Alameda Siphon No. 4

Jifco constructed three thousand feet of new 66 inch diameter pipe that extends across Sunol valley from the existing Coast Range tunnel to the Irvington tunnel, consisting of a seismically-designed pipe in the fault rupture zone, which allows the new pipeline to move over 4 feet in any direction, and a tunnel crossing under Alameda Creek, with blending and pipeline cross-overs in the case of a major pipe rupture during a major earthquake.

Constructing 2 each 126” x 96” Girder Tees, 96” Wyes, 72” Tees and 66” Ells for cross-over structure at the Coast Range tunnel, in the event of a major rupture in Alameda Siphon numbers 1,2,3 or 4.