MAILING ADDRESS: 1120 SW 5th Ave, Room 1000, Portland, OR 97204
Environmental Services has almost completed design of a project to repair about 3,700 feet of the 110-year-old brick Taggart Outfall sewer. Structural failure of the Outfall would have profound impacts on Southeast Portland, potentially flooding numerous businesses and residences and resulting in many millions of dollars of property damage and disruption. This project will allow the Outfall sewer to properly perform its role in protecting public health, water quality, and the environment for another 100 years.
Contractor selection will occur in the spring of 2018 and will be followed by pre-construction video inspection of the Outfall in the summer. This information will enable the contractor to order the liner plate to repair the Taggart Outfall sewer pipes.
Sewer repairs are anticipated to occur during the dry seasons between May and October of 2019 and 2020. Construction activities will be concentrated at existing manhole access locations along the Taggart Outfall. Work zones will move as project segments are completed.
The Portland Noise Office approved the city's request for a Noise Variance. To take advantage of Portland's dry season to complete these urgent repairs, Environmental Services is planning 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 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.
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:
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