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 LAeq on the west façade. While this significantly exceeds the 75 dB LAeq 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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| Mt Eden Main Works CNV DWP – Appendix C SSCNVMPs
