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 DISCUSSION OF OBSERV A nONS A, Site Location and Condition The immediate tank site was not fenced to protect the tank from vandalism or possible contamination of stored water. Although the tank's design somewhat limits access to the roof, a cbain-link fence surrounding the site should be considered if additional security is desired. All future site maintenance should be directed away from the tank to minimize the possibility of flying debris; such as, loose stones striking the tank surface. B. Foundation The existing concrete foundation supporting the fluted column was inspected for spalls and cracks. The foundations appeared to be in good condition with only one minor surface cracks documented. The crack was located 4' to the right of the overflow pipe outlet. No repair to the crack is warranted. The foundation also had one small pop-out. A pop-out differs from a spall in that spalls are usually caused by corrosion of the reinforcement or infrequently due to contaminants in the concrete. Pop-outs are formed as the water in saturated coarse aggregate particles near the surface freezes, expands, and pushes leaving a shallow pit. The minimum foundation projection recommended by A WW A of 6" was not met for a portion of the tank both in locations where the foundation was adjacent to concrete sidewalks and adjacent to grass covered grade. The minimum projection recommendation reduces the chance of accelerated corrosion due to dirt and vegetation trapping moisture next to the baseplate and pedestal. i Photograph 23 - Pedestal Door - Note Poor Foundation Projection on Right Hand Side of Photograph Elevated Water Storage Tank City of Arden Hills South Tank 22