Appendix P. Construction Noise Assessment. (Prepared by Marshall Day Acoustics, November 2013)

Transcription

1 Appendix P Construction Noise Assessment (Prepared by Marshall Day Acoustics, November 2013)

2 WRIGHTS ROAD STORAGE PONDS Construction Noise Assessment Rp 001 R C 5 December 2013

3 Project: Prepared for: Attention: Report No.: WRIGHTS ROAD STORAGE PONDS Waimakariri Irrigation Ltd c/o Pattle Delamore Partners Ltd PO Box 389 Christchurch 8140 Lynn Torgerson Rp 001 R C Disclaimer Reports produced by Marshall Day Acoustics Limited are prepared based on the Client s objective and 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 original intended objective. No parties other than the Client should use any information and/or report(s) without first conferring with Marshall Day 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: Approved 5 Nov 2013 J Farren R Blakelock Approved Nov 2013 J Farren R Blakelock Approved Nov 2013 J Farren R Blakelock Approved Dec 2013 J Farren R Hay

4 EXECUTIVE SUMMARY Marshall Day Acoustics has been engaged to assess noise associated with the construction of proposed storage ponds and associated structures at the corner of Wrights Road and Dixon Road, Burnt Hill, North Canterbury. The appropriate means of assessing and managing construction noise in New Zealand is through the application of NZS 6803: 1999 Acoustics - Construction Noise. We note that Rule in the District Plan refers to the 1984 provisional form of the Standard. However, we consider that any construction activity that complies with the requirements of NZS 6803: 1999 will also satisfy the intent of Rule and can be considered to comply with this Rule. The applicable recommended noise limits from the Standard for long term construction are provided in Table 1. These roughly translate into daytime and night-time noise limits of 70 db L Aeq and 45 db L Aeq respectively at nearest residences. The formation of perimeter bunds forming the storage ponds has the potential to exceed the daytime noise limit of 70 db L Aeq at those residences closest to the site boundaries. These dwellings are labelled as 1, 2, 4 and 7 in Figure 1. Once perimeter bunds have been formed, they will serve as noise barriers for construction activities on the remainder of the site and are expected to provide up to 10 dba noise reduction. To ensure that construction noise effects are acceptable, we recommend conditions of consent requiring that: Construction noise should be assessed and managed with reference to NZS 6803: 1999 Acoustics - Construction Noise ; and A Construction Noise Management Plan is developed for the site. Rp 001 R C Wrights Rd Storage Ponds (Construction noise assessment).docx Page 3 of 27

5 TABLE OF CONTENTS 1.0 INTRODUCTION PROPOSED ACTIVITY SITE DESCRIPTION & EXISTING ENVIRONMENT ASSESSMENT CRITERIA Construction noise standards NZS 6803:1999 Acoustics - Construction Noise Construction management Construction vibration PREDICTED NOISE LEVELS NOISE CONTOUR PLOTS Scenario 1 South east corner Scenario 2 - North east corner Scenario 3 North-west corner NOISE MANAGEMENT AND CONTROL CONCLUSIONS & RECOMMENDATIONS APPENDIX A APPENDIX B APPENDIX C GLOSSARY OF TERMINOLOGY CONSTRUCTION NOISE CONTOUR PLOTS DRAFT CONSTRUCTION NOISE MANAGEMENT PLAN Rp 001 R C Wrights Rd Storage Ponds (Construction noise assessment).docx Page 4 of 27

6 1.0 INTRODUCTION Waimakariri Irrigation Limited (WIL) has engaged Marshall Day Acoustics to perform a review of noise effects associated with the proposed construction of storage ponds and associated structures at the corner of Wrights Road and Dixon Road, Burnt Hill, North Canterbury. Our construction noise review has come as the result of a specific request for further information from Waimakariri District Council dated 7 October 2013 which requires: 1. An assessment by an appropriately qualified and experienced person, against the requirements of NZS6803:1999 taking into account the proximity of nearby residences, duration of works and identified potential mitigation measures. The project site and nearest dwellings are described in Section 2.0 and are shown in Figure 1. This report provides: A description of the proposed activity; A description of the receiving environment and existing ambient noise levels; A discussion of the recommended noise level criteria contained within NZS6803:1999; Predicted noise levels from construction activities at nearest residences; and Recommendations for managing construction noise effects. A glossary of acoustics terminology used in this report is provided in Appendix A. 2.0 PROPOSED ACTIVITY A detailed description of the proposed storage ponds has been provided elsewhere as part of the resource consent application. However, the greatest potential for noise effects is during the construction phase of the project as mobile construction equipment will be used to both excavate material on-site and to build the perimeter embankments. Construction equipment is likely to include: Earthmoving scrapers; Bulldozers; Graders; Dump Trucks; Water trucks; Concrete trucks; and Gravel screening plant. This equipment will be distributed over the entire site during the construction phase and, at times, will be operating in relatively close proximity to dwellings. For example, mobile equipment will be used to form the perimeter bunds and this will occur within about Rp 001 R C Wrights Rd Storage Ponds (Construction noise assessment).docx Page 5 of 27

