SLED Opportunity · KANSAS · JOHNSON COUNTY
AI Summary
Invitation for Bid for Johnson County Tomahawk Creek Wastewater Treatment Facility Process Improvements including odor control, sludge treatment, mechanical upgrades, and safety enhancements. Bids due July 1, 2026.
Sealed bids for Bid Request No. 2026-017 for Johnson County Wastewater Tomahawk Creek WWTF Process Improvements Project – Contract No. THM1-C031. The work consists of the following improvements to the Tomahawk Creek WWTF: A. Odor Control Improvements: Installation of covers on the BNR Basin anaerobic and pre-anoxic basins, and addition of Odor Control System No. 4. Customized rubber mat covers will also be added to the BNR Influent Splitter Box and RAS Splitter boxes to mitigate odor complaints and improve operational flexibility for VFA production. B. Sidestream Nitrogen Treatment Improvements: Separation of centrifuge startup/shutdown slop flows from the main centrate discharges and redirection to the plant drain to reduce solids accumulation in the Centrate Holding Basin. C. Gravity Thickener H2S Reduction: Addition of ferric chloride feed capability to the Primary Sludge Gravity Thickener/Fermenter to reduce hydrogen sulfide generation and loading on odor control units. D. Co-Thickening Improvements: Modifications to allow thickened primary sludge (TPS) to discharge directly to the Co-Thickened Sludge (CTS) wetwell, addition of a fifth digester feed pump for continuous mixing, and installation of pressure sensors on digester feed pump discharge piping with SCADA integration. E. Sludge Cleanout Manhole: Addition of a sludge cleanout manhole over the (3) 4” CTS lines between the Solids Processing Building and Digester Control Building to facilitate future line cleaning. F. Primary Clarifier Improvements: Construction of an access drive and installation of cleanouts for scum pit drainpipes, and addition of electric actuators to six PC Influent Slide Gates at the Headworks Building. G. Micro-C Dosing Improvements: Replacement of potable water with Plant Effluent Water (PEW) as carrier water for Micro-C dosing, and rerouting of Micro-C discharge lines above grade for improved visibility and control. H. Pre-Anoxic Mixers: Addition of a second submersible mixer in pre-anoxic zones PAX1-1 and 3-1 to facilitate the movement of scum out of pre-anoxic zones. I. Digester No. 3 Access Improvements: Replacement of the existing 21-ft tall cageless ladder with a stair tower to improve safety and accessibility to the digester roof. Demo of existing ladder. J. Chlorine Contact Basin Improvements: Replacement of all aluminum slide gates with corrosion-resistant materials due to chloride-induced deterioration. K. Filter Complex Improvements: Installation of an electric actuator on the secondary effluent/filter influent gate for automated wet weather operation, and addition of safety platforms to the eight disk filter basins to enhance maintenance access and safety. L. Storm Drain Isolation near Ferric Tanks: Installation of an isolation drainage system near the ferric chloride truck unloading station to prevent chemical spills from entering the storm sewer system, as identified by KDHE. Bidders shall submit with their bid a bid bond issued by a surety company licensed to do business in the State of Kansas in the amount of five percent (5%) of the total amount of their bid. Said guarantee shall be made payable to the Board of County Commissioners of Johnson County, Kansas. All bids shall be submitted electronically on IonWave. --- Q&A --- Q1: Reference spec section 03 30 53.1 2.3.A – it says that all test required for Engineer acceptance of materials and concrete mixtures shall be made at Contractor’s expense. This is in conflict with general note 1 for special inspections on sheet 000-S-001 which states that special inspections and tests will be conducted by agencies employed by the Owner. Please confirm whether materials testing will be provided by the Owner or Contractor. A1: Refer to Addendum No. 3 Submitted: 6/15/2026 09:53:25 AM (CT) Q2: Please clarify if the Sludge Cleanout Vault requires an interior coating and/or exterior waterproofing on the walls. A2: Refer to Addendum No. 3 Submitted: 6/15/2026 09:38:26 AM (CT) Q3: Page 052-M-401 is referenced twice within the drawings but not included. Could you please provide this sheet. A3: Refer to Addendum No. 3 Submitted: 6/15/2026 09:36:57 AM (CT) Q4: Please provide gate details for WG6103 and the manufacture shop drawings for this gate and stem information. (This was noted as not manufactured by HydroGate per the quotation provided within the bid documents and subject to quotation price change.) A4: Refer to Addendum No. 3 Submitted: 6/15/2026 09:36:23 AM (CT) Q5: Is a geotechnical report available for this project? If so, please provide a copy. A5: Refer to Addendum No. 3 Submitted: 6/15/2026 09:35:56 AM (CT)
SLED stands for State, Local, and Education. These are solicitations issued by state governments, counties, cities, school districts, utilities, and higher education institutions — as opposed to federal agencies.
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