Project will boost capacity, build resilience
The existing 48 inch pipe was constructed in 1969. Inspection of the pipe in 2011 identified corrosion of the interior concrete surface. The existing pipe is also nearing capacity. To meet future anticipated growth, either a bigger pipe (called a replacement sewer) or a second pipe (called a relief sewer) working in parallel with the existing pipe is required.
The selected project is the relief sewer option. Once the relief sewer is completed, the district intends to rehabilitate the existing pipe by inserting a new lining to protect against further corrosion. This construction strategy reduces risks and total project costs because building the relief sewer first minimizes the need for costly bypass pumping during construction. And ultimately, operating two sewer lines will enhance the resilience of the collection system.
It will be a big dig
When the project gets underway in 2019, it will involve tunneling under East Washington Avenue and excavating at depths exceeding ranging between 20 to 45 feet. Traffic will be impacted on Lien Road between Parkside Drive and Thierer Road. The District is working with Strand Associates on the design and expects to bid the project in February of 2019 with construction from summer of 2019 to summer of 2020.
Four different routes were presented on May 30, 2018 at a public meeting. Residents, members of the business community and property owners in attendance at the meeting provided feedback on the alternatives. The alternatives analysis was completed in June 2018, and Alternative 3 was the recommended route for the relief sewer. Alternative 3, which runs along the west edge of Reindal Park, was presented and approved by the City of Madison Parks Board at their June 13, 2018 meeting. The final selected route was presented at a community meeting on Wednesday, Oct. 17, 2018.
For questions, contact Jen Hurlebaus, Madison Metropolitan Sewerage District project manager, firstname.lastname@example.org or 608-222-1201 ext 248.