East Side CSO
- Location
- Portland, OR
- Owner
- City of Portland Bureau of Environmental Services
- Contractor
- Kiewit-led Joint Venture
- Value
- $382.5 million
- Completion
- December 2011
With rain occurring about 100 days a year in Portland, wastewater volumes often exceed the city's sewer system capacity, resulting in untreated overflows into the Willamette River. The East Side Combined Sewer Outflow (CSO) project is part of a massive tunnel construction program that will virtually eliminate combined sewer overflows into the river.
The Kiewit-led joint venture of Kiewit-Bilfinger-Berger (KBB) recently completed Phase 1 of the East Side CSO project, a $1.5 million Preconstruction Services contract. Phase 1 included design review and assist, a cost estimate and schedule, and development of project-specific programs such as safety, quality and subcontracting plans.
Based on KBB's exemplary performance during Phase 1, the team was awarded the $381 million Phase 2 contract, the single largest component of Portland's CSO program. Referred to as "the Big Pipe," Phase 2 is the largest public works contract ever awarded by the City of Portland.
Phase 2 consists of a network of shallow pipelines that will intercept the combined storm and sanitary wastewater, drop it down through shafts, and transport it to tunnels for storage until it can be treated. Work will include excavation and lining of a 22-ft.-dia. tunnel constructed 85 to 165 ft. below ground and seven separate shafts located along the alignment. Phase 2 began on March 21, 2006, with final completion scheduled for December 1, 2011.
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