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<br /> <br />June 30, 2005 <br />NATURAL SODA, INC. <br />3200 County Rd. 31 <br />Rifle, Colorado 81650 <br />RE~+~iV~®/ <br />JUL 0 5 2005 <br />Division of Minerals and Geologg <br />M-1983-i9g <br />Phone: (970)878-3674 <br />Fax: (970) 878-5866 <br />~rs,cd~1 <br />Mr. Kent Walter, Area Manager Mr. Ken Phillips, Ground Water Specialist <br />Bureau of Land Management US Environmental Protection Agency <br />73544 Highway 64 Mail Code BENF-T <br />Meeker, CO 81641 999 18~` Street, Suite 300 <br />Denver, CO 80202-2466 <br />Subject: Submittal of Temperature and CCL Logs for Subsidence Monitoring <br />Wells 3M-TDR, 94-1M and 88-1; Natural Soda, Inc.; CO 3358-0000; <br />Rio Blanco County, Colorado <br />Dear Mr. Walter and Mr. Phillips: <br />Enclosed please fmd recent temperature and CCL logs, activity summary sheets <br />and well diagrams for subsidence monitoring wells. <br />Well 3M-TDR was bailed-out from 1776 FFS and logging was successful to 1814 <br />FFS near top of cement at 1820 FFS. The log from 6-24-OS indicates the casing <br />collars are still intact and no ground movement is indicated. A copy of a baseline <br />CCL from 11-07-03 is attached for comparison. The other interesting observation <br />is the continued decline in temperature as a result of successful cementing of 3M- <br />TDR. The temperature has declined from 220 F (11-07-OS) to 158 F per recent <br />log which is enclosed. <br />Well 94-1M was logged for temperature and CCL. Collars were intact and no <br />indication of ground movement was indicated. Logging was limited to 1828 FFS. <br />A bailer was utilized to clean-out the hole to 1876 FFS. During the next logging, <br />we plan to utilize hot water to try to clean bottom and extending the logging <br />interval. Bottom hole temperature was elevated at 108 F, a residual effect of <br />mining cavity #3. <br />