CC WORKSESSION PACKET 06082021 - Laserfiche WebLink

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TOWER NUMBER ONE CITY OF ST. ANTHONY, MINNESOTA Copyright 2020 by KLM Engineering, Inc. Page 6 3.5|Exterior Coating 3.5.1 The exterior coating is in fair to poor overall condition with approximately twenty (20) percent visible coating failures observed throughout the structure. The coating failures consist mainly of topcoat delamination primarily on the roof and bowl. Failures of this type will continue to occur due to age and normal deterioration exposing the underlying coatings to UV deterioration. Failures also include isolated pinhole corrosion, and typical coating damage on wear areas like handrails and ladders. See photos 21 through 47. 3.5.2 After structural repairs are completed, all the reservoir surfaces should be abrasive blasted to an SSPC-SP-6 Commercial Blast Clean and coated with a zinc/epoxy/urethane/fluoropolymer system (similar to the Tnemec Series 91-H20 Hydro-Zinc/Series N140 Pota-Pox Plus Epoxy/Series 73 Endurashield/Series 701 Hydroflon coatings). 3.6|Site and Environmental Considerations 3.6.1 The site includes the tank and an antenna building enclosed in a chain link fence mowed grass site. The site is adjacent to a play area near the middle school. There is a fire hydrant on the site. 3.6.2 In conformance with Minnesota state rules, an analysis has been performed to determine the methods of pollution control required for this storage structure during reconditioning. To maintain air quality and to prevent the drift of dust and fugitive emissions, full containment will be required, including impervious ground cover, a top cover or bonnet and negative air dust collection. 3.7|Telecommunications Considerations 3.7.1 The tower has some telecommunications equipment, including antennas, coaxial cables, support brackets and other miscellaneous equipment. The Owner is advised to maintain accurate records of each of the antenna sites on the tower, including As-Built Drawings, site manager and owner contact information, upgrades performed, and future plans for antenna installations or upgrades. These records will help facilitate the future reconditioning with a minimal 3.7.2 Working around and protecting the telecommunications equipment, including antennas, coaxial cables, support brackets, and other miscellaneous equipment during future reconditioning will incur additional costs. The antenna owner(s) should be responsible for these expenses under clause(s) in the antenna lease agreements. These costs are not included in the Engineer tower to tower. 3.7.3 Prior to reconditioning, in accordance with the lease requirements of each antenna owner, the City of St. Anthony should notify the telecommunications owners or manager of the work to be performed. The City should also determine whether: a) the antenna owners will pay the additional costs to work around and protect the antennas; b) the antenna owners will temporarily remove their antennas and associated equipment to facilitate reconditioning; or c) the City will have to pay for these costs themselves. 4.0|REPAIR AND RECONDITIONING OVERVIEW 4.1|Repair and Reconditioning Cost Estimate The costs for structural repairs and replacing the interior and exterior coatings are estimated between $610,000 and $640,000. This estimate is based on current pricing and does not include costs for engineering and/or inspection services. For competitive bids, the project should be bid 9 to 12 months before the desired starting date. An experienced tank-coating contractor with the proper crew and equipment should be able to complete the project in eight (8) weeks. At the time of reconditioning, the tower will need to be drained and remain off-line during interior