PACE provided a comprehensive solution to address the challenges posed by aging water mains along South 128th Street from Occidental Avenue South to 24th Avenue South and to assist the district in securing a low-interest loan from the Public Works Trust Fund (PWTF). Our plan involves:

  • Installing 7,500 LF of 12-inch ductile iron pipes.
  • Installing 1,100 LF of eight-inch water main.
  • Connection to existing distribution mains at 32 locations.
  • Replacing dead-end mains.
  • Installing fire hydrants and domestic services.

Project challenges included navigating intersections, avoiding utility conflicts, and addressing existing water service meter locations. The project is located within the Cities of Burien and SeaTac and includes work within WSDOT’s SR 509 right-of-way. We proposed phasing the project based on location to account for funding availability and construction estimates to ensure successful implementation. PACE delivered the project in June 2023, two months before the PWTF application deadline.

To facilitate the engineering process, PACE’s surveyors completed all fieldwork to produce basemaps and right-of-way plans. Tasks included:

  • Locating existing underground utilities.
  • Obtaining as-built maps from utility providers.
  • Researching public records.
  • Establishing survey control points.




Client Name

King County Water District #20


SeaTac, WA


  • Water Main Design
  • Topographic Mapping