Study for Sewer Force Main at Montara Says Pipe Failed Due to Longterm Extreme External Corrosion Caused by Geologically Wet Soil

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VIDEO. From the Sewer Authority Mid-Coastside (SAM) meeting on Monday, August 28th, 2023 at 7:00pm, as a hybrid meeting.

 

Full Agenda

Report on Evaluation of the Montara Force Main Failure during Winter Storms of December 2022 and January 2023.

On March 27, 2023, SAM staff informed the Board that an Engineering firm Exponent Inc. was being hired to investigate and analyze the recent pipe failure of the Montara Force Main during the winter storms of December 2022 and January 2023.

Exponent Inc. performed site visits on March 27-29, 2023, had discussions with Staff and reviewed all records available. Subsequently Exponent Inc. examined pipe sections at their laboratory in Menlo Park.

The detailed examination indicated that the primary mode of failure was due to severe external corrosion on the pipe bottom. Also, the possibility of a significant amount of grit/debris could have collected and moved along the bottom of the pipeline causing erosion of the pipeline inner liner.

 


 

 

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Sewer Authority Mid-Coastside (SAM) Meetings ~ 2nd & 4th Mondays @ 7:00pm

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SAM Agendas and Zoom Links

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Regular Board Meetings are on the 2nd and 4th Mondays of each month at 7:00pm.

 

Contact Us

Our regular office hours are 7:00 a.m. through 4:00 p.m., Monday through Friday, excluding holidays. The Authority can be reached 24-hours a day at:

(650) 726-0124

 

Our Mailing Address is:

Sewer Authority Mid-Coastside
1000 Cabrillo Hwy N.
Half Moon Bay,  CA  94019

(650) 726-7833 (fax)

 

Regular Board Meetings are on the 2nd and 4th Mondays of each month at 7:00pm.

From time to time a meeting date may be changed, cancelled or relocated. Check the posted agenda for any changes to the normal schedule (click on links below).

The Sewer Authority Mid-Coastside (SAM) provides wastewater treatment services and contract collection maintenance services for a population of approximately 27,000 in the following areas:

  • City of Half Moon Bay
  • El Granada
  • Miramar
  • Montara
  • Moss Beach
  • Princeton by the Sea

 


 

SAM Directors

SAM is a joint powers authority (JPA) created by its three member agencies: City of Half Moon Bay (City), Granada Community Services District (GCSD), and the Montara Water and Sanitary District (MWSD).

 

The JPA is a separate, independent, public agency created by the member agencies to perform functions and share powers common to the member agencies. Those powers are outlined in a joint exercise of powers agreement (Agreement). The Agreement creating SAM can be found on the Documents page.

 

Each Agreement identifies how the independent agency will be governed. In the case of SAM, each member agency appoints two members from its governing board to represent it on the SAM Board of Directors, for a total of six directors.

 

The Agreement also establishes the weight of each director’s vote. The vote by each representatives from the City is given the weight of two votes. The vote by each representative from GCSD and MWSD is given the weight of one vote. The total number of possible votes is eight. A quorum is a minimum of five votes and resolutions require at least six votes to pass.

 

Barbara Dye

Vice-ChairRepresenting the Granada Community Services District

Deborah Ruddock

Secretary/TreasurerRepresenting the City of Half Moon Bay

Peter Dekker

Director, Representing the Montara Water & Sanitary District

Matthew Clark

DirectorRepresenting the Granada Community Services District

Coastside Buzz
Author: Coastside Buzz

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