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1985 Yz SOUTH BROADWAY <br /> DAUB & ASSOCIATES, INC. GRAND JUNCTION, CO 81507-9649 <br /> _ (970)254-1224 <br /> FAX(970)242-8438 <br /> email: gjdaub@daubandassociates.com <br /> wwww.daubandassociates.com <br /> February 22, 2017 RECEIVED <br /> Mr. Kent Walter <br /> FF R 2 / 2017 <br /> Bureau of Land Management DIW F RECLAMATION <br /> 220 East Market Street MlNi rGAND SA,FETY <br /> Meeker, CO 81641 <br /> Re: Natural Soda LLC (NS) Notice of Intent to Plug and Abandon (P&A) the <br /> 13G-8 (DS-4) Monitor Well <br /> Dear Mr. Walter: <br /> NS proposes to plug and abandon the BG-8 (DS-4) monitor well, located on NS lease <br /> COC-0118327. NS has noted elevated values for select parameters in the BG-8 <br /> groundwater. NS believes that the anomalous BG-8 groundwater chemistry may be <br /> due to complications from the recent conversion from a DS Aquifer monitor well to a <br /> B-Groove Aquifer monitor well. <br /> NS has considered three potential fluid pathways which would cause the anomalous <br /> BG-8 groundwater data: <br /> • fluid movement through the BG-8 intermediate casing, <br /> • fluid movement through the BG-8 intermediate casing annulus, or <br /> • fluid movement through naturally occurring fractures. <br /> NS wishes to be proactive with this issue and therefore plans to P&A the BG-8 <br /> groundwater monitoring well. NS intends to ensure good annular cement in the BG-8 <br /> above and below the B-Groove and A-Groove Aquifers and will perforate and squeeze <br /> cement into the intermediate casing annulus, as necessary, to ensure good annular <br /> cement and zonal isolation. The intermediate casing will then be filled with cement from <br /> below the B-Groove Aquifer to surface. Please refer to the enclosed P&A Prognosis for <br /> additional details. <br /> Should you have any questions or comments, please contact me at (970) 254-1224 or <br /> (970) 216-1010 (c), or Kirk Daehling at (970) 878-3674 ext. 114. <br /> Regards, <br /> Gerald J. Daub, P.G., C.P.G. <br /> President <br /> Daub & Associates, Inc. <br /> SPECIALIZING IN PROFESSIONAL GEOLOGICAL, ENVIRONMENTAL, HYDROLOGICAL,GEOTECHNICAL AND PERMITTING SERVICES <br />