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1985'/2 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 /> www.daubandassociates.com <br /> November 22, 2021 RECEIVED <br /> Division of Reclamation, Mining and Safety <br /> Attn: Minerals Division NOV 3 0 2021 <br /> 1313 Sherman Street, Room 215 <br /> Denver, CO 80203 Colorado Division of Redamalon, <br /> Mining and Safety <br /> Re: Natural Soda LLC (NS) Nahcolite Project Permit No. M-1983-194 Technical Revision, Updates to the NS <br /> Groundwater Sampling and Monitoring Program <br /> Natural Soda LLC hereby notifies the DRMS of updates to their groundwater sampling and monitoring program. <br /> These updates will add groundwater sampling and monitoring components for NS's newly constructed PA-1,AG-2, <br /> and BG-10 upgradient groundwater monitoring wells (GMWs). The groundwater monitoring program updates <br /> also take into account NS's extensive, forty years of historic and current sampling, monitoring, and aquifer <br /> characterization. The rationale for these changes was previously presented with our November 3, 2021 <br /> submission (Groundwater Monitor Well Sampling and Monitoring Schedule). Included in this TR submittal is the <br /> previously submitted text including a table highlighting the changes from the current monitoring program as <br /> requested in DRMS letter dated November 181h 2021. <br /> Please find attached: <br /> 1) DRMS Cover Sheet- Request for TR <br /> 2) Natural Soda Groundwater Monitor Well Sampling and Monitoring Schedule Modification Nahcolite <br /> Project Permit No. M-1983-194 DRMS TR No. 47 Submission containing Current vs Modified GMW <br /> Sampling and Monitoring Schedule table(with changes highlighted) <br /> 3) Check#7786 for the revision fee ($216.00) <br /> Should you have any questions or comments, please contact me at (970) 254-1224 or (970) 216-1010 (c), or Kirk <br /> Daehling at(970)456-1268. <br /> Regards, <br /> -/�11 -04V-10-7— <br /> Gerald J. Daub, PG, CPG <br /> President <br /> Daub&Associates, Inc. <br /> Cc: Kirk Daehling w/enc <br /> President <br /> Natural Soda LLC <br /> James Roberts w/enc <br /> Bureau of Land Management (WRFO) <br /> Amy Yeldell (via email) <br /> Colorado Division of Reclamation, Mining and Safety <br /> File <br /> SPECIALIZING IN PROFESSIONAL GEOLOGICAL, ENVIRONMENTAL, HYDROLOGICAL, GEOTECHNICAL AND PERMITTING SERVICES <br />