Updated Final FAA DVO SEIS - Public Hearing 08-12-2019.pptgnossfieldeis-eir.com/pdf/Updated Final...

Date:

Federal Aviation

Administration

Public Hearing

Draft

Supplement to theFinal Environmental ImpactStatement

Extend Runway 13/31

Gnoss Field Airport

August 22, 2019

Gnoss Field Airport

2Federal AviationAdministration

August 22, 2019Extend Runway 13/31

Supplement to the Final EIS – Public Hearing

I. Introduction

• County of Marin:

Airport Project Sponsor

• Federal Aviation Administration:

Approve/Disapprove Airport Layout Plan Change

NEPA Lead Agency – Approve EIS

• Landrum & Brown:

Environmental Consultant for EIS

Gnoss Field Airport




II. Purpose of Public Meeting

• Update the public on the status of the EnvironmentalImpact Statement (EIS)

• Receive public comments on the Draft Supplementto the Final EIS (SEIS)

Gnoss Field Airport




EIS/EIR Processing and Status Update

Marin CountyPreparesFinal EIR

CONDUCTPUBLIC

HEARING2012

Respond toAgency/Public

Comments

Agency/PublicCirculation

Notice of

Availabilityof Draft EIS/EIR &

Public Hearing

Prepare Draft

EIS & EIR

Detailed

Environmental

Analysis

CONDUCTSCOPING

DevelopPreliminaryRange of

Alternatives

Baseline DataCollection

ISSUE NOTICEOF INTENT &NOTICE OF

PREPARATION

Identify Purpose& Need

ProjectIdentification

Marin County is Here

FAADetermines

Supplement tothe Final EIS is

Required

Final EIRAvailabilityNov 2013

Marin CountyCertifies EIR

Feb 2014

FAAPreparesFinal EIS

Final EISAvailabilityJune 2014

Marin CountyUpdates Final

EIR (if needed)

Marin CountyProject Decision

Gnoss Field Airport




FAA Signs/IssuesRecord of Decision

Goal – Fall 2019

FAA Issues FinalSupplement to the

Final EISGoal – Fall 2019

Notice of

Availabilityof Final

Supplement to theFinal EIS

Goal - Fall 2019

Consider Agency/Public Comments

Prepare UpdatedPurpose andNeed Working

Paper2018

Consider Agency /Public Comments

FAADetermines

Supplement tothe Final EIS is

Required

2015Circulate Purpose

and NeedWorking Paper for

Agency/PublicComment

2016

PreparePurpose and

Need WorkingPaper

CONDUCTPUBLIC

MEETING2016

Circulate UpdatedWorking Paper for

Agency/PublicComment

CONDUCTPUBLIC

MEETING2018

Prepare DraftSupplement to the

Final EIS2018 - 2019

Agency/PublicCirculation

2019

CONDUCTPUBLIC

HEARING2019

Respond toAgency/

Public Comments

EIS Processing and Status Update

Gnoss Field Airport




III. Status of the EIS

• FAA released the Final EIS in June 2014, but didnot issue a Record of Decision

• FAA notified Marin County in January 2015 that anupdated aviation forecast and Supplement to theFinal EIS were needed

Gnoss Field Airport




III. Status of the EIS

• FAA published the Purpose and Need WorkingPaper in April 2016 for public review and comment.

• Identified a different, less demanding, criticalaircraft, and identified needed runway extension as300 feet instead of 1,100 feet.

• Commenters stated that additional investigation ofVisual Flight Rules flights and fuel receipts wouldshow additional activity of jet aircraft with longerrunway length requirement.

• Marin County and FAA agreed to review additionaldata

Gnoss Field Airport




III. Status of the EIS• FAA published the Updated Purpose and Need

Working Paper in February 2018 for review andcomment

– February 2018 Working Paper consistent with results of 2016Working Paper

– 300’ runway extension justified for current critical aircraft

• Family of turboprop aircraft with wingspan at least 49 feet but <79 feet

• approach speed < 121 knots, (airport reference code B-II)

• FAA prepares and publishes the Draft Supplement tothe Final EIS (SEIS)• Receive and Review Comments• Publish Final SEIS• Issue Record of Decision

Gnoss Field Airport




Gnoss Field

• One Runway (13/31) - 3,300Feet

• 82,730 Takeoff/Landing a Year

• Single and Twin EnginePropeller Aircraft, SmallBusiness Jets

• System of Levees ProtectRunway from Flooding

• Airport has operational noiseabatement procedures

IV. Existing Airport

N

Gnoss Field Airport




IV. Existing Airport-Noise Abatement

N

Gnoss Field Airport




Gnoss Field

• Typical Aircraft that useGnoss Field Airport -Single and Twin EnginePropeller Aircraft, SmallBusiness Jets

IV. Existing Airport

1 Source: FAA Advisory Circular 150/5300-13A “Airport Design”

Table 1-1AIRPORT REFERENCE CODES FOR AIRCRAFT TYPICALLYOPERATING AT GNOSS FIELD AIRPORT

AIRPORTREFERENCE CODE1

AIRCRAFTCHARACTERISTICS

EXAMPLE AIRCRAFT TYPE

A-I

Approach Speed:Less than 91 knots

Wingspan:Less than 49 feet

Cessna 172

B-I

Approach Speed:91 knots or greater, but

less than 121 knotsWingspan:

Less than 49 feet

Cessna 525

B-II

Approach Speed:91 knots or greater, but

less than 121 knotsWingspan:

49 feet or greater, butless than 79 feet

Beechcraft Super King Air 200(family grouping of critical aircraft)

