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What is the purpose of the West Area CSO Storage Tunnel Project?

April 26, 2017project purpose west area cso storage tunnel

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What is the purpose of the West Area CSO Storage Tunnel Project?

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The West Area Combined Sewer Overflow (CSO) Storage Tunnel project is one part of a comprehensive plan for long-term control measures to bring the City’s combined sewer system into compliance with water quality standards. This tunnel is part of a storage and treatment alternative that involves capturing and storing overflows from combined sewers that result from rainfall. The overflows are stored in large underground tunnels. When the rainfall is over, the captured CSO volume is conveyed to a separate treatment system for removal of pollutants and disinfection before discharge to receiving waters. As parts of the combined sewer system are separated, this same system can be used to treat stormwater runoff from the urban core portion of the CSO area.