guide to assessing road traffic noise
TRANSCRIPT
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Guid t assssing rad-trac
nis using NZS 6806 r stathighwa asst imprmnt
prjcts
Version 1.0, October 2011
This guide describes the processes to be used onNZTA asset improvement projects or assessing and,
where required, determining appropriate mitigation
or road-trac noise. These processes are based on
NZS 6806:2010. The guide also gives eect to the
NZTAs state highway project development and
delivery standards, in particular SM030 minimum
standard Z/19 Social and Environmental
Management.
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Guid t assssingrad-trac nisusing NZS 6806 rstat highwa asstimprmnt prjcts
1.0NZ Transport Agency
October 2011
ISBN 978-0-478-38042-2 (online)
ISBN 978-0-478-38043-9 (print)
Copyright: 2011 NZ Transport Agency
National Oce
50 Victoria Street
Private Bag 6995
Wellington 6141
New Zealand
T 64 4 894 5400F 64 4 894 6100
Front cover image:
Transparent noise barrier by SH1 at St Marys Bay, Auckland
Cntnts
Intrductin 1
Assssmnt mthd 3
Trminlg 4
NZTA prcsss 6
Rprting 10
Bst practicabl ptin 12
Watriw Cnnctin 16
Scp wrks 17
Dsignatin cnditins 18
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NZ Transprt Agnc | Road-trac noise assessment | SP/M/023 | October 2011 / version 1.0 1
Intrductin
BackgroundThe NZ Transport Agency (NZTA) aims to be a good neighbour, taking social and environmental
responsibility seriously, including management o noise. This is reected in external and internal
strategy and policy documents that the NZTA is required to implement, including the NZTAs
Environmental plan1. These documents are consistent with the requirements o the Land Transport
Management Act 2003 and Resource Management Act 1991 (reer to fgure 1).
1 Transit New Zealand (2008)
Environmental plan, version 2.
www.nzta.govt.nz
The NZTAs Environmental plan sets ormal objectives regarding noise rom the state highway
network, including:
N2 Determine reasonable noise requirements when seeking new or altering existing
designations including when designating existing local roads by using RMA procedures
New Zealand Standard (NZS) 68062 prescribes the methods and criteria that the NZTA uses to
ulfl this objective (except where existing designation conditions require compliance with another
standard).
NZS 6806 was published by Standards New Zealand on 30 April 2010 and is a process-based
standard or measuring, predicting, assessing and, where required, determining appropriate
mitigation or road-trac noise.
2 Standards New Zealand (2010)
NZS 6806:2010Acoustics road-
trafc noise new and altered roads.
www.standards.co.nz
FIGURe 1 Rlatinship this guid t k NZTA plic and stratg
dcumnts and thr guids
Land
Transpor
tManagem
entA
ct2003 ResourceM
anagement
Act1991
Stat highwa nis barrir
dsign guid
Guid t stat highwa
rad surac nis
Stat highwa guid t acustics
tratmnt buildings
Statmnt Intnt 20112014
Guid t assssing rad-trac nis using Nw Zaland Standard 6806
r stat highwa asst imprmnt prjcts
Nw Zaland Standard 6806:2010
Acoustics road-trac noise new and altered roads
Stat Highwa enirnmntal Plan
Grnmnt
Plic Statmnt
2012/13 2018/19
IMPROVING ENVIRONMENTAL SUSTAINABILITY AND PUBLIC HEALTH IN NEW ZEALAND
ENVIRONMENTAL PLAN
VERSION 2 JUNE 2008
http://www.nzta.govt.nz/resources/environmental-policy-manual/docs/environmental-plan.pdfhttp://www.standards.co.nz/http://www.standards.co.nz/http://www.nzta.govt.nz/resources/environmental-policy-manual/docs/environmental-plan.pdf -
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2 NZ Transprt Agnc | Road-trac noise assessment | SP/M/023 | October 2011 / version 1.0
Purpose o this document
This guide describes the processes to be used on NZTA projects or assessing and, where required
determining appropriate mitigation or, road-trac noise, based on NZS 6806. The aim is to
consistently and eciently apply NZS 6806, within the ramework o the NTZAs Project
management manual (SM011)3, State highway proessional services contract proorma manual
(SMO30)4, and minimum standards Z/65, Z/186, Z/197, Z/208, Z/219 and PSG/1310. Specifcally,
this guide is to be used or road-trac noise assessment as required by Z/19. Some o the
minimum standards are to be updated or consistency with this noise assessment process. This
guide should be read in conjunction with NZS 6806.
NZS 6806 should result in better social and environmental outcomes or stakeholders, with
integrated design o noise mitigation measures. However, or high-risk improvement works (reer
to page 7 and the Risk management process manual 11), signifcantly more eort is needed rom the
project team at an earlier stage in the process, compared with previous assessments using the
Transit guidelines12. This guide is aimed in particular at NZTA project managers, acoustics
specialists and planners:
NZTAproject managers now need to schedule and budget or the dierent processes brought
about by NZS 6806.
Acoustics specialists need to adopt new assessment methods, and are now required to prepareinormation about mitigation options in new ormats and provide analysis o the acoustics
beneftcost ratio (BCR).
Planners need to adapt the way designation conditions or noise are drated.
Foreachproject,asuitably qualied expert (such as an environmental manager, planner or
other person with a holistic viewpoint) now has responsibility or the fnal determination o the
best practicable option (BPO) or noise mitigation.
Supporting tools, templates and examples or the application o NZS 6806 are available on the
NZTAs Transport Noise website: www.acoustics.nzta.govt.nz. This includes an online eLearning
training module on road-trac noise, including application o NZS 6806.
NZTA Transport Noise website
NZTA eLearning NZS 6806 case study
4 NZTA (2011) State highway
proessional services contract
proorma manual (SM030).
www.nzta.govt.nz
7 NZTA (2010) Minimum standard
Z/19 Social and Environmental
Management. www.nzta.govt.nz
3 NZTA (2010) Project
management manual (SM011).
www.nzta.govt.nz
10 NZTA (2010) StandardProessional Services Guideline
PSG/13 Social and Environmental
Management. www.nzta.govt.nz
11 NZTA (2004) Risk management
process manual. www.nzta.govt.nz
8 NZTA (2009) Minimum standard
Z/20 Project Feasibility Reports.
www.nzta.govt.nz
6 NZTA (2009) Minimum standard
Z/18 Scoping Report.
www.nzta.govt .nz
5 NZTA (2009) Minimum standard
Z/6 Scheme Assessment Report.
