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Location: Portland, Oregon
Owner/Client: City of Portland Bureau of Environmental Services
East Side CSO:
00The East Side Willamette CSO control system will intercept existing outfalls along the east side of the Willamette River. It will convey flow in a tunnel from SE 18th and SE McLoughlin through the east side industrial area to the existing Confluent Structure on Swan Island. The 30,000-foot tunnel system is expected to be approximately 22-feet finished inside diameter with depths ranging between 100 and 120 feet from the ground surface to the invert of the tunnel. The tunnel system will function as both a conveyance and a storage conduit for the Willamette River CSO control system. Along the tunnel route, a series of gravity conduits and drop structures will connect existing combined sewer outfalls to the tunnel. The construction contractor will be procured through a modified qualifications-based selection process at approximately sixty percent completion of final design of the facilities itemized above. This will result in a two-phase contract, a preconstruction consulting contract followed by a cost reimbursable plus a fixed fee construction contract. During the pre-construction phase of this contract, an Estimated Reimbursable Cost (ERC) will be negotiated with the contractor for the construction phase.
00JA Scope of Services: Supplementary construction management services to augment City staff, including providing the Construction Manager, Resident Engineer for Tunnels, Resident Engineer for Shafts, Cost Control Manager, and Scheduler.
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