Johnson County Ionwave #2026-017 Addendum 4

Johnson County Wastewater Tomahawk Creek WWTF Process Improvements – Equipment and Construction Services

Johnson County Wastewater is seeking bids for a major process improvement project at the Tomahawk Creek Wastewater Treatment Facility (WWTF): - Government Buyer: - Johnson County Wastewater (JCW), Johnson County, Kansas, Purchasing Division - Project Scope: - Comprehensive upgrades to the Tomahawk Creek WWTF, including: - Installation of Odor Control System No. 4 and covers for BNR Basin anaerobic and pre-anoxic basins - Sidestream nitrogen treatment improvements - Gravity thickener H2S reduction via ferric chloride feed capability - Co-thickening modifications with a new digester feed pump - Addition of pressure sensors with SCADA integration - Sludge cleanout manhole and primary clarifier access improvements (including electric actuators for slide gates) - Micro-C dosing improvements (switching to Plant Effluent Water as carrier) - Addition of submersible mixers in pre-anoxic zones - Digester access improvements (replacement of ladder with stair tower) - Replacement of aluminum slide gates with corrosion-resistant stainless steel (Hydrogate) - Filter complex improvements (electric actuators, safety platforms) - Storm drain isolation system near ferric tanks - OEMs and Key Vendors (equipment sole-sourced or specified): - Hydrogate (stainless steel slide gates and actuators) - Watson-Marlow (chemical metering skid) - Flygt (submersible mixers) - Netzsch (digester feed pump) - R.E. Pedrotti Company (system integration, telemetry, SCADA) - Products/Services Requested: - Stainless steel slide gates and actuators (Hydrogate) - Chemical metering skid (Watson-Marlow) - Submersible mixers (Flygt) - Digester feed pump (Netzsch) - System integration and programming (R.E. Pedrotti Company) - Ductile iron and PVC pressure pipe (various sizes and classes) - Local control panels (NEMA 4X, stainless steel) - CPVC-1 piping for recirculation pumps - Odor control system components (316 stainless steel) - Concrete repairs, micropiles, guardrails, and other construction materials - Notable Requirements: - Prescriptive construction sequencing and outage planning - Compliance with local preference and apprenticeship program policies - 5% bid bond required; electronic bid submission via IonWave - Allowances for building permits and unit price adjustments for certain work items - Field service rates specified for valve service (Mid-America Valve) - Quantities: - 410 LF micropiles, 325 LF guardrail, 150 LF crack repair, 100 SF surface repairs (various types) - 1 each of major equipment items (slide gates, metering skid, mixers, pump, control panels)

Description

This solicitation is for sealed bids for the Tomahawk Creek Wastewater Treatment Facility (WWTF) Process Improvements Project under Contract No. THM1-C031. The project includes multiple improvements such as odor control enhancements with installation of covers and odor control systems, sidestream nitrogen treatment improvements, gravity thickener H2S reduction, co-thickening modifications, sludge cleanout manhole addition, primary clarifier access improvements, Micro-C dosing improvements, pre-anoxic mixers addition, digester access improvements, chlorine contact basin improvements, filter complex improvements, and storm drain isolation near ferric tanks. Bidders must submit a bid bond of 5% of their total bid amount and all bids are to be submitted electronically via IonWave.

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