The Capital Regional District (CRD) has awarded a $17.7-million contract to NAC Constructors Ltd. (NAC) to construct the Arbutus Attenuation Tank.

As part of the Wastewater Treatment Project, the Arbutus Attenuation Tank is a 5,000m3 underground concrete tank that will be located within CRD-owned land in Haro Woods.

During high volume storm events, the Arbutus Attenuation Tank will temporarily store wastewater flows to reduce the number of sewer overflows. Once the high storm flow has passed, the tank will empty back into the sewer system and will be conveyed to the McLoughlin Point Wastewater Treatment Plant for tertiary treatment.

NAC is an employee-owned Canadian firm established in 1993. As a general contractor, NAC has successfully completed projects all across Canada ranging from large-scale municipal and civil projects, to heavy industrial projects.

Construction of the tank is anticipated to begin June 2019 and take 16 months to complete. Site clearing took place in early March before the bird nesting window. During construction, the site and the laydown area will be fenced. Once construction is complete the site will be planted with vegetation appropriate for the local woodland setting.

The Wastewater Treatment Project is being funded by the Government of Canada, the Government of British Columbia, and CRD.

About the Wastewater Treatment Project

The Wastewater Treatment Project will provide tertiary treatment for wastewater from the core area municipalities of Victoria, Esquimalt, Saanich, Oak Bay, View Royal, Langford and Colwood. It will also provide tertiary treatment for wastewater for Esquimalt First Nation and Songhees First Nation. The project consists of the McLoughlin Point Wastewater Treatment Plant and the Residuals Treatment Facility at Hartland Landfill. It also consists of the conveyance system that will carry wastewater from across the core area to the McLoughlin Point Wastewater Treatment Plant, and residual solids to the Residuals Treatment Facility.


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