25B - AGMT STORMWATER LIFT STATION

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PPOPOSAL?n Civic CenterStormwowLfftStationRenovctfon DasignServicas • Instrumentation: Remove the existing bubbler level Instrument and install new pressure transducer. Float switches will be provided as back-up to the new pressure transducer. Install an intrusion switch to notify the City when the hatch door is open. Flower Pump Sfaflon Upgrades The Flower PS operates during a stone to prevent flooding of the parking lot near the intersection of Flower Street and Sixth Street. The pump station is a vertical concrete structure with a metal grating separating the lower wet well from the upper level that houses the electrical equipment. The existing pumps are 10 hp and 20 hp axial flow pumps, and are driven by electric motors. During a storm, water cascades through the floor grating and into the wet well, and the grating serves as a coarse screen for debris. During the 2016 site visit, Michael Baker noted a significant amount of debris and trash was present on the grating and within the wet well. In addition to the debris, Michael Baker noticed that the wet well was completely full, although electricity was being provided. This could Indicate that the control system is not operating as intended, The proposed upgrades at the Flower PS include: • Pump and motor replacement: Remove existing horizontal -axial pumps and replace with explosion proof submersible pumps installed on guide rails. • Piping and valve replacement Remove and replace the existing piping and valves. • Structural Improvements: Modify the existing structure to accommodate the submersible pumps, Including adding structural reinforcement, safety rail, and access hatches. Patch the existing concrete structure including roof hoist. Remove and replace existing metal grating, the new grating will cover the entire floorspace. • Site & drainage improvements: Modify local site grading and install a Continuous Deflection System (CDS) Stormwater Treatment Unit to capture debris before it enters the wet well. The CDS unit will decrease maintenance requirements for debris removal, and will better prevent debris from reaching and potentially clogging the pumps. • Electrical Improvements: Remove the existing electrical equipment and replace with outdoor NEMA 3R NEC compliant electrical equipment. Replace remaining electrical equipment within pump station (lighting, receptacle, etc.) with Class 1 Div 2 rated equipment. Seal conduit penetrations to the pump station and provide explosion proof conduit fittings to comply with NEPA 820 requirements. • SCADA: Install a new NEMA 4X Remote Terminal Unit similar to the unit at the Santa Ana PS Including a Yagi directional antenna. The new RTU Panel will provide monitoring and alarming signals to the City s SCADA. • Instrumentation: Remove the existing level instrumentation and install new pressure transducer and back-up float switches. Install an intrusion switch to notify the City when the hatch door is open. i•r[aeanoxu• a 25B-30