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Mary Sanchez -2- February 8, 2011 <br /> Claim No. 1026 <br /> B. Monitoring Well Information <br /> Well Designation Date Installed Screen Interval Most Recent DTW <br /> feet b s) (May 201 0) <br /> MW-2 Apr 93 ?-44 11.21 <br /> MW-3 Apr 93 7-43 10.63 <br /> MW-4 Sep 94 ?-42 10.50 <br /> MW-5 Sep 94 ?-31 11.42 <br /> MW-6A Apr 01 ?-27 10.35 <br /> MW-613 Apr 01 ?-38 10.34 <br /> MW-7A Apr 01 ?-38 10.50 <br /> MW-713 -Apr 01 ?-38 10.35 <br /> MW-8A Jul 04 ?-29 10.58 <br /> MW-18B Jul 04 ?-37 11.20 <br /> MW-9A Jul 04 ?-29 9.87 <br /> MW-96 Jul 04 ?-40 9.91 <br /> MW-10 Jul 04 ?-43 10.25 <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 Latest (ug/L) <br /> (Apr 2010)* <br /> TPH-9 910 NA 53,000 1,800 5 <br /> Benzene 21 NA 16,000 13 0.15 <br /> Toluene 2.1 NA 3,300 4 42 <br /> Eth (benzene 8.5 NA 2,300 5.5 29 <br /> Xylenes 28 NA 13,000 160 17 <br /> MTBE 0.01 NA 490 1.2 5 <br /> TBA NA NA 70 <5 12 <br /> 1,2-DCA NA NA ND 1 <0.5 0.4 <br /> NA: Not Analyzed, Not Applicable or Data Not Available <br /> mg/kg- milligrams per kilogram, parts per million <br /> ug/L: micrograms per liter, parts per billion <br /> WQOs: Water Quality Objectives <br /> Only Mw-10 sampled <br /> V. FREE PRODUCT: none identified <br /> VI. SOIL AND GROUNDWATER REMEDIATION <br /> A. Soil Excavation: approximately 750 cubic yards of contaminated soil was <br /> excavated in February 2003, removing 6791 pounds of the estimated <br /> 7476 pounds of contaminated soil. <br /> B. In-Situ Soil Remediation: none identified <br /> California En vlronmental Proteetion Ageney <br /> �.a R.,ycled Paper <br />