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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 /> <br />Photograph 28 - Tank Vent Screen <br /> <br />D, Interior Evaluation <br /> <br />Interior Wet Coating Evaluation <br /> <br />The interior tank coatings were in good condition. Only three areas of isolated <br />corrosion were documented during the inspection. These areas were generally small, <br />ranging in size from approximately 1" to 4" in diameter. The coating in these areas was <br />failing to the steel substrate. No pitting or loss of plate wall section had taken place. <br />Overall, the total amount of isolated corrosion on the interior of tank container was <br />estimated to be less than 0.3% of the interior surface area. Minor corrosion and rust <br />staining was found along the roof rafter edges and the stitch welds which join the roof <br />plates to the rafters. The joint between the roof and vertical shell wall, the tank's <br />overflow weir box, and the erection plates attached to the access tube also had minor <br />corrosion and rust staining. <br /> <br />Elevated Water Storage Tank <br />City of Arden Hills South Tank <br /> <br />27 <br />