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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 31- Platform to Access Tuhe <br /> <br />The results of the total system dry-film thickness measurements from various <br />locations on the interior of the tank pedestal are summarized in the following table. <br /> <br />Area DFT Range (mils) DFT Average (mils) <br />Interior Pedestal 9.1 to 16.0 13.3 <br />Top of Condensate Ceiling 13.8 to 20.9 16.9 <br />Interior Access Tube 7.9 to 12.5 8.6 <br />Exterior of the Bowl 4.7 to 18.5 9.8 <br /> <br />A SOX microscope was used to examine the substrate in random areas to <br />determine if mill scale, intercoat contamination, voids, underlying rust, mill scale, and/or <br />pinholes existed. The substrate appeared to be blasted and free from any of the fore <br />mentioned conditions. <br /> <br />The adhesion of the coatings on the interior dry surfaces of the tank was found to <br />be good (4A to SA). The coating system appeared to have two coats, a beige primer and <br />a white topcoat. <br /> <br />Elevated Water Storage Tank <br />City of Arden Hills South Tank <br /> <br />30 <br />