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  • PRM 220kV ConnectionTranspower10 May 2013

    Paraparaumu Substation220kV ConnectionEnvironmental Noise Modelling for SSR

  • AECOM PRM 220kV ConnectionParaparaumu Substation 220kV Connection

    10 May 2013

    Paraparaumu Substation 220kV ConnectionEnvironmental Noise Modelling for SSR

    Prepared for

    Transpower

    Prepared byAECOM New Zealand LimitedLevel 10, 135 Victoria Street, Te Aro, Wellington 6011, PO Box 27277, Wellington 6141, New ZealandT +64 4 382 2999 F +64 4 382 2998 www.aecom.com

    10 May 2013

    60285897

    AECOM in Australia and New Zealand is certified to the latest version of ISO9001 and ISO14001.

    AECOM New Zealand Limited (AECOM). All rights reserved.

    AECOM has prepared this document for the sole use of the Client and for a specific purpose, each as expressly stated in the document. No otherparty should rely on this document without the prior written consent of AECOM. AECOM undertakes no duty, nor accepts any responsibility, to anythird party who may rely upon or use this document. This document has been prepared based on the Clients description of its requirements andAECOMs experience, having regard to assumptions that AECOM can reasonably be expected to make in accordance with sound professionalprinciples. AECOM may also have relied upon information provided by the Client and other third parties to prepare this document, some of whichmay not have been verified. Subject to the above conditions, this document may be transmitted, reproduced or disseminated only in its entirety.

  • AECOM PRM 220kV ConnectionParaparaumu Substation 220kV Connection

    10 May 2013

    Quality InformationDocument Paraparaumu Substation 220kV Connection

    Ref 60285897

    Date 10 May 2013

    Prepared by Phil Blakemore

    Reviewed by Claire Drewery

    Revision History

    Revision RevisionDate Details

    Authorised

    Name/Position Signature

    0 3-Apr-2013 Draft for Client Review Claire DreweryPrincipal AcousticConsultant

    1 17-Apr-2013 Revised Draft for ClientReview

    Claire DreweryPrincipal AcousticConsultant

    2 6-May-2013 Final 60% load assessment Claire DreweryPrincipal AcousticConsultant

    34 8-May2013 Revised final 60% loadassessment

    Claire DreweryPrincipal AcousticConsultant

    4 10-May-2013 Minor revision for NORsubmission, 60% load

    Joanne OliverPrincipal ElectricalEngineer/ ProjectManager

  • AECOM PRM 220kV ConnectionParaparaumu Substation 220kV Connection

    10 May 2013

    Table of Contents1.0 Introduction 12.0 Existing Site Description 13.0 Environmental Noise Criteria 24.0 Measurement Methodology 25.0 Existing Substation Results 3

    5.1 Ambient Noise 35.2 Substation Noise 35.3 Transformer Loads 45.4 Discussion 4

    6.0 Noise Levels 57.0 Fire Wall Data 58.0 Assessment 59.0 Mitigation 710.0 Conclusion 10

    Appendix AAcoustic Nomenclature A

    Appendix BMeasured Noise Spectra B

    Appendix CBoundary Noise Map B

  • AECOM PRM 220kV ConnectionParaparaumu Substation 220kV Connection

    10 May 2013

    1

    1.0 IntroductionAECOM was engaged by Transpower to undertake environmental noise measurements to determine theprevailing noise emissions from Transpowers Paraparaumu Substation. An assessment of environmental noisefrom the proposed new substation which is to be located directly adjacent to the existing Substation was also partof this assessment.

    Noise was measured at the existing substation by AECOM personnel between the 20th and 21st December 2012.To assist in the SSR, an acoustic noise model has been developed to determine likely incident noise levels at theadjacent residential boundaries following completion of the substation. This report documents the findings of thenoise measurements and assessment.

    Definitions of the acoustic nomenclature used in this report are presented in Appendix A.

    2.0 Existing Site DescriptionThe existing Paraparaumu Substation is located on Valley Road, Paraparaumu. There are a number of residentialproperties in the vicinity of the substation with the most exposed properties determined as being 125 RuapehuStreet to the west of the Substation, 137A Ruapehu Street; south and 70A Valley Road to the east.

    The main noise sources associated with the substation are the substations two transformers. Both transformersinclude cooling fans that operate intermittently as required, to control the transformer oil temperatures.

    Figure 1 presents an aerial photograph of the substation and surrounding area.

