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 5 3.2.2 After structural repairs are completed, all the reservoir surfaces should be abrasive blasted to an SSPC-SP-10 Near White Metal Blast and coated with a zinc/epoxy system (similar to the Tnemec Series 91- H20 Hydro-Zinc/Series N140 Pota-Pox Plus Epoxy coatings). 3.3|Cathodic Protection System (C.P.) 3.3.1 The reservoir does not have a Cathodic Protection system, and one is not required if the coating is applied and maintained properly. 3.4|Exterior Structural The following structural repairs are not required to be performed at this time and can be delayed until exterior coating repairs are required. 3.4.1 Remove both finial vents, patch the hole on the off-set 24-inch vent with a ¼-inch plate butt welded inside and out, grind all welds smooth. See photo 21. 3.4.2 Install a new finial vent with a 24-inch diameter aluminum pressure pallet style vent at the center of the tank, similar to the one shown on KLM Drawing No. 8a. See photo 21. The new vent and vent screen design should meet AWWA D100-11 and local Health Department Regulations. The removable top will improve ventilation, provide access to the tank interior during reconditioning, and aid in compliance with OSHA Confined Space Entry Requirements. 3.4.3 Remove and replace the handrail on both sides of the roof ladder and cross angles with an angle style handrail conforming to OSHA regulations. Remove the upper section of the roof ladder. The roof ladder is not required unless the roof slope exceeds a 5 in 12-inch slope. Install a non-skid walkway within the area of the hand railing. See photos 25 and 26 and reference KLM Drawing No. 14a. 3.4.4 Remove the approximately 32 pairs of containment tabs on the roof, grind all areas smooth and flush with the roof plates per Appendix C. See photos 24 through 26. 3.4.5 The existing balcony handrail does not meet OSHA requirement for a mid-rail/toe board, there are antenna braces causing trip hazards and access from the leg ladder to the balcony is difficult and unsafe. Replace the handrail in its entirety and provide an opening for the access ladder to grade meeting OSHA requirements. See photos 32, 33, 35 and 36 and KLM Drawing No. 27. 3.4.6 Replace all the exterior ladders not meeting current OSHA requirements for width and rail size with new OSHA compliant ladders complete with cable style 24 and photos 27, 35, 43 and 46. 3.4.7 Install a hinged, locking cover over the lower 8 feet of the ladder. This will restrict access by unauthorized personnel. Refer to photo 46 and KLM Drawing No. 20. 3.4.8 Install one (1) 24-inch diameter shell, pressure style manway in the bottom section of the wet riser, 180 degrees from the existing manway. This will improve the ventilation during reconditioning and bring the tank into compliance with OSHA Confined Space Entry requirements. See KLM Drawing No. 37a and photos 44 and 45. 3.4.9 Replace the existing overflow pipe screen with a corrosion-resistant, heavy-gauge #4 mesh screen, the existing is partially plugged. See photo 48.