PURPOSE OF OPEN DAY:

1
PURPOSE OF OPEN DAY

• To display material about recent council work on
  management of aircraft noise from Ardmore
  Aerodrome
• Noise contours
• Possible restrictions on some activities that are
  sensitive to aircraft noise within noise contours
• To find out what the community thinks about this
  material
• Talk to one of the Council staff or consultants
  here at the open day
• Fill out a feedback form

2
How Can Aircraft Noise Be Managed?

• There are four generally accepted methods
  available to manage aviation activities with a
  view to avoiding remedying or mitigating aircraft
  noise
• Zoning and rules in District Plans New Zealand
  Standard NZS68051992 recommends Ldn dBA noise
  contours to manage aircraft noise together with
  land use restrictions within those contours
• Noise Management Plans
• Operational Requirements eg Civil Aviation
  Authority
• Designations in District Plans

3
WHAT ARE NOISE CONTOURS FOR?

• 1 To Manage Noise Emissions from Aircraft
  Movements
• Plan Change No.6 introduced a Rule (6.14.9.1) to
  the Councils District Plan that noise emissions
  from Aircraft Movements shall not exceed Ldn 65
  dBA outside the Air Noise Boundary and Ldn 55 dBA
  outside the Outer Control Boundary shown on the
  Planning Maps.

4
WHAT ARE NOISE CONTOURS FOR?

• 2 To identify areas which will be subject to
  high and moderate cumulative levels of aircraft
  noise
• Council has said it will introduce a Proposed
  Plan Change that will introduce land use
  restrictions on activities sensitive to aircraft
  noise within the Ldn noise contours.
• At this stage Council is consulting for work on
  that draft Proposed Plan Change it has not yet
  made any decisions about what the land use
  restrictions should be.
• The Environment Court has asked the Council to
  look at what the effects would be of allowing
  350,000 aircraft movements each year at the
  Aerodrome rather than the 275,000 the Council,
  AAL and others had reached agreement on.
  Therefore the Council has mapped the 350,000
  noise contours.

5
What Happens Next?

• If you would be affected by the possible land use
  restrictions that the Council is considering then
  you should tell the Council what you think about
  these.
• If you believe you are or would be affected by
  aircraft noise from Ardmore Aerodrome and/or have
  opinions about how Council should address
  aircraft noise (eg number of aircraft movements)
  then you should also tell the Council what your
  thoughts are.
• You can give informal feedback to the Council via
  an informal feedback form here, or write to the
  Council up until 14 October 2005.
• This display information and a feedback form are
  also available on Papakura District Councils
  website www.papakura.govt.nz under
  Consultations.
• The Council will then revise the draft possible
  provisions, and will consult further on those
  revised provisions.
• Council intends publicly notifying a Proposed
  Plan Change in early 2006 and any person will
  then be able to make a submission under the
  Resource Management Act 1991.

6
Noise Measurement - Decibel scale page 1

• Pressure Scale is Impractical
• Decibel scale chosen for convenience
• Hearing response is logarithmic rather than
  linear

Typical sound pressure levels
7
Sound Exposure Level SEL page 2

• SEL is used for measuring single event noise such
  as an aircraft take-off
• The SEL value contains the same amount of
  acoustic energy over a normalised one second
  period as the actual noise event under
  consideration
• SEL provides a measure of the noise energy of
  a single event

8
Noise Measurement Leq 1 hour page 3

• Obtained by adding the noise energy (SEL) from
  each aircraft event over a one hour period
• Gives a measure of noise exposure over the one
  hour period

9
Noise Measurement -Day/Night Level Ldn page4

• Measure of Overall Noise Exposure
• Takes into Account
• No. of Noise Events
• Loudness of Each Event
• Increased Sensitivity at Night
• Main Noise Metric for Aircraft Noise
• Obtained by averaging the twenty four Leq 1hr
  values over a given day with
• a 10dB penalty applied to the night-time Leq 1hr
  (10pm and 7am) to allow for the increased
  sensitivity to noise during night-time

10
Noise Measurement Day/Night Level Ldn page 5
11
Noise Metrics page 7

• Aircraft noise is quantified in terms of single
  event and cumulative noise metrics. Single event
  metrics are used to describe the noise of a
  single aircraft event such as a single aircraft
  departure or landing. Frequently, individuals
  living or working in the vicinity of airports
  ask, "How loud was that airplane?" Single event
  metrics provide the answer.
• Airport noise regulations in New Zealand and many
  other countries are in terms of cumulative noise
  metrics. These metrics are based upon the single
  event metrics and consider the loudness and
  number of individual aircraft events and the time
  of day that the events occur.

