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C, Surface Preparation and Coating <br />All vessel surfaces to be painted will be properly prepared in a workmanlike manner so as <br />to obtain a smooth, clean and dry surface. All rust, dust, and mill scale, as well as other <br />extraneous matter, will be removed from the interior surfaces by means of near white <br />sandblast SSPC-SP10. All external surfaces will be commercial sandblasted to <br />SSPC-SP6. All interior and exterior vessel surfaces will be painted with 8-10 mils total <br />dry film thickness (TDFT) of a black coal tar epoxy type coating. <br />D. Inlet Bar Screen <br />A bar screen will be provided at the influent port to remove any unusually large solids from <br />the incoming raw sewage. The bar screen will be fabricated from 1/2" diameter bars <br />spaced 1" apart and arranged as shown on the drawings. The bars shall be sloped to <br />permit easy cleaning of accumulating debris. A deck will be furnished for drying this <br />debris. The bar screen shall have the same protective coating as specified for the plant. <br />E. Flow Equalization Chamber <br />A flow equalization chamber will be supplied with a volume designed to handle 25% to <br />100% of the daily design flow. The flow equalization chamber allows for a constant flow <br />through the plant by equalizing flow surges that may be incurred during peak flow times. <br />Flow control will be accomplished by pumping the plant influent to a flow control box <br />containing an adjustable overflow broad weir and a v -notch discharge weir. The <br />overflow broad weir will be adjustable so that a measured amount of pumped influent will <br />discharge through the V -notch weir to the aeration chamber, while recycling the <br />remaining pumped influent back to the equalization chamber. <br />A duplex set of equalization pumps will be furnished and installed within the chamber. <br />The pumps will be rated 1/2 HP, 230 volt, 3 phase, and 60 cycle. An emergency <br />overflow will be provided between the equalization and aeration chamber. <br />A blower/motor unit mounted in a fiberglass housing will be supplied to meet the air <br />requirements of the equalization chamber. The blower unit will be capable of delivering <br />20 CFM when operating at 5 PSI. The motor will be 1 HP, ODP type for operating on 230 <br />volts, 1 phase, 60 cycle service. Liquid level sensors will regulate the pumps and <br />blower/motor unit. Controls will be provided in the plant control panel. <br />F. Sludge Holding Chamber <br />The chamber will be of the aerated type. The volume of the sludge holding chamber is <br />based on 3 cu. ft. per capita. Diffused air will be supplied by the plant blower system <br />supplying 30 CFM of air per 1000 cubic feet of volume. The diffusers will be located <br />parallel to and near the bottom of the tank. All piping and valves in the chamber will be <br />factory installed. A fixed supernatant decant pipe will be provided within this chamber. <br />P6018 west Lane MHP 2 <br />