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<br />Richartl D. Lemm <br />Governor <br />DEPARTMENT OF NATURAL RESOURCES <br />David H. Getches, Executive Director <br />MINED LAND RECLAMATION DI\ <br />DAVID C. SHELTON, Director <br />April 17, 1984 <br />Mr. Scott Jones <br />Snowmass Coal Company <br />P.O. Box 980 <br />Carbondale, Colorado 81623 <br />Re: Stipulations and Commitments to N. Thompson Creek Mine, Permit No. <br />C-025-81 <br />Dear Mr. Jones: <br />The Division has completed its review of your response to Stipulation No. 1, <br />your subsidence report format, as built designs, Canadian Thistle control <br />plan, and quarterly hydrologic monitoring results. The following are the <br />results of our review: <br />Stipuiation No. 1 of the N. Thompson Creek Permit reads as follows: <br />Stipulation No. 1 <br />WITHIN ONE HUNDRED AND TWENTY (120) DAYS OF PERMIT ISSUANCE, SNOWMASS <br />COAL COMPANY SHALL INSTALL ADDITIONAL MONITORING WELLS TO MONITOR THE <br />UPPER SANDSTONE OF THE WILLIAMS FORK FORMATION. THESE MONITORING WELLS <br />MAY BE DRILLED WITHIN THE N0. 3 MINE TO REDUCE DRILLING COSTS. ALL <br />MONITORING WELLS SHALL BE: 1) PROPERLY SCREENED WITHIN THE ENTIRE <br />SANDSTONE UNIT, AND 2) PROPERLY SEALED AT THE TOP AND BOTTOM TO PREVENT <br />THEIR DESTRUCTION. THE SPACING OF THE ADDITIONAL MONITORING WELLS SHALL <br />BE SUBMITTED TO THE DIVISION FOR APPROVAL 60 DAYS FOLLOWING ISSUANCE OF <br />THIS PERMIT. <br />The Division reviewed the new piezometric map developed from the new well <br />data. The map format was good. I liked the idea of superimposing the <br />topography over the mine workings. The map verifies your earlier prediction <br />of a near linear piezometric contour between wells PZ-l, 3, 2, and 4. <br />Accordingly, Stipulation No. 1 is hereby resolved and the new piezometric map <br />satisfied your commitment made in the application. <br />Jim Pendelton of our staff reviewed your subsidence report format. He has <br />recommended approval of the report format under the condition that a <br />subsidence map accompany the report submittal. Unless you disagree with this <br />condition the Division considers this item resolved. <br />423 Centennial Building, 1313 Sherman Street Denver, Colorado 80203 Tel. (30'x) 866-3567 <br />9 <br />