Owner/Client
Ohio Power Company (AEP)
Location
Cresap, WV
CEC Services
- NPDES and PTI Permitting
- Landfill Design
- Ecological Studies
- Archaeological Studies
- Clean Water Act Permitting
- Waste Characterization
- Stream Mitigation
- Leachate Force Main Design
- Haul Road Design
- Hydrologic and Hydraulic Analyses
- Geotechnical Engineering & Slope Stability Analysis
- Seepage Analysis
- Cost Estimates and Construction Administration
- Aggressive Schedule
Owner Objective
The Ohio Power Company needed to develop a landfill facility that would accept flyash produced at its Mitchell Power Plant in Marshall County, West Virginia. The landfill site is a deeply-incised, steeply-sloped valley situated above an abandoned underground coal mine and adjacent to a large impoundment for coal combustion by-products (CCB) and coal mine refuse.
CEC Approach
CEC performed preliminary engineering design which included several conceptual design options, each of which evaluated airspace, anticipated life, lined area, and soil balance. The selected landfill design included an impermeable composite liner system comprised of a geosynthetic clay liner (GCL) overlain by a PVC membrane; a groundwater interceptor drainage system; a leachate collection and conveyance system; a lined leachate storage basin; storm water collection and conveyance systems, including three stormwater management/sediment control basins; a compacted clay cover system; and associated haul roads, stockpile areas and operational facilities.
CEC staff also coordinated, managed and performed hydrogeologic and geotechnical subsurface investigations, cultural resource studies, stream and wetland delineations, endangered species evaluations, groundwater sampling, site survey, and laboratory testing programs in support of EPA permit requirements for construction of a landfill. For the EPA Solid Waste permitting, CEC prepared engineering design drawings and the accompanying Class F Industrial Landfill Facility Solid Waste Permit Application narratives, including a Hydrogeologic Subsurface Report, Mine Subsidence Report, Operating Record, Groundwater Monitoring Plan, Groundwater Protection Plan, Erosion and Sediment Control Plan, and Construction Quality Assurance Plan. With respect to the Individual Clean Water Act (CWA) Section 401/404 Permit Application, CEC conducted jurisdictional waters delineations, stream quality assessment surveys, stream mitigation plan preparation, Endangered Species Act compliance services (including Indiana bat mist net surveys and habitat assessment surveys), and associated agency coordination activities. CEC utilized the West Virginia Stream and Wetland Valuation Metric protocol to determine stream and wetland impact debits associated with construction of the landfill, and stream mitigation credits for activities identified in the prepared mitigation plan. CEC also prepared construction drawings and technical specification for the landfill phases.
The new 100-acre landfill facility contains a 58-acre waste footprint facility that has the capacity to store 10 million cubic yards of CCB, providing 24 years of CCB disposal life for the Mitchell Power Plant.
