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Ongoing Pond Excavation of Active Ash Pond

SITUATION
A utility needed to complete a pond excavation project of over 500,000 cubic yards from within the station’s active ash pond.

INNOVATIVE SOLUTIONS
Charah Solutions provided project design, engineering and completion of pond excavation for a multi-phase, multi-year landfill operations and gypsum handling.

Phase I of the project involved excavating and transporting over 340,000 tons of ash from the basin to the onsite landfill.

Phase II, still ongoing, involves removing 100,000 tons of soil to lower a dam by 25 ft., installing French drains and constructing a structural fill pad to allow for the installation of a Waste Water Treatment building.

The project allows for disposal operations for approximately 570,000 tons of ash per year and incorporates conditioned fly ash from silos, bottom ash from a dry bottom boiler, dewatered gypsum from horizontal belt filters, and waste water treatment sludge from filter presses. Landfill expansion and closure construction is conducted annually, as needed. In addition, the project includes gypsum loadout of approximately 165,000 tons per year to third party trucks, ash silo operations plus general predictive and corrective maintenance, fly ash and bottom ash marketing services, and dust control (plant-wide) and station road maintenance.

RESULTS
Charah Solutions provided project design and engineering, followed by ongoing completion of a pond excavation project of over 500,000 cubic yards from within the station’s active ash pond. Ash is being excavated, dewatered, loaded, hauled and placed into an engineered fill within the underutilized area of the ash pond.