Rehabilitation of the groundwater treatment plant’s filter gallery valves
Background
Long Beach Utilities Department (LBUD) has contracted LEE + RO to provide Construction Management and Inspection Services for the Groundwater Treatment Plant Filter Gallery Valve Rehabilitation Project Phase 1, located at 2950 Redondo Avenue in the City of Long Beach. The plant is rated at 62.5MGD and treats pumped groundwater prior to it being introduced into the potable water distribution system. The conventional water treatment plant includes sedimentation, flocculation, chlorination, and filtration processes.
The filtration process includes ten (10) filters. Each filter is composed of filter effluent, filter backwash, filter to waste, and air scouring systems. These systems include seven (7) butterfly valves, ranging from thirty-six inches (36”) to twelve inches (12”) in diameter. The project also involves installing two additional fourteen-inch (14”) diameter air-scouring valves to isolate each side of the filter beds.
Situation
The Project is time-sensitive and requires extended work hours and coordination with plant personnel and other contractors onsite throughout the project, particularly during the four (4) weeks of plant shutdown in March and April of 2024.
Scope of Work
LEE + RO’s construction manager (CM) closely monitors the progress to ensure that the work schedule for any given date is completed or if the work begins to lag, that the contractor has the resources to add more manpower and equipment to ensure completion of the scheduled tasks during the full plant shutdown. During this period, the biggest challenge for the scheduled work was identifying and assessing additional areas requiring repairs that could not be identified during the design phase, since they could not be accessed or exposed to evaluate present conditions until construction activities commenced.
The services include Project Management, Construction Engineering Support, Construction Inspection, and Coordination of Shutdown and Startup of Facilities.
