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..Best.California Gas —2- May 5, 2009 <br /> Claim No. 13729 <br /> _ E <br /> B. Monitoring Well Information <br /> Well Designation !!Date Installed Screen Interval Most Recent DTW <br /> I{ feet b s Mar 09 <br /> MW-2 Feb 99 30-60 42.90 <br /> MW-3r '' Nov 92 40-70 42.88 <br /> MW-4 Nov 92 70-90 42.90 <br /> MW-6 ; Nov 92 65-90 44.13 I <br /> TB-1 ' Jun 95 40-70 42.36 <br /> TB-7 Jun 95 25-75 42.80 <br /> TB-8 Jun 95 45-75 43.71 <br /> TB-10 s Ju"n 95 20-70 42.00 <br /> EW-5s May 05 40-60 42.36 <br /> EW-5d May 05 65-85 42.41 I <br /> i <br /> • MTBE THREAT CLASSIFICATION: X <br /> • LAND USE DESIGNATION: residential and commercial <br /> • ESTIMATED WATER QUALITY OBJECTIVES (WQO'S) FOR SITE: Per the <br /> Water Quality Coni;rol Plan (Basin Plan) for the Sacramento River Basin and the , <br /> San Joaquin River Basin (Fourth Edition). E <br /> IV. MAXIMUM DOCUMENTED CONTAMINANT CONCENTRATIONS <br /> Contaminant Soil m�Ik P ESLs Waterr (ug/L WQOs <br /> Maximum Latest Shallow 2 Maximum Latest (ug/L) <br /> II Soil' Industrial (Mar 09) <br /> Residential Dermal <br /> m Ik (mglkg) <br /> TPH-g NA NA 83 450 166,000 38,400 5 <br /> TPH-d NA NA 83 450 NA NA 56 <br /> Benzene NA NA 0.044 0.27 18,200, 396 0.15 i <br /> Toluene NA NA 2.9 210 39,700 6,250 42 <br /> Eth (benzene NA NA 2.3 5.0 4,400 1,640 29 <br /> Xylenes NA NA 2.3 100 24,600 5,050 17 k <br /> MTBE NA NA 0.023 65 40,400 314 5 ` <br /> TBA NA NA 0.075 320,000 28,000 <250 12 i <br /> 1,2-DCA NA NA 0.0045 0.48 3.8 <125 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 /> r. f: <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 i <br /> NA Not Analyzed, Not Applicable,or Data Not Available <br /> WOO Water Quality Objectives <br /> FP Free phase product in site wells ' <br /> V. FREE PRODUCT: none identified <br /> VI. SOIL AND GROUNDWATER REMEDIATION + <br /> A. Soil Excavation: unkno„wn volume <br /> CaGforaia En vlronmeatel Protection Agency <br /> �.r�Recycled Paper <br />