Joint Water Pollution Control Plant Tunnel & Ocean Outfall
Location: Los Angeles, California
Owner: Sanitation Districts of Los Angeles County (Districts)
Market: Wastewater
Construction Cost: Over $1 Billion (Estimated)
Construction Start/End: 2012/2020 (Estimated)
Jacobs Associates’ Role: Feasibility and Preliminary Design as Subconsultant to Parsons
This project, if constructed, will comprise a new tunnel and outfall to convey treated wastewater out to sea for disposal. The Joint Water Pollution Control Plant (JWPCP) Tunnel and Ocean Outfall will provide relief to an existing outfall system serving a district of over five million people. These existing facilities – two tunnels built in 1937 and 1958, and four outfalls built from 1937 to 196 – currently operate near their peak capacity during extreme wet weather, and they have not had an inspection in some 50 years. Building a new tunnel and outfall promises to increase the reliability and flexibility of the Districts’ system, as well as to allow inspection, maintenance, and repair of the existing outfall facilities.
The proposed JWPCP onshore tunnel may reach a length of approximately 6 miles from the treatment plan to the coastline– somewhere under the Port of Los Angeles, San Pedro, or Palos Verdes Peninsula. The tunnel diameter will measure some 16 to 20 feet. From the coast the offshore tunnel may extend 10 miles. The offshore tunnel will ultimately connect to a diffuser for disposal. Design flows under review vary from 700 to 1200 million gallons per day.
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