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from 0%to 150% of the design flow. The airline supplying air to the pump will be <br /> equipped with a valve to vary the amount of air supplied to each pump, thus varying the <br /> capacity of the pump. The airlift pump will be firmly supported and will be equipped <br /> with a clean out plug to allow for easy cleaning and maintenance. <br /> Scum Recirculation System: <br /> There will be installed within the clarifier chamber a positive scum and skimming <br /> recirculation system consisting of one (1) airlift skimming device located in a position to <br /> skim and return floating material to the aeration chamber. The airline supplying air to <br /> the skimming device will be equipped with a valve to regulate the rate of return. The <br /> scum intake will be equipped with an adjustment assembly, which will enable exact <br /> positioning of the skimmer at water level. <br /> Chlorine Contact Chamber (Disinfection Chamber): <br /> A chlorine contact chamber will be provided for proper disinfection of the treated <br /> wastewater. The chlorine contact tank will have a minimum of 60 minutes retention <br /> based on average daily flow. Sufficient flow baffles will be provided to ensure proper <br /> mixing of the chlorine solution with the plant effluent. <br /> De-Chlorination Chamber: <br /> A de-chlorination contact chamber will be provided following the chlorination chamber <br /> and prior to discharging from the plant. The tank will have a minimum of 50 minutes <br /> retention based on the average daily flow. Sufficient flow baffles will be provided to <br /> ensure proper mixing of the de-chlor solution with the plant effluent. A tablet feeder <br /> will be provided. <br /> Air Diffusion System; <br /> An air distribution manifold consisting of a rectangular hallow steel tube is installed <br /> along the entire length of the plant. The manifold will feed a series of diffuser drop <br /> assemblies. Each diffuser drop assembly will be equipped with an air regulation and/or <br /> shut off valve, union and an air diffuser header. The diffusers will be parallel to and <br /> near the base of the vessels sidewall, at an elevation which will provide the optimum <br /> diffusion and mixing. <br /> Blower/Motor Units (Blowers to be installed in separate control room): <br /> One (1) positive displacement blower/motor unit will be supplied for the equalization <br /> chamber. The blower/motor unit will be capable of providing a minimum of 1.25 <br /> Page 6of11 <br />