www.nzta.govt.nz
9 NZTA (2009) Minimum standard
Z/21 Large and Complex Projects
I&R to D&PD Phase Handover
Checklist.www.nzta.govt.nz
12 NZTA (1999) Appendix 6:
Guidelines or the management o
road trac noise state highway
improvements in Planning policy
manual. www.nzta.govt.nz
http://www.acoustics.nzta.govt.nz/http://www.nzta.govt.nz/resources/state-highway-professional-services-contract-proforma-manual/http://www.nzta.govt.nz/resources/state-highway-professional-services-contract-proforma-manual/standards/docs/sm030-z19-v2-1mar10.pdfhttp://www.nzta.govt.nz/resources/project-management-manual/pmm.htmlhttp://www.nzta.govt.nz/resources/state-highway-professional-services-contract-proforma-manual/guidelines/docs/sm030-psg13-v2-1mar10.pdfhttp://www.nzta.govt.nz/resources/risk-management-process-manual/http://www.nzta.govt.nz/resources/state-highway-professional-services-contract-proforma-manual/standards/docs/Z20.pdfhttp://www.nzta.govt.nz/resources/state-highway-professional-services-contract-proforma-manual/standards/docs/Z18.pdfhttp://www.nzta.govt.nz/resources/state-highway-professional-services-contract-proforma-manual/standards/docs/Z18.pdfhttp://www.nzta.govt.nz/resources/state-highway-professional-services-contract-proforma-manual/standards/docs/Z6.pdfhttp://www.nzta.govt.nz/resources/state-highway-professional-services-contract-proforma-manual/standards/docs/Z21.pdfhttp://www.nzta.govt.nz/resources/state-highway-professional-services-contract-proforma-manual/standards/docs/Z21.pdfhttp://www.nzta.govt.nz/resources/planning-policy-manual/docs/planning-policy-manual-noise-guidelines-1999.pdfhttp://www.nzta.govt.nz/resources/planning-policy-manual/docs/planning-policy-manual-noise-guidelines-1999.pdfhttp://www.nzta.govt.nz/resources/state-highway-professional-services-contract-proforma-manual/standards/docs/Z21.pdfhttp://www.nzta.govt.nz/resources/state-highway-professional-services-contract-proforma-manual/standards/docs/Z6.pdfhttp://www.nzta.govt.nz/resources/state-highway-professional-services-contract-proforma-manual/standards/docs/Z18.pdfhttp://www.nzta.govt.nz/resources/state-highway-professional-services-contract-proforma-manual/standards/docs/Z18.pdfhttp://www.nzta.govt.nz/resources/state-highway-professional-services-contract-proforma-manual/standards/docs/Z20.pdfhttp://www.nzta.govt.nz/resources/risk-management-process-manual/http://www.nzta.govt.nz/resources/state-highway-professional-services-contract-proforma-manual/guidelines/docs/sm030-psg13-v2-1mar10.pdfhttp://www.nzta.govt.nz/resources/project-management-manual/pmm.htmlhttp://www.nzta.govt.nz/resources/state-highway-professional-services-contract-proforma-manual/standards/docs/sm030-z19-v2-1mar10.pdfhttp://www.nzta.govt.nz/resources/state-highway-professional-services-contract-proforma-manual/http://www.acoustics.nzta.govt.nz/ -
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NZ Transprt Agnc | Road-trac noise assessment | SP/M/023 | October 2011 / version 1.0 3
Assssmnt mthd
BackgroundRoad-trac noise rom state highways has previously been assessed using the Transit guidelines
(appendix 6 in the NZTAs Planning policy manual). One o the weaknesses o the Transit guidelines
is that they oten led to noise mitigation solutions to achieve perect compliance with the specifed
noise limits, resulting in poorly integrated designs and at the expense o value-or-money. In some
instances this has resulted in poor visual and urban design outcomes, and construction o
substantial barriers or the sake o 1 dB attenuation, which is an insignifcant beneft.
The NZTAs Value Assurance Committee13 has provisionally adopted NZS 6806 or all new and
altered state highway projects (except where existing designation conditions require compliance
with another standard). NZS 6806 is to be used in place o the Transit guidelines. This decision is
subject to review ollowing urther verifcation that value-or-money solutions do result rom
NZS 6806 when tested against an extended range o projects.
The assessment method in NZS 6806 requires consideration o a number o noise mitigationoptions depending on the scale o a project. For a transitional period o two years until May 2012,
the NZTA requires that assessments using NZS 6806 include consideration o a noise mitigation
option complying with the Transit guidelines.
Criteria
Unlike the Transit guidelines, NZS 6806 does not set rigid noise limits. It gives categories (A, B and
C) o noise criteria, and requires that the best practicable option (BPO) be identifed to mitigate
road-trac noise. This process promotes integrated design encompassing a wide range o actors
as well as noise levels. The upper category (C) provides a backstop against adverse health eects
such as sleep disturbance, by requiring the insulation o houses i the external noise would not be
suciently reduced using the BPO.
Catgr Critrin Altrd rads Nw rad Nw rad
> 75,000 AADT
(i in Auckland)
A Primar 64 dB LAq(24h)
57 dB LAq(24h)
64 dB LAq(24h)
B Scndar 67 dB LAq(24h)
64 dB LAq(24h)
67 dB LAq(24h)
C Intrnal 40 dB LAq(24h)
40 dB LAq(24h)
40 dB LAq(24h)
Noise mitigation options are to be assessed and, i practicable, the category A criterion should be
achieved. I this is not practicable, then mitigation should be assessed against category B. However,
i it is still not practicable to comply with categories A or B then mitigation should be implemented
to ensure the internal criterion in category C is achieved.
Mitigation costs
Mitigation options determined using NZS 6806 will typically comprise low-noise road suraces and
noise barriers. I these are not sucient, then building-modifcation such as mechanical ventilation
may be required so windows can remain closed. Use o the new criteria in NZS 6806 to date
(September 2011) has shown:
noisemitigationcostsfornewroadsinurbanareasaregenerallylessthanthenoisemitigation
costs that would arise i the Transit guidelines were applied
dependingontheBPO,noisemitigationcostsformajoralterationstoexistingroads(altered
roads) in urban areas may be more than the noise mitigation costs that would arise i the Transit
guidelines were applied.
13 Value Assurance Committee
minutes, 28 January 2010.
TABLe 1 NZS 6806 critria
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Trminlg
NZS 6806 introduces several new terms. A summary o key terms is provided here, but many
have complex denitions and reerence to NZS 6806 is essential.
Altered road
An existing road that is subject to a change in the horizontal or vertical alignment that without
specifc noise mitigation would cause an increase in road-trac noise above thresholds defned in
NZS 6806.
NZS 6806 applies to new and altered roads. It does not apply to existing roads that are not being
altered. An online screening tool to help determine whether or not NZS 6806 applies to a
particular project is provided on the Transport Noise website (www.acoustics.nzta.govt.nz ).
Maintenance works such as resuracing are not classifed as an altered road project.
Building-modication mitigation
Measures to reduce the eects o internal trac noise levels in buildings include:
acoustic insulation
voice amplifcation systems
building relocation.
Cluster
Any teaching or medical acility; or a minimum o three protected premises and acilities (PPFs)
that are on the same side o the road being assessed, and are not more than 100m rom another
PPF in that group.
