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Board reviews multiple wastewater contract changes and $1.78M dewatering design agreement
Summary
City staff presented change orders totaling roughly $342,000 for Davidson Drive and Gulf Sewer pump-station work and proposed a $1.777M professional-services contract for design of a dewatering and conveying system; funding will come from the wastewater bond fund and procurement will include equipment evaluation and DEQ permitting.
City engineering staff briefed the board on several change orders for wastewater projects and on a proposed professional-services contract for dewatering improvements at the Davidson Drive wastewater treatment plant.
Engineering Project Manager Todd Pillar said Max Foote Construction (contractor) discovered existing pipelines and conduits during work at Davidson Drive that must be relocated; he presented Change Order #3 for $233,652 to perform the additional work and said the cost will be funded from the board-approved wastewater bond fund (449). Pillar also presented Change Order #3 at the Gulf Sewer Pump Station for $108,631 to replace failing plug and check valves discovered in existing infrastructure; that work is likewise to be funded from bond fund 449.
Pillar and staff confirmed the wastewater bond account has available balance and that doing the additional work while the contractor is on-site improves efficiency and avoids mobilization delays. Directors asked whether the change orders would cause overruns on fund 449; staff provided a spreadsheet showing a remaining balance and said one more change order will be brought forward.
The board also reviewed a $1,777,000 contract recommendation to Christ Engineers Inc. for professional engineering services to design dewatering and conveying improvements, part of a larger solids-dewatering element of the city's wastewater bond program. Craig Johnson of Christ Engineers described a centrifuge-based dewatering solution, a detailed equipment-procurement process, necessary DEQ construction permitting, and a construction-administration period that staff estimated would cover the construction phase (about 16 months). Staff noted some procurement items (geotechnical, specialty services) may be procured separately from the professional-services agreement.
The items (Change Orders R25231, R25232 and contract R25233) will be presented for board action on Dec. 16.
