Proposed Action and Alternatives
The Draft Supplement to the Final 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 Environmental Impact Statement - 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 Draft Supplement to the Final Environmental Impact Statement 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 Draft Supplement to the Final Environmental Impact Statement.
Draft Supplement to Federal Aviation Administration Final Environmental Impact Statement issued July 2019.
Final Supplement to Federal Aviation Administration Final Environmental Impact Statement anticipated to be released in November 2019.
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 Environmental Impact Statement.
The Federal Aviation Administration may sign a Record of Decision on the Final EIS and Supplement to the Final EIS after 30 days have passed since the issuance of the Supplement to Final Environmental Impact Statement.