Archived
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Location
Lexington, Kentucky
Start Date
6-5-2026 11:30 AM
End Date
6-5-2026 12:00 PM
Description
This project consists of the ongoing capping of two, 200-acre, coal combustion residual (CCR) landfills with geosynthetic capping systems consisting of 15 to 24 inches of final cover soil over eight ounce per square yard filter/separation geotextile over Super Gripnet geomembrane with drainage studs along top and friction spikes along the bottom over a prepared subgrade consisting of in-place cover soil. Approximately 80 acres were capped at each landfill from 2023 to 2025. To comply with Title 25, Pennsylvania Code §288.234(d), requiring closure within one year after cessation of waste placement, approximately 30 acres of each 200-acre site must be capped yearly in anticipation that the Stations will cease coal combustion and residual waste disposal in the next 10 years. This presentation will review the cap system alternatives investigated, cap system selection per site conditions, cap system design, permitting, pre-construction test pads for rock sizes above and below cap system geosynthetics, construction issues and mitigation solutions, stormwater control during construction, and termination details along both the toe of the landfill and adjacent future capping phases as well as permit revisions to reduce cover soil thickness along benches and slopes. Discussion will include lessons learned during the first three years of caping and recommendations implemented to improve future capping construction.
Document Type
Presentation
Archival?
Archival
Included in
Energy Systems Commons, Environmental Indicators and Impact Assessment Commons, Environmental Monitoring Commons, Mining Engineering Commons, Oil, Gas, and Energy Commons, Structural Materials Commons, Sustainability Commons
Capping and Closure of Two Pennsylvania CCR Landfills: Progress Update and Key Insights
Lexington, Kentucky
This project consists of the ongoing capping of two, 200-acre, coal combustion residual (CCR) landfills with geosynthetic capping systems consisting of 15 to 24 inches of final cover soil over eight ounce per square yard filter/separation geotextile over Super Gripnet geomembrane with drainage studs along top and friction spikes along the bottom over a prepared subgrade consisting of in-place cover soil. Approximately 80 acres were capped at each landfill from 2023 to 2025. To comply with Title 25, Pennsylvania Code §288.234(d), requiring closure within one year after cessation of waste placement, approximately 30 acres of each 200-acre site must be capped yearly in anticipation that the Stations will cease coal combustion and residual waste disposal in the next 10 years. This presentation will review the cap system alternatives investigated, cap system selection per site conditions, cap system design, permitting, pre-construction test pads for rock sizes above and below cap system geosynthetics, construction issues and mitigation solutions, stormwater control during construction, and termination details along both the toe of the landfill and adjacent future capping phases as well as permit revisions to reduce cover soil thickness along benches and slopes. Discussion will include lessons learned during the first three years of caping and recommendations implemented to improve future capping construction.
