Wastewater Digester Lid & Miscellaneous Improvements
Project Manager
City Engineering / David Barth, P.E.
SUA Project No. 16SG01
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What We're Doing
The City of Stillwater and Stillwater Utilities Authority is making improvements to multiple facilities at the Wastewater Treatment Plant. These include: a new lid for Digester A, an automatic transfer switch, a gas collection system used for fueling the heat generation system, basin drains, fencing and roofing.
Anticipated Milestones
- Anticipated Date (Design): Design began FY2017
- Anticipated Date (Construction): Construction began August 2018
- Anticipated Date (Completion): November 2020
Benefits of the Project
Sludge digestion produces corrosive gases that have led to the deterioration of Digester A and B lids.
Budget & Funding
- Year Funded: FY2017
- Funding Source: Wastewater Fund
- Project Budget: $3.1 Million
- Expenditures to Date: $2.5 Million
Project Management
Updates
May 12, 2017: The design kickoff meeting between the City and Freese and Nichols was held on May 8th. The study phase is expected to last five months.
November 15, 2017: Bid Opening for the Automatic Transfer Switch phase occurred November 18th.
January 22, 2018: The study phase for the miscellaneous improvements at the WWTP is now complete and we are moving into final design to include:
- New fixed cover for Digester A,
- Gas collection/handling and safety equipment for all three digesters,
- Aeration basin access and drainage improvements,
- New perimeter fencing surrounding the sludge fields and plant facilities, and
- New roofing on four buildings at the WWTP.
Construction on the Automatic Transfer Switch will begin end of January 2018.
February 27, 2018: Notice to Proceed has been issued to Dane & Associates Electric Co. for the automatic transfer switch replacement.
May 23, 2018: Design Engineer submitted preliminary design for the Digester Lid.
November 19, 2018: Final design is underway and expected to be submitted by February 2019. Bidding and Construction phase will soon follow.
May 31, 2019: Final design is nearly complete. Advertisement for bids is scheduled for June 2019. Construction will likely begin in the fall and is anticipated to last 14 months.
August 20, 2019: Bid for the Digester Lid replacement was awarded to BRB Contractors, Inc.
November 13, 2019: Pre construction meeting to be held on November 18th.
October 2, 2019: Notice to Proceed issued.
January 23, 2020: Trees and fencing have been cleared from the sludge field perimeter.
April 23, 2020: Roofing on the Admin Building, Sludge Pump Building, Maintenance Building, and Digester Control Building is 80% complete. Barbwire fencing is complete along 19th Avenue and in progress along the other boundaries. Work on the Aeration Basins will begin at the end of April, 2020.
June 24, 2020: Work is nearly complete on Aeration Basin 1, and the Admin Building roof work is awaiting inspection.
July 29, 2020: Aeration Basins 1 and 2 are complete and Digester Lid A is underway.
August 27, 2020: Aeration Basins 1, 2 and 3 are complete. The Digester Lid is being welded and prepped for coating.
November 11, 2020: Digester Lid A is in place and the coatings are being applied. The waste gas piping and other digester gas improvements are progressing.
January 4, 2021: Construction of the waster gas burner and gas piping is 90% complete. Digester Lid A has been coated and is currently waiting to be installed.
February 18, 2021: The waster gas burner and gas piping are operational and the sludge from Digester A is being pumped out.
April 8, 2021: Damage was discovered on the walls of Digester A after the sludge was pumped out. The concrete wall is currently being repaired.
June 2, 2021: Digester A concrete has been hydro blasted.
August 31, 2021: All work on the project is now complete.
Actions authorized by Stillwater Utilities Authority (SUA):
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4.17.14 | SUA-17-08 | Authorization of Professional Services Agreement
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12.04.17| SUA-17-42 | Bid Recommendation for Automatic Transfer Switch
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1.22.18 | SUA-18-05 | Professional Services Contract Amendment for Final Design
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8.19.19 | SUA-19-33 | Bid Recommendation for Digester Lid Replacement and Miscellaneous Projects at the WWTP
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