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9 <br />3.5.2 The coatings in the drywell tube, on the bowl exterior, the top 2 -feet of <br />the fluted support column, the catwalk floor, the top side of condensate <br />ceiling, the valve pit piping, and random coating failures should be <br />abrasive blast to an SSPC-SP 6 Commercial Blast Clean within one to <br />two years and replaced with a zinc/epoxy coating system similar to the <br />Tnemec Series 91-H20 Hydro-Zinc/Tnemec Series N140 Pota-Pox Plus. <br />3.6 Exterior Structural <br />3.6.1 The existing roof vent appears to provide inadequate ventilation as it has <br />only a partially open screening area. Replace the tank vent/finial with a <br />24 -inch diameter frost -free pressure pallet vent with a removable top, <br />similar to the one shown on KLM Drawing No. 37. See photos 41 and <br />42. The new vent and vent screen design should meet AWWA D100-11 <br />and local Health Department Regulations. The removable top will <br />improve ventilation, provide access to the tank interior during <br />reconditioning, and aid in compliance with OSHA Confined Space Entry <br />Requirements. <br />3.6.2 Install three (3), 24 -inch diameter round, hinged cover, roof ventilation <br />manways; two located near the roof edge approximately 180 -degrees <br />from each other and one adjacent to the new intermediate painters' rail. <br />These will provide additional ventilation during the interior surface <br />preparation and coating, access to the painters' rail, and aid in <br />compliance with OSHA Confined Space Entry requirements. See KLM <br />Drawing No. 25. <br />3.6.3 Additional structural items are included in Section 3.9, <br />Telecommunications Considerations, as they relate to the <br />telecommunications installations on the tower. <br />3.7 Exterior Dry Coating <br />3.7.1 The tower was built and the exterior, with the exception of the roof, was <br />last coated in 1992. According to the owner's records, the coating on the <br />roof was completely replaced in 2012. The exterior coating appears in <br />good to excellent condition, with less than two percent overall coating <br />failures with these failures randomly located. While the coating is now <br />22 years old and has achieved its intended service life, its condition <br />indicates that it has the ability to provide adequate corrosion protection <br />for an additional five to seven years. However, to facilitate interior <br />coating replacement and structural modifications, spot coating repairs <br />will be required in conjunction with the interior coating replacement. <br />The remainder of the tower should be reinspected and reevaluated in <br />three to five years to determine when exterior coating replacement will <br />be required. See photos 41 through 50. <br />