Project Overview

Due to the new Federal and State CCR regulations, the CCR basins at this retired, coal-fired facility required clean closure, including the removal of a state-regulated dam. This large volume, high visibility project had a mandated completion date and almost constant scrutiny by the media and both government and non-government environmental groups.

"To aid in placement, Trans Ash ensured that the CCR material was within the optimum moisture range and provided ample staffing and equipment to safely and effectively complete the task."

Project Challenges & Solutions

Due to the new Federal and State CCR regulations, the CCR basins at this retired, coal-fired facility required clean closure, including the removal of a state-regulated dam. This large volume, high visibility project had a mandated completion date and almost constant scrutiny by the media and both government and non-government environmental groups.

The schedule and environmental factors created a unique set of challenges:

  • Trans Ash was required to work in a regulated basin with an active water table. Trans Ash managed the regulated impoundment with GPS grade control combined with a general oversight plan. The active water table component was managed through the utilization of multiple excavation techniques including both mechanical and hydraulic methods, while maintaining basin stability throughout the excavation process.
  • The harsh coastal climate and heavy rains, including a Category 1 hurricane/1,000 year rain event created constant weather challenges. Trans Ash’s construction plan created a project management system that ensured the site was constantly prepared for extreme weather events.
  • The CCR basins created a potentially unstable work surface. Therefore, Trans Ash worked in collaboration with the client to co-create a stability analysis plan and an excavation and setback barrier plan Initially, the landfill space available for placement was limited, as the existing landfill construction contractor was completing construction. To aid in placement, Trans Ash ensured that the CCR material was within the optimum moisture range and provided ample staffing and equipment to safely and effectively complete the task. Trans Ash also engaged in co-sponsored traffic control and communication plan with the existing contractor.
  • Cover soil availability and the associated properties created substantial erosion control challenges. Trans Ash utilized extensive erosion control measures with multiple vegetation systems. Trans Ash’s construction plan also expedited the landfill closure process to minimize the potential for erosion.
  • The landfill leachate collection system and discharge permit availability initially limited the system capacity. Trans Ash controlled the landfill placement area, utilized leachate as a dust suppression method and used an alternative leachate collection and removal process.
  • The active haul roads were directly under the transmission line corridor. Trans Ash ensured that the haul roads were in compliance with the transmission easement and maintained offsets from critical infrastructure.
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Sheet Pile Installation

Project Scope Highlights

  • Excavate, haul and place 4M cubic yards of CCR material
  • Hydraulic dredge, dewater, haul and place 1.3M cubic yards of CCR material
  • Install 5,000LF of sheet pile in discharge canal
  • Provide erosion control and dust suppression
  • Leachate monitoring
  • Remove existing outfall structures from basin
  • Remove a state-regulated dam
  • Operate CCR landfill
CCR Landfill Operation
18 In. Hydraulic Dredge
Basin Before
Basin After

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