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Hidden Lake Pump Station Replacement and Sewer Improvement Project

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Hidden Lake Pump Station Replacement

What's New

The new pump station was designed to blend in with the residential neighborhood
The new pump station was designed to blend in with the residential neighborhood.
More construction photos.

 

Construction Update -
March 2008

Work on the new Hidden Lake Pump Station began in July 2006. The outside structure was built first, followed by work inside to install piping and to prepare for equipment installation. Power was provided to the building in early 2008. The first phase of connections from the existing sewer line to the new pump station was completed on March 26, 2008. The pumps that will move wastewater will arrive in June of 2008. The pump station is currently expected to begin operations in late 2008.

The existing pump station, which has remained in service during construction, will be demolished after the new pump station is completed and undergoes final testing. During testing, both pump stations will be operational.

After constructing the outside of the pump station, crews began installing equipment and controls to run the new facility.
After constructing the outside of the pump station, crews began installing equipment and controls to run the new facility.

 

Why do we need the Hidden Lake project?
Why do we need the Hidden Lake project? For more information, view Spring 2006 Newsletter (PDF, 900 KB)

See project library for pump station fact sheet.

Site and Station Designs

Pump Station Site Plan
Site Plan

mitigation site plan
Landscape Plan

south and east views of new station
Station Elevation View

Sewer Connections at the new Pump Station
Sewer Connections at the new
Pump Station

King County's Hidden Lake Pump Station serves part of Shoreline and collects wastewater from the Ronald Wastewater District and Highlands Sewer District. Wastewater is conveyed from Hidden Lake to the Richmond Beach Pump Station, and onward to Edmonds Treatment Plant. The old pump station was constructed nearly 40 years ago and needed to be replaced in order to:

  • Ensure safe and reliable operations for the future
  • Address critical capacity needs by increasing pumping capacity from 4.3 million gallons per day (mgd) to 6.8 mgd
  • Protect Puget Sound by reducing overflows
  • Meet current design standards, including odor and noise control

The new pump station is being built on the existing site. The building and landscape design was refined with citizen input and will blend in with the surrounding residential neighborhood. Restoration with native plants will create drought-tolerant, low maintenance landscaping that will screen neighboring properties.

Key considerations during design

King County held several public meetings in 2003 and consulted with neighbors. This table summarizes what we've heard and how we've addressed various issues during the design process.

Community issue Pump station design features
Views from neighboring properties
  • Rooflines and building materials that fit in residential setting (increased pitch)
  • Vegetative screening and sidewalks

Building materials

  • Earth tones for building exterior. Variety of materials to add interest
  • Tile roof

Landscaping

  • Site restoration
  • Native, drought-tolerant, low maintenance plantings

Height of building

  • Aboveground for efficient operations and maintenance (cannot be underground)
  • Access road/landscaping in front to reduce building mass

Fencing

  • Security fence behind building to discourage partying below

Noise and odor control

  • Odor control unit
  • Sound control/equipment enclosures

Long-term operation

  • Reliable, durable, energy-efficient equipment

Tentative schedule

Refer to schedule on project home page.

For more information


Home | Boeing Creek Trunk Sewer | Underground Storage Pipe | Pump Station

Department of Natural Resources and Parks
Wastewater Treatment Division
201 S. Jackson St.
Seattle, WA 98104-3855
Fax: 206-684-1278

Updated: April 21, 2008


 

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