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ATTACHMENT 1 <br /> WORK ORDER NUMBER 05 <br /> TO 2004 PROFESSIONAL SERVICES AGREEMENT <br /> FOR <br /> EXPANSION OF WEST REGION WWTF <br /> INDIAN RIVER COUNTY <br /> I. General <br /> The existing West Region WWTF is a two- stage BNR plant designed around the Kruger <br /> A/O ditch process . The first stage was designed as a fermentation tank for phosphorus <br /> removal . The plant also has RAS denitrification capabilities using some of the tankage <br /> from an older plant that is no longer in use . <br /> Existing Treatment Process Flow Diagram <br /> Anaerobic Aerobic <br /> Anoxic RAS WAS <br /> Current Plant Process Schematic <br /> The RAS denitrification process is not being operated as intended and partial <br /> denitrification is being achieved in the existing "ditch" . A brief description of the <br /> existing plant is as follows : <br /> • Preliminary treatment consisting of screening and grit removal <br /> • A 116 ,000- gallon , four compartment anaerobic fermentation tank equipped with <br /> four mixers <br /> • A 1 . 5 MG oxidation ditch ( 15 ' SWD) equipped with three two speed 60/40 <br /> horsepower brush aerators , two submerged propeller mixers , and a motor operated <br /> effluent weir <br /> • Two 70—foot diameter by 12—foot deep secondary clarifiers fed from an influent <br /> splitter box <br /> • A two compartment RAS denitrification tank equipped with four submersible <br /> mixers <br /> • A traveling bridge effluent filter <br /> • Dual chlorine contact chambers <br /> • Two RAS pumps and one WAS pump <br /> • Chemical feed systems for alum and sodium hypochlorite <br /> • An off line equalization basin <br /> • Two , 116 , 000 gallon , aerated sludge holding tanks <br /> IRC West WWTF Scope Page 1 6 13/2005 <br /> CADocuments and SettingAkdonlevy\Local SettingATemporary Internet Fi1es\0LK20ffWTPEXPNASI0N Design Scope-Rqj Revised by RRM .doc <br />