C13
6 Porters Ave + 3 Ngahuru St (Eden North Apartments) SSCNVMP C13.1 Introduction This Site Specific Construction Noise and Vibration Management Plan (SSCNVMP) is for the residential building located at 6 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 C13 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 6 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.
C13.2 Engagement Mt Eden Enabling Works (for information) Link Alliance representatives Sonya Leahy, Hilary Konigkramer, Aidan Kirby-McLeod, Phil Young and Craig Fitzgerald (Marshall Day Acoustics) met with building representative Diane Gribben (Body Corporate Chair of North Eden Apartments) and Daniel (Building manager) on 18 September 2019. The matters discussed included: •
An overview of the project
•
General programme, demolition, blasting, rock breaking and utilities relocation activities
•
Overview of the CNV DWP and this SSCNVMP, communications triggers and protocol and for monitoring and pre-construction building condition surveys
The modern multi-level terraced apartment building features basement car parking beneath 48 apartments across two buildings, some with balconies on the south side overlooking the rail corridor and worksite. There are approximately 2-3 families with young children. 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 75 – 80 dB LAeq on the south façade and 80 – 90 dB LAeq on the west façade. While this significantly exceeds the 75 dB LAeq noise limit on the west façade, 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 modern concrete building has well sealed openable glazing. 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 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.
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| Mt Eden Main Works CNV DWP – Appendix C SSCNVMPs