Decibels (dB LAeq(24h)
)
Road-trac noise levels under NZS 6806are measured in decibels (dB) as the
A-requency-weighted, time-average level
over 24 hours (LAeq(24h)
). This is the same
unit as the old Transit guidelines.
Design year
10 to 20 years ater the opening o a new or altered road.
Do-nothing
The scenario o no change to the existing road, but with trac growth that would have occurred at
the design year.
Do-minimum
The scenario at the design year o a new or altered road having been constructed, but with no
specifc noise mitigation measures implemented.
Free-eld
The assessment position or road-trac noise has changed. Under the Transit guidelines, road-
trac noise is assessed outside at 1m in ront o a building, including noise reected rom the
building itsel (a acade level). Under NZS 6806 road-trac noise is now assessed at the position
o the building acade excluding noise reected rom the building, as i it wasnt there (a ree-feld
level). A ree-feld level (NZS 6806) is approximately 2.5 dB less than a acade level (Transit
guidelines). To provide consistency within uture assessments, the noise limits rom the Transitguidelines will be reduced by 2.5 dB so that they can then be applied directly to ree-feld levels
under NZS 6806.
http://www.acoustics.nzta.govt.nz/http://www.acoustics.nzta.govt.nz/ -
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Protected premises and acilities (PPFs)
Spaces in buildings used or:
residential activities
marae
overnight medical care
teaching (and sleeping) in educational acilities
playgrounds that are part o educational acilities that are within 20m o buildings used or
teaching purposes.
PPFs are the locations where road-trac noise is assessed and or which noise mitigation measures
may be required. NZS 6806 does not apply to PPFs in urban areas that are located more than
100m rom the edge o the closest trac lane or the new or altered road, or PPFs in rural areas
located more than 200m rom the edge o the closest trac lane.
Structural mitigation
Measures to reduce noise such as:
low-noise road surace materials noise barriers (including walls, ences and bunds).
Urban/rural
An urban environment is a main urban area, a satellite urban community or an independent urban
community (Statistics New Zealand). Any area that is not urban is classifed as a rural environment
or the purposes o NZS 6806. Details o these areas are available rom Statistics New Zealand
(www.stats.govt.nz) and the NZTAs Spatial Viewer (https://spatialviewer.nzta.govt.nz/).
Altered road NZTA Spatial Viewer showing urban and rural areas
Structural mitigation
Building-modicationmitigation
http://www.stats.govt.nz/https://spatialviewer.nzta.govt.nz/https://spatialviewer.nzta.govt.nz/http://www.stats.govt.nz/ -
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NZTA prcsssThe ull assessment process detailed in NZS 6806 requires signifcantly more eort than previous
assessments using the Transit guidelines. However, or many routine NZTA projects, noise
mitigation is not warranted and neither is a ull assessment using NZS 6806. To determine whereNZS 6806 requires mitigation, the NZTA has adopted a three-tiered approach to noise
assessment, as shown in fgure 2. For many projects the Tier 1 and 2 assessments can be quickly
and simply conducted by NZTA project sta without the need or acoustics specialists. Tier 3
assessments are not required on all projects, but do require the use o acoustics specialists.
The let-hand side o fgure 2 shows NZTA state highway project stages. The appropriate tier o
noise assessment varies or each stage, depending on the risk associated with the project. Generally,
or larger higher-risk projects, the more detailed Tier 2 and 3 assessments will be required in earlier
stages. The noise risk associated with the project is determined rom the Tier 1 assessment. The
Tier 1 and 2 noise assessments are conducted separately or each project option. The Tier 3 noise
assessment is only conducted or the preerred option determined in the Scheme Assessment.
Stag Nis assssmnt tirItm
INveSTIGATIoN
Scping
Scoping Report
Schm Assssmnt 1
(easibility/scoping update)
Schm Assssmnt 2
Scheme Assessment Report (SAR)
Tir1Riskassssmnt
Tir3N
ZS6806assssmnt
Tir2NZS6806scrn
ing
High risk
projects
only
Project
dependent
All
projects
High risk
projects
only
Project
dependent
FIGURe 2
Assssmnt prcss
Project
dependent
oPeRATeA
ND
MAINTAIN
DeSIGN
oprat and MaintainConsent compliance
Cnstruct
Implement mitigation
Dsign
Outline Plan o Works
FeASIBILITy
Fasibilit
Project Feasibility Report
Schm Assssmnt 3
Assessment o Environmental Eects
(AEE) / Notice o Requirement
CoNSTRUCT
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NZ Transprt Agnc | Road-trac noise assessment | SP/M/023 | October 2011 / version 1.0 7
14 NZTA (2010) Social and
Environmental Management Form,
PSF/13. www.nzta.govt.nz
Tier 1 Noise risk assessment
A Tier 1 assessment indicates the noise risk associated with a project option. The assessment is a
simple process that can be completed in a matter o minutes by a non-specialist. It is based solely
on the volume o trac at the opening year and the number o protected premises and acilities
(PPFs) within 200m o the proposed alignment. An estimate o these parameters will usually be
sucient to determine the appropriate category in table 2.
The Tier 1 assessment orms part o the Social and Environmental Screen (SES) required by
minimum standard Z/19. The results o the assessment or each project option are to be reported
on separate copies o orm PSF/1314, together with the assessments o other potential social and
environmental eects required by Z/19. As the project progresses through Feasibility, Scoping and
the beginning o Scheme Assessment, the assessment or each current option should be reviewed
and updated as necessary. No reporting other than PSF/13 is required or Tier 1 assessments.
Beside each owchart on the ollowing pages is a list o the tools available to NZTA sta and
consultants. Many o these tools are on the Transport Noise website (www.acoustics.nzta.govt.nz).
Within the website, results rom tools can be saved in a central location or each project.
Instructions or doing this are provided on the website.
Dtrmin th annual aragdail trac (AADT) at thpning ar.
estimat hw man prtctdprmiss and acilitis (PPFs) arwithin 200m th alignmnt.
Dtrmin th rall riskusing th tabls blw.
Cmplt th Scial andenirnmnt Scrn (SeS) nrm PSF/13.
