C9 2 Porters Ave SSCNVMP

C9 2 Porters Ave SSCNVMP

C9.1 Introduction

This Site Specific Construction Noise and Vibration Management Plan (SSCNVMP) is for the commercial building located at 2 Porters Ave. A SSCNVMP is required because construction is predicted to exceed the 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 C9 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 2 Porters Ave.

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

C9.2 Engagement

Mt Eden Enabling Works (for information)

In the absence of contact details, Link Alliance representatives Duncan Whyte, Hilary Konigkramer and Richard Deane knocked on the door on 10 September 2019. Unfortunately, there was no answer. A general information pack with contact details was left. No response has been received to date to undertake further consultation.

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 concrete building has small areas of glazing, a roller door and a shallow pitched steel roof. The estimated sound level difference across the façade with the windows and doors closed is 20 –30 decibels. The predicted construction noise effects from Table 12.1 in Section 12.1 are predicted to result in short-term 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. Preliminary large excavator mounted rock breaker vibration level predictions (Section 6.2 of the Enabling Works CNV DWP) identify that there is also potential to 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 pre construction building condition survey in accordance with CRL designation condition 46 will ensure any damage is identified for remediation.

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Consultation engagement has not been successful to date. Prior communication of timeframes for works with the potential to exceed the relevant noise limits will be provided where practicable (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).

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C9.3 Review Process

If the property representatives 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 34 Mt Eden Main Works CNV DWP –Appendix C SSCNVMPs