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~ /'~~ ~`' f icy NATURAL SODA, INC. 3200 County Rd. 31 Phone: (970) 878-3674 Rifle, Colorado 81650 Fax: (970) 878-5866 September 30, 2004 RECE9VE~ Mr. Gregg Squire OCT 0 4 2004 Division of Minerals and Geology Department of Natural Resources Division of ..^.";k.aals & Geoi,_ 1313 Sherman Street, Room 215 Denver, CO 80203 Subject: Sundry Notice and Follow-up Temperature and Gamma Ra Lo Resr ul_ is for Subsidence Monitoring We113M-TDR Dear Mr. Squire, Backeround: Subsidence monitoring well 3M-TDR was drilled and cemented in September-October of 2003. As a result of inadequate cement, flow down the annulus was noted by temperature logs and tracer test. Additional cement work was performed in April 2004. NSI observed positive results of the cement job, on the mining injection/recovery flows. Logging of the 3M-TDR well was performed in May 2004 and confinued positive results of cement jobs. Fill material from cementing, limited logging to above 1630 FFS. May 2004 temperature and CBL logs indicate 3M-TDR had been successfully cemented and the Dissolution Surface, B-Crroove, A-Groove and Perched aquifers have been isolated in 3M-TDR. NSI made commitment in May 12, 2004 letter to regulatory agencies to clean-out the lower portion of 3M-TDR and obtain more complete logs during the Fall P/A activity. This letter was prepared to update regulatory agencies on the recent logging of 3M- TDR, after drilling out bottom section of 3M-TDR- Contractor drilled out five foot bridge at 1650', and ran bit to 1824' (solid cement). Logging was performed to 1786' where debris limited further logging. Due to perforation at 1650', NSI could not circulate and clean-out bottom of hole. NSI will use a bailer to clean-0ut remainder of casing to solid cement. Tagging the cement at 1824' and the presents of debris indicates the bottom of the well is intact. See attached Sundry Notice and well work summary.