Design and Construction of Pipelines for the Dominguez Gap Seawater Barrier Project

The Dominguez Gap Seawater Barrier Project is part of a Los Angeles County Department of Public Works project designed to limit the intrusion of seawater into the West Coast groundwater basin. The project involved the design and construction of approximately 2,130 m (7,000 ft) of parallel pipelines including steel water pipelines, stainless steel compressed air pipelines, electrical and telemetry conduits, and a PVC gravity drain pipeline. The pipelines connect to groundwater injection wells and provide water for injection, air for juttering and lifting of wastewater during periodic well redevelopment, and a gravity drain line for removing the wastewater from well redevelopment. Approximately 885 m (2,900 ft) of the pipelines were installed as a bundle inside a 1370 mm (54 in.) casing. The casing was installed using microtunneling and pipe jacking methods to avoid impacts to traffic along busy streets and an existing container facility. Approximately 460 m (1,500 ft) of the drain line were installed separately using pilot tube microtunneling methods in drive lengths over 80 m (270 ft). At each injection well, the pipelines were routed up the walls of an access manhole and connected to the well vaults that were constructed under a previous contract. Key design and construction challenges included installation of the pipeline bundle inside the casing; maintaining grade of the drain pipeline within the casing; corrosion protection of the steel pipelines, and vertical and lateral support of pipeline in the manholes.


  • English

Media Info

  • Media Type: CD-ROM
  • Features: Figures; Photos;
  • Pagination: 11p
  • Monograph Title: Pipeline Engineering and Construction: What's on the Horizon? Proceedings of the Pipelines 2004 International Conference, August 1-4, 2004, San Diego, California

Subject/Index Terms

Filing Info

  • Accession Number: 01003241
  • Record Type: Publication
  • ISBN: 0784407452
  • Files: TRIS
  • Created Date: Aug 15 2005 8:47AM