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I REQUEST FOR PROPOSALS <br /> General Contractor/Construction Manager Services for <br /> Water Pollution Control Facility Expansion-Phase C <br /> 300 hp Final Effluent Pump with VFD control will be provided <br /> in the existing South Effluent Pump Station. <br /> 2. Phase C2 (Solids Handling): <br /> a. The Solids Handling Improvements will include modifications <br /> to the existing Primary Sludge Pump Station, a Waste <br /> Secondary Solids (WSS) Thickening Facility, a Digester <br /> Control Building and an anaerobic digester. The WSS <br /> Thickening facility will consist of a concrete pile supported <br /> structure approximately 50 feet by 80 feet. This facility will <br /> incorporate two Solids Storage Tanks, three WSS Pumps, <br /> three Rotary Drum Thickeners with flocculation tanks, and <br /> three Thickened Waste Secondary Sludge (TWSS) pumps. <br /> Polymer feed equipment will also be included in this facility. <br /> For this phase, one 110 foot diameter Anaerobic Digester <br /> will be constructed with a sidewater depth of approximately <br /> 37 feet. The concrete base will be pile supported and <br /> provided with prestressed concrete walls and a domed <br /> concrete cover. Mixing of the Anaerobic Digester will be <br /> provided by four draft tube mechanical mixers. The Digester <br /> Control Building will consist of a concrete pile supported <br /> structure approximately 40 feet by 80 feet, with one level <br /> below grade and also include equipment mounted at the roof <br /> level. The Digester Control Building will include a hot water <br /> system consisting of two boilers, hot water pumps and heat <br /> exchangers. The boilers will normally be fired with methane <br /> generated in the anaerobic digestion process. Sludge <br /> pumping equipment will include three Sludge Recirculation <br /> Pumps. <br /> b. Along with the Solids Handling Improvements, a <br /> Cogeneration Facility is proposed. This will include gas <br /> treatment for the gas from the anaerobic digester and a <br /> 1,000 KW engine generator system to generate electrical <br /> energy from the methane produced in the anaerobic <br /> digestion process. The waste heat from the engine <br /> generator system will be used to heat the sludge within the <br /> digester. The building for the cogeneration equipment will <br /> be approximately 70 feet by 70 feet and pile supported <br /> similar to the other structures. <br /> City of Everett Page 7 April 16, 2012 <br /> Water Pollution Control Facility Expansion-Phase C <br /> 10 <br />