    Figure 1 Site Layout (Aerial Photo Source: Google Maps)

    Substation

  • AECOM PRM 220kV ConnectionParaparaumu Substation 220kV Connection

    10 May 2013

    2

    3.0 Environmental Noise CriteriaAs a designated substation it is understood that the existing Valley Road Substation is exempt from the ordinarynoise rules of the District Plan. Further to this, there are no noise conditions associated with the designation forthe substation and therefore there are no set limits with which noise from the substation must comply. However,Transpower still has a duty to ensure that noise from the substation complies with the requirements of theResource Management Act 1991 (RMA), and in particular, Sections 16 and 17, which require the best practicableoption to be taken to avoid or mitigate unreasonable noise.

    The level of noise that may be considered reasonable can be dependent on a number of factors in addition tothe absolute noise level itself, including:

    - The nature or character of the noise;

    - The sensitivity of the receiving environment to the effects of the noise;

    - The current state of technical knowledge and the likelihood that noise mitigation measures could beimplemented successfully.

    - The financial implications of implementing noise mitigation measures;

    - Other effects on the environment that would occur as a result of implementing noise mitigation measures (forexample, visual effects).

    It is beyond the scope of this report to define the level of noise that would be reasonable, but to provide someguidance, consideration has been given to the ordinary noise rules prescribed for the underlying residential zoneby the Kapiti Coast District Plan.

    It is understood that the new substation will be required to meet the environmental noise criteria stipulated in theKapiti Coast District Plan (KCDP). The KCDP criteria are provided below.

    D.1 - I Non-Residential Activities states the following:

    All non-residential activities, other than transportation activities or construction, maintenance and demolition work(except in the case of temporary military training activities for which specific rules apply) shall be located,designed and carried out to ensure that the following noise levels are not exceeded at or within any residentialboundary:

    7am to 10pm - 50 dBA L10

    10pm to 7am - 45 dBA L10

    During all night time hours (10pm to 7am) no noise event shall exceed Lmax 75dBA

    The KCDP Plan goes on to state the following requirements:

    Noise shall be measured in accordance with NZS 6801:1991 Measurement of Sound and assessed inaccordance with NZS 6802:1991 Assessment of Environmental Sound

    4.0 Measurement MethodologyThe noise measurements were performed in accordance with NZS 6801:1991, from 23:30 on 20th December to00:30 on 21 December 2012. The weather during the measurement was clear with little wind.

    A Rion NL-32 Type 1 Sound Level Meter (Serial No. 001616083) was used to perform the measurements. Thecalibration of the sound level meter was checked before and after the measurements using a portable SoundLevel Calibrator, and was found to be reading correctly on all occasions.

    Noise from the substation was measured within the substation yard at a distance of 2m from the transformers andat the boundary of three different receptors to the east (70A Valley Road), south (137A Ruapehu Street) and west(125 Ruapehu Street) of the Substation. These receptors are located at the residences potentially most-affectedby noise from the substation.

    An ambient noise measurement (to determine the residual noise level) was performed approximately 400m north-west of the substation along Kaitawa Crescent for a period of 10 minutes. At this location, noise from the

  • AECOM PRM 220kV ConnectionParaparaumu Substation 220kV Connection

    10 May 2013

    3

    substation was not audible. The ambient noise levels were considered to be representative of the ambient noiselevels in the vicinity of the substation, excluding the noise from the substation itself.

    The location of each measurement position is presented in Figure 2.

    Figure 2 Measurement Locations (Aerial Photo Source: Google Maps)

    5.0 Existing Substation Results

    5.1 Ambient NoiseThe ambient noise levels to north-west of the substation along Kaitawa Crescent were measured to be 31.9 dBLAeq (10min). The ambient noise environment was dominated by distant traffic noise. Ambient daytime noise levelswere not undertaken but are not anticipated to differ significantly from increased activity on minor roads andvehicle movements along the State Highway, which is approximately 600m from the substation.

    5.2 Substation NoiseThe measured noise levels within the substation switchyard and at the boundary of the assessment locationswere dominated by noise from the substation. Ambient noise levels during the measurement period were morethan 20dB below the prevailing background noise levels and no adjustment for residual noise influence istherefore required.

    When assessed using the NZS 6802:2008 simplified test method for tonality, noise from the substation when thefans are not operating is defined as tonal for all locations. In accordance with NZS 6802:2008, a tonalityadj