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CCR Projects

Montour Power Plant

Project Description

During a prior environmental risk assessment conducted at an existing fly ash impoundment in Washingtonville, Pennsylvania, the potential for slope failure was identified along two isolated portions of the approximately 35 foot high containment berm.

Activities Performed

KEY provided oversight of the collection of pertinent data to characterize the structural properties of the fly ash impoundment berm, defined water saturation conditions at the respective areas of data collection, and employed a computer model to calculate the safety factors for the berm slope stability under static and seismic conditions. KEY also provided complete construction plans for the recommended corrective actions to increase the factor of safety of the targeted portions of the fly ash impoundment berm.
The corrective actions were cost-effectively constructed utilizing on-site materials. The following activities below were performed on site:

  • Oversaw field investigation and sample collection

  • Coordinated laboratory geotechnical testing of collected samples

  • Utilized the collected geotechnical data to characterize the overall structural properties of the fly ash impoundment berm

  • Calculated the existing safety factors for the berm slope stability under static and seismic conditions based on the collected data

  • Provided to the client alternatives for increasing the existing factor of safety of the fly ash impoundment berm utilizing on-site fill materials or imported gravel fill

  • Provided the client complete construction drawings for implementation of the preferred corrective action alternative

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