Oak Basin Sewer Work Delayed to Spring 2009

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Environmental Services has designed a series of sewer improvements and stormwater management projects in an area of southeast and northeast Portland known as the Oak Basin (see project area map below). The work will alleviate basement flooding problems, and replace more than 8,000 feet of sewer pipes that are in poor condition. Some sewers in the area are more than 80 years old.  The upgrades will increase sewer system capacity, improve reliability and help control combined sewer overflows (CSOs) to the Willamette River. The work was originally scheduled to start in the summer of 2008, but has now been delayed to spring 2009.  The project will take about 18 months to complete.

The original project included replacing or refurbishing the existing sewer pipe in SE Oak between 18th and 10th.  This included work on Buckman School grounds and at St Francis Parish.  That work has now been pulled from this project and will be rescheduled later.  Included in the future project will be additional Green Street facilities in an area east of the School.

Sewer Construction Techniques

The Oak Basin Sewer Project will require both open-cut trench construction and trenchless techniques to rehabilitate existing sewers. The project also includes construction of a new large interceptor sewer line in SE 10th Avenue and an access shaft at 10th and SE Oak Street to connect the new line to the sewer system. Construction will affect traffic with both travel lane and street closures. The city will provide traffic control updates during all phases of construction.

Sustainable Stormwater Management– Green Street facilities

The Oak Basin Sewer Project includes construction of several Green Street facilities along SE Ankeny Street between SE 16th and 20th avenues. Green Streets are vegetated curb extensions or streetside planters that collect stormwater runoff from the street and keep it from flowing into the combined sewer system. Green Streets slow stormwater flow and allow water to soak into the ground as soil and vegetation filter pollutants. This sustainable stormwater management technique treats stormwater at the site, protects water quality and helps replenish groundwater supplies.

Coordination with Burnside – Couch Project

The City of Portland Office of Transportation (PDOT) is designing roadway improvements for the Lower East Burnside and Couch Reconfiguration Project. Environmental Services is coordinating with PDOT to complete sewer construction in the PDOT project area before road construction begins.
For More Information

Call David Allred at 503-823-7287 for additional information or to arrange a presentation for your organization or business. To receive email updates, send your email address to david.allred@bes.ci.portland.or.us. Learn more about the Environmental Services Sustainable Stormwater Program at www.portlandonline.com/sustainablestormwater.

David will also be giving a presentation and be available to answer your questions at the November 13th general meeting at Buckman School.

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