Ash yard leachate is alkaline and carries trace metals — a standing inspection target. Large areas, high slopes and ash scour complicate lining, and retrofits must keep the plant running.
Coal Ash Yard Lining: Ash yards use 1.0-1.5mm HDPE (alkali-resistant, better than PVC) with 400-600 g/m² filament geotextile cushion; slopes switch to 1.5mm double-textured; perimeter intercepting ditches keep clean water out; crest anchor trenches and berms stabilize edges. Weld records and concealed-works sign-offs are mandatory inspection documents — build them in from day one, and phase construction around plant operation.
Ash yard leachate is alkaline and carries trace metals — a standing inspection target. Large areas, high slopes and ash scour complicate lining, and retrofits must keep the plant running.
| Location | Recommended material | Reason |
|---|---|---|
| Base liner | 1.0-1.5mm HDPE | Alkaline leachate resistance |
| Slope liner | 1.5mm double-textured | Steep faces |
| Cushion | 400-600 g/m² filament geotextile | Sharp ash particles |
| Drainage | Composite net or gravel blinds | Leachate & groundwater |
| Perimeter | Intercepting ditches | Keeps runoff out |
| Closure cap | 1.0mm HDPE + soil + vegetation | Decommissioned yards |
2022Phased retrofit around plant operation: 1.0-1.5mm HDPE over 400 g/m² filament geotextile, perimeter intercepting ditches, anchor trenches signed off as concealed works with complete photo records.
View project details ›Ash leachate is alkaline; HDPE resists alkali better than PVC-type films. 1.0-1.5mm base with textured slopes is standard.
Weld test records and concealed anchor-trench sign-offs — keep complete logs, reports and photos.
Phase by zone: idle/low-impact areas first, physical isolation from operating zones, drainage and interception built ahead.
Dezhou Yurun Geosynthetics Co., Ltd. is a source manufacturer of geosynthetic anti-seepage materials, located in the geosynthetic industrial cluster of Lingcheng District, Dezhou City, Shandong Province, China. We supply HDPE geomembrane, pond liners, composite geomembrane, filament and staple geotextile, tunnel waterproof board, composite drainage net, sodium bentonite GCL, ecological bags and cement blanket to projects across China and overseas.
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HDPE geomembrane · pond liner · composite geomembrane · geotextile · GCL · drainage net · geobag · cement blanket · tunnel board
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