Coal Ash Overfill System

Coal Ash Overfill System

One benefit of the new EPA rules is the option to design a surface impoundment closure by executing an overfill, or in other words, constructing a new landfill over a closed surface impoundment.

Overfill Application

Overfills must comply with both the requirements applicable to the closure of surface impoundments or landfills, and with all of the requrements applicable to new landfills. The existing CCR surface impoundment must first be dewatered, capped, and completely closed to create a stable structural support to the liner system for the new landfill.

Geogrids Maximize Storage Volume and Minimize Stress on the New Liner

• Incorporated into the initial phase of impoundment closure, geogrids stabillize the waste mass and provide the strength and structural support required for the new liner system of the overfill.
• Geogrid reinforced berms eliminate long back slopes to allow near vertical expansion within a footprint similar to the original impoundment.

GSE Coal Ash Overfill System