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SFPUC reports slides at Calabrio Dam; design change will produce large spoil volumes and raise costs
Summary
Deputy director Deep Bajwa told the commission that newly discovered slides beneath the observation hill require widening excavations to a two‑to‑one slope on both sides, producing roughly 1.6 million cubic yards of permanently disposed spoils and 1.3 million cubic yards of staged material and increasing project costs and schedule risk.
Deep Bajwa, deputy director overseeing the Water System Improvement Program update, told the San Francisco Public Utilities Commission that geologic slides discovered under the observation hill at the Calabrio Dam require a design change that will materially increase spoil volumes, cost and schedule risk.
"It will generate extra 1,600,000 cubic yard of spoils which needs to be disposed of permanently," Bajwa said, adding that an additional 1,300,000 cubic yards will be staged temporarily and then used in dam…
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