Crystal Springs/San Andreas Transmission System Improvements Construction Management
The Crystal Springs/San Andreas Transmission System is a raw water transmission system conveying water from the Lower Crystal Springs Reservoir to the San Andreas Reservoir. HDR is providing construction management and inspection services on the project, designed to increase the conveyance capacity of the system and provide increased reliability through seismic upgrades.
HDR is monitoring improvements on all aspects of the project. One primary area is the Crystal Springs/San Andreas Pipeline, where improvements include relining approximately 1,100 linear feet (LF) of pipeline downstream from the Crystal Springs Pumping Station with carbon fiber reinforced polymer or steel, and replacing approximately 1,500 LF of inlet structures and pipeline to the San Andreas Reservoir. The work requires constructing approximately 10,000 LF of new gravel access roads, 24,000 LF of clear and grub access to the existing pipeline alignment, repairing approximately 900 LF of cement mortar lining inside the pipeline, repairing approximately 350 linear feet of coating at exposed pipeline sections at drainage above creek crossings at drainage crossings, installing bridges and culverts for access road creek crossings at multiple locations, and installing seismic pipe joints at lateral service connections to accommodate ground movement.
Extensive improvements were also monitored at Upper Crystal Spring Dam, Crystal Springs Outlet Structures No. 1 and 2, Crystal Springs Pumping Station, and San Andreas Outlet Structures No. 2 and 3.