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h May 2, 2003 NATURAL SODA, INC. ~ 3200 County Rd. 31 Rifle Colorado 51650 RECEIVED Phony, (970) S7S-3674 Pax: (970) S7S-5Fi66 MAY 0 5 2003 Mr. Paul Osborne Division ~f Minerals and Geobnl Mr. Carl B. Mount '~ Ground Water Program Senior Environ. Protection Specialist US EPA Region VIII, Mail Code 8P-W-GW Division of Minerals and Geology 999 18th Street, Suite 300 1313 Sherman Street, Room 215 Denver, Co 80202-2466 Denver, Colorado 80203 Subject: Completion Report for Subsidence We112M-TDR ~ Dear Mr. Osborne and Mr. Mount, Enclosed please find Completion Report for new subsidence well 2M-TDR, within ten-day limit following completion, Apri123, 2003. This report provides details of the drilling and completion per Mr. Steve Schram, Natural Soda, Inc. Drilling Engineer. A gamma ray log is enclosed for we112M-TDR. Also, enclosed is a letter dated May 1, 2003 from Mr. Jim Cremeens with Agapito Associated Inc.. Mr. Cremeens was a contractor for Natural Soda, Inc. to oversee TDR cable installation. There is some evidence that three of the cables were damaged during cement phase of the well completion. In summary, Mr. Cremeens stated "that there has not been enough time elapsed to post-process, nor interpret all the data. Similazly, the suggestion that cables 1, 2 and 4 have been compromised by water intrusion due to cable damage is no more than a preliminary suggestion. The data will be thoroughly scrutinized to determine the current state of expected performance from the TDR installations." Natural Soda will continue to have Agapito Associates, Inc. evaluate the status and future value of this well. If three of the cables are compromised, and just the TDR cable set 95 feet above the Dissolution Surface is working properly, Natural Soda will have to provide the regulatory agencies with a plan of how this well will meet monitoring requirements. The future use of multiple TDR cables in monitoring wells to evaluate mining effects will be reviewed and alternatives considered. Natural Soda will have to provide the regulatory agencies with a revised subsidence monitoring plan.