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March 5, 2004 Mr. Ken Phillips NATURAL SODA, INC. 3200 County Rd. 31 Riiie, Colorado 81650 Faxed and mailed 3-5-04 U.S. Environmental Protection Agency Region VIII, Mail Code 8ENF-T 999 18a' Street -Suite 300 Denver, Colorado 80202-2466 f1 -~3-J Phone: (970) 878-3674 Fax: (970) 878-5866 RECEI!/ED MAR 0 8 2004 Division of Minerals & Deolopy Subject: Notification Required by Part II, B. Corrective Action; at Natural Soda Inc; UIC Class III Permit #C030358-00000; Rio Blanco County Dear Mr. Phillips: Enclosed please fmd NSI's review of all wells listed in Tables 2 & 3 of the Final UIC Permit, per corrective action required on page 12. First, attached is a summary table which "identifies into which mining cavities each well is completed". The attached table utilizes the most current status listed on Table 1, page 2 of the 2-19-04 permit modification. This includes all injection/recovery and subsidence wells. Monitoring wells aze not completed into cavities and monitor multiple cavities, Second, attached are well schematic or diagrams (38) for each well listed on Tables 2 and 3 of pages 12 and 13 of the permit as required. Please note the following abbreviations: MD =measured depth, Prod =production, ESP =electric submersible pump and BOM = bottom of motor. Third requirement of the permit is to make recommendations for addressing the repair and use of any wells not properly cemented or completed as required by Part II (A) (2) of the permit regazding "details of the solution mining injection wells". Although the focus is on injection wells, NSI has reviewed all wells. Infection Wells- All injection wells (4-3H, 4A-4V, 3A-4H, lA-4HI, SH, 6H, 2B-3C) have cement to surface and meet all requirements for Part II (A) (2} of the permit. Initial injection wells 90-SH, 91-2H and 93-4H, which had minimal cement and did not meet Part II (A) (2), have been plugged and abandoned. We112B-3C has been scheduled for plugging and abandonment (P&A) in 2004 or 2005. /V~"