...This report provides the results of investigation of the occurrence of trace metals and in a coal ash sample we received from the Punta Catalina power station, also known as the Hatillo power station, is a 752-megawatt (MW) coal-fired power plant in Punta Catalina-Hatillo, Azua, Dominican Republic. We conducted systematic leaching experiments of the coal ash sample following the United States Environmental Protection Agency’s (U.S. EPA) integrated leaching evaluation system, known as Leaching Environmental Assessment Framework (LEAF)... By conducting the U.S. EPA LEAF leaching experiments on a single coal ash sample from the Punta Catalina power station in Dominican Republic, the current study presents a systematic characterization and evaluation of the occurrence of metals and leaching characteristics of a suite of trace elements under various pH conditions and liquid to solid ratios, as compared with the one U.S. fly ash samples. The concentrations of toxic elements such as As, Se, Mo, Sb, and Tl in the investigated coal ash sample are significantly higher than those in common soil as we compared the new data to the average metal concentration of North Carolina soils. The data show relatively lower concentration of metals in the coal ash sample as compared to the U.S. fly ash and therefore, the majority of trace elements exhibit different leaching trends for the DO ash than the U.S fly ash over the range of initial leaching pH values and L/S ratios. Nonetheless Nonetheless, the concentrations of certain toxic heavy metals in the leachates including Mo, Se, Li, Tl, Ba, and Pb exceed some of the drinking water and ecological thresholds values of the World Health Organization (WHO), the U.S. EPA Maximum Drinking Water Level (MCL), and the U.S. EPA National Recommended Aquatic Life Criteria for chronic exposure (CCC). Therefore, uncontrolled management and release of the coal ash from Punta Catalina plant to the environment and water resources poses high environmental and human health risks...