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it EXECUTIVE SUMMARY Western Research Institute (WRI) has been involved in the evaluation of ash management options for a number of years. Western Research Institute is proposing a three-year program under the sponsorship of the U.S. Department of Energy (DOE), Public Service Co. of Colorado, McDonald Farms Enterprises and Energy Research Center of Colorado State University to examine the use of ash in the production of a grout for injection into underground mines for subsidence control. The program will be conducted in two phases. Phase I will examine the environmental and geotechnical issues associated with ash-based grout injection into mines. This effort will determine the issues from the regulatory perspective and include a research program to address these issues. The testing will be conducted at the laboratory scale and is expected to last approximately six months. Phase II will involve the demonstration and monitoring of a full-scale test in the Shamrock Mine. This will include the permitting, the injection, and the monitoring of the geotechnical and environmental performance. The following tasks are proposed for the Phase I effort: Task I. Development of Experimental Plan Task II. Ash and Mine Water Acquisition and Characterization Studies Task III. Grout Mix Design Testing Task W. Laboratory-Scale Mine Emulation Tests Task V. Project Management and Reporting The estimated costs for the first year of the proposed program are $166,976. Public Service Co. of Colorado, McDonald Farms Enterprises, and the Engineering Research Center of Colorado State University will contribute $15,540 in cash and $68,000 in in-kind services. The U.S. Department of Energy (FETC) is being requested to match the co-sponsor funding in the amount of$83,436. The proposed work is a two-phase three-year effort to begin September 1, 1999. The Phase I effort proposed herein is scheduled for six months. iii