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DOWNTOWN PUBLIC SPACE CONSTRUCTION NOISE AND VIBRATION

MANAGEMENT PLAN Rp 004 R07 20180490 | 28 May 2019

http://www.marshallday.com

84 Symonds Street

PO Box 5811 Wellesley Street

Auckland 1141 New Zealand

T: +64 9 379 7822 F: +64 9 309 3540

www.marshallday.com

Project: DOWNTOWN PUBLIC SPACE

Prepared for: Auckland Transport Private Bag 92250 Auckland 1142

Attention: Haylee Miniprio

Report No.: Rp 004 R07 20180490

Disclaimer

Reports produced by Marshall Day Acoustics Limited are based on a specific scope, conditions and limitations, as agreed between Marshall Day Acoustics and the Client. Information and/or report(s) prepared by Marshall Day Acoustics may not be suitable for uses other than the specific project. No parties other than the Client should use any information and/or report(s) without first conferring with Marshall Day Acoustics.

The advice given herein is for acoustic purposes only. Relevant authorities and experts should be consulted with regard to compliance with regulations or requirements governing areas other than acoustics.

Copyright

The concepts and information contained in this document are the property of Marshall Day Acoustics Limited. Use or copying of this document in whole or in part without the written permission of Marshall Day Acoustics constitutes an infringement of copyright. Information shall not be assigned to a third party without prior consent.

Document Control

Status: Rev: Comments Date: Author: Reviewer:

Draft - For team review 20 Nov 2018 Ben Lawrence Craig Fitzgerald

Draft 01 For Resource Consent 17 Dec 2018 - Craig Fitzgerald

Draft 02 For Resource Consent 14 Feb 2019 - Craig Fitzgerald

Draft 03 For Resource Consent 12 Apr 2019 Ben Lawrence Craig Fitzgerald

Draft 04 For Resource Consent 16 Apr 2019 Ben Lawrence Craig Fitzgerald

Draft 05 Minor updates 6 May 2019 Ben Lawrence -




This document may not be reproduced in full or in part without the written consent of Marshall Day Acoustics Limited

Rp 004 R07 20180490 BL DPS (Construction Noise and Vibration Management Plan).docx 3

TABLE OF CONTENTS

1.0 INTRODUCTION .......................................................................................................................................... 5

2.0 PROJECT DESCRIPTION ............................................................................................................................... 5

2.1 Overview ..................................................................................................................................................... 5

2.2 Construction Methodology ........................................................................................................................ 5

2.3 Contact Details ............................................................................................................................................ 6

3.0 PERFORMANCE STANDARDS ..................................................................................................................... 7

3.1 Conditions of Consent ................................................................................................................................ 7

3.2 Noise ............................................................................................................................................................ 8

3.3 Vibration – Cosmetic Building Damage ..................................................................................................... 8

3.4 Vibration – Amenity.................................................................................................................................... 9

3.5 Underwater Noise .................................................................................................................................... 10

4.0 PREDICTED LEVELS .................................................................................................................................... 11

4.1 Noise .......................................................................................................................................................... 11

4.2 Vibration .................................................................................................................................................... 11


5.0 MITIGATION AND MANAGEMENT .......................................................................................................... 13

5.1 Training ...................................................................................................................................................... 13

5.2 Equipment Selection ................................................................................................................................ 13

5.3 General Measures .................................................................................................................................... 14

5.4 Noise Barriers ............................................................................................................................................ 14

5.5 Concrete Cutting ....................................................................................................................................... 14

5.6 Concrete Breaking .................................................................................................................................... 15

5.7 Piling .......................................................................................................................................................... 15

5.8 Hydro-Demolition ..................................................................................................................................... 16

6.0 ENGAGEMENT .......................................................................................................................................... 16

6.1 Communication ........................................................................................................................................ 16

6.2 Consultation .............................................................................................................................................. 16

6.3 Complaints Response ............................................................................................................................... 17

7.0 MONITORING ............................................................................................................................................ 18

7.1 Noise .......................................................................................................................................................... 18

7.2 Vibration .................................................................................................................................................... 19

7.3 Building Condition Surveys ...................................................................................................................... 20





APPENDIX A GLOSSARY OF TERMINOLOGY

APPENDIX B PROJECT AREA AND SENSITIVE RECEIVERS

APPENDIX C PREDICTED CONSTRUCTION NOISE CONTOURS

APPENDIX D PILING METHOD NEAR FERRY BUILDING




1.0 INTRODUCTION

Marshall Day Acoustics (MDA) has been engaged to prepare a Construction Noise and Vibration Management Plan (CNVMP) for the Downtown Public Space – Stage 1 (the Project). It provides a new public space between Princes Wharf and the Downtown Ferry Terminal (Pier 2).

This CNVMP is required to satisfy Consent Condition 29 (Section 3.1). It identifies the performance standards for the Project and sets out best practicable options (BPO) for noise and vibration management and supports the effects assessment1.

This CNVMP shall be implemented throughout the construction period. It should be considered a ‘living document’ that is expanded and updated as the Project progresses and working conditions become clearer. It is intended to be the primary tool to manage the Project’s construction noise and vibration effects.

A glossary of terminology is included in Appendix A.

2.0 PROJECT DESCRIPTION

2.1 Overview

A site map showing the proposed works and sensitive receivers is attached Appendix B.

The works are proposed to span 12 months, with normal construction hours between 7am – 10pm, Monday – Saturday. There is the potential for low noise activities such as equipment/material deliveries and concrete pours to take place outside of these hours, as well as works inside the terminal during the day on Sundays to avoid peak times. Regardless of compliance, vibro pile driving, concrete cutting and concrete breaking will not be undertaken at night.