Spatial Viewer
https://spatialviewer.nzta.govt.nz/
PSF/13 & PSG/13
www.nzta.govt.nz
Indiidual rating Annual arag dailtrac (AADT)
Prtctd prmiss andacilitis (PPFs)
Nt applicabl (NA) 50,000pd > 200 PPFs
orall rating Indiidual ratings (AADT/PPFs)
Nt applicabl (NA) eithr NA
Lw risk (L) Bth L
Mdium risk (M) on M and n L r M
High risk (H) on H and n L, M r H
FIGURe 3 Tir 1
TABLe 2 Risk rating
Projects do not always exactly ollow the progression o stages shown in fgure 2. For example, a
project might progress straight rom Feasibility to Scheme Assessment with no Scoping stage, or
there might be a period o several years between Scoping and Scheme Assessment. In these cases,
all relevant tiers o the noise assessment should be completed or reviewed when commencing the
next project stage. For the purposes o noise assessment the Scheme Assessment has been split
into three stages, although the division is not a ormal part o NZTA processes.
http://www.nzta.govt.nz/resources/state-highway-professional-services-contract-proforma-manual/forms/docs/psf13-2011.pdfhttp://www.acoustics.nzta.govt.nz./http://www.acoustics.nzta.govt.nz./http://www.acoustics.nzta.govt.nz./https://spatialviewer.nzta.govt.nz/http://www.nzta.govt.nz/http://www.nzta.govt.nz/https://spatialviewer.nzta.govt.nz/http://www.acoustics.nzta.govt.nz./http://www.nzta.govt.nz/resources/state-highway-professional-services-contract-proforma-manual/forms/docs/psf13-2011.pdf -
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Tier 2 NZS 6806 screening assessment
NZS 6806 only requires mitigation to be considered in clearly defned circumstances. The purpose
o the Tier 2 assessment is to screen out those project options where mitigation is defnitely not
required. The Tier 2 assessment or each project option should take no more than 5 to 10 minutes
to complete by a non-specialist using the screening tool on the Transport Noise website. The
assessment is made on the basis o estimated details o the project (AADT, surace, gradient) and
the relationship to the nearest PPF.
The Tier 2 noise assessment orms part o the Social and Environmental Assessment (SEA)
required by minimum standard Z/19. For each project option, the one-page results sheet rom the
NZS 6806 screening tool should be appended to orm PSF/13. The orm and screening assessment
should be reviewed and updated as necessary as the project progresses. For Scoping Reports and
Scheme Assessment Reports the Tier 2 noise assessment should comprise just PSF/13 and the
appended results sheets. For a project where no mitigation is required then or statutory approvals
a Road-trac Noise Assessment Report should be prepared based on the screening report
template provided on the Transport Noise website.
Idnti urban/rural aras andPPFs
Dtrmin rad/tracparamtrs
Spatial Viewer
https://spatialviewer.nzta.govt.nz/
Screening toolwww.acoustics.nzta.govt.nz
Cmplt SeA n PSF/13.Attach scrning tl rsults
estimat likl mitigatin
Road-trac noise calculator
Noise barrier design guide
Guide to road surace noise*
Guide to acoustics treatment*
www.acoustics.nzta.govt.nz
* In preparation
PSF/13 & PSG/13
www.nzta.govt.nz
ys
N
Ds
NZS 6806rquir mitigatinptins t bdlpd?
FIGURe 4 Tir 2
https://spatialviewer.nzta.govt.nz/http://www.acoustics.nzta.govt.nz/http://www.acoustics.nzta.govt.nz/http://www.nzta.govt.nz/http://www.nzta.govt.nz/http://www.acoustics.nzta.govt.nz/http://www.acoustics.nzta.govt.nz/https://spatialviewer.nzta.govt.nz/ -
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Tier 3 NZS 6806 assessment
A Tier 3 assessment determines the BPO or noise mitigation. This requires an acoustics specialist.
Cnduct nis mdlling rd-minimum scnari
Cmplt Rad-trac NisAssssmnt Rprt rSAR/Aee
Road-trac noise calculator
www.acoustics.nzta.govt.nz
Screening report template
www.acoustics.nzta.govt.nz
BCR spreadsheet
www.acoustics.nzta.govt.nz
Noise mitigation cost upload tool
www.acoustics.nzta.govt.nz
SCHeMe
ASSeSSMeNT2
SCHeMeASSeSSMeNT3
DeSIGN
Updat SeA n PSF/13Prduc Rad-trac NisAssssmnt Rprt r SAR
Prjct tam ll in aluatinmatrix r assssmnt ara
Aran PPFs
ab NZS 6806catgr A?
ys
N
Instigat mitigatin ptins
Calculat BCR r ach ptin
Dtrmin indicati BPo rnis mitigatin
Uplad mitigatin cstcmparisn
Prpar a summar papr rach assssmnt ara
Dtrmin th BPo r nismitigatin
Prduc Rad-trac NisAssssmnt Rprt r Aee
Dlp mitigatin dtailddsign and cnrm that anariatins t mitigatin ar stillth BPo
entr as-built nis mitigatindtails in th RAMM databas
Prduc Rad-trac NisMitigatin Plan (oPW)
Road-trac noise calculator
Noise barrier design guide
Guide to road surace noise*
Guide to acoustics treatment*
www.acoustics.nzta.govt.nz
* In preparation
PSF/13 & PSG/13
www.nzta.govt.nz
Templates and examples
www.acoustics.nzta.govt.nz
Matrix template
www.acoustics.nzta.govt.nz
Report template
www.acoustics.nzta.govt.nz
Road-trac noise calculator
Noise barrier design guide
Guide to road surace noise*
Guide to acoustics treatment*
www.acoustics.nzta.govt.nz
* In preparation
Report template
www.acoustics.nzta.govt.nz
FIGURe 5
Tir 3
SM030, section 8
www.nzta.govt.nz
Drat dsignatin cnditins Model conditions
www.acoustics.nzta.govt.nz
CoNSTRU
CT
Hld a BPo wrkshp rlarg/high-risk prjcts
http://www.acoustics.nzta.govt.nz/http://www.acoustics.nzta.govt.nz/http://www.acoustics.nzta.govt.nz/http://www.acoustics.nzta.govt.nz/http://www.acoustics.nzta.govt.nz/http://www.nzta.govt.nz/http://www.acoustics.nzta.govt.nz/http://www.acoustics.nzta.govt.nz/http://www.acoustics.nzta.govt.nz/http://www.acoustics.nzta.govt.nz/http://www.acoustics.nzta.govt.nz/http://www.acoustics.nzta.govt.nz/http://www.nzta.govt.nz/http://www.acoustics.nzta.govt.nz/http://www.acoustics.nzta.govt.nz/http://www.acoustics.nzta.govt.nz/http://www.acoustics.nzta.govt.nz/http://www.acoustics.nzta.govt.nz/ -
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Rprting
Minimum standard Z/19 Social and Environmental Management (within SM030) will be updated
to provide outline details o the requirements or Tier 1 and 2 noise assessments or NZTA projects.This includes the use o orm PSF/13 to document the Tier 1 assessment as part o the Social
Environmental Screen, and the Tier 2 assessment as part o the Social Environmental Assessment.
The owcharts on the previous pages indicate when results rom the noise assessment should be
recorded on PSF/13. The ollowing provides guidance and examples o how to use that inormation
to complete PSF/13. More detailed guidance can be ound in PSG/13.
Social and Environmental Screen (SES)
The Tier 1 noise assessment is part o the SES or each option. The assessment is limited to the
identifcation o PPFs and consideration o the opening year trac. At this stage, the frst three
columns o PSF/13 should be completed separately or each alignment option.
Issue
The deault text in column A or the row noise should remain unchanged. The ollowing guidanceor the remaining columns only relates to road-trac noise, but additional inormation may also be
required or construction noise.
