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AZURE <br /> �-E.NVIRONMENTAL. <br /> After pressure grouting the three wells, the well boxes . ere removed and each well was <br /> overdrilled to a depth of three feet below grade using 10-inch diameter augers to excavate the <br /> PVC well casings and surrounding materials. The cement grout.sealing material in the upper . <br /> portion of the well casing was allowed to fill the bottoin of the overdrill excavation and was <br /> topped off to form a one-foot thick cement"mushroo cap". After allowing the cement to <br /> stiffen,the,cement cap was covered with a few,inches of compacted clean fill and base rock. The <br /> ground surface at each well location was restored to surface grade using cement patch. Waste <br /> material generated during the well destruction activitie 3,consisted of a small alnour,it.of broken <br /> concrete and well box materials that were disposed in I he station dumpster. <br /> CONCLUSIONS <br /> Three monitoring wells were,properly destroyed.at the Site on May 26, 2009 in accordance with <br /> the No Further Action concurrence in.the RWQCB's ay5, 2009 letter and SJCEHD well <br /> destruction permit requirements. Upon review and approval of this letter report, it is our <br /> understanding the SJCEHD will issue a case closure-1 er to Tesoro indicating'inYestigations and <br /> corrective actions are complete and no further actions are-required.- <br /> 'Please feel free to call me at 415/488-1738 if you have any,questions. <br /> Sincerely, )NAL GF <br /> * <br /> No 4605 <br /> Jeff Hennier, PG, CHg. s5z.�� zp <br /> Principal Hydrogeologist OF CA1NV <br /> cc; -Jeff Baker <br /> Tesoro Environmental Resources Co. <br /> 3.450 S. 344thWay #201 <br /> Auburn,WA .98001 <br /> Chuck Miller <br /> USA Petroleum <br /> 905 Rancho Conejo Blvd. <br /> Newbury Park, CA 91320-171.6 <br /> Brian Kelleher, Kelleher&Associates <br /> 812 S.Winchester Blvd. <br /> Ste.,130 PMB. 109 <br /> San Jose, CA 95128 . <br /> 2 <br />