Lower Alemany Area Stormwater Improvements Project

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