Efects
The opening year AADT and approximate number o PPFs should be recorded. A brie summary
should be given o the PPFs (urban/rural area), the existing noise environment and a qualitative
description o the predicted new road-trac noise.
Degree o efect
The degree o eect should be reported as the overall risk obtained rom table 2.
optin dscriptin
Scial and enirnmntal Scrn
Issu
Social and environmental
issues
efcts
Describe the potential social and environmental eects o
the option, including where the option may improve social
and environmental outcomes
Dgr fct
H / M / L / NA
Nis
eg construction noise,trac noise,
maintenance noise,
presence o sensitive
receivers (homes,
schools, hospitals).
opning ar AADT 18,000pd
PPFs within 200m 40 huss
Th prjct is a nw rad in an urban rsidntial
ara. Thr ar n signicant xisting nis
surcs in cls prximit t th PPFs and th
nw rad wuld intrduc a clarl nticabl
nw nis surc.
M
TABLe 3 Scial and enirnmntal Scrn xampl Prjct X
15 NZTA (in preparation) State
highway construction noise guide.
www.acoustics.nzta.govt.nz
This example only shows road-trac or operational noise eects. The NZTA guide to state
highway construction noise15 provides similar examples or construction noise eects.
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NZ Transprt Agnc | Road-trac noise assessment | SP/M/023 | October 2011 / version 1.0 11
Social and Environmental Assessment (SEA)
The Tier 2 noise assessment is part o the SEA. At this stage the second three columns o PSF/13
should be completed or each option, building on or updating the SES completed previously. The
SEA should occur beore detailed acoustics computer modelling and determination o the BPO or
noise mitigation are undertaken. The SEA should be updated once the noise mitigation has been
determined.
Requirements
I a designation exists and has noise conditions, the CSVue15 reerence should be given with a brie
summary o the conditions. Objective N2 in the NZTAs Environmental plan should always be listed,
as shown in the example below.
Addressing efects and meeting requirements
The specifc action, i mitigation is required, will usually be to undertake a Tier 3 assessment to
determine the BPO in accordance with NZS 6806. However, i the analysis is advanced at the time
the SEA is completed then more specifc details or mitigation should be provided. The estimated
cost or mitigation cannot be given prior to analysis o options. I rom experience it is considered
likely that mitigation will be required then the estimated cost should be marked TBC (to be
confrmed). Once the BPO has been identifed then the approximate cost or noise mitigation canbe determined using the BCR spreadsheet on the Transport Noise website.
In the example below, noise barriers and low-noise road suraces have been identifed as being the
likely noise mitigation options. Detailed analysis to identiy the BPO or noise mitigation is not
expected at this stage. Indicative calculations or proessional judgement based on knowledge o
similar projects are acceptable to determine likely noise mitigation when the SEA is frst completed.
optin dscriptinScial and enirnmntal Assssmnt
Rquirmnts
List all legal requirements and
relevant NZTA social and
environmental objectives
Addrssing fcts and mting rquirmnts
List actions to be taken to meet specifc social and environmental
requirements and objectives and address all eects identifed. Include an
estimated cost.
Spcic actins estimatd cst($)
Dsignatincnditins:
(CSvu 12345, cnditin 5)
Assssmnt in accrdancwith NZS 6806.
Spcic NZTAbjctis:
(Environmental plan N2)
Dtrmin rasnabl
nis rquirmnts whn
sking nw r altring
xisting dsignatins,
including whn dsignating
xisting lcal rads b
using RMA prcdurs.
Cnduct nis mnitring th xisting
nirnmnt.
Cnstruct an acustics cmputr mdl
and calculat nis lls r: xisting,d-nthing, d-minimum and mitigatin
ptins (including an ptin t cmpl
with th Transit guidlins).
Dtrmin th BPo in accrdanc with
NZS 6806.
Th BPo is likl t includ nis barrirs
and lw-nis rad suracs, but th cst
ths cannt b rliabl stimatd at
this stag.
TBC
15 CSVue (www.csvue.com) is the
online database used by the NZTA
or consent management. Contact
the Environment and Urban Design
Team ([email protected]).
TABLe 4 Scial and enirnmntal Assssmnt xampl Prjct X
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Waterview Connection, Sector 1 South, option 1
Bst practicabl ptin
Key to the NZS 6806 process is the determination o the BPO or noise mitigation. The ollowing
provides more detailed guidance on the actions required or NZTA projects during thedetermination o the BPO. This process should ensure the BPO is determined in a robust and
consistent manner.
WS10-04
WS10-05
WS10-03
WS10-06
WS10-07
WS10-08
WS10-11WS10-10
WS10-12WS10-13
WS10-09
WS10-15
WS10-14
WS10-01
WS10-02
1. The project should be split into discreteassessment areas. In urban
environments separate assessment
areas should be used or each side o
the state highway.
2. The project acoustics specialist should develop a number o noise mitigation options oreach assessment area. These should be documented in a summary paper or each
assessment area using the ormats provided on the Transport Noise website (actual
project examples are also provided on the website). One o the mitigation options must
be designed to comply with the Transit guidelines.
Waterview Connection, Sector 1 North, option 1
Waterview Connection, Sector 1 North, option 2 Waterview Connection, Sector 1 South, option 2
KEY
Category A PPF
Category B PPF
Category C PPF
Barrier (with height in m)
15 assessment areas or theTransmission Gully Project
Close-up o one assessment area
2.0m
3.0m
3.0m
2.0m
Japonic
aCres
Apple
Terra
ce
HuanuiSt
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3. The project acoustics specialist should calculate the BCR or each mitigation optionusing the spreadsheet template available on the Transport Noise website. The relative
merits should be added to the assessment area summary paper.
4. The project acoustics specialist should prepare an assessment matrix or eachassessment area using the template on the Transport Noise website. The acoustics
specialist should fll in the assessment or the acoustics criteria and then circulate the
matrices with the options summary papers to the project team. For each assessment
criteria the matrices include a seven-point qualitative rating rom triple-plus to triple-
minus. Early trials proved that a quantitative scoring system could not correctly balance
the dierent criteria in the matrix, as the appropriate weightings change in each
assessment area. The template allows the assessment criteria to be customised so thatthey are relevant to the specifc project and location. As a minimum the criteria should
cover the actors listed in section 6.3 o NZS 6806.
$50k
$350k
$300k
$250k
$200k
$150k
$100k
$0Option 1 Option 2
Cost
Beneft
Option 3 Option 4
$400k
5. All relevant project team members should complete the matrix. The key responses inaddition to acoustics will usually be the landscape/visual and urban design, although all
other disciplines are important in determining the BPO. The NZTA Asset Manager
should contribute to the matrix to ensure operation and maintenance issues are
adequately considered.
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8. Ideally the BPO will be determined by consensus at the noise mitigation workshop. Inmany cases, minor variants to mitigation options will need to be remodelled ollowing
the workshop and reviewed by specifc workshop participants. I consensus cannot be
achieved then a suitably qualifed expert with a holistic view is responsible or balancing
the dierent considerations and judging which option constitutes the BPO.
