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GSE supplied approximately 1,000,000 square feet of our innovative GSE Bentoliner CAR (Coal Ash Resistant) Geosynthetic Clay Liner (GCL) to a 3,520-megawatt Southeastern United States for the containment of wet process ash. The owner insisted that no GCL additives used be toxic or enhance any microbial growth in the surrounding soils and water table.
Coal ash resistant GSE Bentoliner CAR was used as part of a composite liner system also comprised of 60 mil textured HDPE geomembrane and drainage geocomposite. Bentoliner CAR offered an ideal secondary component to a composite containment system with never-before-seen performance in the presence of coal ash leachate. The GCL offers optimal containment in comparison with a native clay layer.
It also offers a polymer enhanced bentonite formulation that affords outstanding performance under extreme conditions and chemical attack, such as those found in wet and dry coal ash storage impoundments. High ionic solutions containing elevated levels of calcium and sodium have historically been a “no-man’s land” for bentonite-based products. Now many of these environments that were once incompatible with a GCL can be managed with GSE Bentoliner CAR.
The owner wanted to construct an impoundment that would conform to any potential rulings from the EPA on coal ash management. Design engineers wanted to achieve the highest possible levels of containment with the greatest margins of safety. GSE Bentoliner CAR GCL addressed both of these needs.
GSE Bentoliner CAR