SEWPCP New Headworks Facility
Construction of Scope 1-200 & 1-300
50 Phelps Street, San Francisco, CA 94124
January 2019 - November 2019
San Francisco Public Utilities Commission
$3.8 Million
Shimmick Construction

Marinship Development Interest was selected as the excavation and shoring subcontractor for the San Francisco Public Utilities Commission (SFPUC) Southeast Water Pollution Control Plan (SEWPCP) New Headworks Facility Construction. The overall project, lead by Shimmick Construction, involved building a 100,000 million gallons per day (MGD) raw sewage bypass facility in the existing operating Waste Water Treatment Plant (WWTP). 

Our teams drilled 100 Cast-In-Drilled-Hole (CIDH) piers, installed an 84 inch diameter steel tee in an existing elevated pipeline, constructed a double box concrete culvert and junction structure

that were PVC Tee lock lined, and set a 66 inch diameter RCP Tee lock lined pipe. In addition, the existing utility trench that carried 16 different pipe services had to be temporarily

relocated, so as to not disrupt new construction. 

Throughout the duration of this project, the facility was kept fully operational; however, tie ins to the existing systems required full plant shutdowns. This entire complex is located underground and was built inside a 20-foot deep sheet pile excavation.

Marinship crews lent their expertise to accomplish the following project milestones:

  • Excavation, Haul-Off and Disposal Of Materials From PIJB Structure
  • Excavation, Haul-Off and Disposal Of Materials From Seismic Slab
  • Construction of An 84-in Pipe Support Foundations
  • Contaminated Soil Excavation and Haul-Off
  • Backfill and Compaction of Seismic Shelf

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