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North Point Outfall Rehabilitation

Marine Construction Project in Piers 33 and 35, The Embarcadero, San Francisco, CA

Project Details

Client: San Francisco Public Utilities Commission (SFPUC)
Location: Piers 33 and 35, The Embarcadero, San Francisco, CA
Construction: November 2017 - November 2017

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Project Description

The North Point Outfall Rehabilitation Project involves the cleaning and relining of the interior of over 3000 lineal feet of Cast Iron Pipe in the San Francisco Bay, and over 1300 lineal feet of Reinforced Concrete Pipe under The Embarcadero.  Additionally, the project involves constructing upgraded ventilation for the outfall system. Lastly, the project requires that over 6000 cubic yards of sediment be dredged from under Piers 33 and 35 so that the outfall system could operate efficiently.

Major Challenges
The outfall system is entirely underwater and the scope of work required that pipe interior be completely dry so that they could be re-line with an epoxy coating.  In order to accomplish this, The Dutra Group and its subcontractors installed four 48 inch steel pipe plugs to prevent Bay water from entering the pipe while crews were inside.  Additionally, the North Point Facility is required to discharge water whenever there is rain in San Francisco. Therefore, the allowable work window was very short and the work had to be completed in 5 months.