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5TATE OF COLORADO <br />DIVISION OF RECLAMATION, MINING AND SAFETY <br />Department of Natural Resources <br />1313 Sherman St., Room 215 <br />Denver, Colorado 80203 <br />Phone: (303) 866-3567 <br />FAX: (303) 832-8106 <br />March 17, 2010 <br />Mr. Bob Warneke <br />Natural Soda, Inc.V' <br />3200 RBC Road 31 <br />Rifle, CO 81650 <br />Re: Natural Soda, Inc., Nacholite Project, "mit <br />Technical Revision No. 29 application, TR-29. <br />Dear Mr. Warneke, <br />BONED <br />LIAR e 2 2010 <br />DiviWn of r;t cl,21`11ation, <br />Mining and Safety, <br />COLORADO <br />D I V IS I ON OF <br />RECLAMATION <br />MINING <br />SAFETY <br />Bill Ritter, Jr. <br />Governor <br />Harris D. Sherman <br />Executive Director <br />Ronald W. Cattany <br />Division Director <br />Natural Resource Trustee <br />NO.M-1983-194, Preliminary Adequacy Review of <br />The Division of Reclamation, Mining and Safety (DBMS) has reviewed the application for a technical revision to <br />the above referenced 112 permit. The purpose of the technical revision is to drill an experimental deep vertical <br />production well. A review of the application has revealed a couple of issues and clarifications to address. <br />1) Please specify what the proposed operating temperatures expected inside of the Experimental Deep <br />Vertical Production Well. Specifically, are the temperatures expected to be capable of pyrolisis of the <br />marlstone adjacent and in contact to the proposed well? <br />2) Please describe what the expected time frame from start of well drilling to completion. <br />The technical revision cannot be approved until the issues are adequately addressed. Please submit a response to <br />the issues as soon as possible but no later than March 22, 2010, so the decision date of March 24, 2010 can be <br />met. If your response, or a written request for an extension of the decision date, is not received by March 22, 2010 <br />then the request for the revision may be denied. <br />If you need additional information, please contact me at the Division of Reclamation, Mining and Safety, Grand <br />Junction Field Office, 101 S. 3rd St., Suite 301, Grand Junction, Colorado 81501, telephone no. 970.241.2042. <br />Sincerely, <br />4 <br />Travis Marshall <br />Environmental Protection Specialist <br />Cc: Paul Daggett, BLM White River Field Office <br />Jerry Daub, Daub and Associates, Inc. <br />Office of <br />Office of Active and Inactive Mines <br />Mined Land Reclamation Denver • Grand Junction • Durango