What’s Happening at Orange Memorial Park? Here is the Update

South San Francisco, CA  October 29, 2021

Many neighbors continue to question why there are large heaps of dirt covered on the field at Orange Memorial Park and we share information from both the County and the City on this project.

For those who missed our earlier coverage of this CLICK HERE

For those who missed our earlier coverage of the sports fields that will be coming CLICK HERE.

From the City of South San Francisco website:


In 2015, the San Francisco Regional Water Quality Control Board (RWQCB) issued the countywide Municipal Regional Stormwater Permit (MRP) to regulate stormwater discharges in San Mateo County. The MRP requires all permittees to implement green infrastructure improvements to reduce the amount of mercury and polychlorinated biphenyl (PCB) in stormwater discharges to the San Francisco Bay. The San Mateo County Stormwater Resource Plan (SRP) was developed to identify projects that could help meet the requirements of the MRP.  The SRP identified the proposed project as a high-priority regional project that can capture water from a large multi-jurisdictional drainage area.

Additional details on the SRP are located here.

Colma Creek Water Shed

Rain falling east of the Santa Cruz Mountain range drains into the San Francisco Bay, while rain falling on the western side drains to the Pacific Ocean.  This project helps clean water flowing from our cities to the Bay.  The reach of Colma Creek running through Orange Memorial Park drains over 6,500 acres of land from six different municipalities, including the City of South San Francisco.


This regional stormwater capture project, the first-of-its-kind in Northern California, diverts all dry-weather flow and the dirty first flush of urban stormwater runoff from Colma Creek into an underground system integrated within the park.

The project supports the City’s park Master Plan by co-locating stormwater capture, storage, and treatment facilities in Orange Memorial Park with the park renovations which will follow this project.

Orange Memorial Park Stormwater Capture Educational Placard


The project will capture runoff through the installation of an instream diversion and pre-treatment structure (trash screen and sediment removal chamber) at the upper end of the Colma Creek flood control channel within the park. Pretreated water will then enter a diversion pipe leading to an underground stormwater storage reservoir. A portion of the storage facility will function as a cistern, holding water for eventual non-potable irrigation use in the park and for water trucks, and the remainder will function as an infiltration chamber to recharge groundwater in the Westside Basin. Construction of these storage facilities will occur underneath a portion of the existing baseball and softball fields. A flow splitter is located just upstream of the storage facilities to discharge treated overflow back into the channel when storage capacity is exceeded.

Project Summary

Orange Memorial Park Stormwater Capture project will provide water quality improvements to meet the requirements of the San Francisco Bay MRP. The project is designed to reduce discharges of PCBs and mercury to San Francisco Bay and is the first regional stormwater project of its kind in the Bay Area.


The project is currently in the Construction phase and scheduled to begin construction early 2021.  For additional information, please contact our Construction Hotline at (650) 829-4600, or email us at Construction@ssf.net.

Quarterly Progress





For those who missed our earlier coverage of this CLICK HERE

For those who missed our earlier coverage of the sports fields that will be coming CLICK HERE.

A bit of that info is shared below:

Revitalizing the sports fields is Phase Two of the Orange Memorial Improvement Project, which will also include pavement restoration and other associated surface improvements. This multi-sport, all-weather field will include:
  • Electronic scoreboards
  • Synthetic turf
  • Sports field lighting
  • Enhanced planting areas
  • Spectator areas
  • One adult/teen baseball diamond with dugouts, bullpens, and batting cage
  • One adult/teen softball diamond with dugouts, bullpens, and batting cage
  • Two youth baseball diamonds with dugouts and bullpens
  • Two adult soccer fields with portable goals
  • Two junior soccer fields with portable goals
  • Four youth soccer fields with portable goals
  • Drinking fountains


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