Gnoss Field Airport




Need for Sufficient Runway Length

• Existing runway length (3,300 feet) cannot fullyaccommodate the existing aviation activity, asrepresented by the family grouping of critical aircraftthat regularly uses the Airport under hot weatherconditions (Turboprop aircraft with wingspan at least 49 feetbut <79 feet, approach speed < 121 knots, airport referencecode B-II)

• The purpose of the proposed runway extensionproject is to: allow existing aircraft, as represented bythe family grouping of critical aircraft at Gnoss FieldAirport, to operate without operational weightrestrictions under hot weather conditions

V. Purpose and Need

Gnoss Field Airport





• The “critical aircraft” is the most demanding aircraft interms of the physical dimensions of the airport such as thelength and width of runways and taxiways, that regularlyuses an airport*

• Regular use of an airport is defined as 500 or moreitinerant operations (takeoffs and landings) of the criticalaircraft*

• Runway length determination is based on the requirementsof the critical aircraft

*Definitions based on FAA Order 5090.3C Field Formulation of the National Plan ofIntegrated Airport Systems (NPIAS) and FAA Advisory Circular 150/5000-17 Critical Aircraftand Regular Use Determination

V. Purpose and Need

Gnoss Field Airport





• For FAA runway length calculation purposes, hotweather is defined as the mean daily maximumtemperature of the hottest month

• Mean daily maximum of hottest month = 82 degrees Fin July, August, and September per National Oceanic& Atmospheric Administration data

• Existing runway length (3,300 feet) can result inoperational weight restrictions for some moredemanding aircraft in hot weather

• Aircraft must either reduce fuel or reduce thepassengers and/or cargo

V. Purpose and Need

Gnoss Field Airport




• Shift Runway 13/31 106 feet to the north and extendthe runway 300 feet to the north

• Shifting runway keeps entire project within current airportproperty boundary

• Extend the corresponding taxiway to the full length ofthe runway

• Construct standard Runway Safety Areas for B-IIaircraft

• Levee extension and realignment of drainage

• Re-program the navigational aids that pilots use toland at the Airport to reflect the extended runway

VI. FAA’s Preferred Alternative

Gnoss Field Airport




VII. Proposed Runway Improvements

Gnoss Field Airport




• Alternative A: No Action

• Alternative B (Sponsor’s Proposed Project): Extend runway to thenorthwest by 1,100 feet

• Alternative D: Extend runway to the southeast by 240 feet and to thenorthwest by 860 feet

• Alternative E (FAA’s Preferred Alternative): Shift Runway northwest by 106feet and extend runway to the northwest by 300 feet

VIII. Alternatives Considered

Alternative A

Gnoss Field Airport




Alternative B

Alternative D

Alternative B

Gnoss Field Airport




Alternative E

Gnoss Field Airport




IX. Alternative RejectedAlternative C: Extend runway southeast by 1,100 feetNot carried forward for further analysis in EIS because:

– Greater wetland impacts– Operational Difficulties– Closer to Residential Areas– Higher Cost including off-airport property acquisition

Gnoss Field Airport




Noise

• Federal significant noise threshold in decibelsCommunity Noise Equivalent Level (dB CNEL) is65 dB CNEL

• No homes currently exposed to 65 dB CNEL

• No significant noise impact under Alternative B,Alternative D, or Alternative E

• No existing homes or planned residential areasexposed to 65 dB CNEL under any alternative

X. Environmental Consequences

Gnoss Field Airport




X. Environmental ConsequencesWetlands

• No Action - No wetlands impact

• Alternative B (Sponsor’s Proposed Project) - Impact 11.83acres of wetlands

• Alternative D - Impact 12.73 acres of wetlands

• Alternative E (FAA’s Preferred Alternative) - Impact 7.27acres of wetlands

Wetland Mitigation:

• Feasible wetlands mitigation sites identified in Draft SEIS

• Consultation between County and Federal Agencies mayidentify other mitigation options

Gnoss Field Airport




Threatened and Endangered Species

• Salt Marsh Harvest Mouse & California Clapper Rail (Ridgeway’s Rail)

• Habitat Impacts

– No Action: No Impact

– Alternative B (Sponsor’s Proposed Project): Permanent removal of6.88 acres of wildlife habitat and temporary removal of 16.05 acres ofhabitat.

– Alternative D: Permanent removal of 8.24 acres wildlife habitat andtemporary removal of 18.43 acres of habitat.

– Alternative E (FAA’s Preferred Alternative): Permanent removal of 5.60acres of wildlife habitat and temporary removal of 12.74 acres of habitat.

• Habitat Mitigation

– Mitigation options identified in Draft SEIS

– Consultation between County and Federal Agencies may identify othermitigation options


Gnoss Field Airport




• Air Quality• Water Quality• Floodplains• Farmlands• Energy Supply &

Natural Resources• Compatible Land Use• Socioeconomic Impacts• Visual Resources (Including

Light Emissions &Visual Impacts)

• Hazardous Materials• Coastal Resources• Wild and Scenic Rivers• Construction Impacts• Secondary Impacts• Cumulative Impacts

Areas of No Significant Environmental Impact


Gnoss Field Airport




XI. Next Steps

• Document available at www.gnossfieldeis-eir.com

• Three ways to comment on the Draft SEIS:- Make a comment at Public Hearing today

- Write a comment and leave it in the comment box

- Send a comment to Doug Pomeroy, FAA on or beforeSeptember 6, 2019

Mr. Doug PomeroyFederal Aviation AdministrationSan Francisco Airport District Office1000 Marina Boulevard, Suite 220Brisbane, CA 94005-1835Telephone: 650-827-7612 Fax: (650) 827-7635

Updated Final FAA DVO SEIS - Public Hearing 08-12-2019.pptgnossfieldeis-eir.com/pdf/Updated Final...

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