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<br />White River <br />May 16, 1996 <br />III IIIIIIIIIIIII III <br />999 <br />Nancoi~ie Minerals ,•.,~,~ <br />MAl' 2 U 1996 <br />~,~,~:.~~: ~, ,,,:r,erais s ~,eoiogy <br />Mr. John Mehlhoff, Area Manager <br />White River Resource Area <br />Bureau of Land Management <br />P.O. Box 928 <br />Meeker, CO 81641 <br />Mr. John Carson <br />Environmental Protection Agency <br />Mail Code 8WM-DW/UIC <br />499 18th Street, Suite 500 <br />Denver, CO 80202-2466 <br />Subject: Submittal of Revised Monitoring Plan, for White River Nahcolite <br />Dear Mr. Mehlhoff and Mr. Catson: <br />Enclosed please fmd a. copy of the revised "Comprehensive Monitoring Plan for <br />Commercial-Scale Solution Mining of Nahcolite". The revision was prepared as <br />a result of the BLM mitigation stipulation dated March 8, 1996, when the new <br />Mine Plan was approved. <br />I have reviewed BLM and EPA approval action over the past four years and <br />updated the monitoring; plan to include those changes in this update. The <br />following portions of the monitoring plan were revised as follows: <br />Section I-Ground Wat<;r monitoring program was revised to include current <br />frequency of water level and quality measurements. Also continuous water level <br />measurement, and readout in the control room of the Dissolution Surface aquifer <br />has been added. <br />Section II-Surface Water Monitoring Plan required minor changes only. <br />Section III-Subsidence Monitoring Plan was revised to include new extensometer <br />well and updated per ]:1LM/EPA approvals over the past four years. <br />Section N-Production Weil Mechanical Integrity was updated to include annulus <br />pressure monitoring program, and other changes over the past four years. <br />Section V-Biology Monitoring was updated only in minor aspects to clarify <br />plan. <br />Whlte Rlvar Nahcollta Minerals. Limited Lleblllty Company <br />P. O. Drawer 72, 3200 Co. Rd. 31, Rille, CO 81650 (tel) 303-878-3674 (fax) 303-878-5666 <br />