SAN FRANCISCO (CBS/AP) – Work is underway on a new 5-mile tunnel under the San Francisco Bay that will transport billions of gallons of water to cities on the Peninsula.
The tunnel, which crews began constructing on Friday, is part of a $4.6 billion project to overhaul the Hetch Hetchy water system. The system serves about 2.5 million customers in the San Francisco Bay area.
Water is currently transported across the bay on decaying pipelines supported on wooden trestles.
The new pipeline will be underground, making it more secure in case of an earthquake. It will run between Newark and Menlo Park and cost about $570 million.
Officials are expecting delivery in about eight months of a tunnel boring machine from Japan that will cut through the silt, clay and rock at the bottom of the Bay.
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