C5
24 Mt Eden Road (House of Knives) SSCNVMP C5.1 Introduction This Site Specific Construction Noise and Vibration Management Plan (SSCNVMP) is for the commercial building located at 24 Mt Eden Road. A SSCNVMP is required because construction is predicted to exceed the noise and vibration standards in CRL designation condition 31 and 33. This SSCNVMP has been prepared in accordance with CRL designation condition 37 and 38 and is Appendix C5 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 exceedances at 24 Mt Eden Road. This SSCNMP 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 SSCNMP previously prepared and implemented for the Mt Eden Enabling Works.
C5.2 Engagement Mt Eden Enabling Works (for information) Link Alliance representatives Sonya Leahy, Thibaut L'Hopital, Aidan Kirkby-McLeod, Duncan Whyte and Craig Fitzgerald (Marshall Day Acoustics) met with John Fryer on 11 September 2019. The matters discussed included: •
An overview of the project
•
General programme, demolition, piling and rock breaking/blasting activities
•
Overview of the CNV DWP and this SSCNMP, communications triggers and protocol
The site is used for commercial purposes, with the House of Knives cookware shop fronting Mt Eden Road. Shop opening hours are generally 9.30am – 5pm, Monday to Saturday. Mr Fryer voiced concerns about vibration associated with previous C6 piling works. From Mr Fryer’s description, the source of the vibration was from vibrated pile casings installed on the adjacent site and from vertically dropping an auger from height onto the ground. Mr Fryer was advised that vibro piling was not part of the current piling methodology for the new Mt Eden Road bridge and that dropping an auger bit was most likely avoidable with good practice. Figure B.4 in Appendix B of the Mt Eden Enabling Works CNV DWP shows that the south and west façades are predicted to be exposed to noise levels between 75 – 80 dB LAeq during the closest bored piling activities, exceeding the 75 dB LAeq noise limit. Activity specific mitigation and management measures are included in Section 9 of the CNV DWP and not repeated here (e.g. Section 9.8 piling). The buildings at 24 Mt Eden Road are primarily single story with either weatherboard or brick façades, operable glazing and a steel pitched roof. The estimated sound level difference across the façade with the windows and doors closed is 25 decibels. The predicted construction noise effects from Table 12-1 in Section 12.1 are predicted to be typically acceptable, but with the potential for some disturbance during installation of the closest bridge piling and demolition works. Physical receiver mitigation, such as temporary relocation of affected receivers, alternative ventilation and façade sound insulation Page 23
| Mt Eden Main Works CNV DWP – Appendix C SSCNVMPs