7 40 metres of dwellings near the south east corner of the site. In contrast, the typical distance to the centre of the site where construction activities may occur is 700 metres. Once the perimeter bunds are formed, these will act as noise barriers for activities occurring within the site. The proposed construction hours are 7am to 7pm, Monday to Saturday. 3.0 SITE DESCRIPTION & EXISTING ENVIRONMENT The proposed storage ponds and location of the nearest dwellings are shown in Figure 1. Figure 1: Aerial photo showing storage ponds and nearest dwellings (Imagery: Google Earth) A site inspection and noise survey was conducted on 16 October The ambient noise environment during the day is characterised by birdsong, wind generated noise and distant gas gun. Only one vehicle movement (a stock truck) was observed during our noise measurement about half way along the site boundary with Wrights Rd. This measurement location is representative of the general ambient noise levels being experienced by residences in the vicinity. The measured daytime noise levels were 40 db L Aeq and 55 db L Amax which is typical of the rural Canterbury noise environment. Rp 001 R C Wrights Rd Storage Ponds (Construction noise assessment).docx Page 6 of 27

8 4.0 ASSESSMENT CRITERIA Applicable noise criteria relating to construction is provided below: 4.1 Construction noise standards Rule of the Waimakariri District Plan requires that: Construction noise in any zone shall not exceed the recommended limits specified in, and shall be measured and assessed in accordance with, the provisions of NZS:6803: P1984 Measurement and Assessment of Noise from Construction, Maintenance, and Demolition Work. Adjustments and exemptions provided in clause 6 of NZS:6803: P1984 shall apply. We note that the 1984 provisional version of the Standard has been superceded by NZS 6803: 1999 Acoustics - Construction Noise. We further note that Council s request for additional information dated 7 October 2013 makes reference to the 1999 version and we agree that this methodology should be used as it promotes rigorous management of construction noise and ultimately offers better protection for residents compared with the 1984 version. There are a number of differences between the 1984 and 1999 version of the Standard including variation in the numerical limits and the measurement metrics used. Ultimately, we consider that any construction activity that complies with the requirements of NZS 6803: 1999 will also satisfy the intent of Rule and can be considered to comply with this Rule. Rp 001 R C Wrights Rd Storage Ponds (Construction noise assessment).docx Page 7 of 27

9 4.2 NZS 6803:1999 Acoustics - Construction Noise The Construction Noise Standard NZS 6803:1999 Acoustics - Construction Noise contains recommended noise criteria that are appropriate and applicable to noise from construction operations, excluding blasting. The recommended construction noise criteria of NZS 6803:1999 are reproduced in Table 1 and Table 2 below. Table 1: Recommended upper limits for construction noise received in residential zones and dwellings in rural areas (Table 2 from NZS 6803:1999) Time of week Time period Typical duration (dba) Duration of work Short-term duration (dba) Long-term duration (dba) L eq L max L eq L max L eq L max Weekdays Saturdays Sundays and public holidays Table 2: Recommended upper limits for construction noise received in industrial or commercial areas for all days of the year (Table 3 from NZS 6803:1999) Time period Duration of work Typical (dba) Short-term (dba) Long-term (dba) L eq L eq L eq In Table 1 and Table 2: "Short-term means construction work at any one location for up to 14 calendar days; "Typical duration" means construction work at any one location for more than 14 calendar days but less than 20 weeks; and Rp 001 R C Wrights Rd Storage Ponds (Construction noise assessment).docx Page 8 of 27

