Gig Harbor WWTP Outfall Extension

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Owner: City of Gig Harbor

Gig Harbor, WA
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July 2010 - March 2011
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Project Details

This project for the City of Gig Harbor replaced the undersized existing outfall pipe with high density polyethylene (HDPE) outfall pipe to increase the capacity of the Wastewater Treatment Plant and improve water quality in the Harbor.

AAC dug a sheetpile-lined trench to connect the new outfall pipe to the existing pump station at the end of the Harbor. The outfall then extended out to a Coast Guard owned sand spit where horizontal directional drilling was used to install this section of pipe. AAC’s subcontractor, Mears Drilling performed this work from a temporary work platform installed by AAC. Once the pipe was drilled under the spit, AAC deployed the final section of pipe into the Colvos Passage in Puget Sound.  AAC performed over 2,000 hours of dive time to install the new outfall pipe.

"This project was completed on-time and on-budget despite many challenging timelines required by permits from federal and state agencies. Such an achievement was the result of the combined assistance from all of the participants who, along with Advanced American Construction, represented a partnered consortium whose main goal was to complete this project within the time frames specified as well as ensure a high quality of workmanship."

"Once again, thank you for all your assistance along with all of the other individuals from Advanced American Construction who participated in making this a very successful project! We truly believe the dedication and professionalism shown by Advanced American Construction was a major reason for the success of this project."

Charles L. Hunter
Mayor, City of Gig Harbor
Stephen T. Misiurak, P.E.
City Engineer, City of Gig Harbor

Project Highlights

  • Replaced 1,600 foot long 10-inch existing outfall pipe with 9,228 feet of 24-inch HDPE outfall pipe
  • 5,808 feet of pipe extending from pump station to sand spit
  • 711 feet of pipe installed by horizontal directional drilling under the sand spit
  • Final 2,709 feet of pipe deployed into the Colvos Passage in Puget Sound at a 200 foot depth

Project Photos