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k <br /> SIERRA DRILLING Co. <br /> P.O. Box 4931 <br /> Modesto, CA 9535) Jan. , 22 1990 <br /> Dear Sir, <br /> This letter is ;to certify that Sierra Drilling authorizes United States <br /> Testing Co. to ,.se our name on the permit application as the drilling <br /> agent for the Gateway Business Park project. <br /> 4' <br /> j 'geed by: <br /> PAUL PIERSON t` <br /> For: Sierra Drilling Date: <br /> 3 <br /> r <br /> k <br /> i <br /> 1 <br /> Y <br /> I 3 <br /> 1 <br /> [rFr <br /> f <br />