Caldwell Opengov #10405116

City of Caldwell Wastewater Treatment Plant WAS Thickening Improvements – DAFT Tank, Process Equipment, and Construction

The City of Caldwell, Idaho is seeking bids for major upgrades to its Wastewater Treatment Plant's Waste Activated Sludge (WAS) Thickening system. - Government Buyer: - City of Caldwell Wastewater Treatment Plant - Project managed by the City of Caldwell, with oversight from the Wastewater Engineer - OEMs and Vendors: - Ovivo USA, LLC (primary OEM for DAFT tank and thickening equipment) - Eaton (exclusive OEM for Power XL DG1 Variable Frequency Drives) - Great Basin Industrial (field welding and erection services for DAFT tank) - Products and Equipment Requested: - Dissolved Air Flotation Thickener (DAFT) tanks and associated equipment (Ovivo USA, LLC) - DAFT No. 2, part number ME-570, 8.75 ft diameter, high solids and hydraulic loading rates - Waste Activated Sludge Thickening Equipment, part number CMW00001028-01, including tank, drive, platform, skimmer arms, rake blades, scum trough, and mechanical components - DAFT tank support components: access manhole, support leg, drain connections, sight glass, inlet air connection, flanged connections, internal piping/nozzles - Polymer Blending System Units (PBS-601 & PBS-602), 2 units, emulsion type, with controls - Pressurization Tank No. 1 (T-585), 7 ft diameter, 20 ft height, 125 psi - Pressurization Recycle Pump No. 2 (P-580), 375 GPM, 50 HP - Thickened Sludge Pumps (P-610, P-620), 2 units, progressive cavity, 69 GPM, 20 HP, VFD - Eaton Power XL DG1 Variable Frequency Drives (no substitutions allowed) - Services Requested: - Field welding, erection, and assembly of DAFT tank by Great Basin Industrial, including 218 linear feet of onsite welding and AWS D1.1 certification - Construction and commissioning of DAFT Room No. 2, including site preparation, building enclosure, and all process, electrical, HVAC, and plumbing installations - General construction for WAS Thickening Improvements: excavation, piping, roofing, site grading, and utility protection - Unique/Notable Requirements: - Strict adherence to OEM specifications for all major equipment - Eaton Power XL DG1 VFDs are mandatory; no alternate manufacturers permitted - Coordination with concurrent projects and DAFT tank manufacturer for field services - Contingency allowances for special inspections, work changes, and DAFT tank welding/field services (e.g., $120,000 for welding) - Contractor responsible for permits, utility protection, and compliance with detailed construction milestones - No federal wage rates required; project funded by city funds - Locations: - All work to be performed at the City of Caldwell Wastewater Treatment Plant, 208 Johnson Lane, Caldwell, Idaho 83605 - City of Caldwell offices at 205 S 6th Ave, Caldwell, Idaho 83605 - Qualified vendors with expertise in civil, structural, mechanical, and process systems are encouraged to participate.

Description

The City of Caldwell, Idaho is soliciting bids for the construction of the DAFT Building as part of the Wastewater Treatment Plant upgrades. The project involves construction and commissioning of DAFT Room No. 2, site, structural, and process improvements, yard enhancements, and installation of treatment systems. Bids must be submitted electronically via the City of Caldwell's OpenGov portal by June 2, 2026, 4:00 PM. The project includes civil, structural, mechanical, and process system work and is funded by City funds without federal wage requirements.

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