2.2 Construction Methodology

Table 1 overleaf summarises the construction methodology components relevant to this assessment2.

Table 1: Summary of construction methodology

Activity Description Likely Equipment

Removal of existing concrete deck for berths 3&43

Saw cut/wire cut through the concrete deck after the existing deck, lift out slab sections using a crane or hydraulic excavators with pavement removal blocks. Concrete breaking may be required if cutting does not achieve a clean separation.

Removal of the wharf decks required for the Quay Street Seawall Upgrades as well as the DPS. It is expected to take 8 weeks in total, with concrete cutting required for 1 – 3 hours per day, for 2 – 3 days per week.

Concrete saw, crane, excavator, concrete breakers (mostly excavator mounted breakers, with jack hammers in sensitive areas)

Pile repair/ removal

Damaged piles will be either repaired by cutting out the damaged section, fully extracting the pile using a crane with choker chain, vibratory pile driver, or cutting at the mudline using an underwater pneumatic saw.

Concrete saw, crane, vibratory pile driver, underwater pneumatic saw

1 MDA report Rp 002 R08 20180490 BL DPS (Assessment of Acoustic Effects)

2 Refer Downer Construction Management Plan (Rev H) and emails with Gavin Jones (Downer) on 1 August 2018

3 This activity is included in the Downtown Ferry Basin Redevelopment. It is included here for information only.




Activity Description Likely Equipment

Pile installation (permanent piles, pile gates, and temporary jetty if chosen method)

Screw piling will be used for piling works in proximity to the Ferry Building to minimise vibration effects, and vibro piling will be used in other areas.

Details on the piling works are as follows:

Permanent piles/temporary jetty piles:

• 813mm diameter steel pile casings

• Up to 2 piles installed per day

• Screw piling: 2 days per pile

• Vibro piling: average of 30 minutes per pile

Once the pile casing has been installed, a crane mounted auger will excavate the pile, then insert the reinforcing before being filled with concrete.

Pile gates:

• Pile gates will be used for the staging and permanent piles. These are likely to use small piles (300mm UC steel or similar)

• Up to 10 gate piles could be installed per day with an average of 2 minutes vibro piling per pile (including removal).

Crane, screw driving rig, vibratory pile driver, hand tools, sediment pumps, drill rig, concrete pump, concrete truck

Deck construction

The concreting of the piles and deck would take place using a tremie chute or concrete pump.

Concrete pump, concrete truck

Works around western kiosk

The following works are to occur around the western kiosk:

• Sawcut around the kiosk wall and break out concrete to carry out assessment of foundations

• If practicable, remove kiosk by lifting or dismantling

If the existing deck is to remain, carry out structural concrete repair using hydro-demolition (4 – 6 weeks estimated)

Concrete saw, crane, excavator, concrete breakers (mostly excavator mounted breakers, with jack hammers in sensitive areas)

Hydro-demolition (potentially required)

2.3 Contact Details

Contact details for the relevant personnel are included in Table 2. The Project Manager is ultimately responsible for implementing this CNVMP.

Table 2: Contacts

Role Name Organisation Phone Email

Project Manager TBC TBC TBC TBC

Acoustic Specialist TBC TBC TBC TBC

Public Complaints TBC TBC TBC TBC




3.0 PERFORMANCE STANDARDS

3.1 Conditions of Consent

Construction Noise and Vibration

27. Construction noise shall be measured and assessed in accordance with the provisions of New Zealand Standard NZS 6803:1999 “Acoustics - Construction Noise” and comply with the following Project Standards at any occupied building unless otherwise provided for in the Construction Noise and Vibration Management Plan (CNVMP) (refer condition 29).

Day Time dB LAeq (30min) dB LAFmax

Monday to Friday 0630 – 2230 75 90

Saturday 0700 – 2300 80 90

3.1.1 Sunday 0900 – 1900 65 85

3.1.2 All other times (night-time) 60 75

28. Construction vibration shall be measured and assessed in accordance with German Standard DIN 4150-3:1999 “Structural Vibration – Part 3: Effects of Vibration on Structures” and comply with AUP:OIP Standard E25.6.30 (1) unless otherwise provided for in the CNVMP (refer condition 29).

Construction Noise and Vibration Management Plan

29. At least 10 working days prior to the commencement of construction, the consent holder shall, in consultation with Heritage New Zealand on matters in relation to New Zealand Heritage List/Rārangi Kōrero built heritage places and Ferry Building Limited on matters in relation to the Ferry Building, update the draft CNVMP included with the consent application documents and submit this to Council for certification in accordance with Conditions 9 to 14. The objectives of the CNVMP are:

a) Identify and adopt the Best Practicable Option (BPO) for the management of construction noise and vibration in order to avoid, mitigate or remedy adverse effects;

b) Define the procedures to be followed when construction activities cannot meet the noise and vibration standards in Conditions 27 and 28;

c) Inform the duration, frequency and timing of works to manage disruption;

d) Require engagement with affected receivers and timely management of complaints;

e) Protect the wellbeing of marine mammals; and

f) Protect the wellbeing of divers.

