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PUC staff: Calaveras Dam excavation reveals additional ancient landslides, likely raising costs and schedule
Summary
PUC project managers reported newly exposed landslide features at the Calaveras Dam site that require substantial additional excavation and stabilization work; staff said they will complete a time-and-cost impact analysis by January 2014 and warned current contingency may be insufficient.
The San Francisco Public Utilities Commission received a technical update from staff on the Calaveras Dam repair project that identified newly exposed ancient landslide features requiring substantial additional work and likely increasing costs and schedule.
At the commission meeting Julie Labonte, a project lead, said crews have completed roughly half the excavation and the project is about 58% complete by expenditure. She reported that a lower geologic feature recently exposed has been confirmed as an ancient landslide and will require over-excavation of roughly 25 feet beneath the new spillway footprint. That work is likely to add about 135,000 cubic yards of excavation and about 7,000 cubic yards of low-density…
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