Best
practicable
option
P r o
j e c
t
m a n a g e r
Region
al
plan
ning
NZTA acousticsspecialist
Acoustics
Consu
ltation
Stru
ctur
es
Urbandesign
Ecology
Proje
ct
engin
eer
Region
al
mainte
nance
NZTAurbandesignadvisor
Plannin
g
Roa
din
g
Vis
ual
/
land
scape
Construction
Stormwater
Social
6. The responses to the matrices should be collated and reviewed by the project manager,planner and acoustics specialist. I the choice o noise mitigation options is clear-cut on
the basis o the assessment matrices then these may be selected as the BPO. For simple
projects it is envisaged that this will oten be the case. For large, complex and high-risk
projects it will usually be necessary to hold one or more noise mitigation workshops to
review the matrices beore determining the BPO.
7. I necessary, hold a noise mitigation workshop. Precirculate the completed assessmentmatrices to all attendees. Attendees may include:
facilitator
NZTAprojectsta
consultantteam:acoustics,planning,social,consultation,roading,structures,visual/landscape, urban design, construction, ecology, stormwater
NZTAnationaloce:acoustics,urbandesign
NZTAregionaloce:planning,maintenance(regionalmaintenancestaarecriticalcontributors as the long-term perormance o the mitigation depends on practicable
maintenance) acousticsadvisorsfromthecouncilortheEnvironmentalProtectionAuthority(EPA)
(observer only as NZS 6806 is a process rather than perormance based standard, itis benefcial or the regulatory authoritys acoustics advisor to be able to witness theprocess so that they can veriy it was correctly implemented).
Not all o these people will be needed or every noise mitigation workshop, and theapproprite attendees should be determined by the NZTA project manager.
Stakeholder engagement
Stakeholder input is required in this process, including rom those people living adjacent toproposed barriers. Ideally, community opinions will be known when completing assessment
matrices and prior to any noise mitigation workshop. Otherwise, the selected options should
remain subject to confrmation ollowing community consultation ater the workshop.
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Case study Transmission Gully Project
The Transmission Gully Project is a proposed new 27km expressway providing an inland route
between Wellington (Linden) and the Kapiti Coast (MacKays Crossing). An assessment o uture
road-trac noise in accordance with NZS 6806 was conducted or the project in 2010. As a large
project aecting a signifcant number o PPFs, a hal-day noise mitigation workshop was held to
determine the BPO or each o the assessment areas. In accordance with the procedures detailed in
this guide, mitigation options were circulated and assessment matrices completed by the project
team prior to the workshop. Participants at the workshop included all those shown in the diagram
opposite, and the EPA acoustics advisor was present to witness the process. In several cases the
BPO was identifed as being a modifcation to one o the options that had been prepared. The
proposed modifcations were tested in the noise model ater the workshop and reviewed/
confrmed by the aected team members at a ollow-up meeting the next day.
Following the workshop the project acoustics specialist and a member o the planning team visited
all building owners adjacent to proposed noise barriers. This included around 30 households, a
primary school, a preschool, a teen-parent unit and a marae. Wherever practicable, wishes o
neighbours were considered. Individual site inspections also allowed building heights to be refned
in the noise model. Any alterations that
materially aected the BPO identifed at
the noise mitigation workshop were then
reviewed with the relevant team members.
As well as balancing noise and visual
considerations, other positive urban
design outcomes rom this process
included the maintenance o a communitywalkway. Initially the noise barriers were
proposed on property boundaries.
However, an area was identifed where this
would sever an inormal, but heavily used
community walkway on crown land. It was
determined at the workshop that the
barrier could be positioned closer to the
road to maintain the walkway behind, but
that the walkway would need to be
ormally established due to the steep
slope in the remaining space available.
The team liaised with the council, which
agreed to accept the land and establish
the walkway. The adjacent residents alsoconfrmed their support or the walkway.
Noise mitigation workshops
To give eect to the process detailed on the previous pages, a noise mitigation workshop needs to
be well planned and organised. This should include the ollowing:
Theacousticsspecialistshouldcompletethenoisemodellingandprepareasummarypaperand
drat assessment matrix or each area at least one month beore the workshop. Allteammembersshouldcompletetheirpartsoftheassessmentmatricesatleasttwoweeks
beore the workshop.
Completeassessmentmatriceswithcollatedresponsesshouldbecirculatedatleastoneweek
beore the workshop.
Theroomusedfortheworkshopshouldbeconguredforaround-tablediscussion,witha
projection screen to display the options being discussed.
Theworkshopshouldbeledbyafacilitator/integratorwithaholisticview.
TheBPOandreasonsforitagreedattheworkshopshouldbedocumentedandcirculated.
AnysubsequentalterationstotheBPOshouldbereviewedandconrmedbytherelevantteam
members.
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Watriw Cnnctin
The Waterview Connection in Auckland is the
largest roading project in New Zealand in recenttimes. It includes 4.5km o new state highway
connecting SH20 with SH16, o which 2.5km will
be in tunnels, as well as alterations to 7km o the
existing SH16. The section between SH20 and
SH16 is unique in that the new surace road is
expected to carry more than 80,000 vehicles per
day and passes through established residential
urban areas with relatively low existing noise
levels. In contrast, the works to SH16 are on a road
carrying around 130,000 vehicles per day through
an urban area already subject to high road-trac noise levels.
In 2010, the Waterview Connection was one o the frst projects where NZS 6806 was used or
road-trac noise assessment. It was also the frst roading project where the notices o requirementor designations and applications or resource consents were submitted to the Environmental
Protection Authority under the RMA national consenting process. This process has a time limit o
nine months, which restricted the time available or the Board o Inquiry to consider and analyse
the development and implementation o NZS 6806.
In its fnal report, the Waterview Board o Inquiry stated the ollowing concerns:
underNZS6806,PPFsinCategoriesAandBmightexperiencehigherinternalnoiselevelsthan
those in Category C
aperceptionthatNZS6806requiresarigiddevelopmentoftheBPO
concernregardingthebalancestruckinNZS6806betweenenablingthecommunityseconomic
and possibly social wellbeing relative to the social wellbeing and health o directly aected people
aperceptionthatNZS6806doesnotprovideasettestormethodologybutoersguidanceand
recommendations.
It is noted that many Category A and B PPFs in the vicinity o that part o the existing SH16 being
altered as part o the project already receive high internal (and external) noise levels as part o the
current (2011) existing environment.
Despite reerring to the concerns noted above in its fnal report, in its fnal decision on the
Waterview designation conditions the Board o Inquiry imposed the amended designation
conditions proposed by the NZTA (in its comments on the Boards drat decision).
For the majority o the Waterview Connection the operational noise conditions imposed by the
Board are completely consistent with NZS 6806. The only signifcant variation rom NZS 6806 is in
relation to a specifc area (Sector 9) where a section o new surace road expected to carry over
80,000 vehicles per day would be constructed through an established quiet residential
neighbourhood. In its comments on the Boards drat report the NZTA accepted that, due to thelevels o trac involved, the situation in relation to Sector 9 is unique in the New Zealand context
and, accordingly, the NZTA accepted the imposition o noise conditions that would require more
noise mitigation than would be required under NZS 6806.