30. The CNVMP shall include:

a) The relevant measures from NZS 6803:1999 "Acoustics - Construction Noise”, Annex E2 “Noise management plans”;

b) The relevant measures from DIN 4150-3:1999 “Structural vibration - Part 3 Effects of vibration on structures”, Appendix B “Measures for limiting the effects of vibration”;

c) That piling, concrete breaking and concrete cutting activities will be restricted to the hours of 7am to 10pm;

d) That the Consent Holder shall undertake pre-construction building condition surveys in accordance with Condition 40 for any activity that is predicted to exceed the cosmetic building damage limits;




e) That the Consent Holder shall undertake the contingency actions detailed in Condition 96 if the Consent Holder becomes aware of any cosmetic building damage potentially caused wholly, or in part, by the exercise of this consent;

f) Where construction vibration is predicted to exceed 2mm/s within an occupied building, the owners and occupiers of that building must be advised of the works at least 3 working days prior to the works commencing;

g) Timing and effects of all other Downtown Infrastructure Development Programme projects and how potential cumulative noise and vibration effects can be avoided, managed and/or mitigated; and

h) Procedures to manage the underwater noise effects on marine mammals and divers from vibratory pile driving in accordance with Condition 31.

31. The Consent Holder shall:

a) Undertake visual monitoring for the 30 minutes prior to the commencement of vibratory pile driving each day to identify whether or not there are marine mammals or divers within the underwater management zones (Condition 32). Vibratory pile driving shall not commence while marine mammals or divers are known to be within the management zones;

b) Minimise duty cycle where practicable (e.g. duration); and

c) Continue visual monitoring during vibratory pile driving and implement shut down procedures if marine mammals or divers are sighted within the management zones.

32. Prior to the commencement of vibratory piling, the consent holder shall engage a suitably qualified and experienced underwater acoustics expert to:

a) Undertake noise level monitoring of the first vibratory pile driving works to determine the level of underwater noise and the frequency spectrum for the purpose of verifying the management zones; and

b) Update the management zones for vibratory piling using the criteria in the National Oceanic and Atmospheric Administration: “Technical Guidance for Assessing the Effects on Anthropogenic Sound on Marine Mammal Hearing” (July 2016).

Both (a) and (b) must be completed within 7 days of vibratory piling commencing.

Advice Note:

Updating the management zones for vibratory piling in accordance with Condition 31 may be carried out based on measurement data obtained from other projects underway in the Waitemata Harbour if that data is available and is appropriate. The TTS zones shall be observed by a Marine Mammal Observer (MMO) or a person trained to the satisfaction of an MMO. The observer may be shared between projects provided an MMO is satisfied that the observation of the TTS zones of all shared projects can be observed effectively.

3.2 Noise

Construction noise shall comply with the Project Standards in Condition 27 (Section 3.1) unless otherwise provided for in this CNVMP.

Construction noise must be measured and assessed in accordance with the provisions of New Zealand Standard NZS 6803:1999 “Acoustics - Construction Noise”. The Project Standards apply at 1m from external façades of occupied buildings.

3.3 Vibration – Cosmetic Building Damage

Construction vibration shall comply with Auckland Unitary Plan (Operative in Part) (AUP(OP)) rule E25.6.30 (1)(a) in Condition 28 (Section 3.1) unless otherwise provided for in this CNVMP.




AUP(OP) rule E25.6.30 (1)(a) requires construction vibration to be measured and assessed in accordance with German Standard DIN 4150-3:1999 “Structural vibration – Part 3: Effects of vibration on structures”. The short-term (transient)4 vibration limits in Figure 1 apply at building foundations in any axis. The vibration limits in all other cases are summarised in Table 3 overleaf.

Figure 1: Short-term (transient)1 vibration at building foundations (DIN 4150-3 1999: Figure 1)

Table 3: Vibration at horizontal plane of highest floor (DIN 4150-3 1999: Tables 1 and 3)

Structure Type Peak Particle Velocity Vibration Level (mm/s)

Short-term (transient)1 Long-term (continuous)5, 6

Line 1. Commercial or Industrial buildings 40 10

Line 2. Residential buildings 15 5

Line 3. Historic or Sensitive Structures 8 2.5

The criteria relate to the avoidance of cosmetic building damage, such as cracking in paint or plasterwork. Cosmetic building damage effects are deemed ‘minor damage’ in the Standard and can generally be easily repaired. The cosmetic building damage thresholds are much lower than those that would result in structural damage. The Standard states: "Experience has shown that if these values are complied with, damage that reduces the serviceability of the building will not occur."

3.4 Vibration – Amenity

Construction vibration shall comply with AUP(OP) rule E25.6.30 (1)(b) in Condition 28 (Section 3.1) unless otherwise provided for in this CNVMP.

4 Short-term (transient) vibration is “vibration which does not occur often enough to cause structural fatigue and which does not produce resonance in the structure being evaluated”

5 Long-term (continuous) vibration includes types not covered by the short-term vibration definition

6 The long-term (continuous) criteria can apply at all floor levels, but levels are normally highest at the top floor




AUP(OP) rule E25.6.30 (1)(b) requires construction vibration to comply with the limits in Table 4 in any axis when measured in the corner of the floor of the storey of interest for multi-storey buildings, or within 500mm of ground level at the foundation of a single storey building.

Table 4: Vibration amenity at horizontal plane of floor level of interest (AUP(OP) E25.6.30.1)

Receiver Peak Particle Velocity Vibration Level (mm/s)

0700 - 2200 2200 - 0700

Occupied activity sensitive to noise 2 0.3

Other occupied buildings 2 2

Where construction vibration from daytime works (7am to 6pm) is predicted to exceed 2mm/s PPV for no more than three days, the occupants of all buildings within 50m must be advised of the works no less than 3 days prior to the works commencing and the vibration level must not exceed 5mm/s (Section 6.1).

Furthermore, Condition 30e) (Section 3.1) requires owners and occupiers of buildings to be advised at least 3 working days prior to works where construction vibration is predicted to exceed 2mm/s.

3.5 Underwater Noise

The marine mammal ‘species of interest’ in the Waitematā Harbour are Orca and bottlenose dolphin, which are classified as mid-frequency (MF) cetaceans. Fur seals may also be present in the area, which are classified as otariid pinnipeds (OW), and there is also a resident leopard seal that is occasionally sighted in the harbour which is classified as a phocid pinniped (PW).

