 180,000 6,000 5 <br /> TPH-d NA NA ! 83 450 NA NA 56 <br /> Benzene NA NA 0.044 0.27 1,000 <0.5 0.15 <br /> Toluene NA NA 2.9 210 100 <0.5 42 <br /> Eth (benzene NA NA 2.3 5.0 58 <0.5 29 <br /> Xylenes I NA NA 2.3 100 1,700 <0.5 17 <br /> MTBE NA NA 0.023 65 180,000 5,800 5 <br /> TBA NA NA 0.075 320.000 19 <10 12 <br /> 1.2-DCA NA NA 0.0045 0.48 <0.5 1 <0.5 0.4 <br /> Lead NA NA 200 750 NA NA 15 <br /> PCE NA NA 0.37 0.95 NA NA 0.06 <br /> TCE I NA NA 0.46 4.1 NA NA 0.8 <br /> I Environmental Screening Levels(ESLs)Shallow Soil <3m, Groundwater is source of Drinking Water. <br /> 2 ESLs, Shallow Soil Screening Levels, Groundwater not source of Drinking Water, Commercial Use, Direct Exposure, <br /> Worker <br /> NA Not Analyzed, Not Applicable, or Data Not Available <br /> WQO Water Quality Objectives <br /> FP Free phase product in site wells <br /> V. FREE PRODUCT: none identified <br /> VI. SOIL AND GROUNDWATER REMEDIATION <br /> California En s ironmenta/Protection Agencf <br /> C-/tecrc/ed Paper <br />