10 "Long-term means construction work at any one location with a duration exceeding 20 weeks. As we understand that construction activities will occur for around 18 months (currently scheduled for Summer 2013 to Autumn 2015), the long-term duration construction noise limits are applicable. This roughly translates to a daytime noise limit at dwellings of 70 db L Aeq and a night-time noise limit of 45 db L Aeq. The Standard provides for higher noise levels during normal working hours for construction noise received in residential areas in order to enable normal construction activity to take place. For commercial and industrial areas, higher noise criteria are allowed during nighttime when it is less likely that persons or business activities would be affected by construction noise. However, we understand that there are no solely commercial or industrial facilities in the immediate vicinity of the site. The noise criteria of the Standard are widely acknowledged as being appropriate for the control of construction noise, and compliance with these criteria generally ensures acceptability of noise generated by construction activities. 4.3 Construction management In addition to recommended noise levels, NZS6803 provides a requirement for the management of construction noise through the implementation of best practice noise control. In our opinion, the most effective way of managing construction noise on a day-today basis is through the implementation of a Construction Noise Management Plan (CNMP). A CNMP should outline consultant and contractor obligations during construction and should generally include: The project construction noise criteria; Hours of operation; Description of the works and a list of machinery to be used; Staff training/awareness programme; Construction noise monitoring and reporting requirements (if any); and Methods for receiving and handling complaints about construction noise. In addition, the CNMP may contain specific details relating to a particularly sensitive location or activity. These details should be described in a schedule and may include: Activity location, start and finish date; The nearest neighbours to the activity; A location plan; Predictions and mitigation for the activity; Communication with neighbours; and Location, times and type of monitoring. A draft CNMP for the project is provided in Appendix B. Rp 001 R C Wrights Rd Storage Ponds (Construction noise assessment).docx Page 9 of 27

11 4.4 Construction vibration We note that our preliminary review of construction vibration (including vibratory rollers) indicates that levels are likely to be significantly below accepted standards for building damage. We have not considered vibration further. 5.0 PREDICTED NOISE LEVELS In order to assess the potential construction noise levels that might occur on-site, we have predicted noise levels for various construction activities based on equipment sound power levels provided in NZS 6803:1999. It is important to acknowledge that construction noise levels at any one location will vary considerably over the life of a project of this scale. For example, bund forming activities are likely to occur in proximity to some dwellings for a relatively short period of time, but for the majority of the time, construction equipment will be working several hundred metres away from these dwellings and will be significantly quieter. Table 3 provides an indication of the predicted noise levels that can be experienced at various distances from the construction equipment. The predicted noise levels are presented both as a range and an average. Respectively, these describe the range of noise levels different equipment can make, in addition to the likely mean noise level. Rp 001 R C Wrights Rd Storage Ponds (Construction noise assessment).docx Page 10 of 27

12 Activities that have the potential to exceed the recommended daytime noise limit of 70 db L Aeq are shown as bold text. Table 3: NZS 6803 equipment noise levels at 40 m and 300 m Predicted noise level, db L Aeq At 40 metres At 300 metres Equipment Range Average Range Average Bulldozers (up to 350kW/50t) Concrete Mixer Trucks Diesel Water Pumps Dumping Rubble Trucks Scrapers Excavators Loaders Mobile Crusher Mobile Screen Concrete Pumping Steel Sheet Piling - Hydraulic Jacking Steel Sheet Piling - Vibratory kW Tractor Steel Piling - Drop Hammer Vibratory Compaction We note that none of the above predictions take into account the reduction that will be provided by the perimeter bunds once they are formed. Once the bunds are in place, construction noise from equipment immediately on the site side of the bund will be up to around 10 dba lower than presented above. The predicted noise levels indicate that some activities have the potential to exceed the recommended 70 db L Aeq noise limit where they occur relatively close to dwellings. The dwellings where construction noise levels will be highest are Dwellings 1, 2 4 and 7 as identified in Figure 1. Of the activities listed in Table 3 it is the mobile equipment (excavators, scrapers, trucks, loaders, bulldozers etc), that have the greatest potential for noise effects at the nearest residences and therefore appropriate noise management and planning will be required. Appropriate buffer distances should be implemented for static plant such as the crusher. Rp 001 R C Wrights Rd Storage Ponds (Construction noise assessment).docx Page 11 of 27