The NOAA criteria for the species of interest are summarised Table 5.

Table 5: Summary of NOAA TTS and PTS thresholds

Species Threshold Type Non-impulsive sources (e.g. vibro piling)

Mid-frequency cetaceans (orca, bottlenose dolphin, common dolphin)

TTS 178 dB SELcum(mf)

PTS 198 dB SELcum(mf)

Otariid pinnipeds (fur seals)

TTS 199 dB SELcum(pw)

PTS 219 dB SELcum(pw)

Phocid pinnipeds (leopard seal)

TTS 181 dB SELcum(pw)

PTS 201 dB SELcum(pw)

Note: SEL thresholds are in dB re 1 μPa2s and Lpeak thresholds are in dB re 1 μPa

Safety guidelines for human divers published in a NATO Undersea Research Centre (NURC) publication7 recommends divers should avoid areas where noise levels exceed 160 dB re 1 μPa rms (125Hz – 4kHz). This is considered an acceptable threshold for experienced divers, or those in shallow water at the coastline.

7 ‘NATO Undersea Research Centre Human Diver and Marine Mammal Risk Mitigation Rules and Procedures’, NURC-SP-2006-008, September 2006




4.0 PREDICTED LEVELS

4.1 Noise

Table 6 provides indicative construction noise levels for proposed activities. It should be used by the Project Manager (or nominated person) prior to construction to inform what equipment will require mitigation and/or management and when. It should be kept up to date by the Acoustic Specialist when new information becomes apparent through noise monitoring (Section 7.1) or other means.

The shaded cells in Table 6 show where noise levels above the daytime Project Standard of 75 dB LAeq are predicted.

The predicted levels do not include acoustic screening, with the exception of the potential hydro-demolition works. For this activity, it is assumed that the site will be enclosed using noise barriers to block line of sight to surrounding receivers (see Section 5.4).

Table 6: Indicative noise levels at 1m from a building façade

Equipment Sound power level

(dB LwA)

Noise level (dB LAeq) at distance of

Setback to achieve compliance (m)

Activity 10m 20m 50m 75 dB LAeq (daytime)

60 dB LAeq

(night-time)

Demolition Large concrete breaker

121 96 90 81 83 331

Concrete cutting 115 90 84 75 48 191

Small concrete breaker

111 86 80 71 33 132

Excavator 20T 103 78 72 63 14 63

Piling Vibro piling 116 91 85 76 52 209

Bored piling 111 86 80 71 33 132

General Concrete truck and pump discharging

103 78 72 63 14 63

Mobile crane (35t) operating

98 73 67 58 8 40

Mobile crane (35t) idling

88 63 57 48 3 14

Deck/pile repair

Hydro-demolition 114 89 83 74 44 174

The shaded cells in Table 6 show the distances from the noise source where noise levels above the daytime Project Standard of 75 dB LAeq are predicted. The public facing side of the work site would be enclosed by 2 – 2.4m high noise barriers (refer Section 5.4). Effective noise barriers typically reduce the received noise level by 10 decibels where they block line-of-sight from source to receiver.

Figures 1 – 4 in Appendix C present predicted screw and vibro piling noise levels at four representative locations. These activities were chosen for detailed modelling because they are likely to be the loudest activities that would operate for extended periods.

4.2 Vibration

Table 7 provides indicative construction vibration levels for proposed activities that have the potential to generate appreciable levels. It should be used by the Project Manager (or nominated




person) prior to construction to inform what equipment will require mitigation and/or management and when. It should be kept up to date by the Acoustic Specialist when new information becomes apparent through vibration monitoring (Section 7.2) or other means.

Table 7: Indicative distances (m) to comply with vibration limits at building foundations

Equipment Amenity 8

Cosmetic Building Damage 9

Heritage & Sensitive Structures

Residential Commercial

Vibrated pile casings 10 19 15 6 3

Concrete breaker 10, 11:

- Large 20T excavator mounted 19 16 10 7

- Small 1-5T excavator mounted 4 4 2 1

Specific management measures for concrete breaking and piling are included in Sections 5.6 and 5.7. The following paragraphs summarise the residual vibration effects.

There are no residential or commercial buildings within the relevant setbacks in Table 712.

The following heritage features or buildings are within the Heritage & Sensitive Structures setbacks in Table 7:

• Auckland Harbour Board Fence if not relocated prior (vibration sensitive features primarily the original cast iron work and glazing)

• Queens Wharf (the concrete wharf structure, stairs, original Ferry Shelter within the Downtown Ferry Terminal etc) is a heritage structure but is not sensitive to cosmetic damage from construction vibration (e.g. plaster or paint cracking)13

• East and West Kiosks if not relocated prior (most vibration sensitive feature is the clay tile ceiling)

A pre-construction building condition survey is recommended for any activity which has the potential to exceed the cosmetic building damage vibration limits (e.g. if vibro piling is required within 15m of either kiosk). The Built Heritage Construction Management Plan will ensure any resulting vibration damage to the relevant historic buildings and features above are identified and remedied. It references the vibration monitoring provisions in Section 7.2 and Building Condition Survey process in Section 7.3.

Construction vibration is predicted to generally comply with the amenity limits. Vibration may be perceptible at times, but with prior communication there is unlikely to be any notable disturbance.

8 AUP OIP rule E25.6.30 (1)(b), summarised in Section 3.4

9 AUP OIP rule E25.6.30 (1)(a), summarised in Section 3.3

10 Assumes continuous vibration criterion from DIN 4150-3 :1999 are applicable

11 Based on regression analysis of available measurements, no safety factor included assuming sawcut used to be provide structural discontinuity prior to breaking in accordance with method in Section 5.

