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Charles Skobrak ` -2- May 7, 2009 <br /> Claim No. 1028 <br /> B. Monitoring Well Information <br /> Well Designation Date Installed Screen Interval Most Recent DTW <br /> feet b s (Aug08 <br /> MW-1 Feb 92 55-75 31.45 <br /> MW-2 Feb 92 54-74 31.04 <br /> MW-3 Feb 92 54-74 31.47 <br /> MW-4 Feb 92 45-70 31.55 <br /> MW-5 May 08 - 32.35 <br /> MW-6 May 08 - 31.62 <br /> MW-7 Jul 97 54-74 32.35 <br /> MW-8 May 08 - 31.58 <br /> MW-9 May 08 - 31.71 <br /> VW-2b Jul 97 44-54 - <br /> VW-3 Jul 97 35-55 - <br /> VW-4 Jul 97 34-54 - <br /> VW-5b Jul 97 26-41 - <br /> VW-5c Jul 97 45-55 - <br /> • MTBE THREAT CLASSIFICATION: D <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 ESLs Water (ug/L WQOS <br /> Maximum Latest Shallow Industrial2 Maximum Latest (ug/L) <br /> Soil Dermal (Dec 08) <br /> Residential (mg/kg) <br /> m /k <br /> TPH- NA NA 83 450 760,0000 760,000 5 <br /> TPH d NA NA 83 450 56,000 13,000 56 <br /> Benzene NA NA 0.044 0.27 150,000 28,000 0.15 <br /> Toluene NA NA 2.9 210 56,000 560 42 <br /> Eth (benzene NA NA 2.3 1 5.0 57,000 2,800 29 <br /> Xylenes NA NA 2.3 100 218,000 2,140 17 <br /> MTBE NA NA 0.023 65 2,600 1,200 5 <br /> TBA NA NA 0.075 320,000 37 <10 12 <br /> 1,2-DCA NA NA 0.0045 0.48 2,100 NA 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 NA NA 0.46 4.1 NA NA 0.8 <br /> 1 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 /> WOO Water Quality Objectives <br /> FP Free phase product in site wells <br /> California Environmental Protection Agency <br /> :tea Recycled Paper <br />