Art Anderson Associates provided civil and structural engineering services to develop a marine outfall for King County's new Brightwater wastewater treatment system.  Our scope included the preparation of plans, specifications, a basis of design report and calculations for plastic pipe weights and a reinforced concrete pipe anchor in support of our design/build partner Triton Marine Construction.  We also designed the temporary construction trestle.  The purpose of the anchor is to resist axial loads on the twin 63-inch HDPE pipe system caused by seismic or landslide events.  Both of the mile-long pipes and the anchor system are now resting 600 feet below the surface of Puget Sound.

In response to increased growth in the region, King County is constructing a new $1.6-billion regional wastewater treatment plant, called Brightwater.  Construction started in 2005 and is scheduled to be completed in 2010, with operations starting in 2011.  Brightwater will serve portions of King and Snohomish counties and support the County's mission to protect public health and the environment.  The new facilities will include a treatment plant, conveyance (pipes and pumps taking wastewater to and from the plant), and a marine outfall and will feature the largest membrane bioreactor system in the United States.

The Brightwater Outfall project was featured in the September 28, 2008 issue of Engineering News Record.  Read the article.

Engineering News Record also recognized the Brightwater Outfall project with the "Best of the Best" award in the heavy/civil construction category.  Read the King County Press Release.

Engineering News Record also awarded the project its "Best of 2009" Award in the heavy/civil category.  Read the feature story on the ENR website.