Halifax Water is the largest water, wastewater and stormwater utility in Atlantic Canada servicing a population of more than 360,000. As part of the utility’s innovative and pro-active wastewater asset renewal program, the use of sewer rehabilitation technologies has been utilized over the past several years.
In May 2017, Halifax Water awarded the large scale $18.7 million (CAD) rehabilitation of the Northwest Arm trunk sewer. Liquiforce Services and Insituform Technologies are the contractors on the project.
The project is being funded through the Clean Water and Wastewater Fund announced in 2016. The Province of Nova Scotia and Halifax Water are each contributing just over $4 million while the Government of Canada is contributing just over $8 million.
The project involves the cured-in-place pipe (CIPP) rehabilitation of 4,000 m of 1,200 mm round and 1,200 mm by 1,500 mm arch sewer pipe constructed in 1917 along the shoreline of the Northwest Arm, a marine (salt) water body in Halifax, Nova Scotia. Consultants on the project are Robinson Consultants and CBCL Ltd.
The Northwest Arm is valuable recreational, economic and quality of life asset in the community. The location of the sewer presents significant challenges for accessibility which will result in CIPP installation lengths in excess of 600 m and the need to complete a significant amount of the liner fabrication on site. The goal of the rehabilitation is to remove debris, restore the structural integrity, eliminate exfiltration, establish a corrosion barrier and extend the life of the sewer for up to 75 years.
Construction began in June 2017 and is anticipated to be completed by December 2017.