12 Preliminary building classifications. These should be confirmed by a suitably qualified person (e.g. structural engineer, in liaison with a heritage expert as appropriate)

13 John Brown (Plan Heritage), discussions with Craig Fitzgerald (MDA) on 16 August 2018.





The indicative exclusion zones for piling are presented in Table 8. The zones have been provided as distances from the pile being installed. The zones should be updated as appropriate and in response to monitoring (Section 7.4).

The zones are should graphically in Appendix C.

The 310mm steel UC piles required for the pile gates and timber fender piles are negligible in comparison to the main piles because they are small and would take minimal time to drive in. They are not considered further.

Table 8: Exclusion zones

Species Threshold Zone

All species PTS – peak Below criteria

TTS – peak Below criteria

Mid-frequency cetaceans (orca, bottlenose dolphin, common dolphin)

PTS – cumulative exposure <20m

TTS – cumulative exposure 80m

Otariid pinnipeds (fur seals)

PTS – cumulative exposure Below criteria


Phocid pinnipeds (leopard seal)

PTS – cumulative exposure <20m


Divers 160 dB rms safety guideline 55m

5.0 MITIGATION AND MANAGEMENT

5.1 Training

All staff will participate in an induction training session prior to the start of construction, with attention given to the following matters:

• Construction noise and vibration limits (Section 3.0)

• Activities with the potential to generate high levels of noise and/or vibration (Section 4.0)

• Noise and vibration mitigation and management procedures (Section 5.0)

• The sensitivity of receivers and any operational requirements and constraints identified through communication and consultation (Section 6.0)

Awareness of current noise and vibration matters on, or near active worksites, will be addressed during regular site meetings and/or ‘toolbox’ training sessions.

5.2 Equipment Selection

When selecting construction equipment, where practicable:

• Prioritise quieter construction methodologies (e.g. bored piling instead of vibro piling)

• Prioritise electric motors over diesel engines

• Prioritise rubber tracked equipment over steel tracked equipment

• Equipment should be suitably sized for the proposed task

• Equipment should be maintained and fitted with exhaust silencers and engine covers




• Avoid tonal reversing or warning alarms (suitable alternatives may include flashing lights, broadband audible alarms or reversing cameras inside vehicles)

5.3 General Measures

Complaints can arise whether or not noise and vibration levels comply with the Project limits. To avoid complaints, general mitigation and management measures include, but are not be limited to, the following:

• Avoid unnecessary noise, such as shouting, the use of horns, loud site radios, rough handling of material and equipment, and banging or shaking excavator buckets

• Minimise construction duration near sensitive receivers

• Utilise noise barriers where appropriate (Section 5.4)

• Implement specialised mitigation measures for concrete cutting (Section 5.5), concrete breaking (Section 5.6), piling (Section 5.7) and hydro-demolition

• Ensure advanced engagement is complete (Section 6.0) prior to commencing activities that are predicted to exceed the noise and vibration performance standards (Section 4.0)

• Undertake monitoring as appropriate (Section 7.0)

5.4 Noise Barriers

Temporary noise barriers should be used where practicable as they would noticeably reduce the construction noise level for sources such as concrete cutting (see Section 4.1). They should be installed prior to works commencing and maintained throughout the works. Effective noise barriers typically reduce the received noise level by 10 decibels.

Where practicable, the following guidelines should be incorporated in the design and utilisation of temporary noise barriers:

• The panels should be constructed from materials with a minimum surface mass of 6.5 kg/m2. Suitable panels include 12 mm plywood or the following proprietary ‘noise curtains’:

o Duraflex ‘Noise Control Barrier - Performance Series’ (www.duraflex.co.nz)

o Soundex ‘Acoustic Curtain - Performance Series' (www.ultimate-solutions.co.nz)

o Flexshield ‘Sonic Curtain with 4 kg/m2 mass loaded vinyl backing’ (www.flexshield.co.nz)

o Alternatives should be approved by a suitably qualified acoustic specialist because some proprietary noise curtains have insufficient surface mass for general use

• The panels should be a minimum height of 2m, and higher if practicable to block line-of-sight

• The panels should be abutted or overlapped to provide a continuous screen without gaps at the bottom or sides of the panels

• The panels should be positioned as close as practicable to the noisy construction activity to block line-of-sight between the activity and noise sensitive receivers

5.5 Concrete Cutting

• Avoid night-time periods and Sundays/public holidays

• Minimise the cutting period, and, the number of cutting periods (e.g. complete all cutting in one extended period rather than two shorter periods with the same overall duration) where practicable

• Select blades that are sharp, maximise the number of teeth, minimise the blade width, minimise gullet depth, and have built in vibration damping slots (where appropriate)


http://www.duraflex.co.nz/

http://www.ultimate-solutions.co.nz/

http://www.flexshield.co.nz/



• Use a unit fitted with a blade shroud and a ‘quiet’ blade type (tooth design)

• Enclose the cutting area with a temporary noise barrier as described in Section 5.4

5.6 Concrete Breaking

• Avoid evening and night-time periods and Sundays/public holidays

• An initial perimeter saw cut should be made at the perimeter to reduce vibration transfer to nearby buildings where practicable

• Minimise the volume of breaking where practicable (e.g. use a crushing shear or pulveriser attachment in place of a breaker, or use a cut and lift approach to enable breaking offsite)

• Minimise the duration of breaking, and, the number of breaking periods where practicable (e.g. complete all breaking in one extended period rather than two shorter periods with the same overall duration)

• Concrete breakers must be suitably sized to enable compliance with the relevant cosmetic building damage limits. This includes use of a small excavator mounted breaker within 16m of heritage buildings and a hand breaker within 4m

• Match the chisel/tip type to the material and use a dampened bit to avoid ringing

• Avoid ‘blank’ firing by engaging the material before commencing and stopping before it fires through the material

5.7 Piling

Screw piling is proposed within 36m of the Ferry Building to enable compliance with the cosmetic damage limits for Heritage and Sensitive Structures (refer Appendix D showing piling constraints). This design constraint is based on a precautionary approach. Vibro piling methods will only be used within 36m where vibration monitoring demonstrates compliance will be achieved.

