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(20) City will have one SCADA antenna positioned on roof of tank at all <br />times during project. This antenna controls water level in all City tanks <br />and is controlled by building located near leg ladder. After shroud <br />support center tree is installed, contractor will move SCADA antenna to <br />top of shroud support center tree where it will remain until shroud is <br />removed. Antenna is omni-directional and may be moved to facilitate <br />work but must remain operational during project. Once shroud is <br />removed, contractor will move SCADA antenna to permanent location <br />on roof handrail. Owner will run coax wire for SCADA antenna in new <br />pipe conduit installed by contractor as part of project. <br />(21) Grind welded lugs on structure smooth, including old ladder lugs, old <br />rigging clips and shroud clips. New shroud clips shall be ground <br />smooth, blasted and painted per the exterior coating specification after <br />containment has been removed. <br />(22) Optional Work Item: At contractor's own expense, holes may be cut in <br />tank's roof plate to provide rigging ports for interior of tank. If holes are <br />cut, weld one 2 diameter threaded pipe coupling in each hole. Blast and <br />paint couplings as part of exterior work. Close holes at end of job with <br />galvanized coated threaded plugs. Submit number of holes proposed <br />and methods to cut and close to Engineer for approval. <br />(23) Provide and install new stainless steel nuts, bolts and neoprene gaskets <br />in all manways after interior paint has cured. Do not paint stainless steel <br />nuts and bolts. <br />4. REPAIR OF PITS & PRIOR CORROSION DAMAGE <br />After abrasive blast cleaning, Engineer's Field Representative will inspect the steel <br />surface to determine the repair procedure. The repairs may be made by using epoxy <br />paste or by welding as directed by the Engineer' Field Representative. Those pits deeper <br />than 1/8" will be repaired by welding. Pits less than 1/8" deep will be repaired with <br />epoxy paste. Epoxy paste shall be applied after the zinc rich primer has been applied <br />per the appropriate coating specification in this document. <br />Repair all deep pits by welding pit flush with surface of tank. Average size of deep pits <br />is 1" diameter x 1/8 deep. Repair all shallow pits by filling with 100% solids epoxy <br />Tnemec pit filler. Average size of shallow pits is 1" diameter x less than 1/8" deep. <br />Assume 200 deep pits to be repaired by welding, and 2 gallons of epoxy pit filler to <br />repair shallow pits in base bid. Additive bid item below shall be utilized if additional <br />repairs are required: <br />SW-5 <br />436 <br />