C-2A V -22

pen ouse u lic eetinf or the

ransition from C A to C Aircra atNaval Air Station North Island, CA and

Naval Station Norf olk, V A

P lease provide comments on the ra nvironmental Assessment

W ELCO ME

Photo credit: Kaitlyn E. Eads

ransition C A reyhound to ne Navy sprey at e isting est Coast and ast Coast logistics support centers eplace aging C A aircra ith Navy aircra stablish a Navy training s uadron for pilots and aircre stablish a maintenance school for maintenance personnel Construct renovate and maintain facilities to accommodate

Navy s uadron aircra and personnel ake ad ustments to personnel levels increases or decreases Conduct Navy flight training operations

A year period beginning in ith facility renovations and personnel actions ith the rst aircra deliveries in

Provide facilities and functions for the transition from aging C A to Navy aircra to meet updated operational re uirements carries more eight a longer distance re uires more aircra lder C A reaching the end of its service life

reduced availability Support the Navy s defense re uirements under itle U S C

Section

ogistics support centers Naval Air Station North Island CA

Naval Station Norfolk A light training occurs at home base air elds in national airspace

and at secondary air elds

Nav 22 Lo istics ission elivery of cargo mail and passengers bet een shore

installations and aircra carriers at sea

ulti mission capability to perform vertical and short take offs and landings to remote locations and ships

1 nited States ode Section 2 he Navy shall be organi ed trained and e uipped primarily for prompt and sustained combatincident to operations at sea It is responsible for the preparation of naval forces necessary for the effective prosecution of ar e cept as other ise assigned and in accordance ith integrated oint mobili ation plans for the e pansion of the peacetime componentsof the Navy to meet the needs of ar

Location urpose and Needroposed Action

hen

NAS North sland eneral ro ect Area NS Norfolk eneral ro ect Area

ro ect vervie

N a v y V - 2 2Photo C redit: B el l - B oein g

Summary of Alternative 1 and Alternative 2

N A S N orth I s l a n d N S N orf ol k

A l tern a tiv e 1 A l tern a tiv e 2 A l tern a tiv e 1 A l tern a tiv e 2Navy C-2A Squadrons - - - -Navy V -22 Fleet Squadron 1 1 1 1Navy V -22 Training Squadron 1 - - 1Total Aircra ( Change* ) 23 ( + 13) 18 ( + 8 ) 15 ( -2) 20 ( + 3)P ersonnel ( Change* ) 731 ( + 34 1) 551 ( + 161) 4 55 ( -126) 635 ( + 54 )

Total Annual Aircra perations( P ercent Change* )

+ 14 % + 7% 0 % + 8 .5%

acility Construction enovation( square f eet)

156,0 0 0 10 2,220 62,153 9 6,10 0

Pavement enovation pansion( acres)

35 24 24 36

* Change f rom No Action Alternative

Aircraft ransitionhe Navy ill replace aging C A aircra ith Navy aircra at both

NAS North Island and NS Norfolk under Alternative and Alternative

sta lish rainin S uadronhe Navy ill establish a Navy leet raining S uadron re uiring

– Increase of aircra – Increase of personnel – Increase of annual aircra operations – Proposed facilities include aircra hangar additional aircra parking and flight training device

Alternative 1Training Squadron and Maintenance School at NAS North Island

Alternative 2Training Squadron and Maintenance School at NS Norf olk

No Action Alternativehe proposed action ould not occur aseline for measuring the

environmental conse uences of Alternative and Alternative

NAS North sland roposed acilities

NS Norfolk roposed acilitiesC-2A V -22

Alternatives

Photo credit: U .S. Navy Photo credit: a L Anthon

Key

Operational Noise

Acoustic Nigh me Adjustment

Day/Night Average Sound Level

MidnightNoonMidnight

MidnightNoonMidnight

KeyOperational NoiseAcoustic Evening AdjustmentAcoustic Nigh me AdjustmentCommunity Noise Equivalent Level

