Kent-Auburn conveyance system improvement

Auburn planning area (including cities of Algona and Pacific)

The Auburn planning area portion of the project involves wastewater pipeline improvements in the cities of Auburn, Algona and Pacific. This planning area is densely populated with intermittent areas of rural land. Railroad tracks owned by Burlington Northern Santa Fe (BNSF) and Union Pacific are located within the area, as are State Route 167 and State Route 18.

The county operates multiple wastewater pipelines that serve this planning area. A number of the existing pipelines are approaching capacity limits and improvements are required to provide additional capacity. Some of the solutions under consideration would reroute wastewater from pipelines that are at or near capacity to other existing pipelines with available capacity. Another solution is to increase capacity of the existing pipelines by either replacing existing pipelines with larger pipelines or providing new parallel pipelines.

An overview of the three proposed pipelines in the Auburn planning area is provided below. The Stuck River Trunk project is scheduled to begin construction in 2010 with completion in 2011 (Phase A). The Pacific Pump Station Discharge and Auburn West Interceptor Parallel are included in a later phase (Phase B) and are scheduled to be completed in 2015. The county is currently working with property owners and local jurisdictions to determine the final locations of the Phase B projects.

1. Stuck River Trunk (Phase A project)  View larger version (PDF 517KB)   View larger version (PDF 207KB)

   Stuck River Trunk (Phase A)
   This pipeline improvement will address capacity limitations in the existing M Street Trunk in east Auburn, which is projected to reach capacity by 2010. A new sewer, called the Stuck River Trunk, will take flow from the south end of the existing M Street Trunk and route it west to the Lakeland Hills Trunk. The current preferred alignment runs from K Street SE, west along 17th Street SE, beneath the BNSF Railroad tracks to C Street SW, where it then connects to the county's existing Lakeland Hills Trunk.
2. Pacific Pump Station Discharge (Phase B)
   This new pipeline will carry wastewater north from the city of Pacific to the city of Auburn . The sewer will run from the county's Pacific Pump Station along Frontage Road and Seattle Boulevard to 1 st Avenue South . The pipe will continue north along the eastern edge of the Puget Sound Energy (PSE) corridor, cross under the Union Pacific Railroad tracks to Perimeter Road in Auburn , and will continue north to the intersection of Perimeter Road and 15 th Street SW where it will connect to the new Auburn West Interceptor Parallel.
3. Auburn West Interceptor Parallel (Phase B)
   The county needs to increase the capacity of the southern portion of the existing Auburn West Interceptor between 15th Street SW and W Main Street in the city of Auburn. A new sewer, called the Auburn West Interceptor Parallel, will run parallel to the existing county Auburn West Interceptor Sewer. This pipe will run north from the intersection of Perimeter Road and 15th Street SW, cross under State Route 18, and connect to the existing Auburn West Interceptor at W Main Street and Clay Street in Auburn.