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Treating Surface Mine Spoil with Fluidized Bed Combustion Ash to Control Acid Mine Drainage Paul F. Ziemkiewicz 1 1 West & 8230; site& 8217;s NPDES permit is in compliance without treatment & 8230; The Office of Surface Mining& 8217;s Acid Mine Drainage Policy of 1998, proscribed permitting of mines with the prospect of indefinite generation of AMD. In 2002 Patriot Mining Co. began to develop Waynesburg reserves and sought a means of controlling AMD in compliance with the policy. The reserves were to serve a newly constructed fluidized bed & 8230;

Surface mining of the Waynesburg Coal seam in northern West Virginia has typically resulted in acid mine drainage (AMD) generation. The Office of Surface Mining& 8217;s Acid Mine Drainage Policy of 1998, proscribed permitting of mines with the prospect of indefinite generation of AMD. In 2002 Patriot Mining Co. began to develop Waynesburg reserves and sought a means of controlling AMD in compliance with the policy. The reserves were to serve a newly constructed fluidized bed combustion (FBC) plant in nearby Morgantown WV. The selected control method included complete mining of all coal and immediately adjacent carbonaceous shales for shipment to the FBC unit. This accounted for the bulk of pyritic material on site. FBC ash was then to be used as a compacted, cementitious barrier applied to the mined pit floor, against the highwall and as a compacted cap over the regraded spoil. The objective was to direct most water flow away from the regraded spoil to minimize AMD formation. Monitoring data are shown indicating that since treatment with the FBC cap, AMD has been controlled to the extent that the site& 8217;s NPDES permit is in compliance without treatment. The NPDES permit contaminants include Al, Fe, Mn and pH. Additional elemental monitoring required by the WV Department of Environmental Protection indicates that levels of As, Se, Ba, Cu, Pb, Ni and Hg are below drinking water or aquatic life standards as appropriate indicating that the benefits with respect to AMD remediation are not offset by the introduction of other contaminants.

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