Tomahawk Creek Wastewater Treatment Facility Process Improvements Project

Project Information

Bid Title: Tomahawk Creek Wastewater Treatment Facility Process Improvements Project
Issuing Agency: Johnson County
Location: Kansas
Published Date: May 20, 2026
Closing Date: Jun 25, 2026
Government Level: State & Local
Status: Closed
Ref. #: 2026-017
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Project Description: Bid Information

Type Invitation for Bid

Status Issued

Number 2026-017 (Tomahawk Creek Wastewater Treatment Facility Process Improvements Project)

Issue Date & Time 5/20/2026 08:00:00 AM (CT)

Close Date & Time 6/25/2026 02:00:00 PM (CT)

Question Cut Off Date 6/15/2026 10:00:00 AM (CT)

Notes
S e a l e d b i ds f or Bi d R e q u est No. 2026-017 f or J o h nson C o u n t y W a s te w a ter Tomahawk Creek WWTF Process Improvements Project – Contract No. THM1-C031. The w ork co n s i s ts of th e f ol l o w i n g 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 H 2 S 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.

Bi d d e rs s h a l l su b m i t w i th t h e i r b i d a b i d b o n d i ss u e d b y a s u r e t y c o m p a n y l i c e n se d to do b us i n ess i n t he S t a te of K a nsas i n t h e a m o u nt of f i v e p e r ce nt (5%) of the to t al a m o u nt of th ei r b i d. S aid g u ara n tee s h a l l b e m a d e p a y a ble to the B o a rd of Co u n t y Co m m i ss i o n ers of Jo h nson C o u n t y , K a nsas.

All bids shall be submitted electronically on IonWave .

Contact Information

Name Nicole Averell

Address 111 S. Cherry
Olathe, KS 66061 USA

Phone (913) 715-0595

Fax

Email

Bid Documents

Document name Format

Bid Invitation
Acrobat / PDF BINVAVL 9395655

Bid Attachments

File Name Description File Size

12 items in 1 pages

00 16 00 - Q - Questionnaire.docx
00 16 00 - Q - Questionnaire 38 KB 348063 7423267

00 15 00 - BB - Bid Bond.docx
00 15 00 - BB - Bid Bond 41 KB 348063 7423270

Tomahawk Creek WWTF Process Improvements 100% Specifications.pdf
Tomahawk Creek WWTF Process Improvements 100% Specifications 22.83 MB 348063 7423240

Tomahawk Creek WWTF Process Improvements 100% Drawings.pdf
Tomahawk Creek WWTF Process Improvements 100% Drawings 87.42 MB 348063 7423241

Tomahawk Creek, Contract 26 WWTF Expansion V1.pdf
Tomahawk Creek, Contract 26 WWTF Expansion V1 34.79 MB 348063 7423243

Tomahawk Creek, Contract 26 WWTF Expansion V2.pdf
Tomahawk Creek, Contract 26 WWTF Expansion V2 205.98 MB 348063 7423246

Tomahawk Creek, Contract 26 WWTF Expansion V3.pdf
Tomahawk Creek, Contract 26 WWTF Expansion V3 67.42 MB 348063 7423250

Tomahawk Creek, Contract 26 WWTF Expansion V4.pdf
Tomahawk Creek, Contract 26 WWTF Expansion V4 36.62 MB 348063 7423252

Tomahawk Creek, Contract 26 WWTF Expansion V5.pdf
Tomahawk Creek, Contract 26 WWTF Expansion V5 49.29 MB 348063 7423256

Tomahawk Creek, Contract 26 WWTF Expansion V6.pdf
Tomahawk Creek, Contract 26 WWTF Expansion V6 38.22 MB 348063 7423259

Tomahawk Creek, Contract 26 WWTF Expansion V7.pdf
Tomahawk Creek, Contract 26 WWTF Expansion V7 37.21 MB 348063 7423261

Tomahawk Creek, Contract 26 WWTF Expansion V8.pdf
Tomahawk Creek, Contract 26 WWTF Expansion V8 30.78 MB 348063 7423264
Commodity Codes: NAICS 221320Sewage Treatment Facilities
NAICS 236220Commercial and Institutional Building Construction
NAICS 541611Administrative Management and General Management Consulting Services

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Type	Invitation for Bid
Status	Issued
Number	2026-017 (Tomahawk Creek Wastewater Treatment Facility Process Improvements Project)
Issue Date & Time	5/20/2026 08:00:00 AM (CT)
Close Date & Time	6/25/2026 02:00:00 PM (CT)
Question Cut Off Date	6/15/2026 10:00:00 AM (CT)
Notes	S e a l e d b i ds f or Bi d R e q u est No. 2026-017 f or J o h nson C o u n t y W a s te w a ter Tomahawk Creek WWTF Process Improvements Project – Contract No. THM1-C031. The w ork co n s i s ts of th e f ol l o w i n g 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 H 2 S 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. Bi d d e rs s h a l l su b m i t w i th t h e i r b i d a b i d b o n d i ss u e d b y a s u r e t y c o m p a n y l i c e n se d to do b us i n ess i n t he S t a te of K a nsas i n t h e a m o u nt of f i v e p e r ce nt (5%) of the to t al a m o u nt of th ei r b i d. S aid g u ara n tee s h a l l b e m a d e p a y a ble to the B o a rd of Co u n t y Co m m i ss i o n ers of Jo h nson C o u n t y , K a nsas. All bids shall be submitted electronically on IonWave .

Name	Nicole Averell
Address	111 S. Cherry Olathe, KS 66061 USA
Phone	(913) 715-0595
Fax
Email

Tomahawk Creek Wastewater Treatment Facility Process Improvements Project

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