Douglas County Ionwave #CI-2026-0145

Rehabilitate Digester No. 4 and install specified digester equipment at Omaha’s Missouri River facility

The City of Omaha is seeking construction bids to rehabilitate Digester No. 4 at its Missouri River Water Resource Recovery Facility, with related equipment, piping, and facility improvements. - Buyer: City of Omaha Public Works Department; the Economic Sustainability Program is administered by the City’s Human Rights and Relations Department. - Specified OEMs and major equipment: Ovivo linear-motion mixer (1); Walker Process heat exchangers (3); Varec biogas equipment (1); WesTech combination floating digester cover (1); Vaughan horizontal chopper pumps (3); and Discflo disc pumps (3). These are scheduled lump-sum equipment items; no manufacturer part numbers are provided for them. - Other equipment identified in the drawings: Digester No. 4 mixer MX-1005-008-04 (1), heat exchanger SHE-1005-099-04 (1), transfer pump P-1005-010-04 (1), heating-loop pump P-1005-099-04 (1), biogas flow meter FIT-1005-018-04 (1), and eight 6-inch plug valves. Drawing sets included with the materials also identify equipment for Digesters No. 1–3 and No. 5, with tags and quantities captured below where stated. - Construction scope: Cover replacement and testing; piping, valves, supports, instrumentation, electrical and controls work; access stair and bridge modifications; concrete repair (100 SF); and up to 1,250 SY of additional pavement replacement. Bid items also include site work, mobilization, allowances for cleaning and cover rebalancing, high-water demobilization, contingency, and remaining contract work. - Alternates: Price the west and east annex roof demolition and cooling-tower-stand replacement as separate add alternates. - Notable requirements: Phase construction to keep the facility operating and limit digester outages, with no more than one of Digesters 4 and 5 offline at a time. Contractors must submit an Economic Sustainability Program plan; the documents also describe workforce, small-business, and youth-engagement commitments. The anticipated notice to proceed is followed by 915 days to substantial completion and 945 days to final completion; liquidated damages apply for late completion. - Drawing-set context: The attachments also contain record/as-built drawings for earlier Digester No. 1–3 and No. 5 work. Their listed equipment and services are included in the line-item schedules below, but those drawings do not establish additional quantities or pricing for this bid.

Description

The City of Omaha is requesting bids for rehabilitation of digester No. 4’s lid and installation of a linear motion mixer and heat exchanger systems, along with associated work. The project also includes site work and other work detailed in the contract documents, with bid items for specified equipment and concrete repairs. Bidders must submit an Economic Sustainability Plan, required compliance documents, and bid security; a City of Omaha General Contractor’s License, Class A or B, is required at bid time. Apprentice utilization is optional, and the project has no SEB reserve.

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