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...Usace navfac afcec nasa ufgs february change august preparing activity superseding unified facilities guide specifications references are in agreement with umrl dated october section table of contents division water and wastewater equipment packaged treatment chg part general submittals maintenance material spare parts quality control manufacturer s representative regulatory requirements standard products list prior installations welding delivery storage handling project site conditions environmental warranty system description design package plant components systems concrete work manufactured units process chambers aeration chamber clarifier sludge holding disinfection structural for steel tanks page diffused air diffusers diffuser holder assembly mechanical drive impeller shaft shroud aerator supports walkways rails screening comminutor basket bar screen scum collection transfer pumps hopper bottom settling circular rectangular recirculation supernatant froth pump spray nozzles pipin...