C69 45 53 Boston Rd (J.A. Russell) SSCNMP

C69

Page 169

45 –53 Boston Rd (J.A. Russell) SSCNMP

C69.1 Introduction

This Site Specific Construction Noise Management Plan (SSCNMP) is for 45 –53 Boston Rd. A SSCNMP is required because construction is predicted to exceed the standards in CRL designation conditions 31. This SSCNMP has been prepared in accordance with CRL designation condition 37 and is Appendix C69 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 SSCNMP is to detail the best practicable option(s) (BPO) to avoid, remedy or mitigate the identified adverse effects from noise exceedances at 45 –53 Boston Rd.

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 Stormwater Realignment Works.

C69.2 Engagement

Mt Eden C6 Stormwater Realignment Works

Graeme Inglis (MBJV) and Craig Fitzgerald (Marshall Day Acoustics) met with Warren Goodall (J. A. Russell Branch Manager) and their architect Malcolm Ewart (MOAI) on 16 April 2018. The matters discussed in both meetings included an overview of the project, general project programme, sheet piling, overview of the CNV DWP and this SSCNMP, communications triggers and protocol, building layout and identification of noise and vibration sensitive spaces. The eastern most building on this site is approximately 4-5m from the closest edge of the GPT2 site and was the focus of the noise and vibration effects. The modern masonry building was built in approximately 2004. The street level basement includes a pump and generator room beyond which is car parking. The first-floor level includes a showroom on the street façade, behind which is office and retail areas. The second level is open plan and enclosed office spaces. Potential vibration from sheet piling activities was the primary focus of the discussions. The vibration levels are predicted to comply with the cosmetic building damage thresholds for a commercial building. However, occupants would likely find the noise and vibration levels uncomfortable and potentially disconcerting. Mr Goodall advised that the buildings were fully occupied during weekdays, but only retail areas in other buildings were occupied on Saturdays. Therefore, Mr Inglis and Mr Goodall considered that timing the sheet piling activities on Saturdays would avoid noise and vibration related amenity effects. Furthermore, and despite predicted compliance with the cosmetic building damage vibration limits, a pre construction building condition survey would be offered to provide confidence that any attributable damage would be captured and enable it to be remedied by MBJV accordingly. Lastly, vibration monitoring would be undertaken to verify the predictions and enable the implementation of adaptive management measures if required. Mark Merrie (MBJV), Jenny Chu (CRLL), Aidan Kirby-McLeod (CRLL) and Craig Fitzgerald (Marshall Day Acoustics), met with Shane Smales (J.A. Russell), Adam Parker (J.A. Russell) and

Mt Eden Main Works CNV DWP –Appendix C SSCNVMPs

Rory Bishop (Alta) on 26 June 2018 to discuss their vibration complaint. The complaint related to GPT1 sheet piling works and their concerns about similar effects from the future GPT2 sheet piling works. In summary:

Prior to the meeting commencing, Mr Parker identified the server room in the north west corner of the level 1 office area (a floor plan was provided subsequently). The server is in metal racks resting directly on a raised floor above the level 1 concrete floor. A UPS and telephone system is also in the server room on rubber mounts.

The meeting commenced with Mr Smales and Mr Parker providing a summary of their complaint, which related to vibration amenity effects for occupants during sheet piling works and concerns about the vibration effects on their server.

Mark Merrie provided a summary of the sheet piling works. It was noted that unforeseen issues extended sheet piling from 1-2 days to more than 10 days. As a result, the works were undertaken when the J.A. Russell office was occupied.

Craig Fitzgerald provided a summary of sheet piling vibration monitoring, showing that the cosmetic building damage vibration limits were complied with, but acknowledged that the vibration levels of 2 –3 mm/s PPV would be uncomfortable and potentially disconcerting. The GPT2 sheet piling works would be closer and the vibration levels higher. Cosmetic building damage vibration limits are predicted to be complied with, however, a pre construction building condition survey has been undertaken regardless. It is highly recommended that the works be undertaken on weekends when the building is largely unoccupied.

