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New regional wastewater facilities to serve the growing population
As part of its mission to protect public health and the environment, King County is responsible for conveying and treating wastewater collected within the county's service area. King County is committed to upgrading and improving regional wastewater facilities to serve the growing population. The county provides capacity to support planned growth, consistent with theWashington State Growth Management Act (external link). Purpose of the projectWastewater from south King County is collected by local cities and sewer districts, including the cities of Kent, Auburn, Algona and Pacific. King County collects sewage from these local jurisdictions and conveys it to the county's South Treatment Plant in Renton. The population in the south portion of the service area is growing rapidly. Because of capacity limitations in its existing pipelines (called interceptors and trunks), King County needs to provide additional capacity in the near future. Constructed improvements will provide capacity to handle the 20-year peak flows through the year 2050. The new pipelines will provide service and operational flexibility to handle population growth in south King County. There are four individual projects in south King County that will be built in two phases: Phase A and Phase B. Recent engineering work has focused on pipe segments that need additional capacity and the phasing of those projects was created based on capacity needs. Phase A ProjectsPhase A projects consist of two new pipelines:
These pipelines are currently being designed. Construction will begin in late 2009, and the pipelines will be in service in 2011. Phase B ProjectsPhase B projects consist of two new pipelines:
Construction of these pipelines will begin in 2013 with the pipelines in service by 2015. >> back to top Project StatusKing County has selected preferred alignments for the new pipelines and is moving into final design for the Phase A projects (Stuck River Trunk and Kent East Hill Diversion). In final design, these alignments will be more thoroughly analyzed and developed. In addition, the county will focus on environmental review, applying for the appropriate permits and preparing construction bid documents. The Phase B projects (Pacific Pump Station Discharge and Auburn West Interceptor Parallel) are also moving forward in the design process. The project team will continue to work with project local jurisdictions, regulatory agencies, property owners and neighbors to gather feedback during design and in anticipation of construction. Anticipated project schedule for Phase A projects
Anticipated project schedule for Phase B projects
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Project areaThese projects involves pipeline improvements in two areas: the Auburn planning area, which includes the cities of Auburn, Algona and Pacific; and the Kent planning area. Click on the map (right) for an overview of the project areas, moving from north to south. Your comments and ideas are welcomeKing County is committed to being a good neighbor and welcomes your comments. Throughout the project, the county will work directly with the cities of Kent, Auburn, Algona, and Pacific and the public to ensure that suggestions and concerns are addressed. As the design is further developed, the county will work with local jurisdictions, key stakeholders, and the public to identify potential community and environmental impacts-and ways to minimize them. This work will continue during environmental review, permitting, construction, and long-term operations and maintenance of the facilities. For more information
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Department of Natural Resources and Parks Updated: Aug. 5, 2008
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Related Links Conveyance System Improvement Program Cities of Algona, Auburn, Kent and Pacific
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King County | Natural Resources & Parks | Wastewater Treatment Division
Links to external sites do not constitute endorsements by King
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