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Remove all erection bracket scab marks below the HWL by air arc gouging, cutting <br /> torch, or grinding. There are approximately 100 erection bracket scab marks. Repair <br /> the tank surface by welding and grinding. This will require approximately 40-man <br /> hours of welding and grinding. <br /> Grind off all weld spatter below the HWL. This will require approximately 30-man <br /> hours. <br /> ...................... <br /> 3.2 Interior Wet 3.2.1 <br /> Coating The coating Dry Film Thickness (DFT) on the roof openings varies from 9.9 to 24.3 mils <br /> with average of 14.2 mils DFT. <br /> The coating Dry Film Thickness (DFT) on the roof structural members varies from 12.5 <br /> to 24.8 mils with average of 16.8 mils DFT. <br /> The coating Dry Film Thickness (DFT) on the roof plates varies from 14 to 20 mils with <br /> average of 15 mils DFT. <br /> The coating Dry Film Thickness (DFT) on the shell plates varies from 12 to 23 mils with <br /> average of 16.5 mils DFT. <br /> The coating Dry Film Thickness (DFT) on the exterior of the drywell tubes varies from <br /> 14 to 25 mils. <br /> The interior coating is in poor to fair condition. The coating is now 25 years old and <br /> because of age is not considered repairable. The interior wet coating should be <br /> replaced within the next 1 to 2 years. See photos 13 through 24. <br /> After structural repairs are completed,the entire reservoir surfaces should be <br /> abrasive blasted and the coating replaced with a zinc primer and a 2-coat epoxy <br /> coating system. <br /> 3.3 Cathodic 3.3.1 <br /> Protection(C.P.) Currently the tower does have a submerged cathodic protection (C.P.) system inside <br /> System the tower. Presently it appears not to be working. BSI recommends to remove the <br /> complete C.P. system from the tower, remove the entrance coupling through the <br /> drywell tube and seal weld interior/exterior a plate over the opening, and including <br /> the control box at the base of the tower. See photo 25 <br /> 3.4 Water 3.4.1 <br /> Stagnation and Currently the tower does not have a water stagnation system. BSI is suggesting <br /> De-Icing System installing a SolarBee GS-9 unit, located on the bottom of the floor between the <br /> (SolarBee GS-12) drywell tube and the cone plates.The SolarBee unit will also aid in minimizing the <br /> formation of ice inside the tower which can damage the coating system. See Solar- <br /> Bee GS-9 Brochure. <br /> 7 <br /> 134 <br />