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VINA ,ssL:> <br />1985'/2 SOUTH BROADWAY <br />I` GRAND JUNCTION, CO 81507 9649 <br />V" igni <br />DAUB & ASSOCIATES, INC. <br />(970) 254-1224 <br />,? ?,,p„/ ,\ ,?`` f?,?? ''??1 FAX (970) 242-8438 <br />4 email: gjdaub@daubandassociates.com <br />www.daubandassociates.com <br />August 25, 2010 g <br />Mr. Travis Marshall <br />Grand Junction Field Office / AUG Z7 1ILiJ <br />Colorado Division of Reclamation, Mining and Safety GRAND .t? v OFFICE <br />DIVit iQN OF <br />101 South 3rd, Suite 301 REGlAMATk`. MINING & SAFETY <br />Grand Junction, CO 81501 i <br />Re: Natural Soda, Inc. Elevated Conductivity Levels in BG-5 Groundwater Samples <br />Dear Mr. Marshall: <br />The attached document contains information regarding what appears to be a transient <br />increase in conductivity and other water chemistry levels for the BG-5 groundwater <br />monitoring well. Elevated readings were noted in some of the water chemistry <br />constituents in the May and June 2010 groundwater samples from the B-Groove Aquifer. <br />Analysis of samples obtained in July and early August indicate a return to near baseline <br />conditions. A review of BG-5 (12H-C) well construction and development and plant <br />operations was undertaken in attempt to understand the anomaly. Results of that review <br />are presented along with water chemistry data tables and charts. <br />Should you have any questions or comments, please contact me at (970) 254-1224 or <br />(970) 216-1010 (c), or Bob Warneke at (970) 878-3674 x14. <br />Regards, <br />Gerald J. Daub, PG, CPG <br />President <br />Daub & Associates, Inc. <br />Cc: Bob Warneke <br />Executive Director of Manufacturing <br />Natural Soda, Inc. <br />Paul Daggett <br />Bureau of Land Management (WRFO) <br />File <br />I .SVr--D <br />SrP i n¢ <br />Divivo ; <br />Per g and ??WV:y <br />SPECIALIZING IN PROFESSIONAL GEOLOGICAL, ENVIRONMENTAL, HYDROLOGICAL, GEOTECHNICAL AND PERMITTING SERVICES