CCP 01-23-2006 - Laserfiche WebLink

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I I I I I I I I I I I I I I I I I I I RECOMMENDATIONS 1) Site Location and Condition A security fence around the immediate tank site should be considered to reduce the chance of contamination of the tank contents or vandalism. The cost of this fence (100' x 100' - 8' high) along with two access gates should not exceed $24,300. The ground around the tank's foundation should be graded so that the foundation projects 6 inches above grade with the slope of the grade away from the foundation. Areas with less than 6 inches of foundation projection adjacent to concrete sidewalks do not require grading repair. The cost of this alteration should not exceed $2,200. 2) Foundation The foundation was in good condition overall. The minor crack and pop-out should be considered normal for a tank of its age. As further degradation is not expected these items do not require repair. 3) Exterior Coating The exterior coating was in good condition overalL All areas of localized corrosion should be spot repaired in conjunction with the interior coating work. Specifications should require surface preparation in accordance with SSPC-SP 3 "Power Tool Cleaning" followed by two coats of an acrylic coating. The power tools used (e.g. needle gun, roto-peen, etc.) should be equipped with vacuum shrouds which would significantly reduce the containment requirements, Utilizing the shrouds, the only additional containment needed would be tarps placed upon the ground to catch inadvertent releases of paint debris. KTA's opinion of probable construction cost for spot repairs to the tank exterior should be approximately $13,500. If aesthetics are particularly important the tank could be overcoated. The surface preparation if overcoating is desired, specifications should require pressure washing all exterior tank surfaces in accordance with SSPC-SP 12, WJ-4 to remove dirt, debris, and chalking prior to the application of an epoxy penetrating sealer and urethane finish coat. The existing exterior coating is a urethane, which often requires mechanical sanding in addition to pressure washing to insure coating performance. Therefore, the cost to overcoat the tank exterior is substantial (approximately $98,000) and is not required at this time. Care should be taken during any exterior painting to avoid overspray or paint drips onto the cars in the parking lots adjacent to the tank site. Elevated Water Storage Tank City of Arden Hills South Tank 34