Under the noise conditions applying to Sector 9 only, regardless o what NZS 6806 category a PPF
alls into, road-trac noise levels inside the PPFs are not to exceed 40 dB LAeq(24h)
, with building-
modifcation mitigation required i structural mitigation is not sucient. The NZTA accepts this
condition is appropriate to manage adverse road-trac noise eects in the unique situation
aecting Sector 9.
The NZTA considers NZS 6806 is a robust tool to help assess what are reasonable levels o road
trac noise, and to help determine appropriate mitigation o the noise eects o new and altered
roads. NZS 6806 was subject to the usual committee process or approval o New Zealand
standards and involved a wide range o stakeholders, many with the publics interest as their
responsibility, together with science experts, who considered and weighed the available evidenceand sought wider input through public submissions.
For uture projects, the model conditions on pages 1921 should be promoted by the NZTA.
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NZ Transprt Agnc | Road-trac noise assessment | SP/M/023 | October 2011 / version 1.0 17
Scp wrks
For a Tier 3 assessment (reer to fgure 5) the ollowing items o work should be perormed by an
acoustics specialist. The templates and spreadsheet reerred to are on the Transport Noise website.
Scheme Assessment 2
IdentifyallPPFs,urban/ruralareasandapplicablecriteriafromNZS6806.
ConductasitevisitandnoisesurveyinaccordancewithNZS6806section5.2,forthepurpose
o veriying the noise model or the existing scenario and quantiying the existing environment.
SubmitallsurveyresultstotheNZTAsEnvironmentandUrbanDesignTeam(EUDT)usingthe
template.
ConstructanoisemodelinaccordancewithNZS6806section5.3fortheexisting,do-nothing
and do-minimum scenarios, and determine noise levels at each PPF.
DeterminetheTransitguidelinesdesigncriteria.
I all PPFs are category A or do-minimum, or all levels are within NZS 6806 section 1.5.2thresholds, use the screening report template to prepare a Road-trac Noise Assessment Report
which will be suitable or both the SAR and AEE. No urther work is required.
I any PPFs are in NZS 6806 categories B or C:
GroupPPFsintoassessmentareasandinvestigatemitigationoptionsinthedo-minimumnoise
model, in accordance with NZS 6806 section 7. One option must meet the Transit guidelines.
UsingtheBCRspreadsheet,calculatethebenet,cost,numberofPPFsineachcategory,and
average noise reduction or each mitigation option relative to the do-minimum scenario.
DetermineanindicativeBPOfornoisemitigation.
UploadcostsofmitigationforNZS6806andTransitguidelinesontothewebsite.
UpdateformPSF/13withtheindicativemitigationandcosts.
UsetheSARreporttemplatetoproduceaRoad-tracNoiseAssessmentReport.
Scheme Assessment 3
Prepareanoisemitigationoptionssummarypaperforeachassessmentarea.
Collateprojectteamresponsestocompletetheevaluationmatrixforeachassessmentarea.
Obtaininputfromstakeholdersdirectlyaectedbymitigationoptions.
DeterminetheBPOfornoisemitigationinaccordancewithNZS6806section6.3,usinga
workshop or large/high risk projects (workshop attendees to include the EUDT).
UsetheAEEreporttemplatetoproduceanupdatedRoad-tracNoiseAssessmentReport.
Prepare/presentevidenceandconferencewithotherexpertsasrequiredfortheRMAprocesses.
Design
Designbarriersandconrmlow-noisesurfaces.Coordinateurbandesignandotherrequirements.
ForallPPFsincategoryCdetermineappropriateacousticstreatment.
ConrmvariationstomitigationarestilltheBPO,obtainingapprovalsasrequiredbythe
conditions.
UsetheOPWreporttemplatetoproduceaRoad-tracNoiseMitigationPlan.
Construct
Conductsiteinspectionstoverifyinstallationoflow-noiseroadsurfacesandnoisebarriers.
ForallPPFsincategoryCverifyacousticstreatmenthasbeeninstalledasdetailedinthe
Road-trac Noise Mitigation Plan and individual mitigation agreements.
Ensuredetailsofallnoisebarriersandlow-noiseroadsurfacesareenteredintoRAMM.
SubmitdetailsofacousticstreatmentofPPFstotheEUDTusingthetemplate.
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Dsignatin cnditins
Figure 6 shows which noise standard should be applied to a particular designation.
FIGURe 6 Dsignatin cnditins
Dsignatin
N
ys Us mdl cnditins t gifct t NZS 6806
ys
N
Nw dsignatin?
Altratint dsignatin
rquird?
Spcicdsignatin
cnditins alradxist?
Number oafectedPPFs
< 10 PPFs
10-50 PPFs
> 50 PPFs
Assss mitigatinundr xistingcnditins (tpicallTransit guidlins)
Sk guidanc rmth enirnmnt andUrban Dsign Tam([email protected])
Cnsidr analtratin t thcnditins t applNZS 6806
Spcic
nis cnditinsxist?
N
N Dtrmin an nis mitigatin
rquird using NZS 6806
N
Appl xisting cnditins
(g Transit guidlins)
Cnsidr an altratin t thcnditins t appl NZS 6806
existingcnditins
cmplx, ragmntdand likl t lad t pr
urban dsignutcm?
ys
ys
ys
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Model conditions
It is not possible to prescribe a simplistic perormance standard, such as a noise limit, to the
NZS 6806 process or the results o the process. The BPO is determined by ollowing the correct
process and not by achieving an absolute limit. Recommended designation conditions that
encapsulate the NZS 6806 process are shown below. The conditions provide certainty in the noise
mitigation outcome to be provided, while allowing or development during normal detailed design
processes.
Condition N1
For the purposes o Conditions [N2N12] the ollowing terms will have the ollowing meanings:
a) BPO means the Best Practicable Option.
b) Building-Modifcation Mitigation has the same meaning as in NZS 6806:2010.
c) Habitable Space has the same meaning as in NZS 6806:2010.
d) Noise Assessment
OPTION 1 Build now designation- means the Road-trac Noise Assessment Report [re] submitted with the NOR.
OPTION 2 Route protection designation
- means the Road-trac Noise Assessment Report in accordance with condition [N2].
e) Noise Criteria Categories means the groups o preerence or time-averaged sound levels
established in accordance with NZS 6806:2010 when determining the BPO mitigation option,
ie Category A primary noise criterion, Category B secondary noise criterion and Category C
internal noise criterion.
) NZS 6806:2010 means New Zealand Standard NZS 6806:2010 Acoustics Road-trac
noise New and altered roads.
g) PPFs
OPTION 1 Build now designation- means only the premises and acilities identifed in green, orange or red in the Noise
Assessment.
