Bangor-Keyport Force Main Replacement

In Kitsap County, there was a pressing need to upgrade the sewage infrastructure, specifically the forcemain running from the USN Bangor base to the Central Kitsap Treatment Plant (CKTP) in Brownsville. This critical project aimed to address the corrosion issues and pipe failures that had been plaguing the existing 40-year-old ductile iron pipe.

The project focused on a six-mile section between Bangor and the CKTP, which involved four pump stations, individual pump stations, and numerous air/vac stations. Sewage flows were collected at Bangor Naval Base, then pumped approximately four miles to Pump Station #24. Additional flow from the City of Poulsbo, Bangor, and the Keyport residential area was integrated, and the combined flow was pumped another mile and a half to the CKTP.

To effectively abandon the existing lines in place, a Controlled Low Strength Material (CLSM) was required. In this case, cellular concrete was chosen as an alternative to traditional sanded CLSM. Its remarkable flowability and ability to reduce the number of access pits needed for material injection made it an ideal choice for the project. Approximately 26,500 lineal feet of line were successfully abandoned using 2400CY of class II material.

One of the notable achievements of this project was the successful completion without major disruption to traffic in the area. The dedicated team involved in this endeavor ensured that the necessary upgrades were carried out efficiently and effectively, minimizing inconveniences for the local community.