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Lopez Property -2- August 2, 2010 <br /> Claim No. 18245 <br /> B. Monitoring Well Information <br /> Well Designation Date Installed Screen Interval Most Recent DTW <br /> feet b s Dec 2009 <br /> MW-1 Nov 04 10-30 19.17 <br /> MW-2 Nov 04 15-35 19.51 <br /> MW-3 Nov 04 15-35 18.87 <br /> MW-4 Dec 06 15-35 19.18 <br /> MW-5 Dec 06 15-35 19.46 <br /> MW-6 Dec 06 15-35 19.21 <br /> MW 7 Dec 06 15-35 19.30 <br /> MW-8 Dec 06 55-65 19.41 <br /> MW-9 Aug07 11-120 19.80 <br /> MW-10 Aug07 50-60 19.30 <br /> MW-11 Aug07 55-65 19.46 <br /> • MTBE THREAT CLASSIFICATION: X <br /> • LAND USE DESIGNATION: commercial and residential <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 Water u /L WQOs <br /> Maximum Latest Maximum Latest (ug/L) <br /> Ma 2010 <br /> TPH- NA NA 240,000 240,000 5 <br /> TPH-d NA NA NA NA 56 <br /> Benzene NA NA 14,000 7,600 0.15 <br /> Toluene NA NA 85,000 49,000 42 <br /> Eth (benzene NA NA 16,000 9,400 29 <br /> Xylenes NA NA 79,000 57,000 17 <br /> MTBE NA NA NA NA 5 <br /> TBA NA NA NA NA 12 <br /> 1,2-DCA NA NA 1,300 100 0.4 <br /> Lead NA NA NA NA 15 <br /> PCE NA NA NA NA 0.06 <br /> TCE NA NA NA NA 0.8 <br /> NA Not Analyzed, Not Applicable,or Data Not Available <br /> WOO 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 /> CaGforma Environmenta/Protection Agency <br />