September 6, 2024

Kiewit tapped for county's $226M Elliott treatment station upgrade

Photo from project website [enlarge]

Since 2005, the station along Elliott Avenue West has disinfected wet weather flows when they exceed the storage capacity of the Mercer and Denny combined sewer overflow tunnels.

King County's Wastewater Treatment Division picked Kiewit Infrastructure West Tuesday as general contractor/construction manager to start pre-construction on its two-phase $226 million upgrade and expansion of its Elliott West Wet Weather Treatment Station.

Kiewit was awarded $5.5 million for the project's pre-construction phase, which will begin in the middle of this month, according to Melissa Jordan, a division contract specialist for King County. The construction phase of the project is estimated to cost around $221 million, according to the project's request for proposals, and will begin after pre-construction work and contract negotiations are complete. A notification for the award ran in Tuesday's DJC. Work is scheduled to be complete at the end of 2032, according to the RFP.

As reported by the DJC in February, the project will significantly expand and improve the station at 545 Elliott Ave. W., bordering Seattle's Uptown neighborhood. The station has been operating since 2005. It disinfects wet weather flows when they exceed the storage capacity of the city's Mercer and Denny combined sewer overflow tunnels. Also on the project team are Jacobs Engineering Group and Parametrix.

The project includes replacing and upgrading the screening facility, completing pump modifications, adding ballasted sedimentation technology for solids removal, replacing the existing on-site chlorine disinfection system with a UV one, making electrical upgrades, and completing modifications to the operation of the Mercer Street Tunnel for additional equalization.

The DJC wrote last August that the county needs the upgrade to ensure compliance with stricter environmental regulations, to meet the demands of a growing population and to handle a changing climate.

The project is funded in part through State Revolving Funds and Water and Infrastructure Financing Innovation Act loans. Flatiron West and Hoffman Construction were also on the shortlist for the project.

Among Kiewit's other recent large project awards, the Washington State Department of Transportation picked Kiewit in June to replace five fish barriers in the Bremerton and Port Orchard area (that project is estimated at $110 million to $130 million), and in February to replace fish barrier culvert crossings in Skagit and Whatcom counties, estimated at $136 million.

Related Stories:

• $225M contract out for county's Elliott treatment station upgrade  02-14-2024