The Calaveras Dam Replacement Project is a $621 million project to build a new 220 foot high earth and rock fill dam downstream of the existing dam for the San Francisco Public Utilities Commission. The reservoir currently retained by the existing dam was lowered to less than 40% of the normal operating capacity in 2001 due to seismic concerns. The replacement project is part of the SFPUC’s $4.6 billion Water System Improvement Program to repair, replace, and seismically upgrade the aging pipelines, tunnels and reservoirs in the Hetch Hetchy Regional Water System. CJA has a contract with the joint venture of Dragados USA, Flatiron and Sukut Construction to perform the foundation grouting of the rock underlying the new dam.
The scope of the foundation grouting program consists of two Production Curtain Rows, four in an isolated reach, Verification Holes, Stitch Grouting, and Transverse Cutoffs to allow a unique sequencing.