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1 <br /> Thiemann Service Station -2- April 11, 2008 <br /> Claim No. 1978 <br /> B. Monitoring %'Veil Information <br /> Well Designation Date Installed Screen Interval Most Recent DTW <br /> feet b s Oct 07 <br /> MW-1 Aug93 ?-40 28.92 <br /> MW-2 Aug93 ?-41 29.03 <br /> MW-3 Aug93 ?-40 28.64 <br /> MW-4 Aug96 ?-39 28.61 <br /> MW-5 Aug96 ?-40 28.38 <br /> MW-6 Au 96 ?-40 28.20 <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 PRGs Water (ug/L woos <br /> Maximum Latest Residential Industrial Maximum Latest (ug/L) <br /> (mg/kg) (mg/kg) Oct 07 <br /> TPH-g NA NA NA NA 180,000 1,100 5 <br /> TPH-d NA NA NA NA NA NA 49 <br /> Benzene NA NA 0.64 1.4 250 <0.5 0.15 <br /> Toluene NA NA 520 520 8,700 <0.5 42 <br /> Eth (benzene NA NA 400 400 2,400 56 29 <br /> Xylenes NA NA 270 420 13,000 7.7 17 <br /> MTBE NA NA 32 70 7.9 <0.5 5 <br /> TBA NA NA NA NA NA <5 12 <br /> 1,2-DCA NA NA NA NA NA <0.5 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 /> PRGs USEPA Region 9'reliminary Remediation Goals <br /> MCL Maximum Contarn nant Levels <br /> AL Action Level <br /> NA Not Analyzed,Not Applicable,or Data Not Available <br /> WOO Water Quality Obj.ctives <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 /> Calijorn is En vironm en tai Pratectron Agency <br /> A <br /> . P.d RerydedPapei <br />