A New Pipeline Planned for PCH

Map of construction site

 Construction on a new PCH pipeline to keep polluted stormwater out of Santa Monica Bay will begin soon.

The City of Los Angeles will begin construction this month on the Coastal Interceptor Relief Sewer (CIRS), a new wastewater pipe along Pacific Coast Highway in the Pacific Palisades. Southbound traffic will be impacted intermittently from February 2011 through the end of 2012.  Work will begin at the south end of the project, by the Santa Monica-Los Angeles city border near the Annenberg Community Beach House, and continue north to just south of Temescal Canyon Road.  

The new 4,500-foot pipeline will run alongside the existing Coastal Interceptor Sewer and will provide increased flow capacity from eight newly-upgraded Santa Monica Bay low flow diversions, which currently divert polluted urban runoff during the summer months from sub-watersheds, to the Hyperion Wastewater Treatment Plant.  This infrastructure upgrade will keep urban runoff from flowing out into the ocean during dry weather all year long, helping keep Santa Monica Bay clean and assisting Los Angeles meet federal water quality regulations.  

Construction work hours will be 7:00 a.m. through 4:00 p.m. and 9:00 p.m. through 5:00 a.m., Mondays through Fridays and on some Saturdays.  At least two southbound traffic lanes will remain open daily and at least one lane at night.   Other construction impacts include dust, noise, loss of beach parking during non-summer months, and a detour for cyclists.  PCH users are encouraged to consider alternate routes.  Project updates are available on Twitter @PCHPartners. 

The $10 million CIRS and the low flow diversions are funded by the voter-approved Proposition O Clean Water Bond.  The $500-million bond is currently financing 32 stormwater improvement projects across Los Angeles to keep our creeks, rivers, lakes and beaches clean and keep LA in compliance with federal water quality mandates.

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Comments (6)

  1. Avatar for LA Stormwater
    Janis Hatlestad
    February 18th, 2011 at 8:39 pm

    Provisionally, I “like” this. However, more to the point… there would be a lot less dry weather run-off if more folks were to install climate-appropriate, water-wise landscape. Even a tune-up of irrigation systems would do much to reduce polluting run-off. It is time for Angelenos to own the impacts of water use outside their homes.

  2. Avatar for LA Stormwater
    Stormwater Control
    March 7th, 2011 at 11:27 am

    That is a good point – the city can only do so much in preventing stormwater runoff. If townspeople were to install better stormwater control measures, an even larger difference could be made. Thanks for posting the good news.
    -Jack

  3. Avatar for LA Stormwater
    gordon
    January 11th, 2014 at 11:46 am

    i don’t understand the problem here; is there really landscape runoff in dry weather that gets to the beach? i can see not watering when it rains.. that makes sense. i dont ever see water coming out of storm drains at the beach in dry weather. only during/after storms.

    • Avatar for LA Stormwater
      LA Stormwater
      January 13th, 2014 at 5:54 pm

      Hi Gordon,

      As hard as it may be to believe, there is landscape runoff in dry weather. It happens when people over-water their lawns and gardens, hose down their driveways and sidewalks or wash their cars. Even on the driest day in LA, 10 million gallons of polluted urban runoff flow from the streets into storm drains and out to the bays!

      The reason you don’t see water coming out of the storm drains is because the City of Los Angeles has installed low-flow diversions in many of the channels that flow into Santa Monica Bay. Essentially the diversions are pipes that route polluted urban runoff to Hyperion Wastewater Treatment Plant for treatment. It’s one solution the city is using to keep polluted runoff from reaching the beach during the popular summer months. Thanks for writing. That was a great question!

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