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South and Central Segments - Construction completed.
North Segment - Currently under construction. The force main construction will be completed in November 2017. Restoration of Heartland of America Park will be completed by May 2018.
The existing South Interceptor Force Main (SIFM) was constructed in the early 1960s and has remained in continuous operation for more than 50 years. The current condition of the existing SIFM makes it unreliable for continued long term use and replacement is necessary to convey dry and wet weather flows to the Missouri River Wastewater Treatment Plant (MRWWTP). Rehabilitation is not a viable option as the force main does not have a back-up and must run continuously. The new SIFM will provide this needed reliability in addition to increased flow capacity.
The new SIFM will consist of approximately 4,360 feet of 48-inch diameter pipe from south of the I-480 Bridge to the new Leavenworth Lift Station and 18,390 feet of 64-inch diameter pipe from the new Leavenworth Lift Station south to the MRWWTP. Various other sewers and structures required to convey flows from Leavenworth Street, Hickory Street, and Pierce Street sewers to the Leavenworth Lift Station are also included in the project. Abandonment and/or elimination of the existing SIFM will be evaluated after the new SIFM is placed into service. The SIFM is being constructed in three segments: North, Central and South.
Construction of the South and Central Segments is complete.
Construction of the North Segment was placed on hold in 2016 after encountering a geologic anomaly where the bedrock elevation was lower than anticipated, resulting in the tunnel boring machine existing the competent rock and entering an area with sand, boulders, and groundwater present. The tunnel boring machine was not capable of advancing through this area. An evaluation was conducted which considered numerous options to complete the project. An alternative that included a rescue shaft and a new micro-tunnel boring machine was selected in January 2017. The rescue shaft was completed in July 2017 and the micro-tunnel boring machine completed the remaining 801 feet of tunnel in August 2017. Both the original tunnel boring machine and the micro-tunnel boring machine have been removed from the project site and the contractor is installing the force main piping. The force main construction will be completed in November 2017. Restoration of Heartland of America Park will be completed by May 2018.
LTCP Project Name: South Interceptor Force Main
Construction Contract: OPW 52223 – South Interceptor Force Main-North Segment
Construction Contract: OPW 52222 – South Interceptor Force Main-Central Segment
Construction Contract: OPW 51873 – South Interceptor Force Main-South Segment
Construction Contract: OPW 52134 – Martha to Riverview Lift Station Phase 1 (See Martha Street Sewer Separation Phase 1 Project)