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Location: Portland, Oregon
Owner/Client: City of Portland Bureau of Environmental Services
00The City of Portland Bureau of Environmental
Services (BES) has selected Jacobs Associates to supplement its own construction
management team for the West Side Combined Sewer Overflows (CSO) projects.
West Side is one of the key components of the City of Portland’s
facilities to reduce the frequency and volume of combined sewerage overflows
into the Willamette River. Additionally, the CSO projects will help to
comply with an agreement the city has with the Oregon Department of Environmental
Quality. The work consists of a 19,000-foot-long tunnel in soft ground
with a minimum of 14 feet inside diameter, as well as a deep, large diameter
pump station, several deep drop shafts, 8,000 lf of 72 inch microtunnel
and 36 to 84 inch connecting pipelines. The alignment runs along, and
undercrosses the Willamette River through the City’s downtown. Ground
conditions throughout the alignment consist of soft and dense gravelly
sand, below the water table. The BES used a qualifications based process
to select the contractor team of Impregilo with S.A. Healy. A progressive
contract approach will be implemented whereby the contractor will be compensated
on a cost reimbursable fixed fee basis. Jacobs Associates leads the team
that also includes EPC Consultants, Columbia Geotechnical, Carollo Engineers
and consultants Dennis McCarry and Ed Heine.
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