If the east and west kiosks are not relocated prior to construction, then use of screw piling or pile jetting (see Section 8.2.3 of the Construction Management Plan) within 15m of these buildings can enable compliance to be achieved.

Other general measures include:

• Avoid vibro pile driving methods during the evening and night-time periods and during the day on Sundays/public holidays

• Avoid alternating rotation of the bored piling auger to loosen spoil into the muck bin. The kelly bit connection creates very loud banging that often results in noise complaints. It is understood this action is unnecessary for general auger use. However, it is understood this action is necessary specifically when a coring barrel is used to drill through obstructions (due to Health and Safety issues related to alternative ways of loosening material from the bit)

The following procedure should be implemented to manage the effects of underwater noise on marine mammals and divers:

• Undertake visual monitoring 30 minutes prior to commencing piling operations to ensure there are no marine mammals or divers in the area

• Minimise duty cycle

• Undertake visual monitoring during piling operations to identify any marine mammals or divers that enter the area




• Implement shut down procedures when a marine mammal or diver is identified within the management zones (based on the current methodology, Table 8 in Section 4.3 identifies zones of up to 200m)

5.8 Hydro-Demolition

Hydro-demolition may be required if the decking and piles beneath the western kiosk are to remain in place and be repaired. These works have the potential to generate high noise levels at nearby receivers, so the following mitigation and management measures should be incorporated:

• Install flexible barriers such as mass loaded vinyl ‘noise curtains’ (see Section 5.4) can be suspended from the edge of the wharf and extend down to the water level to block line of sight into the works area

• Schedule the works to minimise disturbance to sensitive receivers (e.g. carry out the works during the morning before the restaurants are open/busy)

• Communicate the works times and durations to surrounding receivers (see Section 6.1)

6.0 ENGAGEMENT

6.1 Communication

Written communication (e.g. newsletter) should be provided to occupiers of buildings within 100m of the site at least 1 week prior to the Project commencing. It should acknowledge that some activities are predicted to generate high noise and/or vibration levels that may result in disturbance for short periods. It should include details of the overall works, its timing, duration and contact details where complaints and enquiries should be directed.

Written communication during the works:

• Public site signage should include contact details

• Regular project updates should include details of impending activities that may result in disturbance, such as concrete cutting (Section 5.5), concrete breaking (Section 5.6), piling (Section 5.7) and hydro-demolition (Section 5.8). It should include scheduled timing and duration of these activities and contact details where complaints and enquiries should be directed. This should include all receivers identified on the site map in Appendix B.

6.2 Consultation

Consultation should be undertaken to address reasonable concerns about noise and vibration on a case-by-case basis. The Project Manager should address any concerns and complaints in accordance with Section 6.3. When discussing vibration concerns, it is important to convey that vibration can be felt at levels well below those that pose a risk of cosmetic building damage. A copy of all correspondence should be made available to Council upon request.

The following process will be implemented by the Project Manager (or nominated person). It is for any construction activity measured to exceed the relevant construction noise and vibration performance standards:

• For exceedances of the construction vibration standards, activities should cease as soon as safe and practicable to do so

• Review the construction methodology, mitigation and management strategies to ensure they represent the BPO

• Undertake consultation with affected parties to understand their sensitivities, including times, activities and locations. Consultation should focus on a collaborative approach to managing the adverse effects from construction noise and vibration. A project representative should be




contactable during works. A record of consultation should be kept at the site office and be available to the affected parties and Council if requested.

• Implement measures to avoid significant adverse effects as agreed with the affected party and monitor the activity to verify the extent of any adverse effects

• For exceedances of the construction vibration cosmetic building damage thresholds in Section 3.3, a detailed building condition survey will be undertaken in accordance with Section 7.3. If damage has not occurred, then that activity can continue provided the measured vibration level is not exceeded further and the construction methodology is the BPO. If damage has occurred, alternative construction methods should be investigated and the consent holder shall repair the damage within a reasonable timeframe.

• The installation of mechanical ventilation should be considered for noise sensitive receivers where external windows must be closed to avoid significant adverse noise effects and no alternative ventilation system is present. This will be implemented only after all other general noise management and mitigation have been deemed impracticable.

• Temporary relocation should be considered for sensitive receivers where all practicable noise and vibration management and mitigation measures have been implemented and significant adverse noise effects are predicted. This will be in exceptional cases only, and advice from the Acoustic Specialist will be sought prior.

6.3 Complaints Response

All construction noise and/or vibration complaints should be recorded in a complaints file that is available to Council on request. For each complaint, an investigation should be undertaken involving the following steps as soon as practicable:

• Acknowledge receipt of the concern or complaint within 24 hours and record:

o Time and date the complaint was received and who received it

o Time and date of the activity subject to the complaint (estimated where not known)

o The name, address and contact details of the complainant (unless they elect not to provide)

o The complainant’s description of the activity and its resulting effects

o Any relief sought by the complainant (e.g. scheduling of the activity)

• Identify the relevant activity and the nature of the works at the time of the complaint

• If a reasonable complaint relates to building damage, inform the on-duty site manager as soon as practicable and cease associated works pending an investigation.

