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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 requirements 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.

overfill illustration

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 

coaldrainGSE CoalDrain Geocomposite

GSE CoalDrain replaces the filter layer and the leachate collection layer in a typical Subtitle D liner system. It uses a highly engineered geotextile that has been developed specifically for CCRs. The filter and drainage performance of GSE CoalDrain has been verified through laboratory and field testing. 

LLLGSE Leak Location Liner

This high performance, coextruded HDPE geomembrane is specifically designed for use in the most stringent applications. This product has a UV-stabilized upper white surface that reflects light, enables damage detection and reduces wrinkles and subgrade desiccation. The electrically conductive bottom layer makes it easy to test for leaks in a safe, effective, and cost-efficient manner.

Bentoliner CARGSE BentoLiner Coal Ash Resistant GCL

BentoLiner CAR geosynthetic clay liner combines geosynthetics with sodium bentonite clay to form a highly impermeable barrier that often replaces thick layers of expensive compacted clay liners. GSE has added polymer-enhnaced sodium bentonite clay to our standard GCL to provide superior coal ash resistance.  

GSE geogridsGSE Geogrids

GSE Geogrids are reinforcement and stabilization products manufactured from HDPE or PP resin. They prevent slope failure and increase stability in applications where the soil is too weak to support heavy loads.

About GSE

GSE is a leading manufacturer and marketer of geosynthetic lining products and services. We've built a reputation of reliability through our dedication to providing consistency of product, price and protection to our global customers.

Our commitment to innovation, our focus on quality and our industry expertise allow us the flexibility to collaborate with our clients to develop a custom, purpose-fit solution.