East Side Willamette River Combined Sewer Overflow
The East Side Combined Sewer Overflow (CSO) marks the largest sewer project yet undertaken by the City of Portland. The main element of this project, an approximately 22-foot-interior-diameter tunnel will run 6 miles in length along the east side of the Willamette River to the existing Swan Island Pump Station. A 300-foot-long tunnel boring machine has already begun tunnel excavation at depths ranging from 100 to 120 feet below-ground. Work also involves excavating seven large, deep shafts, measuring approximately 49 to 60 feet in diameter, and 110 to 165 feet deep.
Additionally, the East Side CSO includes building connecting pipelines and diversion structures to route overflow from 12 existing combined sewer outfalls to the new big tunnel. This involves conducting a 3,050-foot microtunnel drive, the longest ever attempted in the United States.
Jacobs Associates assists the owner with construction management services, including contract administration, resident engineering, and construction photography services. Additional services provided by Jacobs Associates include: claims and construction disputes consulting; cost estimating and cost control; construction scheduling and analysis; and design documents constructability review for tunnels and shafts. The Kiewit Bilfinger Berger Joint Venture serves as the contractor.
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