13 The predicted noise levels at 300 metres are all below the 70 db L Aeq recommended noise limit. This indicates that, for the majority of the time, construction noise levels at residences around the site will be below the 70 db L Aeq limit. 6.0 NOISE CONTOUR PLOTS In order to illustrate how construction noise levels might vary across the site, we have developed noise contour plots that represent three snapshots of construction activity. For each scenario, we have modelled the noise from a bulldozer in close proximity to one cluster of dwellings around the site. The intention in doing this is to represent noise levels that could occur during formation of perimeter bunds. In addition to the bulldozer, other construction activity is also occurring across the remainder of the site. The construction equipment in each predictions: 1 x Bulldozer 2 x Scrapers 2 x Loaders 1 x Crusher 2 x Trucks We consider the proximity of the bulldozer to the dwellings to be representative of worst case activity that could occur for relatively short periods. It is important to note: We have used the average noise levels from Table 3 for each of the noise sources; and The plots do not include any noise reduction from perimeter bunds or noise control fences in practice noise levels are likely to be lower with these in place. Larger scale version of these noise contour plots are provided in Appendix B. Rp 001 R C Wrights Rd Storage Ponds (Construction noise assessment).docx Page 12 of 27

14 6.1 Scenario 1 South east corner The noise level plot in Figure 2 shows that with bulldozing activity occurring approximately 40 metres from Dwelling No.1, construction noise levels will be in the order of 67 db L Aeq. In this scenario, noise levels at dwellings near the boundaries (Nos. 2 to 6) will be between 50 to 57 db L Aeq. Under this scenario, construction noise levels will be below the recommended daytime noise limit of 70 db L Aeq at all dwellings. Figure 2: Scenario 1 Rp 001 R C Wrights Rd Storage Ponds (Construction noise assessment).docx Page 13 of 27

15 6.2 Scenario 2 - North east corner Similarly, with bulldozing activity happening close to the site boundary next to Dwelling Nos. 2 and 3, noise levels at the nearest dwellings are predicted to be 65 and 62 db L Aeq respectively. Noise levels are significantly lower at the other dwellings and are predicted to be in the range 53 to 55 db L Aeq. Construction noise levels are predicted to be less than the NZS 6803 recommended daytime noise limit of 70 db L Aeq under this scenario at all dwellings. Figure 3: Scenario 2 Rp 001 R C Wrights Rd Storage Ponds (Construction noise assessment).docx Page 14 of 27

16 6.3 Scenario 3 North-west corner Under this scenario, equipment operating approximately 40 metres from Dwelling No. 4 will produce noise levels of around 67 db L Aeq. Noise levels at the remaining dwellings will be significantly lower and are predicted to be below the 70 db L Aeq recommended noise limit. Figure 4: Scenario NOISE MANAGEMENT AND CONTROL Below we have provided general recommendations for the management and control of construction noise on the site. Further mitigation and management measures will need to be developed for the actual construction equipment and construction methodologies to be used on-site once this is known. In general, construction noise should be assessed and managed with reference to NZS 6803: 1999 Acoustics - Construction Noise and this requirement should be a condition of consent. In order to implement the recommendations of NZS 6803:1999, a construction noise management plan (CNMP) should be developed for the project. Some specific mitigation measures that should be included in the CNMP are: Mobile crushing and screening plant shall not operate on-site outside of the following hours: 0730 to 1800 hours Monday to Saturday; Rp 001 R C Wrights Rd Storage Ponds (Construction noise assessment).docx Page 15 of 27

