Southeast Bay Outfall Settlement Monitoring & 54-inch Pipe Repair Project
Summary
SCH Number
2025080648
Public Agency
California Regional Water Quality Control Board, San Francisco Bay Region 2
(RWQCB)
Document Title
Southeast Bay Outfall Settlement Monitoring & 54-inch Pipe Repair Project
Document Type
NOE - Notice of Exemption
Received
Posted
8/15/2025
Document Description
The San Francisco Public Utilities Commission (SFPUC) will conduct maintenance activities at two separate areas along the Southeast Bay Outfall (SEO) pipeline at Pier 80 in the City and County of San Francisco. The maintenance activities include the installation of new settlement monitors below the top of bank immediately north of Islais Creek and the repair of existing pipeline beneath the pier in San Francisco Bay. New settlement monitors (up to five) will be installed along the 60-inch reinforced concrete cylinder pipe portion of the SEO pipeline. One settlement monitor will be installed just west of Illinois Street in Tulare Park near the shoreline, and four settlement monitors will be installed just east of Illinois Street near the shoreline. About five 2-foot diameter by 5-foot-deep excavations (2.5 cubic yards total) will be required to install the new settlement monitors, which will have a concrete cap and be flush with the ground surface upon completion of installation. Pipeline repair will be conducted on the 54-inch portion of the SEO near the end of Pier 80 along the underside of the pier. The repair includes an internal mechanical seal replacement at the joint, installation of a pipe strap, restraining rod repair, and installation of corrosion protection. The pipe strap, restraining rod, and corrosion protection components will be completed when the work area is exposed at low tide. The repair area will be accessed by a boat, which will be dispatched from either a dock near Islais Creek Booster Pump Station or from Pier 80 via a temporary support crane to launch and extract working boats. None of the pipeline repair work will require ground disturbance.
Contact Information
Name
Nathaniel Goetz
Agency Name
California Regional Water Quality Control Board, San Francisco Bay Region 2
Job Title
Water Resource Control Engineer
Contact Types
Lead/Public Agency
Phone
Location
Coordinates
Cities
San Francisco
Counties
San Francisco
Regions
San Francisco Bay Area
Notice of Exemption
Exempt Status
Categorical Exemption
Type, Section or Code
Class 1; Section 15301(d) - Existing Facilities; restoration or rehabilitation of deteriorated or damaged structures
Reasons for Exemption
This project involves the minor repair of an existing pipeline outfall with minimal permanent impacts to waters of the State (WOTS; <0.001 acres). The Permittee will implement avoidance and minimization measures, debris containment and sediment controls, and appropriate and effective best management practices (BMPs) during project work. BMPs include, but are not limited to: 1) pipe coating will be applied at low tide to allow full curing prior to contact with WOTS; 2) controls such as fiber rolls and/or silt fences to prevent discharges of sediment and other pollutants to WOTS; 3) a boat positioned under the pipe repair with a containment tarp or similar material to capture and safely dispose of any associated debris; 4) avoidance of epoxy material used to secure corrosion protection materials; 5) a spill response plan with absorbent materials readily available on-site to address unanticipated hazardous waste spills. Equipment and debris collected during the project work will be recycled or disposed of in accordance with the provisions of the San Francisco Construction and Demolition Debris Recovery Ordinance. None of the pipeline repair work will require ground disturbance.