C11
4 Porters Ave SSCNVMP C11.1 Introduction This Site Specific Construction Noise and Vibration Management Plan (SSCNVMP) is for the commercial building located at 4 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 C11 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 4 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.
C11.2 Engagement Mt Eden Enabling Works (for information) Link Alliance representatives Duncan Whyte, Hilary Konigkramer and Richard Deane met with Minka Johnson IP (ADFW) on 10 September 2019. The matters discussed included: •
An overview of the project
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General programme of works, rock breaking activities
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Overview of the CNV DWP and this SSCNVMP, communications triggers and protocol
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Building layout and identification of any noise sensitive spaces/activities
Whilst ADFW own the building, they share the ground floor and 1st Level with 3 other businesses (jade sculptor, metal worker, fashion designer respectively). ADFW themselves fabricate models for architecture and design. 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 93 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 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. 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 Page 38
| Mt Eden Main Works CNV DWP – Appendix C SSCNVMPs
