South Sewer Main Replacement - Phase II

The City of Los Altos is currently working on three sewer main repair and replacement projects in order to ensure the ongoing efficiency of the City’s sewer needs. The scope of work to be completed includes, but is not limited to the following:

• Potholing of existing utilities
• Replacement of existing 12-inch sanitary sewer mains with 15-inch and 18-inch sewer mains
• Replacement of 6-inch sanitary sewer mains with 10.75-inch mains
• Lining of sanitary trunk sewer mains
• Pipe sag repairs
• Disconnecting and reinstating of sewer lateral connections
• Traffic control and bypass pumping of sanitary sewer flow

The City’s contractor, California Trenchless, Inc. (CTI), will use the pipe bursting method, open cut-method and the cure in-place pipe lining method during construction. The pipe bursting method, even though it is a trenchless method, still requires excavation of trenches/pits for the insertion and pulling of the pipe bursting head. Also, CTI will excavate pits to disconnect and re-connect the sewer laterals that are connected to the sewer mains that were replaced. The lining of the three trunk sewer mains (two on Springer Road and one on El Camino Real) do not require any excavation. The liner is inserted from one manhole to another manhole. All of these methods of pipe replacement and repairs require bypass pumping system set-up.

Projected Community Impact
The construction of these projects is currently underway and estimated to end in the Spring of 2014. The contractor will provide traffic control devices during construction, including detour signs as necessary.

For questions about this project, contact the Engineering Division at (650) 947-2780.