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1985'V2 SOUTH BROADWAY <br /> DAUB 8�ASSOCIATES, INC. I` GRAND JUNCTION,CO 81507-9649 <br /> _ .jam (970)254-1224 <br /> FAX(970)242-8438 <br /> email: gjdaub@daubandassociates.com <br /> www.daubandassociates.com <br /> May 4, 2022 <br /> RCEIV ,m <br /> Mr. William Gallant <br /> U.S. Environmental Protection Agency, Region 8 MAY 10 2022 <br /> Mail Code: 8WD-SDU <br /> 1595 Wynkoop Street DIVISION S RECLAMATION,IA <br /> Denver, CO 80202-1129 MINING &S�aF_ <br /> Subject: Natural Soda, LLC (NS) 12H-IR Notification of Proposed Pull-back (UIC <br /> Permit#C030358-11410) <br /> Dear Mr. Gallant: <br /> NS will be performing a pull-back operation on May 11-12, 2022. This pull-back is <br /> necessary to return the 12H-IR to production. A bittsub assembly and two joints of drill <br /> pipe were left inside the liner at ~2,900 feet MD while cleaning the production string. A <br /> cast iron bridge plug will be set in the 7-inch OD production liner at —2,650 feet MD GL, <br /> and an approximate 30-foot interval of the production liner will be perforated from 2,567 <br /> to 2,600 feet MD GL. The exact plugging and perforation interval are yet to be <br /> determined and rely on production liner conditions. Attached is a proposed pull-back <br /> well completion diagram. <br /> If you require additional information, or have questions or comments, please contact me <br /> at (970) 254-1224 (o) or(970)216-1010 (c), or Kirk Daehling at(970) 456-1268. <br /> Regards, <br /> _',�-/ Se, <br /> Gerald J. Daub, P.G., C.P.G. <br /> President, <br /> Daub &Associates, Inc. <br /> Cc: <br /> Bill Mills, BLM, with enclosures and sundry notice <br /> Kirk Daehling, Natural Soda LLC, with enclosures <br /> Amy Yelldell, CODRMS, with enclosures <br /> File with enclosures <br /> SPECIALIZING IN PROFESSIONAL GEOLOGICAL, ENVIRONMENTAL,HYDROLOGICAL,GEOTECHNICAL AND PERMITTING SERVICES <br />