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Contractor Cleared to Start Tunnel On Hetch Hetchy System Program

Publication Date: 4/6/2010
Author: J.T. Long
Format: HTML

Description:
Contractors on the centerpiece of San Francisco’s $4.6-billion improvement to the Hetch Hetchy Water System were given notice to proceed on April 1. The five-mile subterranean Bay Division Water Delivery Tunnel planned for under the San Francisco Bay will replace two 1920s and 1930s era pipelines with one 9-ft-dia welded steel pipeline bored as deep as 100 ft under the bay’s floor. The new tunnel will be more secure in an earthquake and a tunnel-boring machine will minimize environmental damage.

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