The existing 6 million gallon above grade tank was built in 1968. The tank has undergone major rehabilitation three times, mostly recently in 2011 when roof beams were replaced, roof plate was patched, and the tank interior was recoated. The abrasive blasting on the roof plate resulted in opening some holes in the roof plate surfaces. These holes were appropriately repaired by welding patch plates to the roof. The tank is currently experiencing rusting of the roof plate. These rust spots are originating from the inside of the tank and are corroding outward through the roof plate. The accelerated corrosion in these areas is common to this type of tank. Additionally, higher chlorine levels accelerate the corrosion of tank coatings and structural steel. The City is currently patching the holes to protect the water quality by applying steel patches to the roof with epoxy. Epoxy patches or more extensive welding repairs are only temporary and a roof replacement would have a limited life and be approximately one-half of the cost of full tank replacement. The recommendation is to replace the existing tank with a post-tensioned concrete tank that will minimize combined construction and long term maintenance costs. This project includes the demolition of the existing steel tank and undersized piping; and the construction of a new 6 to 8 million gallon above ground concrete storage tank and associated appurtenances as site constraints and permitting allows. Construction is funded with the replacement of the existing storage volume shown in the water operating fund and the additional storage volume shown in the water construction fund. A feasibility study for the tank replacement is being completed with WTR189, Nelson-Flanders WTP Expansion, to evaluate alternative locations for the tank and alignments for a redundant effluent line from the treatment plant site. This project is included in the city's 2022-2026 Capital Improvement Plan (CIP) and is allocated for 2022, 2023, and 2024. As of March 24, 2022, further details regarding design and construction have not been identified. *Project information has been obtained through a public capital improvement plan (CIP). A CIP is a financial schedule for short- and long-range projects which is updated regularly. Information listed in the CIP often evolves based on funding availability and the project details, including timeline and value, are subject to change. The content management team will continue to pursue additional details as they become available.
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