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Thiemann Service Station -2- March 24, 2009 <br /> Claim No. 1978 <br /> B. Monitoring Well Information <br /> Well Designation Date Installed Screen Interval Most Recent DTW <br /> feet b s Oct 08 <br /> MW-1 Aug93 ?-40 29.15 <br /> MW-2 Aug93 ?-41 29.06 <br /> MW-3 Aug93 ?-40 28.76 <br /> MW-4 Aug96 ?-39 28.73 <br /> MW-5 Aug96 1 ?-40 28.54 <br /> MW-6 Aug96 ?-40 28.33 <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 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 Industrial' Maximum Latest (ug/L) <br /> Soil Dermal (Oct 08) <br /> Residential (mg/kg) <br /> (mg/kg) <br /> TPH-g NA NA 83 450 180,000 1,000 5 <br /> TPH-d NA NA 83 450 NA NA 56 <br /> Benzene NA NA 0.044 0.27 250 <0.5 0.15 <br /> Toluene W NA 2.9 210 8,700 <0.5 42 <br /> Eth (benzene NA NA 2.3 5.0 2,400 65 29 <br /> Xylenes W NA 2.3 100 13,000 13 17 <br /> MTBE NA NA 0.023 65 7.9 1 <0.5 5 <br /> TBA NA NA 0.075 320,000 NA <5 12 <br /> 1,2-DCA NP, NA 0.0045 0.48 NA <0.5 0.4 <br /> Lead NA 1 1 200 750 NA NA 15 <br /> PCE Ni� I NA 0.37 0.95 NA NA 0.06 <br /> TCE NA I 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 /> WQO Water Quality Obje--tives <br /> FP Free phase produc in site wells <br /> V. FREE PRODUCT: none identified <br /> VI. SOIL AND GROUNDWATER REMEDIATION <br /> A. Soil Excavation: unknown volume <br /> B. In-Situ Soil/ Groundwater Remediation: none identified <br /> - CalfforniaEnvironmental ProtecdonAgency <br /> Za Recycled Pape, <br />