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Civic Center tormsraterLift.6totionRenovationDesignSery€ms • Identify the preferred upgrade solution(s) based on financial and O&M considerations. • Evaluate shutdown limitations and construction sequencing Key items regarding the project approach are electrical safety and maintenance convenience and providing protection of electrical equipment against harsh environment and sun exposure. Michael Baker will meet with the City to develop a detailed sequence of work and coordinate and finalize shutdown constraints (including duration). Sequence of work will address the fallowing: + Cooperation between contractor and City personnel • Dates and durations of construction and all shutdowns to be approved in advance by City in order to prevent flooding. Following sections described specific upgrades and Issues for each pump station. Santa Ana .Pump Station The Santa Ana PS was constructed in 1963 as part of the Civic Center Construction Program, and operates during a storm to prevent flooding of the parking structure and southern walkways. The pump station Is a vertical concrete structure with a concrete slab separating the lower wet well from the upper dry well. The dry well is set three feet below grade and houses three pumps and the electrical equipment; the pumps are 60 horsepower (hp), 30 hp, and 18 hp and are driven by electric motors, and the 60 hp pump and motor were replaced in 2016. After thorough review of the existing documents and Scope of Work, Michael Baker has identified the following proposed upgrades to the Santa Ana Pump Station. + Pump and motor replacement: remove and replace the two (2) older pumps, and keep the larger pump installed in 2016. Replace all three (3) of the existing pump motors with explosion proof motors. • Sump pump replacement: Remove the existing sump pump and replace with a %: hp explosion proof, solids handling sump pump. • Piping and valve replacement: Remove and replace the existing piping and valves in kind. • Structural improvements: Patch the existing concrete structure, seal penetrations, and provide gasketed roof seals. Remove and replace the metal enclosures over isolation valves. • Mechanical Improvements: Install a new HVAC system and seal openings between the wet well and dry well to declassify the dry well and comply with NEPA 820 requirements. • Electrical improvements: Remove and replace the existing electrical equipment to comply with NEC and NFPA 820 requirements. • SCADA: The existing RTU Panel, which provides monitoring and alarming signals to the City's SCADA system, will remain as is. Re -wire and re -terminate the wiring to and from the RTU panel as required. M1ulrtaoYOaker;