2008-04-22_PERMIT FILE - C1981017 (4)

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i,_ CONSTRUCTION PROCEDURES AND MODIFICATIONS COAL REFUSE DISPOSAL FACILITY AND ROCK TUNNEL WASTE DISPOSAL FACILITY COAL BASIN MINES, REDSTONE, COLORADO FOR MID-CONTINENT RESOURCES, INC. 1.0 INTRODUCTION • Mid-Continent Resources, Inc. (Mid-Continent) operates two disposal facilities at their property. The coal refuse disposal facility is located in the immediate vicinity of the wash plant. The operation of this facility is scheduled only for, a limited period of time as there is no substantial storage volume avail- able at the site. The second disposal facility serves for the deposition of the rock obtained during the excavation of the rock tunnel. The Mined Land Reclamation Divison (MLRD) directed Mid- Continent to determine whether the construction methods at both these disposal facilities comply with the previously established design criteria and to evaluate the necessary changes in the con- struction methods, if they do not comply with these criteria. Mid-Continent instructed Geo-Hydro Consulting, Inc. (Geo-Hydro) to perform the necessary work to comply with this requirement. 2.0 SCOPE OF WORK ~_ I r' .__ The scope of this study is to review all available material related to the construction of both disposal facilities, to review the stability analyses performed for both of them, con- struction procedures recommended in pertinent reports,_and to re- view pertaining regulations of the State of Colorado. A field inspection of both facilities and a limited program of field and laboratory testing were proposed to obtain addition- al data on the conditions of both facilities. Finally, based on this work, recommendations should be made on any construction modifications, if necessary. These recommendations should deal mostly with the problems of stability, final slopes, compaction and future monitoring at both waste piles. 14 ~ - .~.~'~ - ~- >, _ a:_.._ ._ ~. ~. . GEaMYD~O CONSUlT1NG, INC_.