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. 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 the CRD.