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PIPS Forcemain

Project Description

The City of Petaluma operates the Primary Influent Pump Station (PIPS) which collects wastewater from nearly the entirety of the City of Petaluma and delivers it to the Ellis Creek Water Recycling Facility (ECWRF) through a single 36-inch forcemain. The PIPS forcemain delivers up to 35 Million Gallons Per Day (MGD) of sewage to the City’s treatment plant via a single 36-inch-diameter, 2.5-mile-long Concrete Cylinder Pipe forcemain installed in 1973. For this project the City will plan, design, and ultimately construct a new 36-inch-diameter forcemain parallel to the existing forcemain, within the existing City easements.

The planning or first phase of the project will begin in November 2020. The City of Petaluma is contracting with the engineering firm Woodard & Curran, of Sacramento, California, along with their subcontractors to perform design and investigation. The planning phase of the project includes: a geotechnical investigation requiring drilling of boreholes; a complete topographic survey including aerial and ground surveying, complete environmental compliance adhering to CEQA guidelines, and obtaining all required permits for construction.

Project Location (approximate):

The proposed pipeline route is in the existing right-of-way, adjacent to the existing 36-inch-diameter forcemain. The pipeline route travels from the PIPS Facility, along improved roadways, through open space, beneath Highway 101 and the SMART Train Railway, crossing multiple creeks, adjacent to commercial buildings and parking areas, and ultimately terminates at the ECWRF.

Traffic Impact

During the drilling, site investigation, and surveying (planning phase of the project) traffic control measures will be in place to manage traffic flow in the area as well as protect the work areas. Parking along the streets may be impacted to ensure traffic flow through the area is maintained. Access to driveways and properties will be preserved at all times throughout the project. The City will make every effort possible to minimize traffic impacts to businesses/residents; however, please plan for some delays in the area and travel carefully through the work zone.

Timeline / Project Status

The overall project timeline is for the design and planning effort to last approximately 18 months, with construction beginning in FY 21/22.

November 2020 update – The approximate duration for the investigation and surveying phase of the project is two months. It is anticipated that the drilling and site investigation work will take place in early November 2020 and will be completed by December 2020. The survey work will likely start at the same time but continue throughout the end of the year into January 2021.

BID Details

This project has not bid yet.

Project Manager

Dan Herrera, P.E. - Senior Civil Engineer

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