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with a valve to regulate the rate of return. The scum intake will have an adjustment assembly that will enable exact positioning of the skimmer at water level. K. Chlorine Contact Chamber A chlorine contact chamber will be provided for proper disinfection of the treated wastewater prior to discharging from the plant. The chlorine contact tank will have 30 minutes of retention based on the design flow. Sufficient flow baffles will be supplied to ensure proper mixing of the chlorine solution with the plant effluent. A tablet style chlorinator feeder will be provided for use with Sanuril 115 tablets. L. Air Diffusion System An air distribution manifold constructed of rectangular hollow steel tubing with diffuser drop assemblies will be installed longitudinally on one side along the entire length of the plant. Each diffuser drop assembly will be equipped with an air regulation and/or shut-off cock valve, a disconnecting union and a diffuser bar with air diffuser nozzles mounted thereon. The diffusers will be parallel to and near the base of the vessel sidewall and at the proper elevation providing optimum diffusion and mixing of the vessel contents. Each air diffuser will be constructed with an integral air check diaphragm designed to handle a wide range of airflow. The oxygen transfer capacity of each diffuser will be such that an adequate supply of oxygen will be maintained in the aeration chamber to meet treatment requirements of the design sewage load. M. Blower/Motor Units To meet the air requirements of this wastewater treatment system, two (2) positive displacement blower/motor units will be supplied. The blower/motor units shall be mounted at a remote location as indicated on the plans. The blower/motor units will be capable of providing a minimum of 2050 cubic feet of air per pound of BODS plant loading. Each blower unit will be capable of delivering 78 CFM when operating at 5 PSI. The motor will be 5.0 HP, ODP type, for operation on 230 volt, 3 phase, 60 cycle service. Each blower/motor unit assembly will be mounted on a molded fiberglass base. The base structure will be adequately reinforced to support the blower/motor unit. The blower/motor will be enclosed within a molded fiberglass weatherproof hood mounted to the base. The fiberglass -locking hood is designed for easy access to service the unit. To help reduce blower vibration and noise, the blower/motor base will be mounted on