Twin Pines Park Stormwater Detention Basin Project (Streambed Alteration Agreement No. EPIMS-SMO-57571-R3)
5 Documents in Project
Summary
SCH Number
2023100139
Lead Agency
City of Belmont
Document Title
Twin Pines Park Stormwater Detention Basin Project (Streambed Alteration Agreement No. EPIMS-SMO-57571-R3)
Document Type
NOD - Notice of Determination
Received
Posted
8/21/2026
Document Description
The California Department of Fish and Wildlife (CDFW) has executed Streambed Alteration Agreement (EPIMS-SMO-57571-R3), pursuant to Fish and Game Code section 1602, the project Applicant, City of Belmont Public Works.
The project will construct a 9-acre-foot below-ground stormwater storage facility under the Twin Pines Park parking lot upland of Belmont Creek. A 60-foot-wide high-flow diversion weir will be constructed along the creek bank parallel to the direction of flow, consisting of six 10-foot-wide tilting weir gates. Concrete wing walls approximately 36 feet long and 13.5 feet high, and 40 feet long and 12.5 feet high will be constructed on the upstream and downstream ends of the weir gates, respectively, to direct stream flows into the basin. The diversion weir height is designed to maintain up to 250 cubic feet per second (cfs) within Belmont Creek year-round. As flows exceed 250 cfs, water from the stream will enter the detention basin. Once flow conditions subside, the diverted water will be drained via gravity and pumping back into the creek through a 46-foot long, 18-inch diameter reinforced concrete pipe. The pipe outlet will be placed downstream of the detention basin weir and existing pedestrian bridge and will allow the detention basin to drain within 72 hours of filling. The downstream end of the outlet.
Contact Information
Name
Shannon Husband
Agency Name
Department of Fish and Wildlife
Job Title
Environmental Scientist
Contact Types
Responsible Agency
Phone
Name
Sean Rose
Agency Name
City of Belmont
Job Title
Lead Agency Contact
Contact Types
Lead/Public Agency
Phone
Location
Coordinates
Counties
San Mateo
Regions
San Francisco Bay Area
Parcel #
Assessor’s Parcel Number 045-170-080.
Other Location Info
The project is located at Belmont Creek, a tributary to the San Francisco Bay, in the County of San Mateo, State of California; Latitude 34.02884, Longitude -117.80324; 1 Twin Pines Lane, Belmont, CA 94002; Assessor’s Parcel Number 045-170-080.
Notice of Determination
Approving Agency
CA Department of Fish and Wildlife
Approving Agency Role
Responsible Agency
Approved On
County Clerk
San Mateo
Final Environmental Document Available at
The Final EIR prepared for the project is available to the general public at the office location listed above for the Lead Agency. CDFW’s record of project approval as a Responsible Agency is available at CDFW’s regional office.
Determinations
(1) The project will have a significant impact on the environment
Yes
(2a) An Environmental Impact Report was prepared for this project pursuant to the provisions of CEQA
Yes
(2b) A Mitigated or a Negative Declaration was prepared for this project pursuant to the provisions of CEQA
No
(2c) An other document type was prepared for this project pursuant to the provisions of CEQA
No
(3) Mitigated measures were made a condition of the approval of the project
Yes
(4) A mitigation reporting or monitoring plan was adopted for this project
Yes
(5) A Statement of Overriding Considerations was adopted for this project
Yes
(6) Findings were made pursuant to the provisions of CEQA
Yes
Attachments
Notice of Determination
Disclaimer: The Governor’s Office of Land Use and Climate Innovation (LCI) accepts no responsibility for the content or accessibility of these documents. To obtain an attachment in a different format, please contact the lead agency at the contact information listed above. For more information, please visit LCI’s Accessibility Site.