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REPORT <br />DESIGN RECOMMENDATIONS <br />INITIAL WASTE ROCK PILE <br />MT. GUNNISON COAL MINE <br />SOMERSET, COLORADO <br />FOR ARCO COAL COMPANY <br />1.0 INTRODUCTION <br />1.1 GENERAL <br />GEO-HYDRO Consulting, Inc., has previously performed a preliminary (Phase <br />I) design evaluation for the initial waste rock pile of ARCO Coal Company's Mt. <br />Gunnison mine. The results of this evaluation were presented in our report <br />titled "Report, Preliminary Design Recommendations, Initial Waste Rock Pile, Mt. <br />Gunnison Coal Mine, Somerset, Colorado, for ARCO Coal Company" dated March, <br />1981. The concepts of that preliminary evaluation were tentatively accepted by <br />representatives of the Colorado Mined Land Reclamation Board (CMLRB), subject to <br />implementation of recommendations in the report, and completion of Phase II of <br />the investigation, at a meeting in ARCO's offices in April 1981. The recommenda- <br />tions of the design evaluation are addressed in this current (Phase II) report. <br />I1.2 SCOPE <br />This investigation was originally authorized in your service agreement for <br />ithe scope of work outlined in your "Geotechnical and Hydrological Engineering, <br />Scope of Work and Specifications for Upper and Lower Rock Waste Piles, Mt. <br />Gunnison Mine, Phase 2-Hydrological and Geotechnical Studies" dated 23 March, <br />1981. The scope of work was further refined during our preliminary design <br />evaluation as presented in the section entitled "Future Studies Required" in <br />that report. <br />~EOHVnco conaunnc n+c <br />