SEL = 88.1 dBA

Lmax = 76.3 dBA

SEL and Lmax

Source: Blue Ridge Research and Consulting, LLC

Noise Modelinguantif in Noise

Noise one llustration

Noise Assessment

Changes in Noise Levels

Computer Model• he model uses actual aircra noise measurementsInput data includes:• Aircra type• Number of operations• Flight tracks• Po er se ngs• Aircra speed• Terrain• Temperature• Altitude• elative humidity• ngine maintenance testingNoise contours are generated and presented on a map

• Analy ed CN noise contours for areas surrounding NAS North Island• Analy ed N noise contours for areas surrounding NS Norfolk• Studied multiple points of interest for additional analysis during the follo ing scenarios – Sleep disturbance – Maximum sound level

1. Less than 65 dB DNL/CNEL is generally considered compatible for most uses

2. 65-75 dB DNL/CNEL noise zone is an area where some land use controls are needed

3. 75 and greater dB DNL/CNEL noise zone requires the greatest degree of land use controls

75 an

d gre

ater

dB D

NL

65-7

4 dB D

NL

64 an

d les

s dB D

NL

1 2

3

d arel percepti le d uite noticea le+ 10 dB: Perceived as twice as loud

Photo credit: D. Weigel

Day-Night Average Sound Level (DNL) - NS Norfolk onl

• Used to determine long-term community response to aircra noise and land use compatibility• A hour cumulative noise exposure metric• A decible d ad ustment is added to noise events occurring bet een P and A

Community Noise Equivalent Level (CNEL) -NAS North sland onl

• Used to determine long-term community response to aircra noise and land use compatibility in California• A hour cumulative noise e posure metric • A d ad ustment is added to noise events occurring bet een P and 7 AM• A 5-dB adjustment is added to noise events occurring bet een P and P

Sound Exposure Level (SEL) - NS Norfolk NAS North sland

• epresents the total noise energy of a single event such as flyover as if it occurred in one second• Used to assess the potential for sleep disturbance

How the Navy Assesses Noise

Alternative 1 N L contours compared to the No Action Alternative Alternative 2 N L contours compared to the No Action Alternative

• No perceptible difference in noise levels in surrounding community• Small increase in number of flight operations• No change to Naval ase Coronado AICUZ Program land use compatibility recommendations

Aircraft Noise Assessment – NAS North sland

Alternative 1 DNL contours compared to the No Action Alternative Alternative 2 DNL contours compared to the No Action Alternative

• No perceptible difference in noise levels in surrounding community• No or small increase in number of flight operations• No change to NS Norfolk AICUZ Program land use compatibility recommendations

Aircraft Noise Assessment – NS Norfolk

Photo credit: Sadowski Photo credit: SadowskiPhoto credit: Brian P . Miller Photo credit: U .S. Navy

Air elds and Airspace No change proposed to e isting airspace

Airspace management and local air tra c ould not be affected by minor increase in air eld operations

Noise No perceptible difference in noise levels in surrounding communities

Small change in number of flight operations

No change to Naval ase Coronado and NS Norfolk AICUZ Program land use compatibility recommendations

u lic ealth and Safet No change to clear ones accident potential ones or air eld

safety procedures

No change to public or children s health and safety

Air ualit• missions increase ould be negligible

• missions ould be belo applicable regulatory limits

ultural esources• No adverse effect to historic properties

a ardous aterials and aste• inor increase ould be managed through established handling procedures

Socioeconomics• Positive short term economic impact

• Population increase less than no impacts to housing childcare or schools

• No disproportionate effects on minority or lo income populations

oastal one ana ement• Consistent ith coastal one policies under state coastal management programs

ransportation• Short term increase in construction tra c

• ess than increase in e isting daily tra c

iolo ical esources• Negligible impact to habitat ildlife marine species and bird animal aircra strike ha ard potential

• NAS North Island Not likely to adversely affect estern sno y plover and California least tern Navy consulting ith U S ish and ildlife Service

• NS Norfolk No endangered species present

ater esources• inimal impacts to ground ater and surface ater ith minimi ation measures

nfrastructure inor increases in utility demand Utilities su cient to meet

additional demand

Summar of otential mpacts –NAS North sland and NS Norfolk

Negligible impacts to the natural or human environment

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