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J & B Murphy Trucking- -2- April 23, 2008 <br /> Claim No. 16575 <br /> B. Monitoring Well Information <br /> Well Designation Date Installed Screen Interval Most Recent DTW . <br /> feet b s Feb 08 <br /> MW-1 Feb 02 15-20 6.74 <br /> MW-2 Feb 02 30-35 7.40 <br /> MW-3 Feb 02 5-20 7.00 <br /> MW-4 Feb 02 5-20 6.78 <br /> MW-5 Feb 02 5-20 6.85 <br /> EW-1 Feb 02 5-20 5.50 <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 Pian) 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 PBGs Water (ug/L WQOs <br /> Maximum Latest Residential Industrial Maximum Latest (ug/L) <br /> (mg/kg) m Ik Feb 08 <br /> TPH-g NA NA NA NA 1,500 <50 5 <br /> TPH-d NA NA NA NA 6,600 <50 49 <br /> Benzene NA NA 0.64 1.4 <0.5 NA 0.15 <br /> Toluene NA NA 520 520 <0.5 NA 42 <br /> Eth (benzene NA NA 400 400 <0.5 NA 29 <br /> Xylenes NA NA 270 420 <0.5 NA 17 <br /> MTBE NA NA 32 70 <1 NA 5 <br /> TBA NA NA NA NA <10 NA 12 <br /> 1,2-DCA NA NA NA NA <0.5 NA 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 USPPA Region 9 Preliminary Remediation Goals <br /> MCL Maximum Contaminant Levels <br /> AL Action Level <br /> NA Not Analyzed, Not Applicable,or Data Not Available <br /> WQO Water Quality Objectives <br /> V. FREE PRODUCT: none identified <br /> VI. SOIL AND GROUNDWATER REMEDIATION <br /> A. Soil Excavation: unknown volume <br /> B. In-Situ Soil Remediation: none identified <br /> C. Groundwater Remediation: <br /> • METHOD: monitored natural attenuation <br /> • DURATION: Apr 07 through present <br /> CON&FR&En vironmental Protection Agency <br /> �rt�Recyded Paper <br />