• Review the activity noise and/or vibration levels (Section 4.0) to determine if the activity is predicted to comply with the relevant performance standards (Section 3.0) at the complainants building. Consider addended monitoring to verify the underlying reference level assumptions.

• Review the mitigation and management measures in to ensure the activity represents the BPO (Section 5.0). Review the relief sought by the complainant. Adopt further mitigation and management measures as appropriate.

• Review the potential residual effects (Section 5.0) of activities that are predicted to exceed the relevant performance standards (Section 3.0)

• Report the findings and recommendations to the Project Manager, implement changes and update this CNVMP as appropriate

• Report the outcomes of the investigation to the complainant, identifying where the relief sought by the complainant has been adopted or the reason(s) otherwise.




In most cases, ceasing the activity would provide immediate relief. In some cases, this may not be practicable for safety or other reasons. The complainant shall be kept updated regularly during the time it takes to resolve the matter.

7.0 MONITORING

7.1 Noise

Construction noise levels should be monitored:

• During the first occurrence of vibro piling, concrete cutting, concrete breaking and other activities that are predicted to exceed the Project Standards (Section 4.1)

• In response to a reasonable noise complaint (Section 6.3)

• At 1m from the most affected building façade, or proxy position and adjusted for distance and façade reflections where appropriate

• By a suitably qualified and experienced specialist (e.g. Member of the Acoustical Society of New Zealand) in accordance with the requirements of New Zealand Standard NZS 6803: 1999 “Acoustics - Construction Noise”

• For a representative duration, reported with the measured level (e.g. 65 dB LAeq (30min))

• The results should be used to update Section 4.1 if appropriate

A noise monitoring flowchart is presented in Figure 2.

Figure 2: Noise Monitoring Flow Chart

Limits practicably achieved?

Noise monitoring (Section 7.1):

• During the first use of high noise equipment (Section 4.1)

• In response to a reasonable complaint (Section 6.3) or verify an exceedance

Review mitigation and management strategies to ensure BPO (Section 5.0)

Yes

Implement contingency measures with affected parties

Submit findings to Project Manager

Comply with Project Standards?

(Section 4.1)

Response to a previous non-

compliant measurement? Revise construction

methodology

Yes

Yes

No

No

No




7.2 Vibration

Construction vibration should be monitored:

• During the first occurrence of vibro piling and concrete breaking and other activities that are predicted to exceed the Project Standards (Section 4.2)

• In response to a reasonable vibration complaint (Section 6.3)

• At the closest building foundations and/or the top floor level as appropriate where consent to access the building of interest has been requested and granted

• By a suitably qualified and experienced specialist (e.g. Member of the Acoustical Society of New Zealand) in accordance the requirements of German Standard DIN 4150-3:1999 “Structural vibration – Part 3: Effects of vibration on structures”

• For a representative construction duration, measured in 2 second intervals

• The results should be used to update Section 4.2 if appropriate

A vibration monitoring flowchart is presented in Figure 3.

Figure 3: Vibration Monitoring Flow Chart

Vibration monitoring (Section 7.2):

• During the first use of high vibration equipment (Section 4.2)

• In response to a reasonable complaint (Section 6.3) or verify an exceedance

Notify Project Manager, cease the activity, engage a structural engineer and undertake

a building condition survey

Implement contingency measures with affected parties

Submit findings to Project Manager

Comply with cosmetic building damage limits?

(Section 3.3)

Response to a previous non-

compliant measurement?

Limits practicably achieved?

Revise construction methodology

Review mitigation and management strategies to ensure BPO (Section 5.0)

Building damage?

Damage type?

Seek advice from structural expert before continuing

Heritage building?

Engage heritage expert

Comply with the amenity limits?

(Section 3.4)

Cosmetic Building Damage

Amenity

No

Yes

No

No

Cosmetic

Structural

Yes

No

Yes

No

No

Yes

Yes

Yes




7.3 Building Condition Surveys

Cosmetic building damage (e.g. plaster or paint cracking) is an effect that is relevant to the building owner only (i.e. rather than tenants or leaseholders). People generally perceive vibration at levels significantly lower than those levels that would result in cosmetic building damage and an understanding of this often alleviates receivers’ concerns.

Building condition surveys will be undertaken for other heritage features in accordance with the requirements of the Built Heritage Construction Management Plan. The Project Manager should request in writing the approval of the property owner to undertake a building condition survey at the following times:

• Prior to construction commencing, where vibration is predicted to exceed the cosmetic building damage limits (Section 4.2)

• During construction, where vibration is measured to exceed the cosmetic building damage limits in (Section 4.2) and/or in response to a reasonable claim of damage from construction vibration (Section 6.3)

• Post construction, to avoid subsequent claims of damage from construction vibration (Section 6.3)

If a vibration exceedance has occurred but there is no resulting cosmetic damage, then that activity can continue provided the measured vibration level is not exceeded further and the construction methodology already adheres to the BPO. If damage has occurred, alternative construction methods should be investigated and the contractor should rectify the damage at its own cost, as soon as practicable, in consultation with the owner of the property.

Each building condition survey should:

• Be undertaken by a suitably qualified person

• Provide a description of the building

• Determine the appropriate structure type classification14 with respect to DIN 4150-3:1999 “Structural Vibration - Effects of Vibration on Structures” (i.e. historic/sensitive, residential or commercial/industrial)

• Document and photograph the condition of the building, including any cosmetic and/or structural damage

• The results should be provided to the property owner and be available to Council on request

14 Classifications with respect to Tables 1 and 3 of DIN 4150-3:1999 “Structural Vibration - Effects of Vibration on Structures” (i.e. historic/sensitive, residential or commercial/industrial)





A Marine Mammal Observer (MMO) or a person trained to the satisfaction of an MMO will visually monitor the water inside the management zones identified in Section 4.3 and implement the management measures in Section 5.7.

