Case Studies

Fully Lined Structural Fill at Asheville Regional Airport

Charah is one of the largest providers of coal combustion product management and power plant support services for the coal-fired electric utility industry. Charah has been operating in North Carolina since 2001. The company uses the best practices, materials and technology for structural fills and is nearing completion of a coal ash structural fill project at Asheville (North Carolina) Regional Airport. Read more »

Ash Basin Cleanup, Lining & Service

Charah was hired to excavate, reconstruct and improve standards of an operating ash basin while ensuring that plant operations were not impacted. Specifically, that included a complete excavation of the basin and construction of a liner system that is in compliance with engineering standards and local, state and pending U.S. Environmental Protection Agency (EPA) regulations. Read more »

Ash Pond Cleanup

Anticipating that future EPA regulations may mandate the closure of Coal Combustion Residual (CCR) ash ponds, the utility sought proposals for cleaning and pre-closing preparation of the ash pond serving one of its power plants. In addition to meeting current regulatory standards, the utility wanted to maximize available pond storage for future use. Read more »

IGCC Slag Beneficiation

A utility’s advanced technology power plant byproducts were originally expected to be directly suitable for use in various industry applications. However, upon plant startup, the large quantity of char mixed with the slag made the process byproducts unsuitable for beneficial use. As an interim solution, the slag and remaining carbon byproduct was trucked to a traditional pulverized coal burning station and used as a fuel. Read more »

Landfill Evaluation, Design, Construction, Management & Operations

While a Mid-Atlantic utility was recycling more than half of the Coal Combustion Residuals (CCRs) it generated for reuse in products such as cement and concrete, not all could be reused due to a lack of market demand. In the fall of 2007, the utility voluntarily began hauling and placing its non-beneficially re-used CCRs at privately owned commercial lined landfills as part of a consent decree signed with the state Department of the Environment. Read more »