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<br />I <br />I <br />I <br />I <br />I <br />I <br />I <br />I <br />I <br />I <br />I <br />I <br />I <br />I <br />I <br />I <br />I <br />I <br />I <br /> <br />C, Exterior Evaluation <br /> <br />Exterior Coating <br /> <br />An examination of the exterior tank painted surfaces was made from the ground, <br />the roof, and the existing ladders. The exterior coating was in good condition overall. <br />Corrosion was found mainly on the tank roof, base plate, and around the circumference <br />where the vertical tank shell overhangs the tank bowl. Minor corrosion was also found <br />on the perforated metal screens of the riser vents. The coatings had good adhesion to the <br />steeL The coating system appeared to be a two-coat system. The primer appeared to be <br />white with an average thickness of 6 to 7 mils. The topcoat appeared to be blue with an <br />average thickness of 5 to 6 mils. The exterior coating system is providing adequate <br />protection for the steel, but areas of isolated corrosion should be touch-up painted within <br />the next 3 years. <br /> <br /> <br />Photograph 24 - Minor Coating Failure and Corrosion on Baseplate <br /> <br />Elevated Water Storage Tank <br />City of Arden Hills South Tank <br /> <br />23 <br />