Vibration sensitivity for IBM servers is provided in a separate MDA memo 0016. Construction vibration will be monitored on the server floor (in addition to the building foundations and top floor) during further vibration monitoring of sheet piling to ensure compliance. This will occur during GPT1 sheet pile extraction. MBJV to provide 1 week notice to JA Russell for GPT1 sheet pile extraction.

Review noise and vibration monitoring results from GPT1 and determine the construction methodology response required for GPT2. The methodology planned test pile for GPT 2 will be pre-drilled and then the sheet pile will be vibrated in using the proposed plant currently on site.

Noise and vibration monitoring will also be undertaken during a test pile for GPT 2 at a location that is closest to the façade of JA Russell (worst case scenario).

The group will review the N&V monitoring results and determine the construction methodology response required.

At this stage MBJV targets to finish GPT 1 by end July 2018 (weather dependent), then demobilise and wait till Oct 2018 to recommence with GPT 2 and 3 such that weather effects on productivity can be mitigated.

Aidan will discuss with Council regarding working on Sunday (conditions do not allow piling works on Sunday) The building at 47 –49 Boston Road is a commercial building occupied by offices and a retail shop. The building is of masonry construction and sealed glazing. The estimated sound level difference across the façade with the windows and doors closed is 30 decibels. On this basis,

16 MDA memo Mm 003 20170737 PJT (J.A. Russell Data Centre Construction Vibration, dated 4 July 2017 Page 170 Mt Eden Main Works CNV DWP –Appendix C SSCNVMPs

Page 171 the predicted construction noise effects can be determined from Table 7 in Section 8.1.2 of the Mt Eden Stormwater Realignment CNV DWP. Mr Goodall indicated that prior communication of timeframes for works with the potential to exceed the relevant noise limits was an acceptable means of managing effects. Apart from the matters addressed above, no further activity specific consultation is necessary over and above regular communication. This is to be satisfied through monthly email updates, supplemented by activity specific emails in advance of identified works.

Mt Eden Main Works

Link Alliance representatives XXX met with building representative XXX on XXX date. 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 SSCNMP, communications triggers and monitoring The two to three-level commercial and industrial buildings feature a mixture of masonry and lightweight façades and sealed windows. Some office areas front Boston Rd, the rail corridor and worksite.

CNV DWP Section 7 identifies summarise the potential scale of noise and/or vibration exceedances using the modelling outputs in insert hyperlink to the GIS maps here. The relevant stages are summarised below. Activity specific mitigation and management measures are included in Section 9 of the CNV DWP, and referenced in brackets, rather than repeated.

Retaining walls (refer piling in Section 9.8)

Normanby Rd (refer piling in Section 9.8) The estimated sound level difference across the façade with the windows and doors closed is 30 decibels. The predicted construction noise effects from Table 12.1 in Section 12.1 are predicted to result in XXX noise effects. 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 Mt Eden Station Main Works.

XXX agreed that prior communication of timeframes for works with the potential to exceed the relevant noise limits was an acceptable means of managing effects. No further activity specific consultation is necessary over and above regular communication (Section 10).

C69.3 Review Process

If XXX or affected site representatives request consultation in the future, this SSCNMP will be updated in accordance with CRL designation conditions 37.5, with consideration given to the following:

The extent to which noise may exceed the designation standards

The timing and duration of any exceedance

The type of activity causing any exceedance

A summary of the communication and consultation with the receiver

The methods and measures to mitigate effects

Mt Eden Main Works CNV DWP –Appendix C SSCNVMPs

A statement of why they reflect best practicable option Communications records are contained in the communication and consultation plan (CCP). This SSCNMP will be updated to summarise engagement and any agreed site-specific measures.

Page 172 Mt Eden Main Works CNV DWP –Appendix C SSCNVMPs