12
Sound Exposure Level (SEL) page 8

• Sound Exposure Level (SEL). Another metric that
  is reported for aircraft flyovers is the Sound
  Exposure Level (SEL). It is computed from dBA
  sound levels. Referring again to the top of
  Figure 1 the shaded area, or the area within 10
  dB of the maximum noise level, is the area from
  which the Sound Exposure Level is computed. The
  SEL value is the integration of all the acoustic
  energy contained within the event.
• This metric takes into account the maximum noise
  level of the event and the duration of the event.
  Single event metrics are a convenient method for
  describing noise from individual aircraft events.
  This metric is useful in that airport noise
  models contain aircraft noise curve data based
  upon the SEL metric. In addition, cumulative
  noise metrics such as LEQ and Ldn can be computed
  from SEL data.
• Noise exposure from operations on all the flight
  paths commonly used at Ardmore are used in the
  calculation of cumulative noise exposure.

13
Cumulative Metrics page 9

• Equivalent Noise Level (LEQ). LEQ is the sound
  level corresponding to a steady-state A-weighted
  sound level containing the same total energy as a
  time-varying signal over a given sample period.
  LEQ is the "energy" average noise level during
  the time period of the sample. It is based on
  the observation that the potential for a noise to
  impact people is dependent on the total
  acoustical energy content of the noise. It is
  the energy sum of all the sound that occurs
  during that time period. This is graphically
  illustrated in the middle graph of Figure 1. LEQ
  can be measured for any time period, but is
  typically measured for 15 minutes, 1 hour or
  24-hours.
• Day Night Noise Level (Ldn). Cumulative noise
  metrics have been developed to assess community
  response to noise. They are useful because these
  scales attempt to include the loudness of each
  event, the duration of these events, the total
  number of events and the time of day these events
  occur into one single number rating scale.
• Ldn is a 24-hour, time-weighted energy average
  noise level based on the A-weighted decibel. It
  is a measure of the overall noise experienced
  during an entire day. The phrase
  "time-weighted," refers to the fact that noise
  that occurs during certain sensitive time periods
  is penalized for occurring at these times. In
  the Ldn scale, those events that take place
  during the night (10 p.m. to 7 a.m.) are
  penalized by 10 dB. This penalty was selected to
  attempt to account for the higher sensitivity to
  noise in the nighttime and the expected decrease
  in background noise levels that typically occur
  in the nighttime. Ldn is specified as the
  criterion noise metric in New Zealand Standard
  6805. Ldn is graphically illustrated in the
  bottom of Figure 1.
• The use of noise metrics is an attempt to
  quantify community response to various noise
  exposure levels. The public reaction to
  different noise levels has been determined from
  extensive research on human responses to exposure
  of different levels of aircraft noise.

14
(No Transcript)
15
Community Annoyance - Transportation Noise page 11
16
Community Responses to Aircraft Noise page 12
17
Community Responses to Aircraft Noise page 13
18
Day/Night Level - Ldn and Speech Interference
page 14
19
Background and Timeline page 1

• September 2001 - Council publicly notifies
  Proposed Plan Change No.6 (PC6)
• September 2001 Ardmore Airport Ltd (AAL) lodge
  a Notice of Requirement to modify their
  Designation for the Aerodrome in the Papakura
  District Plan
• July 2002 independent commissioners hear
  submissions on PC6 and AALs Notice of
  Requirement
• January 2003 - The Independent Commissioners
  issued their report and recommendations to the
  Council on Plan Change No.6 and the AAL Notice of
  Requirement

20
Background and Timeline (page 2)

• August 2003 Council issued its decision
• Rule 6.14.9.2 (Maximum Noise Level from any
  Aircraft) would be modified to reduced the
  maximum permissible noise level from any aircraft
  from SEL 125 dBA to SEL 100dBA between the hours
  of 8.00pm and 7.00am Monday to Saturday or at any
  time on Sundays or Public Holidays.
  Certification of the noise levels would be
  required from AAL
• The requirement for acoustic insulation for all
  dwellings would be modified to being required
  within the Ldn 63 dBA noise contour of the
  Aerodrome rather than the Ldn 65 dBA contour
  recommended by the Commissioners

21
Background and Timeline (page 3)

• August 2003 Council Decision (continued)
• More restrictions were to be put on circuit
  training circuit training would not be
  permitted between 8.00pm and 7.00am on Sundays
  and Public Holidays and on other days circuit
  training would not be permitted between 10.00pm
  and 7.00am
• The ability for the Noise Management Plan to
  place more stringent requirements on the
  operations of the Aerodrome was clarified
• Environmental Working Group to be run by Council
  and to meet at least every 3 months.

