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PUC staff recommends rehabilitation and downstream control for Mountain Tunnel; schedule, cost estimates presented
Summary
Staff recommended a rehabilitate‑with‑downstream‑control alternative for the Mountain Tunnel, citing feasibility, lower cost compared with bypass or reline options, and operational benefits; the work will require multiple outages and a multi‑year CEQA/NEPA process and construction schedule stretching into the mid‑2020s.
PUC staff presented an update Nov. 14 on the Mountain Tunnel — a roughly 19‑mile conveyance constructed between 1917 and 1925 — and recommended proceeding with the rehabilitate alternative with downstream control.
Dan Wade summarized inspection results from a recent shutdown and three evaluated options: rehabilitate, reline, and bypass. Staff and technical advisory groups recommended the rehabilitate option with downstream control because it meets 95 percent of conveyance capacity criteria, reduces hydraulic/erosion risks, improves access and maintenance, and is significantly less costly than the other alternatives.
Wade outlined key components of the…
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