Underground Construction - October 2019 - 25

work was stopped until this RX-4 could be located and
recovered," Murphey said. "Foul weather delayed the search one
week until the weather improved. The pig had, in fact, exited
the mouth of the pipe but became lodged within the truncated
intake structure. The ROV attached a haul line to the wire 'bow
loop' of the pig, and it was towed clear of the intake without
significant effort or any damage to the structure. An RXSS
'bristle pig' was then immediately shot through the line."
According to Toronto Island Water Plant Manager Robertson,
the pigging methodology was successful in restoring the original
C-factor flow.
"Excessive intake head-losses had been alleviated, thus
increasing production capacity," he said. "The city anticipates
energy savings from pumping costs.
"With a validated procedure now defined, the city will utilize
the pigging methodology for periodic cleaning of the raw water
intakes. Annual flow tests will be performed at the Island WTP
to assess and track pipeline frictional losses due to future quagga
mussel colonization. The future pigging rehabilitation period is
yet to be defined."
Toronto Water is responsible for all aspects of drinking water
treatment and supply, wastewater collection and treatment,
and storm water management. The city ensures that residents,
businesses and visitors have access to clean, safe drinking water
through a complex water treatment process and continuous
testing, so water always meets or exceeds the Safe Drinking
Water Act set by the Ministry of the Environment. Each day,
Toronto treats more than 1 billion liters of safe drinking water.
Associated Engineering Water Division Manager Elia Edwards,
M.A. Sc., P.Eng., described the intake cleaning project as a truly
unique and complex undertaking with no room for error, as the
impact to Toronto's drinking water supply would be devastating
to the city.
"Galcon and Montauk were impressively diligent in the
risk review and then in the subsequent development and
implementation of a comprehensive risk-managed cleaning
program that was delivered without flaw," said Edwards.
Established more than 70 years ago, Associated Engineering has
23 offices across Canada and provides a broad range of services.
Participated in world-class projects in Canada and around the
world, Associated Engineering has been recognized as one of
Canada's best-managed companies for 10 consecutive years.
Galcon Marine Ltd., Toronto, is a full-service marine
construction company providing a range of specialist services
including diving, support barge cranes, and workboats to
accommodate all phases of marine construction.
Montauk Services, based in Hackensack, N.J., is one of North
America's most experienced pigging and pipe testing companies.
It has pigged more than 2 million feet of pipelines, restoring them
to original or near-original condition. Many previous projects have
included removing mussels from pipelines. *
FOR MORE INFORMATION:
Montauk Services, (800) 632-8893, montaukservices.net
Associated Engineering, (416) 622-9502, ae.ca
Galcon Marine Ltd., (416) 255-9607, galconmarine.com

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UConOnline.com | OCTOBER 2019

25
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Underground Construction - October 2019

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