22
Background and Timeline (page 4)

• August Council Decision (continued)
• No additional land use restrictions to apply with
  the Rural Papakura or the Rural Takanini/Drury
  Zones because additional dwellings and
  subdivision already require a Discretionary
  Activity Resource Consent. An additional
  criterion added to discretionary activities
  within the noise contours whether the proposed
  activity will adversely affect the operations of
  the Aerodrome.
• Noise contours around the Aerodrome based on
  restricting the Aerodrome to a maximum of 275,000
  Aircraft Movements per year including ex-Military
  Jet Aircraft.
• Rule 6.14.9.4 Ex-Military Jet Aircraft Movements
  restricted to 170 movements per calendar year
  averaged over a 3 year period 180 movements in
  any 1 calendar year and no simultaneous or
  parallel take-offs

23
Background and Timeline (page 5)

• August 2003 Council Decision (continued)
• Rule 6.14.9.6 restricts the noise of Engine
  Testing measured at the boundary of any
  residential zone or within 20m of any dwelling
  existing as at 19 September 2001
• Rule 6.14.9.7 restricts airshows to one show
  within any calendar year and with flying
  programmes for the show limited to a period of
  not more than 3 days plus 2 specified days
  practice. Practice for a show is allowed only in
  the 2 weeks prior to the show. The hours
  permitted for an airshow are shown in the table

24
Background and Timeline (page 6)

• September - October 2003 - Appeals lodged with
  the Environment Court on PC6 and AAL Notice
• November 2004 Draft Consent Order to settle the
  appeals agreed between the majority of the
  parties to the appeals. Council, Ardmore Airport
  Ltd, Manukau City Council, Ardmore Residents
  Action Group, University of Auckland, JK
  Antunovich, J S Southcombe and JD Edwards
  agreed to
• Amend the PC6 to state that consistent with the
  principles for airport planning contained in NZS
  68051992 the Council will notify a further plan
  change introducing additional land-use
  restrictions within the Air Noise Boundary and
  the Outer Control Boundary by way of a future
  Plan Change within 9 months of PC6 becoming
  Operative.

25
Background and Timeline (page 7)

• Draft Consent Order (continued)
• Introduce a definition of Activities Sensitive to
  Aircraft Noise means household units,
  residential activities, comprehensive residential
  development, institutional activities, studio
  warehousing, temporary household units,
  rehabilitation facilities, pre-school/education
  facilities, schools, other educational
  facilities, child care centres and other care
  centres, hospitals, other health care facilities,
  resthomes and homes for the aged.
• Amend PC6 so that any resource consent
  application for an Activity Sensitive to Aircraft
  Noise the noise contours would be assessed as to
• whether the nature, size and scale of the
  proposed activity is likely to lead to potential
  conflict with and adverse effects upon the
  operation of the Aerodrome and
• whether the design and construction of any
  structure to be used for the proposed activity
  would achieve an internal noise environment of
  Ldn 40 dBA while providing adequate ventilation.

26
Background and Timeline (page 8)

• Draft Consent Order continued
• Replace the Ardmore Environmental Working Group
  and the Ardmore Airport Noise Complaints
  Committee with the Ardmore Airport Noise
  Consultative Committee and refining the
  objectives of that Committee.
• Amending Rule 6.14.9.2 (Maximum Noise Level from
  any Aircraft) from the Council decision of SEL
  100dBA to SEL 115 dBA and providing for
  exceptions of aircraft based at the Aerodrome on
  1 July 2004. The Hawker Hunter would be permitted
  up to a maximum of 58 movements per annum out of
  the limit of 180 movements per annum specified
  for the Ex-Military Jet Aircraft

27
Background and Timeline (page 9)

• Draft Consent Order (continued)
• Aircraft brought to the Aerodrome for maintenance
  with a limit of 16 takeoffs and takeoffs and
  landings to come out of the limit of 180
  movements per annum specified for Ex-Military Jet
  Aircraft.
• Extension of permitted hours for Circuit training
  and scheduled flights from 10.00pm to 10.30pm
  during daylight saving hours Monday-Saturday.
• Clarification that night training is further
  restricted on Sunday evenings between 8.00pm
  Sunday and 7.00am Monday.
• Additional restriction that jet aircraft that do
  not meet a specific International Civil Aviation
  Organisation noise standard or the equivalent
  stage 3 FAA standard are not permitted to
  operate between 10.00pm and 7.00am.

