New Westminster Columbia Section Rehabilitation—Large Diameter Sliplining

Metro Vancouver is responsible for the conveyance and treatment of wastewater for the Greater Vancouver area which is home to approximately 2.5 million residents. Sections of the wastewater conveyance system are reaching the end of their design life or have experienced accelerated degradation due to corrosive conditions. One such sewer is the New Westminster Interceptor (NWI) Columbia Section, which is a 1.6 km concrete sewer ranging from 1,067- to 1,524-mm diameter. Metro Vancouver has performed temporary repairs along the Columbia Section over the past 20 years. Jacobs was retained as the design engineer to develop a long-term solution and provided construction engineering services for trenchless rehabilitation of the NWI Columbia Section by sliplining the existing concrete pipe with new fiber-reinforced polymer (FRP) pipe. This paper provides an overview of the project and presents a case study of the challenges as they relate to the Owner, Engineer, and various stakeholders.