Water Wastes Digest Awards IWPC for Top Project 2020 Winner

The CON-149, Emergency Rehabilitation of the Northwest Interceptor was recognized by Water Waste Digest as one of the Top Projects in 2020. Inland Waters Pollution Control (IWPC), a subsidiary of Inland Pipe Rehabilitation (IPR), was honored by the support of FK Engineering Associates, Applied Science, Inc., and Great Lakes Water Authority.

Overview CON-149, Emergency Rehabilitation of the Northwest Interceptor


Inland Waters Pollution Control (IWPC), a subsidiary of Inland Pipe Rehabilitation (IPR), oversaw the design and performance of over 2,700 linear feet of the 6-foot 3-inch inner diameter Northwest Interceptor (NWI) sanitary sewer rehabilitation in Detroit, Michigan. The rehabilitation included the construction of two flow control chambers, emergency support of an actively failing tunnel, and a complete relining of over 800 linear feet. Built-in 1929, the NWI services hundreds of thousands of residents and businesses in communities such as Detroit, Redford, Livonia, Westland, and more.


IWPC, under contract with Great Lakes Water Authority (GLWA), performed a closed-circuit television inspection of the NWI and revealed several major structural defects. Due to the high flow rate and limited access, further manned entry inspections were required. After a full examination, FK Engineering (FKE) and IWPC confirmed with GLWA that immediate rehabilitation was needed. IWPC recommended using IPR’s EcoCast geopolymer lining system for the job. Compared to alternative trenchless rehabilitation solutions, IPR’s EcoCast process uses a fully contained unit with portable and collapsible equipment that allows easy access to hard to reach locations of the interceptor. The equipment makes manhole access and easement work feasible without significant effort or disruption. IWPC, in association with FKE, developed and led construction and design teams to begin the rehabilitation process. Before the EcoCast installation, prep work was required, which included a multiple flow chamber bypass system, emergency tunnel support, cement and steel installations, spot repairs, debris removal, and manhole structure raises


Upon the completion of the steel and cement grout installation, IWPC installed 132 ribs within the tunnel and avoided the collapse of the interceptor. After the completion of a successful bypass system, IWPC began the EcoCast installation of over 800 linear feet. IWPC successfully restored the roundness and sealed infiltrations throughout the relining. IWPC and their team demonstrated their rehabilitation expertise in successfully performing precise investigations, mandating careful design plans, collaborating with subcontractors and engineers, and quality in the work show. Through IWPC’s efforts, the NWI was prevented from collapse and has renewed a design life of 50 years.

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Water & Waste Digest Top Projects Award

The 2020 WWD Top Projects program calls for nominations annually to celebrate the best projects in the design and construction phase within 18 months of the nomination deadline. These projects represent the best work done across a multitude of installations, sizes and budgets.

Read more about Water & Waste Digest's Top Project Award

COVID-19 Update

As we work through the impacts of COVID-19, we remain committed to the health and safety of our employees and their families first. While following guidance from the Center for Disease Control (CDC), Occupational Safety and Health Administration (OSHA) and National Association of Sewer Service Companies (NASSCO), we will continue to provide service to our customers and community. We understand that these are difficult times, and we are committed to helping the community by hiring those seeking employment. If you feel that IPR could help you, follow the link to our current job opportunities.