- Emergency Woods Street Trunk Sewer Relocation;
- Woods Street Trunk Sewer Abandonment; and
- Emergency Woods Street Trunk Sewer Rehabilitation.
This group of three emergency contracts negotiated with the City of Portland were to replace severely deteriorated gravity sewer lines that serve the Ross Island Bridge and Naito Parkway interchange and the Lair Hill residential neighborhood of Portland. Utilizing a combination of open-cut, microtunneling and trenchless methods, JWF was able to successfully replace over 4,000 feet of sewer pipeline in an extremely busy section of metropolitan Portland. In addition to the challenges associated with the location, the project also required close coordination with local businesses and residents to minimize impacts and we were able to successfully complete all work with minimum disruption.
The open-cut work included construction of 400 lineal feet of 36-inch combined sewer reinforced concrete pipe (RCP), 275 lineal feet of 24-inch diameter cured in place pipe, approximately 1,000 lineal feet of 36-inch RCP at a depth of 15 to 25 feet, and 1,000 lineal feet of 6- to 16-inch sewer services.
Approximately 904 lineal feet of 36-inch reinforced concrete pipe was installed by microtunneling in one drive with two interjacks. The 55-inch diameter microtunnel crossed beneath fifteen traffic lanes serving the greater downtown area, including Interstates 5 and 405, at a depth of up to 45 feet.
The remaining portion of the project involved two guided auger bores of 54-inch steel casing. The first bore was 140 feet which we self performed under a heavily traveled US Highway 26. A second 300-foot guided auger bore was offered to a minority subcontractor to support the City’s diversity program.