C17 5a Fenton Street SSCNVMP

C17 5a Fenton Street SSCNVMP

Page 56 C17.1 Introduction

This Site Specific Construction Noise and Vibration Management Plan (SSCNVMP) is for the commercial building located at 5a Fenton Street. A SSCNVMP is required because construction is predicted to exceed the Project Standards in CRL designation conditions 31 and 33.

This SSCNVMP has been prepared in accordance with CRL designation condition 37 and 38 and is Appendix C17 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 SSCNVMP is to detail the best practicable option(s) (BPO) to avoid, remedy or mitigate the identified adverse effects from noise and vibration exceedances at 5a Fenton Street.

This SSCNVMP has been prepared for the Link Alliance and forms part of the Construction Environmental Management Plan (CEMP) for the Mt Eden Main Works. It builds on the SSCNVMP previously prepared and implemented for the Mt Eden Enabling Works.

C17.2 Engagement

Mt Eden Enabling Works (for information)

Link Alliance representatives Duncan Whyte, Hilary Konigkramer and Richard Deane met with Danny Bracks (Office Relocations) on 10 September 2019. The matters discussed included:

An overview of the project

General programme of works, rock breaking activities

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

Building layout and identification of any noise sensitive spaces/activities Office Relocations offices occupy the ground level of the building, facing north to the works. Rock breaking activities are required in close proximity to this building for short periods. Figures B.7 and B.8 in Appendix B of the Mt Eden Enabling Works CNV DWP predict rock breaking noise levels of up to 80 –90 dB L Aeq on the west façade. While this significantly exceeds the 75 dB L Aeq noise limit, levels will reduce rapidly as works migrate away. Other utilities works will generally be compliant. 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 building is a masonry façade, openable windows and a shallow pitched steel roof. The estimated sound level difference across the façade with the doors closed is 25 –30 decibels. The predicted construction noise effects from Table 12.1 in Section 12.1 are predicted to result in short-term noise disturbance. Physical receiver mitigation, such as temporary relocation of affected 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. Danny Bracks raised concerns over levels of vibration resulting in damage in the companies glassware and crockery. Preliminary large excavator mounted rock breaker vibration level predictions (Section 6.2 of the Enabling Works CNV DWP) identify that there is potential to

Mt Eden Main Works CNV DWP –Appendix C SSCNVMPs

exceed the commercial cosmetic building damage thresholds and will be clearly perceptible. Cosmetic building damage effects are deemed ‘minor damage’ in the DIN Standard (Section 5.2), such as cracking in paint or plasterwork, and can generally be easily repaired. A preconstruction building condition survey in accordance with CRL designation condition 46 will ensure any damage is identified for remediation. Danny Bracks 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).

Mt Eden Main Works

Link Alliance representatives XXX met with building representative XXX on XXX date. The matters discussed included:

An overview of the next project phases

General programme, rock removal, excavation, piling, and utilities relocation activities

General review of CNV DWP and this SSCNVMP, communications triggers and monitoring CNV DWP Section 7 identifies summarise the potential scale of noise and/or vibration exceedances using the modelling outputs in insert hyperlink to the GIS maps here. The relevant stages are summarised below. Activity specific mitigation and management measures are included in Section 9 of the CNV DWP, and referenced in brackets, rather than repeated.

Noise

Retaining walls (refer piling in Section 9.8)

Excavation (refer concrete and rock breaking in Section 9.7) Utilities and drainage (refer concrete cutting and breaking in Sections 9.6 and 9.7)

Fenton and Porters Ave (refer rock breaking and piling in Sections 9.7 and 9.8) The predicted construction noise effects from Table 12.1 in Section 12.1 are predicted to result in XXX noise effects. Physical receiver mitigation, such as temporary relocation of affected receivers, alternative ventilation and façade sound insulation improvements, have been considered, but are not required as part of the BPO for the Mt Eden Station Main Works.

Vibration

Utilities and drainage (refer breaking, piling and compaction in Sections 9.7, 9.8 and 9.10) The above activities are predicted to have the potential to exceed the commercial cosmetic building damage thresholds. Cosmetic building damage effects are deemed ‘minor damage’ in the DIN Standard (Section 5.2), such as cracking in paint or plasterwork, and can generally be easily repaired. A pre construction building condition survey in accordance with CRL designation condition 46 will ensure any damage is identified for remediation. XXX agreed that prior communication of timeframes for works with the potential to exceed the relevant noise and vibration limits was an acceptable means of managing effects. No further activity specific consultation is necessary over and above regular communication (Section 10).

Page 57 Mt Eden Main Works CNV DWP –Appendix C SSCNVMPs

C17.3 Review Process

If Danny Bracks request consultation in the future, this SSCNVMP will be updated in accordance with CRL designation conditions 37.5 and 38.5, with consideration given to the following:

The extent to which noise may exceed the designation 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 effects

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

Page 58 Mt Eden Main Works CNV DWP –Appendix C SSCNVMPs