The set contains the report that summarizes the results of five other reports that compile extensive reviews of available literature and data on municipal waste combustion (MWC) ash and leachate. In addition, the report provides chemical characterization data on MWC ash and simulated leachates as well as data on chemical parameters of actual leachate collected from municipal waste landfills, monofills, and co-disposal sites. The report includes the results of these analyses and a limited number of conclusions and recommendations for future actions. The Agency intends to utilize the document in the development of a viable ash management strategy. The set also contains the additional six support volumes to the report.