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SFPUC outlines Mountain Tunnel inspection, emergency restoration and long-term bypass planning
Summary
Staff reported erosion of Mountain Tunnel liner, proposed adding larger access adits and an emergency restoration plan to reduce recovery time to ~3 months, with inspection and staged repairs planned for 2017–2018 and conceptual bypass planning underway; estimated repair budget $20–25 million.
San Francisco Public Utilities Commission staff presented a multi-component approach April 28 to reduce the risk posed by erosion in the Mountain Tunnel — a critical upcountry conveyance that dates to 1925.
Kathy Howe described inspection findings and proposed actions: (1) enlarge selected adits (access openings) so heavy equipment can enter to remove debris; (2) implement an emergency restoration plan — prestocked materials and on-call contractors — aimed at returning the tunnel to service within about three months after a debris-induced loss of capacity (staff contrasted that with prior 6–9…
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