Outfall work continues for the Powell River Consolidated Wastewater Treatment Plant

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JJM Construction deploys and sinks the offshore section, completing an essential part of the project infrastructure

Work is underway to dig the offshore section of the marine outfall of the consolidated wastewater treatment plant.

The work took place on July 22.

According to information provided by City of Powell River Engineering Technologist Mik Drosdovech, general contractor Graham Infrastructure’s outfall subcontractor, JJM Construction Ltd, is deploying and sinking the offshore section of the marine outfall. , thus completing this essential infrastructure.

Drosdovech said this offshore section of the marine outfall measures approximately 580 linear meters (1,900 feet) and is constructed from 12.2-meter and 15.2-meter (40- and 50-foot) segments of high-density polyethylene pipe. density of 900 mm (36 inches in diameter). with 2.67 inch thick walls) that were welded together by butt fusion.

According to Drosdovech, the offshore section of the marine outfall has 101 concrete weights attached to the pipe that will help sink the outfall and are ultimately designed to secure the outfall in its final position on the seabed.

“The final resting place of the broadcast section (offshore end) of the marine outfall will be approximately 700 linear meters (2,300 feet) from shore, at a depth of over 52 meters (170 feet),” said Drosdovech.

He said deployment of the offshore section of the marine outfall began with JJM crews towing the weighted section of pipe out of the pond and into place at First Beach, then connecting the floating offshore section of the outfall at the intertidal section of the outlet that was installed in mid-May. Crews would then position the offshore section of the outfall pipe with two or three barges and tugs and begin filling the pipe at a set rate by pumping in seawater to allow the pipe to sink, according to Drosdovech.

There are a number of variables that could speed things up or slow them down, such as guiding the hose around certain rock features or poor ground conditions on the seabed as divers guide it down, but for the Now, final placement is scheduled for early evening July 22, Drosdovech said.

“Overall, it will be a long day for the JJM and Graham teams, but given the tremendous effort they have put into planning, scheduling and organizing this important stage of the consolidated wastewater treatment plant project, we are collectively confident that all are going accordingly,” Drosdovech said.

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