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NCCWD Project Photo 1

North Coast County Water District Water Transmission Pipeline Project IS/MND and Biological Assessment

Pacifica, San Mateo County, 2008 – 2011

This project, located in the City of Pacifica and in unincorporated San Mateo County, consisted of the construction of potable water pipelines to provide the State Route 1 Devil’s Slide tunnels with water. The project extended pipelines from the North Coast County Water District’s existing infrastructure through Shamrock Ranch and beneath Shamrock Creek to the Devil’s Slide tunnel project boundary. California red-legged frog, a federally listed species, is known to occur in the creek and nearby ponds.

TRA conducted a biological survey of the project area in 2008 and in 2009 prepared the Biological Assessment required by Caltrans for submittal to the USFWS for issuance of a Biological Opinion on the project’s impacts to California red-legged frogs. TRA also coordinated preparation of the Historic Property Survey Report and Area of Potential Effect (APE) map for the property pursuant to Section 106 of the National Historic Preservation Act. TRA maintained close coordination with Caltrans District 4 engineers, biologists, and archaeologists for this project.

TRA provided permit assistance to the District for impacts to a federally listed endangered species, potential impacts to riparian areas, and a Local Agency Formation Commission (LAFCo) service boundary exemption.

In addition to the BA, TRA completed an IS/MND in 2009 that addresses the impacts associated with the construction and operation of potable water pipelines to the State Route 1 Devil’s Slide tunnels for fire suppression, landscaping, and for the tunnel’s Operations and Maintenance Building. The primary issues of concern included potential construction impacts to special status species, jurisdictional wetlands, and to cultural resources in the area.

TRA conducted biological monitoring of the site during project construction in 2010 to ensure required mitigation measures were implemented to protect California red-legged frog.

Lead Agency/Client: North Coast County Water District