Trenchless Technology

Fall Canada 2018

Trenchless Technology is the premier communications vehicle for the trenchless industry. Through our multiple platforms, readers receive insights into the trenchless industry, as well as keep connected to the latest news, products and projects.

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Page 22 of 39

W W W.T R E N C H L E S S T EC H N O LO GY.C O M/C A N A DA 23 The first challenge was geography. Powell River is known for its natural beauty along the northern Sunshine Coast of British Columbia. Though it is on the mainland, the City is not connected to the provincial highway network. Thus, getting to Powell River requires the use of ferries. Trans- porting the equipment and the pipe to the site went with- out a major hiccup. The trunk main alignment , however, required Murphy Pipeline Contractors to re-engineer the project to be com- pleted in one continuous pull . When installing the pipeline in 1964, the original con- structors excavated a large trench to achieve the desired elevation profile for the pipeline. The trench remained and over time a wetland formed over the 1,000 m long trench. The wetland is now home to a number of amphibian and bird species and serves as a headwater source for the Miller Creek, which flows into Cranberry Lake. The original plans called for draining the wetland and sliplining in several lengths. With the re-engineered ap - proach, Murphy Pipeline Contractors was able to slipline the entire length without draining the wetland, thus keep - ing this important environmental resource intact . As the major water source for the City, a bypass network had to be created. The contractor set up a bypass where water was fed, via four floating submersible pumps, from Haslam Lake to a holding tank. The water was fed, via gravity, from the holding tank to the UV treatment facility where it was distributed to the City. The tank was necessary as an intermediary step because Murphy Pipeline Contrac- tor could not pump water directly into the UV treatment facility without causing major damage to the UV reactor. With the project complete, Powell River now has a new watermain with a life expectancy of more than 100 years. Mike Kezdi is associate editor of Trenchless Technology Canada . Murphy Pipeline Contractors re-engineered the sliplining project so that it could slipline the entire 1,340 m HDPE pipe in one pull and protect a wetland.

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