An underwater noise monitoring flowchart is presented in Figure 4.

Figure 4: Underwater Noise Monitoring Flow Chart

Underwater construction noise levels should be monitored:

• During the first occurrences of vibratory piling

• By the Acoustic Specialist (Section 2.3)

• For a representative duration and representative pile size

• The results should be used to update Section 4.3 and Section 5.7 as appropriate

The underwater noise measurements will be undertaken using compact self-contained hydrophones (underwater sound recording units). The acoustic specialist will supply the hydrophone units and rigging. The contractor will supply a boat to deploy and retrieve the units at agreed locations. Calm sea state is required for good acoustic measurement conditions.

Underwater Noise monitoring (Section 7.4): During the first occurrence of vibro driven piles (Section 5.7)

Shut down (Section 5.7)

Report event to Project Manager

Marine mammal within TTS zones

(Section 4.3)?

Yes

Yes

No

No

Commence visual monitoring of TTS zones

30 minutes prior to pile driving (Section 5.7)

Marine mammal within TTS zones

(Section 4.3)?

Subsequent vibro driven piles

No Visual

monitoring

stopped?

Yes

Yes




APPENDIX A GLOSSARY OF TERMINOLOGY

Noise A sound that is unwanted by, or distracting to, the receiver.

dB Decibel (dB) is the unit of sound level. Expressed as a logarithmic ratio of sound pressure (P) relative to a reference pressure (Pr), where dB = 20 x log(P/Pr). The convention is a reference

pressure of Pr = 20 Pa in air and Pr = 1 Pa underwater.

dBA The unit of sound level which has its frequency characteristics modified by a filter (A-weighted) to more closely approximate the frequency bias of the human ear. A-weighting is used in airborne acoustics.

LAeq (t) The equivalent continuous (time-averaged) A-weighted sound level commonly referred to as the average level. The suffix (t) represents the period, e.g. (8 h) would represent a period of 8 hours, (15 min) would represent a period of 15 minutes and (2200-0700) would represent a measurement time between 10 pm and 7 am.

LAFmax The A-weighted maximum noise level. The highest noise level which occurs during the measurement period.

NZS 6803:1999 New Zealand Standard NZS 6803: 1999 “Acoustics - Construction Noise”

Vibration When an object vibrates, it moves rapidly up and down or from side to side. The magnitude of the sensation when feeling a vibrating object is related to the vibration velocity. Vibration can occur in any direction. When vibration velocities are described, it can be either the total vibration velocity, which includes all directions, or it can be separated into vertical (up and down vibration), horizontal transverse (side to side) and horizontal longitudinal direction (front to back) components.

PPV Peak Particle Velocity (PPV) is the measure of the vibration amplitude, zero to maximum, measured in mm/s.

BS 5228:2009 British Standard BS 5228:2009 “Code of practice for noise and vibration control on construction and open sites, Part 1: Noise, Part 2: Vibration”

DIN 4150-3:1999 German Standard DIN 4150-3:1999 “Structural Vibration - Effects of Vibration on Structures”

Underwater noise A sound that is unwanted by, or distracting to, the receiver underwater.

Lpeak The peak instantaneous pressure level (un-weighted).

RMS Root Mean Square (RMS) is the equivalent continuous (time-averaged) sound level commonly referred to as the average level (period matches the event duration).

SEL Sound exposure level (SEL) is the total sound energy of an event, normalised to an average sound level over one second. It is the time-integrated, sound-pressure-squared level. SEL is typically used to compare transient sound events having different time durations, pressure levels and temporal characteristics.

SELcum The SELcum is the ‘cumulative’ sound energy of all events in a 24-hour period, normalised to an average sound level over one second.

TTS Temporary Threshold Shift (TTS) is the temporary loss of hearing caused by sound exposure. The duration of TTS varies depending on the nature of the stimulus, but there is generally recovery of full hearing over time.

PTS Permanent Threshold Shift (PTS) is the permanent loss of hearing caused by acoustic trauma. PTS results in irreversible damage to the sensory hair cells of the ear.




APPENDIX B PROJECT AREA AND SENSITIVE RECEIVERS

Pier 2 Building




APPENDIX C PREDICTED CONSTRUCTION NOISE CONTOURS

The following airborne construction noise contours are attached:

• Figure 1: Screw Piling Ferry Building

• Figure 2: Vibro Piling Opposite Albert Street

• Figure 3: Vibro Piling Opposite M Social

• Figure 4: Vibro Piling Princes Wharf

The following construction underwater noise management zones are attached:

• Figure 5: Vibro Piling

APPENDIX D PILING METHOD NEAR FERRY BUILDING

Screw piling within 36m of Ferry Building

Vibro piling for all other piles


Sourced from the LINZ Data Service and licensed for re-use under the Creative Commons Attribution 4.0 New Zealand licence±0 8.5 17 25.5 344.25

Meters

Folder I:\JOBS\2018\20180490\06 Drawings\GIS\GIS 001 20180490 BL DPS\

Scale @ A3: 1:1,000Prepared by: Ben LawrenceDate: 17/04/2019

DPS - Underwater Management ZonesFigure 5: 813mm Steel Vibro Piling (2 piles/day @ 30 mins/pile)

Noise Sources

Piling

Management Zones

Mid-Frequency Cetaceans

Otariid Pinnipeds

Phocid Pinnipeds

Divers

downtown public space construction noise and … · underwater pneumatic saw . 1. ... the...

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