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W. Graffigna Jr. and William Graffigna -2- May 13, 2010 <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 09 <br /> MW-1 Nov 99 45-65 57.63 <br /> MW-2 Nov 99 45-65 57.98 <br /> MW-3 Nov 99 45-65 57.81 <br /> MW-4 Nov 99 45-65 58.46 <br /> MW-5 Apr 04 45-65 - <br /> MW-6 Jul 03 45-65 57.55 <br /> MW-7 Jul 03 80-90 57.77 <br /> MW-8 Dec 05 45-65 58A6 <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 /kg) Water (ug/L WQOs <br /> Maximum Latest Maximum 1 Latest (ug/L) <br /> Mar 2010 <br /> TPH-9 NA NA 180,000 1,300 5 <br /> TPH-d NA NA NA NA 56 <br /> Benzene NA NA 1,000 <0.5 0.15 <br /> Toluene NA NA 100 1 <0.5 42 <br /> Eth ibenzene NA NA 58 <0.5 29 <br /> X lenes NA NA 1,700 <0.5 17 <br /> MTBE NA NA 180,000 1,30p 5 <br /> TBA NA NA 19 <10 12 <br /> 1,2-DCA NA NA X0.5 X0.5 0.4 <br /> Lead NA NA NA NA 15 <br /> PCE NA NA NA NA 0.06 <br /> TCE NA NA NA NA p.$ <br /> NA Not Analyzed, Not Applicabte,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 /> California Environmenta]Protection Agency <br />