Project Overview
This project will make needed repairs to the wastewater lines that currently serve both the Edgemoor and Columbia neighborhoods, as well as a small section of 24th Street in the Happy Valley Neighborhood.
Edgemoor Neighborhood
Most of the wastewater lines run through the backyards of homes in the Edgemoor neighborhood, making access for maintenance and repairs difficult. Most of these wastewater lines were installed in the 1950s and are deteriorating and/or partially blocked. This project will improve the condition of the wastewater mains using trenchless repair methods to limit the impacts to properties. Delay of this project could cause major sewer failures and more impactful emergency work.
Columbia Neighborhood
Upgrades are also planned for wastewater lines in the Columbia neighborhood. Most of these lines are located within the City’s right-of-way, which makes traditional replacement options a viable, cost-effective solution. The majority of the Columbia wastewater lines were installed between the early 1900s and the 1960s, with some sections dating back to the early 1890s. These upgrades will address aging infrastructure and improve long-term reliability for the neighborhood.
Construction Impacts
Edgemoor Neighborhood
In the Edgemoor neighborhood, pipe improvements will be made using cured-in-place pipe (CIPP), which is a trenchless repair method. There are approximately 220 properties impacted by this project, and we anticipate needing construction access through approximately 65 properties. The City is making every effort to limit impacts on homeowners with these improvements. Small sections of pipe will be exposed for spot repairs, and some digging will be required for manhole installation in select locations. Any property disturbed during construction will be restored to its previous condition or better.
Columbia Neighborhood
In the Columbia neighborhood, wastewater pipes will be replaced or repaired using open-cut trenching methods, with some trenchless spot repairs. Open-cut trenching involves excavating the ground to access the pipe for repair or replacement. Trenchless repairs may be used where feasible to reduce surface disturbance.
Project Status – Fall 2026
Preliminary geotechnical assessments in the Columbia neighborhood are taking place in September, 2026. The assessments will help the City and its consultant determine existing soil conditions. The information gathered will be provided to contractors to use in anticipating trenching requirements and selecting appropriate trench shoring methods.
Staff are also establishing Temporary Construction Easements with homeowners in the Edgemoor neighborhood.
Construction – Summer 2027
We anticipate construction taking place in summer, 2027.
Project updates email
If you would like project updates, please sign up by providing your email address.
Contact
General project questions: askpw@cob.org
Media inquiries: pwmedia@cob.org
Project Engineer
Ian Hinton, P.E.
(360) 778-7700
idhinton@cob.org
