East Side Treatment Plant Outfall Replacement

Project Status (Updated August 10, 2018)


American Construction Co. is currently preparing for this project by submitting all required construction documentation and permits; and by purchasing necessary materials. The contractor is expected to mobilize the beginning of September 2018. When everything is in place, American Construction Co. will complete the first part of the project, mobilization of floating barges and installation of shoring, followed by trench excavation. This is anticipated to be complete by the third week of October at which time a portion of the existing pipe will be removed. Please check back for updates.

Project Overview


The ESTP provides treatment of combined sewerage in East Bremerton during heavy rainfall events. The outfall for the plant discharges to the Port Washington Narrows immediately east of Lions Park. The existing outfall is approximately 450 feet in length and consists of 20” cast iron pipe and a 36” concrete diffuser pipe. The pipe is undersized and partially filled with gravel. A video inspection performed in 2017 indicated that sediment and rock have significantly filled the diffuser section, which reduces the hydraulic capacity of the outfall. Because of the reduced capacity, flow backs up in the outfall pipe during extreme weather events, which limits the discharge capacity of the ESTP.  

The work includes approximately 500 feet of in-water work, including 250 feet of reinforced concrete pipe installation, removal of the existing multi-port diffuser, and installation of a new single-port diffuser. Replacing only the necessary sections of the outfall saves the City a substantial amount of money compared to constructing an entirely new outfall.

Murraysmith, Inc. was selected by the City in October 2016 to design a new outfall for the facility. The new outfall will ensure proper discharge of treated combined sewer overflow events from the ESTP to the Puget Sound during heavy weather.  

Budget

The overall budget for this project is $1,775,000 including design, construction, etc.

Schedule


The Bid Opening will be held on May 9, 2018. Construction is scheduled to from August 2018 to February 2019. (This section will be updated after Preconstruction Conference when more info is available.)
ESTP Outfall Alignment
ESTP Outfall Beach
ESTP Outfall Under Water