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Utilities describe permanent plan options after emergency repair of exposed gas main in Arastradero Preserve
Summary
City utilities staff described emergency protection work placed around an exposed natural gas pipeline in Arastradero Creek, said consultants are developing alternatives and predicted design, permitting and in‑stream work between 2025–2027. The city filed required permits and plans multi‑year monitoring.
City utilities staff briefed the Parks and Recreation Commission on March 25 about an exposed natural gas pipeline in Arastradero Creek and the path toward a permanent repair and creek restoration.
Erin Perkins, principal engineer for Utilities, said a hiker notified the city of an exposed high‑pressure natural gas pipeline in March 2023. The exposed segment sat adjacent to potable water and sanitary sewer mains that serve Foothill residents. To protect the lines before the wet season, utilities crews placed temporary cobble and riprap under a U.S. Army Corps of Engineers Regional General Permit 5 (RGP 5) for emergency repair; staff also added bank stabilization, wattles and native reseeding.
Why this matters: the exposed gas main is a safety and service‑continuity issue for the foothill neighborhood and reservoirs above the city. The utility lines are critical for water and gas service; any long‑term solution must protect infrastructure while meeting state and federal environmental permitting requirements.
Permanent design, permits and schedule Perkins said the city procured WRA to produce a permanent alternatives evaluation (notice to proceed issued in December 2024). The consultant is collecting flow, geomorphic, geotechnical and biological data; staff expects an alternatives memorandum in May 2025 that will analyze whether utilities can relocate pipelines outside the creek or must perform a more extensive creek restoration. Utilities told the commission it filed a Notice of Completion and other permit documentation with the Water Board; Army Corps, Fish and Wildlife and Water Board approvals and post‑construction monitoring are expected elements of final permits.
Construction and monitoring expectations Perkins outlined a draft schedule: construction bidding in mid‑ to late‑2026, with in‑stream work anticipated in a December–January in‑water window to meet permit restrictions (the presentation identified a likely in‑stream construction window of Dec. 2026–Jan. 2027). Post‑construction monitoring, including geomorphic and biological compliance reporting, would continue for multiple years and require annual reporting to permitting agencies. Utilities said the temporary repair has held through recent storms and is monitored regularly. Staff also told the commission that the gas line is inspected quarterly.
Public comment and next steps No members of the public spoke on the item. Perkins said staff would continue data collection, produce the alternatives evaluation and return to the commission with design and permitting details; construction will require additional environmental review and likely council approvals due to project cost and preserve impacts.
