Twin Pines Stormwater Detention Basin Project

2 Documents in Project


SCH Number
Lead Agency
City of Belmont
Document Title
Twin Pines Stormwater Detention Basin Project
Document Type
EIR - Draft EIR
Present Land Use
LU/Zoning: Public Space, Park/Plaza, and Public Facility, GPD: Open Space and Belmont Village Mixed Use
Document Description
The proposed Project involves the construction of an underground stormwater storage facility beneath the parking lots or other areas of the 10-acre Twin Pines Park. The project is designed to attenuate the peak stormwater flow of Belmont Creek, to trap sediment and debris, to reduce flood risk in the flood-prone lower creek reach, downstream of El Camino Real, and to provide ancillary water quality benefits. A diversion weir would divert high flows from Belmont Creek to the 9-acre-foot underground storage facility, where water would remain before flowing back into Belmont Creek through a 12-inch outlet pipe. The project would also include a sediment chamber, bank stabilization along Belmont Creek, and an in-stream check structure in Belmont Creek.

Contact Information

Elizabeth Wada
Agency Name
City of Belmont Public Works Department
Job Title
Associate Civil Engineer
Contact Types
Lead/Public Agency / Project Applicant


San Mateo
Northern California
Cross Streets
Twin Pines Lane east of Ralston Avenue, and south of 6th Avenue
Parcel #
045-170-080, 045-181-250, 045-181-230, and 045-181-280
State Highways
82 and 101
San Carlos Airport
Norte Dame de Namur University, Norte Dame High School
Belmont Creek
Mount Di

Notice of Completion

State Review Period Start
State Review Period End
State Reviewing Agencies
California Air Resources Board (ARB), California Department of Fish and Wildlife, Bay Delta Region 3 (CDFW), California Department of Fish and Wildlife, Marin Region 7 (CDFW), California Department of Forestry and Fire Protection (CAL FIRE), California Department of Parks and Recreation, California Department of Transportation, District 4 (DOT), California Department of Transportation, Division of Aeronautics (DOT), California Department of Transportation, Division of Transportation Planning (DOT), California Department of Water Resources (DWR), California Highway Patrol (CHP), California Native American Heritage Commission (NAHC), California Natural Resources Agency, California Public Utilities Commission (CPUC), California Regional Water Quality Control Board, San Francisco Bay Region 2 (RWQCB), California State Lands Commission (SLC), Department of Toxic Substances Control, Office of Historic Preservation, San Francisco Bay Conservation and Development Commission (BCDC), State Water Resources Control Board, Division of Drinking Water, State Water Resources Control Board, Division of Water Quality, State Water Resources Control Board, Division of Water Rights, State Water Resources Control Board, Divison of Financial Assistance
Development Types
Water Facilities (Stormwater storage facility )(Type Underground, MGD 0.23)
Local Actions
Flood Protection
Project Issues
Air Quality, Biological Resources, Flood Plain/Flooding, Hydrology/Water Quality, Tribal Cultural Resources, Archeological/Historical
Local Review Period Start
Local Review Period End


Notice of Completion [NOC] Transmittal form

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