28
Background and Timeline (page 10)

• Draft Consent Order (continued)
• Amend the requirement for AAL to offer to pay for
  acoustic insulation for houses existing as at 19
  September 2001 to apply within the Ldn 65 dBA
  contour rather than within the Ldn 63dBA contour.
• 14 October 2004 Environment Court
• The Ardmore Tenants and Users Group lodge a
  notice with the Environment Court that they do
  not agree to the Consent Order agreed by the
  majority of parties and wish the matter to be
  heard by the Environment Court. Jet Imports Ltd
  and NZ Warbirds Association Ltd also do not agree
  to the Consent Order.
• Ardmore Tenants and Users Group sought noise
  contours based on 350,000 movements per year and
  recognition of the Aerodromes capacity to
  accommodate that number of movements.

29
Background and Timeline (page 11)

• Ardmore Tenants and Users Group and Jet Imports
  sought no restrictions on the number of
  Ex-Military Jet Aircraft movements allowed each
  year.
• Environment Court Interim Decision a decision
  could not be made on the appropriate capacity of
  the Aerodrome or the extent to which restrictions
  should be placed on its capacity in absence of
  land use compatibility planning work being done
• Council needs to look at what the effects would
  be of allowing 350,000 aircraft movements p.a
• Report back to Court by 31 October on the
  progress with a Plan Change

30
How Can You Tell If you Would be Affected by
Possible New Land Use Restrictions?

• First, check to see if you property is within any
  of the noise contours shown on the map here. If
  your property is not within any of the noise
  contours then the Council will not apply any
  restrictions on the use of the land due to
  aircraft noise.
• If your property is within the noise contours
  look to see which contour it is within the Ldn
  65dBA the Ldn 60 dBA or the 55 dBA? Are these
  the contours for 275,000 movements or for 350,000
  movements?
• Read the possible provisions look to see what
  they say about the noise contour that applies to
  your property.
• Tell us what you think about the possible
  provisions and the noise contours.

31
Possible District Plan Land Use Restrictions

• A Definition of Activities Sensitive to Aircraft
  Noise (ASANs) would be introduced
• means household units, residential activities,
  comprehensive residential development, farmstays,
  studio warehousing, temporary household units,
  rehabilitation facilities, pre-school/education
  facilities, schools, other educational
  facilities, child care centres and other care
  centres, hospitals, other health care facilities,
  rest homes and other homes for the aged.

32
Possible District Plan Land Use Restrictions -
within the Air Noise Boundary page 2

• Within the Air Noise Boundary (Ldn 65 dBA
  contour) shown on the Planning Maps ASANs would
  be a prohibited activity with the exception of
• Household units that were legally established
  under the Act and existing at the date of
  notification of the Proposed Plan Change on any
  lot, irrespective of the date the lot was
  created.
• Additions and alterations to ASANs that were
  legally established under the Act and existing at
  the date of notification of the Proposed Plan
  Change would require Discretionary Activity
  resource consent and shall be assessed under
  Assessment Criteria.
• New or additions and alterations to Aviation
  Training facilities within the Ardmore Aerodrome
  Zone would require a controlled activity resource
  consent.

33
Possible District Plan Land Use Restrictions -
within the Air Noise Boundary page 3

• Subdivision of land within the Air Noise Boundary
  (Ldn 65 dBA contour) shown on the planning maps
  would require a discretionary activity resource
  consent with the exception of boundary
  adjustments where no additional titles are
  created.

34
Possible District Plan Land Use Restrictions -
within the Inner Control Boundary page 4

• ASANs on land within the ICB (Ldn 60 dBA contour)
  would require a discretionary activity resource
  consent and be subject to a rule for acoustic
  insulation with the exception of
• Household units that were legally established
  under the Act and existing at the date of
  notification of the Proposed Plan Change on any
  lot, irrespective of the date the lot was
  created.
• Additions and alterations to existing ASANs
  within the ICB would require a restricted
  discretionary activity resource consent subject a
  Rule for acoustic insulation.

