ENTACT successfully completed the closure of a 140-acre wet fly ash impoundment containing 13.4 million cubic yards of coal combustion residual (CCR). The project involved a comprehensive approach to manage surface water by pumping and utilizing temporary drainage channels in the deposited ash, directing it to a permitted outfall located behind the main dam. Notable scope items on this project completed by ENTACT:

• Lowered the main dam and removed the saddle dam
• Constructed a new spillway for both dams to enhance water management
• Drained surface water through pumping and temporary drainage channels
• Regraded exposed fly ash to ensure proper contouring
• Installed a multilayer capping system composed of geomembrane, geosynthetics, protective cover soil, and vegetation

Upon completion, ENTACT managed more than five million cubic yards of ash and soil, lined and capped the entire 140 acres, and pumped and managed more than seven billion gallons of water, ensuring a compliant and safe closure of the impoundment.