Proposed Action and Alternatives
The Final Supplement to the Final Environmental Impact Statement (EIS) identifies several alternatives to extend Runway 13/31 at Gnoss Field Airport as proposed by Marin County, the owner and sponsor of Gnoss Field Airport. These alternatives include Alternative B (Sponsor’s Proposed Project) - extend Runway 12/31 1,100 feet to the north; Alternative D - extend the runway by 860 feet to the north and 240 feet to the south; and a new FAA Preferred Alternative E not evaluated in the June 2014 Final EIS - shift the runway 106 feet to the north and extend the runway 300 feet to the north.
The existing parallel taxiway would be extended to the full length of the extended runway under Alternatives B, D, or E while maintaining the existing runway-to-taxiway separation distance of 155 feet. Under Alternatives B, D, or E, drainage channels would be extended to drain the additional runway and taxiway pavement, and existing levees would be extended to protect the longer runway and taxiway from flooding. Under Alternatives B, D, or E the existing Precision Approach Path Indicator (PAPI) navigational aids would be relocated to appropriate locations to function with the longer runway.
This Final Supplement to the Final EIS also evaluates an Alternative A - No Action Alternative, as required by the National Environmental Policy Act. An Alternative C – extend the runway by 1,100 feet to the south – was initially considered but not evaluated in detail as explained in the Final Supplement to the Final EIS.
The Final Supplement to the Final Environmental Impact Statement for the proposed extension of Runway 13/31 has been issued.
The Notice of Availability of the Final Supplement to the Final EIS was published in the Federal Register on March 6, 2020.
The Federal Aviation Administration may sign a Record of Decision on the Final Supplement to the Final EIS after 30 days have elapsed since the publication of the Notice of Availability of that document in the Federal Register.
Marin County will evaluate whether any changes to its Certified Final Environmental Impact Report are required after the FAA issues a Record of Decision on the Final Supplement to the Final EIS.