35
Possible District Plan Land Use Restrictions -
within the Outer Control Boundary page 5

• ASANs on land within the OCB boundary (Ldn 55 dBA
  contour) would require a restricted discretionary
  activity resource consent and be subject to a
  rule for acoustic insulation with the exception
  of
• Household units that were legally established
  under the Act and existing at the date of
  notification of the Proposed Plan Change on any
  lot, irrespective of the date the lot was
  created.
• Additions and alterations to existing ASANs
  within the OCB, which would require a controlled
  activity resource consent and be subject to a
  rule for acoustic insulation.

36
Acoustic Insulation Rule for ASANs within Noise
Contours page 6

• ASAN or additions and alterations to an existing
  ASAN would need to provide
• (i) acoustic insulation and related ventilation
  and /or air conditioning system(s) to achieve an
  internal environment in all habitable rooms (with
  all external doors of the building and all
  windows of the habitable rooms closed) of Ldn 40
  dBA. Where compliance with the design level
  relies on doors and windows being closed,
  alternative approved ventilation in accordance
  with the Building Code shall be provided.
• (ii) upon the completion of the installation of
  acoustic insulation and related ventilation and
  /or air conditioning system(s) as per (i) above,
  the owner would need to provide the Council with
  certificates prepared by
• a suitably qualified and experienced acoustical
  consultant certifying that the acoustic treatment
  measures specified in this rule are sufficient to
  achieve compliance with this rule and have been
  undertaken in accordance with sound practice and
• a suitably qualified and experienced ventilation
  engineer certifying that the ventilation measures
  specified in this rule are sufficient to achieve
  compliance with this rule and have been
  undertaken in accordance with sound practice.

37
Assessment Criteria for ASANs within Noise
Contours page 7

• Internal Noise Environment
• The need to achieve an acceptable internal noise
  environment for habitable rooms and rooms for
  sleeping and whether the proposal provides for
  the relevant acoustic treatment measures in Rule
  8.31.7 or suitable alternative measures and
  whether the nature or degree of any
  non-compliance with the acoustic standard in Rule
  8.31.7 is insignificant.
• Without limiting the generality of (a), whether
  or not the design, construction and materials of
  any structure to be used would achieve an
  acceptable internal noise environment for
  habitable rooms and rooms for sleeping with all
  external doors and windows of the building(s)
  closed.
• Whether or not other measures are proposed to
  achieve an acceptable internal noise environment
  for all such rooms.
• Internal Air Quality
• The need for adequate ventilation as part of any
  acoustic treatment measures.

38
Assessment Criteria for ASANs within Noise
Contours page 8

• Acoustic Treatment Measures in Additions
• The reasonableness of requiring acoustic
  treatment measures (including measures for
  internal air quality purposes) in existing rooms,
  or whether such measures should be limited to the
  addition.
• Removal of Acoustic Treatment Measures
• The desirability of ensuring required acoustic
  treatment measures are not removed without
  consent.
• Nature, Size and Scale of Development
• Whether having regard to all the circumstances
  (including location in relation to Ardmore
  Aerodrome, likely exposure of the site to
  aircraft noise, noise attenuation and ventilation
  measures proposed, and the number of people to be
  accommodated), the nature, size and scale of the
  development is likely to lead to potential
  conflict with and adverse effects upon Ardmore
  Aerodrome activities.

39
Summary of Possible Restrictions
40
What Happens Next?

• If you would be affected by the possible land use
  restrictions that the Council is considering then
  you should tell the Council what you think about
  these.
• If you believe you are or would be affected by
  aircraft noise from Ardmore Aerodrome and/or have
  opinions about how Council should address
  aircraft noise (eg number of aircraft movements)
  then you should also tell the Council what your
  thoughts are.
• You can give informal feedback to the Council via
  an informal feedback form here, or write to the
  Council up until 14 October 2005.
• This display information and a feedback form are
  also available on Papakura District Councils
  website www.papakura.govt.nz under
  Consultations.
• The Council will then revise the draft possible
  provisions, and will consult further on those
  revised provisions.
• Council intends publicly notifying a Proposed
  Plan Change in early 2006 and any person will
  then be able to make a submission under the
  Resource Management Act 1991.