C8 83 Mt Eden Road SSCNMP

C8

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83 Mt Eden Road SSCNMP

C8.1 Introduction

This Site Specific Construction Noise Management Plan (SSCNMP) is for the commercial building located at 83 Mt Eden Road. It is reproduced from the Mt Eden Enabling Works CNV DWP, where construction was predicted to exceed the standards in CRL designation conditions 31. A SSCNMP is not required for the Mt Eden Station Main Works. It is included for information to ensure consistency across project stages. This SSCNMP has been prepared in accordance with CRL designation condition 37 and is Appendix C8 of the Mt Eden Main Works Construction Noise and Vibration Delivery Work Plan (CNV DWP). It is a supplementary document that builds on the CNV DWP, and therefore directly references relevant sections of the CNV DWP to avoid repetition. The objective of this SSCNMP is to detail the best practicable option(s) (BPO) to avoid, remedy or mitigate the identified adverse effects from noise exceedances at 83 Mt Eden Road.

This SSCNMP has been prepared for the Link Alliance and forms part of the Construction Environmental Management Plan (CEMP) for the Mt Eden Station Main Works.

C8.2 Engagement

Mt Eden Enabling Works (for information)

Link Alliance representatives Jarrod Snowsill and Craig Fitzgerald met with Steve Bohling (MPM) on 29 August 2019. The matters discussed included:

An overview of the project General project programme, demolition and rock breaking/blasting activities

Overview of the CNV DWP and this SSCNMP, communications triggers and protocol

Building layout and identification of any noise sensitive spaces MPM offices occupy the middle level of the building, facing west over the works. The top floor is unoccupied (for lease) and the basement level was unoccupied during the visit, but is understood to be occasionally occupied by Direct Control. MPM were previously opposite the C6 site in Shaddock Street. There main concern was rock breaking and blasting vibration effects on their building and stock of cameras. It was explained that they would feel vibration, however, it is currently not predicted to be at a level that would require pre-construction building condition survey or effect stored cameras. However, triggers in the CNV DWP and monitoring during these events would inform the need for such steps. Figure B.5 in Appendix B of the Mt Eden Enabling Works CNV DWP shows that the south façade is predicted to be exposed to noise levels between 75 –80 dB L Aeq during the closest rock breaking activities, exceeding the 75 dB L Aeq noise limit. Activity specific mitigation and management measures are included in Section 9 of the CNV DWP and not repeated here (e.g. Section 9.7 concrete and rock breaking). The concrete building has operable glazing and a shallow pitched steel roof. The estimated sound level difference across the façade with the windows and doors closed is 25 –30 decibels. The predicted construction noise effects from Table 12-1 in Section 12.1 are predicted to be typically acceptable, but with the potential for some disturbance for nearby rock breaking. Physical receiver mitigation, such as temporary relocation of affected

Mt Eden Main Works CNV DWP –Appendix C SSCNVMPs

receivers, alternative ventilation and façade sound insulation improvements, have been considered, but are not required as part of the BPO for the C3 enabling works. Mr Bohling agreed that prior communication of timeframes for works with the potential to exceed the relevant noise limits was an acceptable means of managing effects. No further activity specific consultation is necessary over and above regular communication (Section 10). Vibration is predicted to comply with the relevant standards (Section 6.2 of the Enabling Works CNV DWP). Nonetheless, it is noted that a pre construction building condition survey has been undertaken.

Mt Eden Main Works

None required for the Mt Eden Station Main Works. However, noting Mr Bohling previously agreed that prior communication of timeframes for works with the potential to exceed the relevant noise limits was an acceptable means of managing effects. No further activity specific consultation is necessary over and above regular communication (Section 10).

C8.3 Review Process

If Mr Bohling requests consultation in the future, this SSCNMP will be updated in accordance with CRL designation condition 37.5, with consideration given to the following:

The extent to which noise may exceed the designation noise standards

The timing and duration of any exceedance

The type of activity causing any exceedance

A summary of the communication and consultation with the receiver

The methods and measures to mitigate noise effects

A statement of why they reflect best practicable option Communications records are contained in the communication and consultation plan (CCP). This SSCNMP will be updated to summarise engagement and any agreed site-specific measures.

Page 31 Mt Eden Main Works CNV DWP –Appendix C SSCNVMPs