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°' '`~ y~ `~Y'S ~RECEIVE® SEP 2 0 2~4 September 17, 2004 Mr. Ken Phillips NATURAL SODA, INC. Z~ 3200 County Rd. 31 Phone: (970) 878-3674 Rifle, Colorado 81650 Fax: (970) 878-5866 U.S. Environmental Protection Agency Region VIII, Mail Code 8ENF-T 999 18th Street, Suite 300 Denver, Colorado 80202-2466 Subject: Request for Permit Modification UIC Permit # CO 3358-00000 Deaz Mr. Phillips: Division of Minerals and Geology In the March 5, 2004 Natural Soda, Inc. letter to you, the project discussed plans for all NSI wells. In that letter, well 88-1 was proposed as a subsidence monitoring well and 2A-2V was proposed for re-completion as a second raw water well. With the 1994 approval of 88-1 as a subsidence monitoring well and the radioactive bullets in place (see attached well diagram), NSI requests that 88-1 be classified as a subsidence monitoring well. As a result of EPA and BLM approval, NSI is in the process of converting well 2A- 2V to a raw water source (see EPA approval, dated June 30, 2004). Prior to using the raw water from 2A-2V, an approved well permit will be received from the State Engineer's Office. In addition, a third well (4A-2V) listed for corrective action should be modified from shut-into not active or not completed (see attached diagram). Vertical well, 4A-2V, was drilled, cased and annulus cemented to surface. The horizontal completion well 4-3H never was drilled to complete 4A-2V as a production well, therefore it is not a production well requiring P/A. All aquifers are isolated and until a horizontal well makes connection there is no potential mining. During your site visit on July 26, 2004, you stated that Natural Soda should request a permit modification for 88-1 to be used as a subsidence monitoring well, 2A-2V for use as a second raw water well and 4A-2 V's change in status. NSI requests that the UIC Permit reflect the above uses.