Underground Construction - October 2019 - 22
REHABTECHNOLOGY
Hydraulic Pigs Clear Quagga Mussels
from Lake Ontario Intake Pipelines
Jeff Griffin | Senior Editor
Hydraulic pipe pigging was utilized during a recent project in
Canada to clean invasive quagga mussels from three large-diameter freshwater intake pipelines. The deep-water intakes, each more
than 3 miles long, bring water from Lake Ontario into the Island
Water Treatment Plant owned by the city of Toronto.
One of four serving Toronto, the Island treatment plant provides the sole supply of the city's deep lake water cooling (DLWC)
partnership with Enwave Energy Corporation. The DLWC system
operates 24 hours a day, 365 days a year.
Mouths of the pipes are approximately 270 feet below the lake's
surface and run along the natural slope of the lake bottom, following the near-shore embankment and contained on the lake floor by
concrete anchor blocks, comprised of 9,550 cubic yards of concrete.
The project was initiated after an underwater inspection in
2014 conducted by a remotely operated vehicle (ROV) verified the
presence of quagga mussels throughout the entire length of each
intake line. The inspection confirmed that the accumulation of
mussels had significantly reduced water flow from the lake into the
treatment plant.
22
OCTOBER 2019 | UConOnline.com
Small quagga mussels breed rapidly, and quickly clog pipe inlets
or outlets, ultimately requiring physical removal. They also can
disrupt natural ecosystems by facilitating the growth of nuisance
weeds along the bottom of lakes and rivers. Quagga mussels have
spread from Eastern Europe to the United Kingdom and now have
invaded North American waters.
Flow test results prompted the city to initiate planning to clean
all three intakes via hydraulic pigging. This involved inserting and
propelling a device, or "pig," to scrape and clear the pipe interior.
The owner, City of Toronto, tendered the project as a design-build
contract due to limited regional pipe-cleaning expertise, said Niall
Robertson, Island Water Treatment Plant manager. This approach
placed the project risk and the methodologies into the hands of
those best-informed and best-equipped to plan and execute it,
reducing the city's exposure and making project delivery efficient.
Galcon Marine, the general contractor, developed and executed
a plan for cleaning the intake lines and provided complicated
marine logistics and construction support. Montauk Services was
designated as the pigging contractor, Associated Engineering was
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Underground Construction - October 2019
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Contents
Underground Construction - October 2019 - FC
Underground Construction - October 2019 - IFC
Underground Construction - October 2019 - Contents
Underground Construction - October 2019 - 4
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