Upper Sumas Gravity Sewer Upgrade
Client: Sumas First Nation
Location: Abbotsford, BC
Completion Date: 2016
Upper Sumas IR6 Gravity Sewer Upgrade
Upper Sumas IR6 is located east of the City of Abbotsford, BC. The project’s purpose was to replace an existing sagging section of gravity sewer that was causing frequent maintenance issues and sewer backups in the community.
Sumas First Nation retained DNA to provide design and construction engineering services for the project. The Gravity Sewer Upgrades project consisted of constructing 120 m of new gravity sewer, replacing 85 m of existing gravity sewer, installing manholes, service connections, and surface restoration. To protect the new infrastructure, over-excavating the poor clay soils was necessary. A portion of the sewer was also realigned to avoid impacting building structures constructed above the old sewer mains.