Commuters and visitors traveling on Hwy 280 and Hwy 92 near the Crystal Springs and San Andreas reservoirs may notice bright yellow booms floating in the water in the coming weeks.
These booms are deployed as part of construction of the $4.6 billion Water System Improvement Program to repair, replace and seismically upgrade the Hetch Hetchy Regional Water System.
The booms are silt curtains which block biological species (animals and plants) from entering the work zones and protect water quality by containing disturbed sediment.
This summer, divers will begin underwater work on the outlet structures and pipelines that move water from the reservoirs into the drinking water system. These seismic upgrades will take place at depths of over 100 feet. All watercraft and materials entering the reservoirs are carefully screened to prevent non-native species and contaminants from entering the water.
The work is part of the Crystal Springs/San Andreas Transmission System Upgrade Project and is expected to be complete in 2013.
The Crystal Springs Reservoir System serves as the emergency water supply for over one million people in San Mateo and San Francisco counties.
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