Description
The Elliott West CSO Control Facility is one component of the $140 million Denny Way/Lake Union CSO project aiming to limit combined sewage overflows (CSO) that spill into Lake Washington and Elliott Bay during storms.
The Elliott West CSO Control Facility will have two main duties: treating combined sewage overflows during larger storms that occur about 20 times per year for release through the new Myrtle Edwards Park outfall; and pumping combined wastewater to the Elliott Bay Sewer Interceptor for conveyance to the West Point Treatment Plant for secondary treatment and discharge.
This contract includes a 250-million-gallon-per-day pump station that has a wet well, drywell, electrical room and mechanical room; a combined sewage overflow treatment area; chemical storage area and Denny Regulator addition.
The pump station has six large 400-horsepower motors operated with variable speed drivers to control pumping rates of six 29,000-gallon-per-minute pumps. The pumps will push up wastewater to a discharge channel for screening and disinfection.
The automated CSO treatment area uses screens to remove floatable material then chlorinates the wastewater with a sodium hypochlorite disinfection system.
Disinfecting will continue as the water leaves the control facilities and travels through the Elliott West effluent pipeline to an underground station for dechlorination at Myrtle Edwards Park prior to release.
Required items for the chemical storage area include: storage and feed equipment for sodium hypochlorite and sodium bisulfite; and an odor control area with four large activated carbon scrubbers, and ventilation fans to control odors from the wet well and CSO treatment structure.
RCI Construction previously won the contract to construct the Elliott West Pipelines, a phase of the Denny Way/Lake Union CSO project that bid in 2001.
Contractor:
RCI Construction,
1216 140th Ave. Court E.,
P.O. Box 1730, Sumner, WA 98390, (253) 863-5200
Architects:
Black and Veatch,
720 Third Ave., Suite 1100, Seattle, WA 98104,
(206) 682-1133
Streeter & Associates
Nakano Associates
(landscape)
Engineers:
Berona Engineers (HVAC)
HWA Geosciences
(geotechnical)
Shannon & Wilson
(geotechnical)
Symonds Consulting
Engineering, now part
of PACE (shoring and
architectural design)
Thomas/Wright
(civil/site engineering)
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Other Participants
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101 Vertical Fabrication
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Architectural Graphics Resources
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Architectural Specialties
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Atlas Construction Specialties Co.
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Black River Sheetmetal
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C.M. Hoskins Co.
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Cain Bott & Gasket
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Campbell-Cox Floor Covering
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Carney, Badley, Smith & Spellman
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CivilTech Corp.
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Crowe Building Specialties
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Crown Controls
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Cummins Northwest
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D & G Mechanical
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Denny’s Machine & Fab
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Dillon Mechanical
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Don Jordan Energy Systems
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Donald B. Murphy Contractors
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EFCO
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Elcon Corp.
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Fairweather Masonry
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Familian Northwest
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Farwest Steel Corp.
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Flowserve (c/o APSCO)
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FS Ltd./Fabrication Specialties
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GeoEngineers
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Glacier Northwest
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H.D. Fowler
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Hanson Pipe & Supply
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Harrington Industrial Plastics
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Heartwood
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Hermanson Co.
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Hilton Valve
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Hughes Supply
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Hurlen Construction Co.
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Hydro Gate Corp. (c/o Beaver Equipment)
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I Do That.net
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Infrastructures Inc.
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Queen City Sheetmetal & Roofing
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Qwest
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R&H Contractors
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R.H. Eastmond
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Rainier Steel
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Ralphs Concrete Pumping
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Rogers Machinery Co.
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Saunders & Associates
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Schindler Elevator Corp.
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Seasafe (c/o G.W. Haley & Assoc.)
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Seattle Fire Systems
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Seattle Sound and Vibration
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Shanahan’s Building Specialties
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Simonis & Associates
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Stacy Plumbing Supply
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Terra Dynamics
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The Bag Lady Inc.
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Tolco Inc.
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Triangle Pump & Equipment
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Utility Vault Co.
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Washington Precast Products
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Waste-Tech (c/o H.D. Fowler)
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White Shield
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Willis of Seattle
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