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C. Pumps used for the removal of bottom sediment and <br />water shall be explosion proof. Shovels used to <br />remove solid sludge shall be of the non-ferrous or <br />sparkproof type. <br />D. The interior tank surfaces are to be sandblasted to <br />a white metal finish. The shovels used to remove <br />the residue shall be sparkproof as in III. C., <br />above. All corrosion, scale, sand and dirt must be <br />removed. Sandblasting, removal of sand and scale <br />and wiping, are to be scheduled for one continuous <br />operation. <br />E. Holes are to be located and plugged with boiler <br />plugs, base resin, trowel material and reinforced <br />with glass. Seams are to be filled with trowel <br />material to give a smooth, rounded, covered surface <br />for better application of the spray coat. <br />IV. APPLICATION <br />A. The coating resins should be applied immediately <br />after the sandblasting operation is completed, but <br />application must begin no later than 16 hours <br />following and before any visible rusting occurs. <br />If visible rusting is apparent, additional surface <br />preparation will be required up to and including <br />resandblasting, at the discretion of the engineer <br />supervising the work. <br />B. The final spray coat is to average 150 mils thick <br />and in no case, less than 125 mils, and is to be <br />free of runs, pin holes or other defects. <br />V. INSPECTION <br />A. The Contractor is to notify Owner of the scheduled <br />starting time for the application process so that, <br />if desired, an inspection of the sandblasted <br />surface can be made. <br />B. The Contractor is to notify Owner of the time <br />scheduled for closing the tank, so that an <br />inspection of the coated surface can be made. <br />Page 5 <br />