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W. Graffigna Jr. and William Graffigna -2- May 9, 2008 <br /> Claim No. 13578 <br /> • SOIL TYPES: interbedded and intermixed sand, silt, and clay <br /> B. Monitoring Well Information <br /> Well Designation Date Installed Screen Interval Most Recent DTW <br /> feet b s Dec 07 <br /> MW-1 Nov 99 45-65 55.22 <br /> MW-2 Nov 99 45-65 55.53 <br /> MW-3 Nov 99 45-65 55.38 <br /> MW-4 Nov 99 45-65 56.19 <br /> MW-5 Apr 04 45-65 55.08 <br /> MW-6 J u 103 45-65 55.21 <br /> MW-7 JUI 03 80-90 55.40 <br /> MW-8 Dec 05 45-65 55.70 <br /> • MTBE THREAT CLASSIFICATION: B <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 WQOs <br /> Maximum Latest Residential Industrial Maximum Latest (ug/L) <br /> (mg/kg) (mg/kg) Dec 07 <br /> TPH-9 NA NA NA NA 180,000 60,000 5 <br /> TPH-d NA NA NA NA NA NA 49 <br /> Benzene NA NA 0.64 1.4 1,000 <0.5 0.15 <br /> Toluene NA NA 520 520 100 <0.5 42 <br /> Eth (benzene NA NA 400 400 58 <0.5 29 <br /> Xylenes NA NA 270 420 1,700 <0.5 17 <br /> MTBE NA NA 32 70 180,000 58,000 5 <br /> TBA NA NA NA NA 19 <10 12 <br /> 1,2-DCA NA NA NA NA <0.5 <0.5 0.5 <br /> Lead NA NA 400 800 NA NA 15 <br /> PCE NA NA 17 130 NA NA 0.06 <br /> TCF NA NA 0.11 110 NA NA 0.8 <br /> PRGs USEPA 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 /> CalifrirnirrEnvirorame�zfQlProlecfion�ger�cy <br /> �.r]1�ecycledPape� <br />