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Termino Avenue Drain

Client: Los Angeles County Department of Public Works


Project Value: $21M

Project Description:  This project created a critical link to alleviate stormwater flooding in this area of Long Beach, which has been plagued for decades by serious flooding even during moderate storm events, often causing major property damage. The completed project gathers and transfers stormwater through an underground network of pipes, pre-cast box structures, and cast-in-place box structures, ultimately discharging into the seawater channel. The scope of work comprised 8,800 linear feet of 18- to 72-inch diameter reinforced concrete pipe (RCP), 6,300 linear feet of cast-in-place double reinforced concrete box and single reinforced concrete box, as well as precast reinforced concrete box with sizes measuring up to 20 feet wide by 10 feet high. Additional elements included constructing more than 100 new cast-in-place catch basins equipped with trash excluder screens and filtration, placing 1,100 linear feet of 72-inch diameter RCP via direct jack and bore; and constructing a 30-foot-deep low-flow diversion structure to divert non-storm-event-runoff-to the sewer system. The project utilized an extensive high-volume dewatering and treatment system to treat and recycle 8,900 tons of contaminated soil. Trench shoring consisted of both a sheet pile system and steel beams and lagging, a sheet pile cofferdam at the outlet in Marine Stadium, and environmental and biological measures such as noise monitoring, NOx compliance, and protection of marine life such as eelgrass, sea lions, and sea turtles.