Due to the new state CCR regulations, the CCR basin at this retired, coal-fired facility required clean closure. This clean closure necessitated the construction of an on-site CCR landfill. This high visibility project had a state-mandated completion date and almost constant scrutiny by the media and both government and non-government environmental groups.
"Trans Ash’s construction plan ensured environmental and engineering compliance. Extensive erosion control safeguards and containment systems were used throughout the project."
Project Challenges & Solutions
The timing of the construction and the state-mandated schedule created the following challenges:
- Trans Ash worked concurrently with an existing contractor who was removing CCRs for a beneficial use project. Consequently, the landfill construction space was restricted and required an updated construction sequence. Trans Ash worked cooperatively with the client to re-evaluate the schedule and devise an appropriate phasing plan.
- An on-site wetland created some traffic flow and accessibility issues. Trans Ash followed a strict ES&C plan to address this issue and protect the wetland.
- Due to previous environmental issues and proximity to the river, this was a heavily scrutinized project with much local interest. Trans Ash’s construction plan ensured environmental and engineering compliance. Extensive erosion control safeguards and containment systems were used throughout the project.
- The clay available at the on-site borrow area did not meet specifications in its original state. Trans Ash utilized a screening system to ensure all the non-spec material was removed.
- The landfill leachate collection system required a tie-in with the local municipality’s water treatment system. Trans Ash coordinated a strict tie-in schedule with the client, the certified sub-contractor, and the city to ensure there was no interruption of service to the surrounding community.
- During construction, a previously unidentified, asbestos disposal site was discovered. Trans Ash immediately ceased activity, isolated the area, and contacted the
client. A remediation sub-contractor was utilized to remove the material.
- Midway through the project, the on-site CCR removal contractor was replaced. This change limited the available CCRs required for the liner system protective cover. Trans Ash modified the construction schedule and created a communication plan to coordinate activities with the new contractor.