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1 <br />f <br />4 <br />Richard D. Lamm <br />Governor <br />DEPARTMENT OF NATURAL RESOURCES <br />David H. Getches. Executive Director <br />MINED LAND RECLAMATION DIVISION <br />DAVID C. SHELTO N, Dlreetor <br />DATE: February 8, 1984 <br />T0: Bob Liddle `> <br />~ 1, •_~~ <br />FROM: Jim Pendleton --• <br />RE: "Evaluation .6i` Stab' ty Monitoring <br />Orchard Val ne Cuts and Fills <br />for Colorado Westmoreland, Inc." <br />Pursuant to your request, I have reviewed the above referenced report, <br />submitted by Colorado Westmoreland, Inc. The report was prepared by <br />Geo-Hydro Consulting, Inc., consultant to the operator. This report <br />presents the results of one year's monitoring of inclinometers and <br />piezometers installed near various fills and cuts at the Orchard Ualley <br />Mine surface facilities. The purpose of these installations was to <br />verify projections and assumptions made in analyzing the existing <br />operational and proposed reclamation configurations for the surface <br />facilities area at the Orchard Valley Mine. <br />In brief, the past year's slope stability monitoring does verify the <br />assumptions and projections made by the consultant to date. Certain <br />of the fills at the mine site are demonstrating minor consolidation and <br />shear-related downslope movement. The observed movements are <br />complementary with the earlier assumptions and projections. <br />Last fall Colorado Westmoreland, Inc. submitted a report prepared by <br />Geo-Hydro Consultants, Inc., in response to Stipulation No. 23 placed <br />upon their coal mine permit No. C-038-83. Stipulation No. 23 required <br />the analysis and redesign of the proposed post-mining configuration for <br />the surface facilities area of the Orchard Valley Mine. Stipulations of <br />permit C-038-83 referred to a three-phase analysis and redesign program <br />for the surface facility reclaimed configuration. This report satisfies <br />one of the review conditions presented in my memo to you of November 29, 1983. <br />In that mono I observed; <br />423 Centennial Building, 1313 Sherman Street Denver, Colorado 80203 Tel. (303) 866-3567 <br />III III III III IIII III ' , <br />