C27
5 Water Street SSCNMP C27.1 Introduction This Site-Specific Construction Noise Management Plan (SSCNMP) is for the commercial building located at 5 Water Street. A SSCNMP is required because construction is predicted to exceed the Project Noise Standards in CRL designation condition 31. This SSCNMP has been prepared in accordance with CRL designation condition 37 and is Appendix C27 of the Mt Eden Main Works Construction Noise and Vibration Delivery Work Plan (CNV DWP). It is a supplementary document that builds on the Project CNV DWP, and therefore directly references relevant sections of the DWP to avoid repetition. The objective of this SSCNMP is to detail the best practicable option(s) (BPO) to avoid, remedy or mitigate the identified adverse effects from noise exceedances at 5 Water Street. This draft SSCNMP has been prepared by Marshall Day Acoustics and forms part of the Construction Environmental Management Plan (CEMP) for the Project. It builds on the SSCNMP previously prepared and implemented for the Normanby Rd Early Works.
C27.2 Engagement Normanby Rd Early Works (for information) Link Alliance representatives Sonya Leahy, Hilary Konigkramer and Craig Fitzgerald (Marshall Day Acoustics) met with Rhys Williams (I Measure U) on 10 October 2019. The matters discussed included: •
An overview of the Normanby Road early works.
•
General work programme.
•
Overview of the CNV DWP and this SSCNMP, communications triggers and protocol.
The site is used for commercial purposes, with the large open plan office space for I Measure U in a converted warehouse above basement car parking. Mr Williams key concern was vibration due to camera equipment used on-site. It was explained that the adjacent low-rise buildings would be dismantled to minimise vibration, but the concrete foundations may need to be broken up which may be perceptible. The CNV DWP has specific measures to minimise vibration. Of interest to Mr Williams was that this activity would be short in duration and advanced communication would be provided with timing of breaking works. The south and east façades are predicted to be exposed noise levels exceeding the 75 dB LAeq noise limit from the demolition of 11 Water Street in February 2020, and the sewer trenching works adjacent to 5 Water Street in May 2020. Activity specific mitigation and management measures are included in Section 9 of the CNV DWP and not repeated here (e.g. Section 9.4 general mitigation measures). The building at 5 Water Street is a double level industrial building with blockwork façade, small sealed windows, but steel pitched roof with no internal ceiling. The estimated sound level difference across the façade with the windows and doors closed is 20 – 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 isolated disturbance during adjacent sewer connection works. 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 C5 enabling works. Page 81
| Mt Eden Main Works CNV DWP – Appendix C SSCNVMPs
