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<br />March 28, 2005 <br />NATURAL SODA, INC. <br />3200 County Rd. 31 <br />Rifle. Colorado 81650 <br />Mr. Kent Walter, Area Manager <br /> <br />Phone: (970) 878-3674 <br />Fax: (970) 878-5866 <br />REC~~If <br />White River Resource Area <br />Bureau of Land Management MAR 2 9 yD05 <br />73544 Highway 64 Division of Minerals and Geology <br />Meeker, CO 81641 ./~ <br />Q Ld L~ -~A !'p ~ <br />Miq 3-19y N ~ / P ~f <br />Subject: Sundry Notice for Modification of Proposed 7H-2I Drilling Distance <br />Dear Mr. Walter: <br />Enclosed please find Sundry Notice (two copies) for proposed production wets 7H- <br />2I. The enclosed Sundry Notice is to document and inform the BLM that Natural <br />Soda, Inc. requests a change in the drilling plans to reduce the length of the bore <br />hole for 7H-ZI. The purpose of this modification is to ensure 7H cavity is separated <br />from lA cavity, thereby avoiding potential sodium chloride contamination and <br />temperature loss. The BLM has directed that future cavities be separate units. The <br />EPA specified as a condition of approval in the "Authorization to Commence <br />Injection" for Well 6H that "further solution mining of Panel 2 will be limited to <br />paired injection and recovery well schemes." The BLM and EPA directives require <br />that 7H be positioned to remain isolated from existing cavity lA. <br />Based on the premise of having independent cavities, a recommendation from <br />Agapito Associates, Inc. was developed for drilling the 7H-2I bore hole. Attached <br />is a copy of the Agapito recommendation. To ensure that 7H is separate from lA, <br />7H-2I drill hole will terminate 251 feet from the center line of lA-4HI drill hole. In <br />summary, a rectangular model estimate of cavity radius was 1005 feet; utilizing <br />worst case basis (triangular cavity cross section), a width two times greater than the <br />rectangular cross section was utilized. This results in a radius of 201 feet for lA. <br />NSI projects the injection point will mine 30 feet up-dip along the strike of the well <br />bore. To be conservative Agapito suggested the use of 50 foot for cavity growth. <br />Therefore, a total of 251 feet is proposed between 7H-2I termination point and lA- <br />4HIbore hole. <br />G'rS-~ Ctl~o, ~ry <br />