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Literature dealing with runoff from coal storage facilities is scarce and poorly documented. Most of the data reported are derived from the analysis of single grab samples taken from leaching experiments or from onsite sampling during rainfall events. There have been few investigations of the long‐term environmental effects of coal pile leachate with the emphasis on changing water quality. This review identifies potential water quality issues and discusses coal storage conditions that intensify the acid drainage problem. Future research is needed in the development of a standardized laboratory leaching test, in the identification of organic compounds in the leachate, in the treatment of leachates, and in the development and verification of predictive models. These new areas of research should build on the existing literature to define a comprehensive waste management strategy providing for an environmentally acceptable method of onsite storage of large quantities of coal.

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This report was prepared as an account of work sponsored by an agency of the United States Government. Neither the United States Government nor any agency thereof, nor any of their employees, contractors, subcontractors, or their employees, makes any warranty, express or implied, nor assumes any legal liability or responsibility for any third party's use or the results of such use of any information, apparatus, product or process disclosed in thi& roport, nor represents that its use by such thin.l IJ