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CO LO �R ADO <br /> Division of Reclamation, <br /> RNQiV Miningand Safety <br /> Department of Natural Resources <br /> 1313 Sheirman Stireet, 11llooirn 215 <br /> IC;einveir, CO0203 <br /> January 26, 2021 <br /> Kirk Daehling <br /> Natural Soda LLC <br /> 3200 CR 31 <br /> Rifle, CO 81650 <br /> RE: Nahcolite Project, File No. M-1983-194, Technical Revision(TR-45)Adequacy Review <br /> Dear Mr. Daehling: <br /> On January 19, 2021, the Division of Reclamation, Mining and Safety (Division) received your Technical <br /> Revision request TR-45 for the Nahcolite Project, Permit No. M-1983-194. The revision cannot be filed until <br /> the required revision fee is received. The revision requested addresses the following items: <br /> Addition of BG-11 to replace B-Goove wells BG-5 and BG-9 <br /> During review of the material submitted, the Division determined that the following issue(s) of concern <br /> need to be adequately addressed before the Technical Revision can be considered. Please provide the <br /> following: <br /> What is the estimated rate of transport for the elevated constituents seen in BG-5 and BG-9? <br /> Similarly what is the anticipated time frame to see a potential plume effect in the proposed BG-11 <br /> well? <br /> Natural Soda LLC needs to make a commitment to conduct monthly groundwater samples and <br /> provide those results to the Division for all groundwater monitoring wells that have issues or those <br /> wells that have been recompleted to a different zone than initially drilled which have a potential for <br /> communication issues. <br /> Please submit your response(s) to the above listed issue(s) as soon as possible. Once a revision fee is <br /> received by the Division a decision date will be set. <br /> If you require additional information, or have questions or concerns, please feel free to contact me. Amy <br /> Yeldell at the Division of Reclamation, Mining and Safety, 1313 Sherman St., Room 215, Denver,CO 80203. <br /> Direct contact can be made by phone at 303-866-3567 Ext 8183 or via email at amy.yeldell@ state.co.us <br /> 1313 Sherman Street, Room 215, Denver, CO 80203 P 303.866.3567 F 303.832.8106 https://mining.state.co.us <br /> Jared S. Polis, Governor I Dan Gibbs, Executive Director I Virginia Brannon, Director <br />