1120 SW 5th Avenue, Room 1000, Portland, OR 97204
Sewer repairs are anticipated to occur between May and October of 2018 and 2019. Construction activities will be concentrated at existing manhole access locations along the Taggart Outfall. Work zones will move as project segments are completed.
The Outfall will be repaired using construction methods that can be completed from inside the sewer line and will require minimal work aboveground in the roadway.
Crews can safely work in the Outfall pipes only on dry days when there will be no flow in the pipes from rain or other parts of the sewer system. Work at each manhole west of the light rail tracks may last several months, while work on manholes in SE 16th Avenue and in SE Tibbetts Street should be less than a month at each location. Crews may be working at multiple locations at the same time.
To take advantage of Portland's dry season to complete these urgent repairs, Environmental Services is proposing to work all hours and all days in the industrial area between SE Grand Avenue and SE 16th Avenue adjacent to light rail. Work in the other, more residential areas will be completed during regular daytime construction hours from 7 a.m. to 6 p.m. Monday through Friday, and Saturday if needed.
The primary construction method to repair the Taggart Outfall will be Tunnel Liner Plate. Of all the construction methods Environmental Services analyzed, this method will most effectively reinforce the Outfall pipe and cause the least impact and disruption to the neighborhood. This method will minimize traffic impacts and noise. All access to the sewer will be through existing manholes with no excavation required.
The vast majority of construction time will be the installation of the tunnel liner plate. The liner plate will be delivered to the access points on flatbed trucks and off loaded using fork lifts. The liner plate will then be lowered into manholes and assembled underground in the sewer. In some areas, vactor trucks may be used to remove sediment from sewer prior to installation of the liner plate; however, there is a very limited amount of sediment in the sewer. This activity will be limited in duration.
Once the liner plate is installed in each section, the space between the brick sewer and the liner plate will be grouted; this operation will be of short duration and take significantly less time than the installation of the liner plate. Grout pumps located on the surface near the access manholes will pump the grout into the sewer.
Once sections of grouted liner plate are completed, cementitious material will be installed on the inside face of the liner plate in the industrial area only. Cement pumps will be located on the surface by the access manholes. This is a short duration activity. Generators on the surface, near the access manholes, will be required for the pumps and other equipment used in construction. All generators and compressors will be silenced.
The major sources of noise will be the grout pumps, generators, and unloading of the liner plates. The contractor will be required, by contract, to use quiet generators. The other major source of noise will be the delivery and unloading of the liner plate. Mitigation measures are incorporated into the construction contract. These mitigation measures are the following:
Portland noise code allows construction from 7 a.m. to 6 p.m. Monday through Saturday. Work after 6 p.m. and before 7 a.m. and all hours on Sundays requires a Noise Variance from the Portland Noise Office. Because construction crews will work days, nights, and weekends in the industrial area between SE Grand Avenue and SE 16th Avenue adjacent to light rail, Environmental Services will apply for a Noise Variance.
Equipment that generates noise may include flatbed trucks, generators, concrete trucks, and grout pumps. Noise will most commonly result from unloading steel plates from trucks, running generators required for ventilation and other equipment, and running grout pumps. Night work will also require lighting of the area.
Your comments regarding the proposed 24/7 schedule are valuable and you can submit them to the Portland Noise office by letter or email. Please submit your comments by June 19 to:
Portland Noise Office
1221 SW 4th Avenue, Suite 110
Portland, OR 97204
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