UPDATE: https://www.huntsvilletx.gov/DocumentCenter/View/18559/FY-23-Budget-Book-- N. B. Davidson WWTP Rehabilitation Project A detailed scope has not yet been determined This project is included in the city's 2023-2027 Capital Improvement Plan (CIP). As of December 16, 2022, further details regarding design and construction have not been identified. _____________________________________________________ The City of Huntsville, TX (hereinafter referred to as the "City") invites Civil Engineers, Multi-Disciplinary Firms and any other qualified professionals, registered with the Texas Board of Professional Engineers, to submit qualifications to provide professional design engineering and construction support services for wastewater treatment plant rehabilitation & expansion improvement projects as listed below: PROJECT: N.B. Davidson Wastewater Treatment Plant (WWTP) Replacement Design, COH ID#: 21-10-07 N.B. Davidson Wastewater Treatment Plant (WWTP), also known as the South Plant, was originally constructed in 1971 with main treatment units consisting of an aeration basin (oval shaped tank with rotating disc aerators), a clarifier and sludge drying beds. The treatment plant was later improved in 1982 and 1994, with main additions consisting of another clarifier, new digesters and additional sludge drying bed area. The plant treats on an average 0.75 million gallons per day (MGD) and is at approximately 47% of design capacity. A condition assessment study of the plant in 2013 revelated that the plant needs major rehabilitation to contain increasing annual operation and maintenance costs and to eliminate the risks of catastrophic failure and possible TCEQ violation penalties. Disc aeration equipment in aeration basin (aeration basin is the "heart" of the treatment plant) is outdated and needs frequent maintenance, repairs, and replacement due to the aging. It is difficult to access and work on discs and bearings especially at the increased frequency due to aging. The gate valves and influent baffles in the headworks have rusted and are difficult to operate. Many elements in the clarifiers (gear box, bridge walkways, weirs, and baffles) have also deteriorated considerably. Maintenance of floating aerators, which were later added to the aeration basin to keep up with the needed treatment efficiency to meet TCEQ requirements are also adding up to increased cost of operation. The City's 2016 Water and Wastewater Condition and Capacity Assessment Studies concluded that the N.B. Davidson WWTP should be increased to a 2-hr peak flow treatment capacity from 4 million gallons per day (MGD) to 6.5 MGD. An increase in the 2-hr peak treatment capacity will prevent the collection system from surcharging during wet weather events and help the City maintain regulatory compliance. All questions regarding this solicitation should be directed by email to Lucy Gonzalez, Procurement Manager, at lgonzalez@huntsvilletx.gov. Questions may be submitted through 4:00 p.m., Wednesday, December 28, 2022. All questions after this timeframe will not be accepted. A response to the Questions will be posted by 4:00 PM, Wednesday, January 4, 2023. The method of contractor selection has not been determined at this time.
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