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The Grandview Interceptor project will rehabilitate 9,600 feet of existing 30-inch sewer pipe and about 30 manholes to prolong its life and make it structurally sound.
An interceptor is a sewer line that receives wastewater from multiple collector pipes and transmits it to a wastewater treatment plant. Interceptors are usually 15 inches or greater in diameter. This interceptor is named for its location on Grandview Ave. in University Place.
The Problem
High concentrations of hydrogen sulfide gas from two collector pump stations have corroded the Grandview Interceptor's reinforced concrete pipe to the point that its long-term structural integrity is in question. The hydrogen sulfide gas comes from naturally-occurring bacteria.
The Solution
To rehabilitate and protect the pipe, it will be lined with Cured In Place Pipe (CIPP). CIPP is a hollow tube-shaped pipe liner that is pulled flat into the pipe and inflated like a balloon with air or water. When heat is applied, resin embedded in the liner permanently sticks to the inside of the concrete pipe, covering the original surface and protecting it from the hydrogen sulfide.
The manholes will be coated with spray-on epoxy or polyurethane depending on their condition.
The work can be done with little or no excavation and minimal impacts to street traffic. During construction a pipe storage area will impact access to trails and entrances to Chambers Creek Properties and part of the North Meadow.
Current Status
The project design is 90% complete and construction will be completed in two phases. The first phase of construction will begin in the summer of 2012.
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 Pre-construction site looking east
Click to enlarge
Pre-construction site looking north
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