Water Transmission Pipeline Project

The North Coast County Water District (NCCWD) is the CEQA lead agency for the Water Transmission Pipeline project to install two pipeline alignments to connect the California Department of Transportation’s (Caltrans) Devil’s Slide Tunnels to the NCCWD’s existing potable water infrastructure. Currently the Caltrans Devil’s Slide Tunnels do not have potable water service and these pipelines are needed to supply the tunnel with potable water for fire suppression, landscaping, for the tunnel’s Operations and Maintenance Building and to provide drinking water for the public using the former Devil’s Slide roadway trail.


Two disjunct pipeline alignments are being proposed to provide a “looped” water line which would prevent water from becoming stagnant within the line. One alignment, the West Alignment, is proposed within the
roadbed of State Route (SR) 1 from approximately the Pacifica City boundary line to the Devil’s Slide Tunnel bridge. The other alignment, the East Alignment would start at the intersection of
Peralta and Rosita Roads in the City of Pacifica and extend through Shamrock Ranch to the northeastern Caltrans Devil’s Slide Tunnel construction easement boundary and project
boundary fence. The potable water pipeline within the Devil’s Slide Tunnel project boundary was included and approved as part of the Devil’s Slide Environmental Impact Report/Environmental
Impact Statement.

NCCWD Water Transmission Pipeline Project East and West Alignments- Initial Study and Mitigated Negative Declaration
November 2009