Laserfiche WebLink
3.7 Exterior 3.7.1 <br /> Structural <br /> Remove the existing vent and repair the opening in the roof plate by fillet welding a <br /> cover plate in the opening. Install a new 24-inch diameter frost-free aluminum <br /> mushroom vents with removable covers. The existing vent and venting around the <br /> drywell tube do not meet AWWA D100 and local health department regulations.The <br /> new removable vent will improve ventilation and aid in compliance with OSHA <br /> confined space regulations during reconditioning. See Photo 39 and BSI Drawing No. <br /> 6. <br /> Remove the lower plate that is bolted to the drywell tube access cover. See photo <br /> 40. <br /> Replace the steel roof access manway cover at the top dry well tube with an <br /> Aluminum cover and with a stop mechanism. See Photo 41. <br /> Remove the existing 12'-6" diameter roof hand rail and install a 24' diameter pipe <br /> hand railing. See BSI Drawing# 14 and photos 42 and 43. <br /> Install a new style LED obstruction light and stand. The new aviation obstruction light <br /> should be mounted higher than the highest antenna. <br /> Replace the overflow pipe screen. See photo 44. <br /> Install a welded Nameplate T-Bracket to relocate the nameplate. <br /> After reconditioning, replace all damaged, lose or missing concrete grout under the <br /> base plate with non-shrink 3000 PSI grout. <br /> 3.8 Exterior 3.8.1 <br /> Coating <br /> The original coating is now 25 years old, it has been over coated twice and last spot <br /> repaired in 2014. The exterior coating is not classified as a lead base paint. However, <br /> it is in poor condition. <br /> Due to age, chalking, and deterioration, the entire exterior coating is not repairable <br /> and should be removed and replaced within the next 1 to 2 years with a <br /> zinc/epoxy/urethane coating system. See photos 45 thru 50. <br /> The exterior coating is not classified as lead or chromium-based paint. However, due <br /> to general location, removing it using conventional open air-dry abrasive blasting <br /> methods will cause environmental problems with visible air emissions and fugitive <br /> particulate matter. Reconditioning specifications must be designed to be in <br /> compliance with local, state and Federal regulations and will require full exterior <br /> containment. <br /> 9 <br /> 136 <br />