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Management of coal mining and coal processing wastes,particularly of high sulfur coals,can generate excessive amounts of sulfate (SO42-) and chloride (Cl-) in mine drainage that are known to negatively impact quality of both surface and ground water.The U.S.Environmental Protection Agency provides guidance to states on allowable SO42-and Cl-discharges from mine sites.This research evaluates the hypothesis that co-disposal of CCPW and FCPW with appropriate compaction can result in improved geochemical and geotechnical environments that will minimize acid mine drainage formation and SO42-and Cl-discharges.Addition of ground limestone (ag-lime) to the mix was also evaluated as a drying agent and for improvement in overall geochemistry by buffering higher pH values within the coal waste.These objectives were to develop and implement innovative concepts for engineered co-management of CCPW and FCPW at coal mining sites.The authors performed long-term field column leaching studies to analyze improvement in SO42-and Cl-in water quality.Requirements for stricter standards in some states led to the need for development of potentially improved environmental practices.This paper presents the overall encouraging results of the field kinetic studies.