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These ashes are products from PSCo facilities that have a potential for use in this application. Standard Characterization Representative samples of the ashes will be subjected to standard testing for chemical and physical properties. The chemical characterization of the ash consists of the chemical analysis for the elemental composition of the ash and the identification of the phases present in the ash. The phase analysis is typically performed by X-ray diffraction (XRD) methods, while the elemental composition of the ashes are determned according to standard American Society for Testing Materials (ASTM) methods, by inductively coupled plasma spectroscopy (ICPS), and by X-ray fluorescence spectrometry (XRF). The physical characterization includes bulk density, specific gravity, and particle size distribution (PSD) and will be conducted according to ASTM C-311 techniques. The leachate characteristics of the ash will be determined according to the EPA Toxic Characteristic Leaching Procedure (TCLP). However, based on the discussions to date with representatives of the regulatory community, additional testing employing other leaching techniques may be more appropriate and therefore required. Mine Water Characterization The mine water at the Shamrock Mine will be used in the testing. Sufficient quantities will be sampled and collected by McDonald Farms Enterprises personnel and provided to both WRI and the CSU Engineering Research Center. The Shamrock Mine water will be characterized for appropriate water quality parameters. Specialized Leaching Protocol of Grout Materials Grout materials from the Task IlI testing will be subjected to sequential column leaching tests. An understanding of the interaction between the fresh grout and the mine water and the interaction of the cured grout and mine influx water are considered essential to the regulatory needs. Column and three rolling extraction procedures are currently being considered. The selection of methodology will be made as a result of the Task I assessment. Task III. Mix Design Testing The present plan is to examine four ashes for use in designing four potential grouts. The ashes listed in Task H will be combined into the four grout mixes. The basic principles of the grout mix design are as follows: • Pumpable mixture with flow of about 8 in. (NRMA method) • Low dispersion when contacted with the mine water • Capable of curing in saturated conditions 4 I