OPTION 2 Route protection designation
- has the same meaning as in NZS 6806:2010 or the purpose o the preparation o the Noise
Assessment. Once a Noise Assessment has been prepared in accordance with Condition
[N2], PPFs means only the premises and acilities identifed in green, orange or red in the
Noise Assessment.
h) Structural Mitigation has the same meaning as in NZS 6806:2010.
OPTION 1 Build now designation
Condition N2The NZTA shall implement the road-trac noise mitigation measures identifed as the Selected
Options in the Noise Assessment as part o the Project, in order to achieve the Noise Criteria
Categories indicated in the Noise Assessment (Identifed Categories), where practicable, subject
to Conditions [N3N11] below.
OPTION 2 Route protection designation
Condition N2
The NZTA shall appoint a suitably qualifed acoustics specialist, a suitably qualifed planner
approved by the Council, and other designers, to determine the BPO or road-trac noise
mitigation in accordance with NZS 6806:2010. No later than 6 months prior to construction
starting, the NZTA shall submit to the Council a Road-trac Noise Assessment Report (Noise
Assessment) detailing the assessment process, Selected Options or noise mitigation, and the
Noise Criteria Categories or all PPFs (Identifed Categories). The NZTA shall implement the
Selected Options or noise mitigation identifed in the Noise Assessment as part o the Project, in
order to achieve the Identifed Categories where practicable, subject to Conditions [N3N11] below.
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Condition N3
The detailed design o the Structural Mitigation measures in the Selected Options (the Detailed
Mitigation Options) shall be undertaken by a suitably qualifed acoustics specialist prior to
construction o the Project, and, subject to Condition [N4], shall include, as a minimum, the
ollowing:
a) Noise barriers with the location, length and height in general accordance with the Noise
Assessment; and
b) Low-noise road suraces in general accordance with the Noise Assessment.
Condition N4
Where the design o the Detailed Mitigation Options identifes that it is not practicable to
implement a particular Structural Mitigation measure in the location or o the length or height
included in the Selected Options either:
a) i the design o the Structural Mitigation measure could be changed and would still achieve the
same Identifed Category or Category B at all relevant PPFs, and a suitably qualifed plannerapproved by the Council certifes to the Council that the changed Structural Mitigation would
be consistent with adopting the BPO in accordance with NZS 6806:2010, the Detailed
Mitigation Options may include the changed mitigation measure; or
b) i changed design o the Structural Mitigation measure would change the Noise Criteria
Category at any relevant PPF rom Category A or B to Category C, but the Council confrms that
the changed Structural Mitigation would be consistent with adopting BPO in accordance with
NZS 6806:2010, the Detailed Mitigation Options may include the changed mitigation measure.
Condition N5
The Detailed Mitigation Options shall be implemented prior to completion o construction o the
Project, with the exception o any low-noise road suraces, which shall be implemented within
12 months o completion o construction.
Condition N6
Prior to construction o the Project, a suitably qualifed acoustics specialist shall identiy those PPFs
which ollowing implementation o all the Structural Mitigation included in the Detailed Mitigation
Options are not in Noise Criteria Categories A or B and where Building-Modifcation Mitigation
may be required to achieve 40 dB LAeq(24h)
inside habitable spaces (Category C Buildings).
Condition N7
a) Prior to commencement o construction o the Project in the vicinity o a Category C Building,
the NZTA shall write to the owner o each Category C Building seeking access to such building
or the purpose o measuring internal noise levels and assessing the existing building envelope
in relation to noise reduction perormance.
b) I the owner(s) o the Category C Building approves the NZTAs access to the property within
12 months o the date o the NZTAs letter (sent pursuant to Condition [N7(a)]), then no more
than 12 months prior to commencement o construction o the Project, the NZTA shall instruct
a suitably qualifed acoustics specialist to visit the building to measure internal noise levels and
assess the existing building envelope in relation to noise reduction perormance.
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A owchart illustrating application o conditions N6 to N11 is provided in the NZTAs State highwayguide to acoustics treatment o buildings.
NZ Transprt Agnc | Road-trac noise assessment | SP/M/023 | October 2011 / version 1.0 21
Condition N8
Where a Category C Building is identifed, the NZTA shall be deemed to have complied with
Condition [N7] above where:
a) The NZTA (through its acoustics specialist) has visited the building; or
b) The owner o the Category C Building approved the NZTAs access, but the NZTA could not
gain entry or some reason (such as entry denied by a tenant); or
c) The owner o the Category C Building did not approve the NZTAs access to the property within
the time period set out in Condition [N7(b)] (including where the owner(s) did not respond to
the NZTAs letter (sent pursuant to Condition [N7(a)] within that period)); or
d) The owner o the Category C Building cannot, ater reasonable enquiry, be ound prior to
completion o construction o the Project.
I any o (b) to (d) above apply to a particular Category C Building, the NZTA shall not be required
to implement any Building-Modifcation Mitigation at that Category C Building.
Condition N9
Subject to Condition [N8], within six months o the assessment required under Condition [N7(b)],
the NZTA shall give written notice to the owner o each Category C Building:
a) Advising o the options available or Building-Modifcation Mitigation to the building; and
b) Advising that the owner has three months within which to decide whether to accept Building-
Modifcation Mitigation or the building, and i the NZTA has advised the owner that more than
one option or Building-Modifcation Mitigation is available, to advise which o those options
the owner preers.
Condition N10
Once an agreement on Building-Modifcation Mitigation is reached between the NZTA and theowner o an aected building, the mitigation shall be implemented (including the NZTA obtaining
any third party authorisations required to implement the mitigation) in a reasonable and practical
timerame agreed between the NZTA and the owner.
Condition N11
Subject to Condition [N8], where Building-Modifcation Mitigation is required, the NZTA shall be
deemed to have complied with Condition [N10] above where:
a) The NZTA has completed Building-Modifcation Mitigation to the Category C Building; or
b) The owner o the Category C Building did not accept the NZTAs oer to implement Building-
Modifcation Mitigation prior to the expiry o the timerame stated in Condition [N9(b)] above
(including where the owner did not respond to the NZTA within that period); orc) The owner o the Category C Building cannot, ater reasonable enquiry, be ound prior to
completion o construction o the Project.
Condition N12
The NZTA shall manage and maintain the Detailed Mitigation Options to ensure that, to the extent
practicable, those mitigation works retain their noise reduction perormance or at least 10 years
ater the opening o the Project to the public.
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This newsletter is printed on environmentally-responsible paper manuactured using FSC-certifed,
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our cntact dtails
Furthr inrmatinNZTA Transport Noise website,www.acoustics.nzta.govt.nz
Standards New Zealand (publishers o NZS 6806),www.standards.co.nz
Rob Hannaby
Principal Environmental Specialist
Highways and Network Operations
Proessional Services
Telephone: 09 928 8761
Mobile: 021 242 0853
http://www.acoustics.nzta.govt.nz/http://www.standards.co.nz/http://www.standards.co.nz/http://www.acoustics.nzta.govt.nz/