Lower Alemany Area Stormwater Improvements Project
Summary
SCH Number
2025090493
Public Agency
City and County of San Francisco
Document Title
Lower Alemany Area Stormwater Improvements Project
Document Type
NOE - Notice of Exemption
Received
Posted
9/11/2025
Document Description
The San Francisco Public Utilities Commission is proposing to implement the Lower Alemany Area Stormwater Improvements Project (project) to manage stormwater and to meet the SFPUC's Sewer System Improvement Program level of service goals in the Lower Alemany neighborhood.
The project area sits in the Islais Creek watershed and historically floods during large storm events. During such events, flooding typically begins at the intersection of Alemany Boulevard and Ellsworth Street and continues beyond the U.S. 101 /Interstate 280 (I-280) interchange into Industrial Street and Bayshore Boulevard. The project is generally located along Alemany Boulevard and Gaven Street (south of I-280) and Boutwell Street and Industrial Street east of the U.S. 101 and I-280 interchange.
The project includes constructing a new, approximately 1.4-mile-long, Alemany auxiliary sewer. The Alemany auxiliary sewer alignment primarily occurs along Alemany Boulevard and Gaven Street (south of I-280), beneath U.S. 101, and along Boutwell Street and Industrial Street east of the I-280/U.S.-101 interchange. The Alemany auxiliary sewer would connect upstream to the existing Alemany sewer and downstream to the existing Barneveld Industrial Connection Structure, which includes the Industrial sewer and the Islais Creek transport/storage sewer. The Project primarily includes construction of the following components:
• Alemany Auxiliary Sewer – Tunnel and Shafts: approximately 6,350 linear feet of 10-foot-inside-diameter tunnel and three associated construction shafts and five permanent vent shafts.
• Alemany Auxiliary Sewer – Box Sewer: approximately 1,000 linear feet of box
• Upstream and downstream sewer connections
Contact Information
Name
Timothy Johnston
Agency Name
SF Planning Department
Job Title
Senior Planner
Contact Types
Lead/Public Agency
Phone
Name
Suzanne Huang
Agency Name
San Francisco Public Utilities Commission
Job Title
Project Applicant
Contact Types
Project Applicant
Phone
Email
Location
Cities
San Francisco
Counties
San Francisco
Regions
Citywide
Cross Streets
Alemany Boulevard and Gaven Street
Zip
94134
State Highways
101, 280
Notice of Exemption
Exempt Status
Categorical Exemption
Type, Section or Code
Class 1, Existing Facilities (Sec. 21084(a); 15301) and Class 3, (Section 15303
Reasons for Exemption
This project in its approved form has been determined to be exempt from environmental review because it fits the definition of the above-stated classes of categorical exemption and none of the exceptions to the issuance of a categorical exemption apply.
County Clerk
San Francisco
Attachments
Notice of Exemption
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