Gnoss Field Airport Runway Extension

Marin County, California

As a subconsultant to Landrum and Brown, Foothill Associates conducted preliminary site assessments and prepared Environmental Impact Statement (EIS)/ Environmental Impact Report (EIR) analyses and documentation to accurately assess and document the foreseeable direct, indirect and cumulative impacts associated with the proposed Marin County Airport (Gnoss Field) runway and taxiway extensions, as well as drainage realignments and the construction of levees to protect the runway extension from flooding. We conducted a biological assessment and performed focused surveys for special-status species in conjunction with other subcontractors on the 213-acre project site. As part of the wetland delineation, we conducted a field review with the U.S. Army Corps of Engineers that verified the extent of the jurisdictional Section 10 and 404 waters, including wetlands on the site. Approximately 74 acres of a diverse array of wetland features including depressional, seasonal, and estuarine wetlands were delineated on the site. Foothill Associates also provided oversight, analysis, and documentation preparation services for the joint EIR/EIS, in which the County of Marin is the California Environmental Quality Act (CEQA) Lead Agency and the Federal Aviation Administration (FAA) is the National Environmental Policy Act (NEPA) Lead Agency.


Existing biological communities were mapped.


Impacts to habitat.


Wetland impacts of one alternative.