Cooling Spray Pond Dredging

Ballard mobilized personnel and fabricated site-specific specialty equipment to perform sediment removal operations at two spray ponds within the plant. A five man dive/dredge crew performed work scope that included: training, badging, site set up, installation of diving systems, installation of twin 6″ dredging systems, daily production tracking, QA / QC reporting, pre and post dredge surveys and demobilization. One primary task was setting up the dredge spoils area including installing geotubes to capture the sediment. Ballard installed 6″ dewatering pumps in a sump that the geotubes drained into, to recover water and move it to the cooling tower wet wells.

All work performed on time and safely – zero accidents or lost time events.

  • Due to limited visibility tenders monitored diver location and controlled position through careful umbilical management
  • The spray ring is held in position by concrete pylons which pose a risk of entanglement, careful payout of dredge hose and two way communications successfully mitigated this risk
  • Ballard created a custom dredge head ­­that was site specific to increase the efficiency of this project.