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ARCO -2- April 14, 2009 <br /> Claim No. 15783 <br /> B. Monitoring Well Information <br /> Well Designation Date Installed Screen Interval Most Recent DTW <br /> feet b s Oct 08 <br /> MW-1 Sep 00 ?-24 14.04 <br /> MW-2 Sep 00 ?-22 14.72 <br /> MW-3 Sep 00 ?-24 13.74 <br /> MW-4 Jul 02 ?-29 13.99 <br /> MW-5 Jul 02 ?-25 14.28 <br /> MW-6 Aug06 ?-60 16.12 <br /> • MTBE THREAT CLASSIFICATION: C <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 dustrial2 Maximum Latest (ug/L) <br /> Soil' In (Oct 08) <br /> Residential Dermal <br /> m /k (mg/kg) <br /> TPH- NA NA 83 450 25,000 1,800 5 <br /> TPH-d NA NA 83 450 NA NA <br /> Benzene NA NA 0.044 0.27 1,820 150 6 <br /> 0 56 <br /> Toluene NA NA 2-67---- .15 <br /> 210 503 <1 42 <br /> Eth Ibenzene NA NA 2.3 5.0 1,500 16 29 <br /> Xylenes NA NA 2.3 100 1,600 4.8 17 <br /> MTBE NA NA 0.023 65 40,000 570 5 <br /> TBA NA NA 0.075 320,000 35,000 670 12 <br /> 1,2-DCA NA NA 0.0045 0.48 ND 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 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 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: unknown volume <br /> B. In-Situ Soil Remediation: none identified <br /> CRAfornia Environmental Protection Agency <br /> Za Recyc%d Paper <br />