17 Mobile crushing and screening plant shall not operate closer than 300 metres from any dwelling unless appropriate noise mitigation has been provided; Where construction work is to occur within 300 metres of dwellings, residents are to be advised of the duration and nature of the works, the likely construction noise levels and what mitigation (if any) is proposed; As soon as practical, storage pond perimeter bunds are to be formed close to dwellings in order that noise barrier benefits can be realised for construction activities on the remainder of the site; Once actual equipment noise levels are known, consideration should be given to localised noise barriers or screens at existing dwellings in consultation with residents; and Pumps and equipment operating at night should be selected for their lowest noise output and should be appropriately located on-site. Additional measures that may be considered for the CNMP include the following: Baseline noise and vibration monitoring at sensitive locations along the proposed scheme; Identification of construction activities that have the potential to generate significant vibration; The design of noise mitigation measures such as temporary noise barriers or enclosures, where required; and Methods for receiving and responding to complaints about construction noise and vibration. A CNMP would typically be developed once resource consent has been obtained and a detailed construction methodology has been developed. 8.0 CONCLUSIONS & RECOMMENDATIONS On the basis of our assessment, the potential exists for relatively high noise levels to occur when construction work is occurring in proximity to existing residences. We consider that construction noise effects will be appropriately managed through the implementation of a construction noise management plan. We recommend that, should consent be granted, the following text is used as the basis for conditions relating to construction noise: Construction noise should be assessed and managed in accordance with NZS 6803: 1999 Acoustics - Construction Noise. A Construction Noise Management Plan (CNMP) should be prepared for the project which should be submitted to [Insert title of appropriate person at council here]. In particular, the CNMP should address how potential noise effects of bund formation will be managed at the nearest residences. We consider that any construction activity that complies with the requirements of the NZS 6803: 1999 will also satisfy the intent of Rule and can be considered to comply with this Rule. Rp 001 R C Wrights Rd Storage Ponds (Construction noise assessment).docx Page 16 of 27

18 APPENDIX A GLOSSARY OF TERMINOLOGY Frequency Hertz (Hz) SPL or L P db dba A-weighting L Aeq (t) L Amax NZS 6801:2008 NZS 6802:2008 NZS 6803:1999 NZS 6806:2010 The number of pressure fluctuation cycles per second of a sound wave. Measured in units of Hertz (Hz). Hertz is the unit of frequency. One hertz is one cycle per second. One thousand hertz is a kilohertz (khz). Sound Pressure Level A logarithmic ratio of a sound pressure measured at distance, relative to the threshold of hearing (20 µpa RMS) and expressed in decibels. Decibel The unit of sound level. Expressed as a logarithmic ratio of sound pressure P relative to a reference pressure of Pr=20 Pa i.e. db = 20 x log(p/pr) The unit of sound level which has its frequency characteristics modified by a filter (A-weighted) so as to more closely approximate the frequency bias of the human ear. The process by which noise levels are corrected to account for the non-linear frequency response of the human ear. The equivalent continuous (time-averaged) A-weighted sound level. This is commonly referred to as the average noise level. The suffix "t" represents the time period to which the noise level relates, e.g. (8 h) would represent a period of 8 hours, (15 min) would represent a period of 15 minutes and ( ) would represent a measurement time between 10 pm and 7 am. The A-weighted maximum noise level. The highest noise level which occurs during the measurement period. New Zealand Standard NZS 6801:2008 Acoustics Measurement of environmental sound New Zealand Standard NZS 6802:2008 Acoustics Environmental Noise New Zealand Standard NZS 6803: 1999 Acoustics - Construction Noise New Zealand Standard NZS 6806:2010 Acoustics - Road-traffic noise - New and altered roads Rp 001 R C Wrights Rd Storage Ponds (Construction noise assessment).docx Page 17 of 27

19 APPENDIX B CONSTRUCTION NOISE CONTOUR PLOTS (following pages) Rp 001 R C Wrights Rd Storage Ponds (Construction noise assessment).docx Page 18 of 27

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23 APPENDIX C DRAFT CONSTRUCTION NOISE MANAGEMENT PLAN (following pages) Rp 001 R C Wrights Rd Storage Ponds (Construction noise assessment).docx Page 22 of 27

24 C1 Purpose and Scope This Construction Noise Management Plan (CNMP or the Plan) addresses the potential construction noise impacts associated with earthworks and construction activities of the Project. This CNMP details noise limits, predicted levels, mitigation measures, monitoring requirements, and communication and complaint procedures, for the following construction duration: Construction start date: [TBC when known] Construction finish date: [TBC when known] This CNMP identifies the noise performance standards that must, where practicable, be complied with. It also sets out best practicable options for noise management for the Project. This CNMP is intended as a framework for the development and implementation of particular noise management and control methodologies to minimise adverse effects on the health and safety of residents and to reduce the adverse impact on the environment. This CNMP will be updated, with the necessary approval, throughout the course of the Project to reflect material changes associated with any changes to the construction methodologies or techniques or the natural environment. The document shall be reviewed annually to ensure that any changes are reflected. C2 Contact details { Role Name Organisation Phone Client Engineer Acoustics advisor Contractor Contractor's acoustics advisor WDC Noise/ Environmental Health Public complaint contact number [Name of person responsible TBC when known] will be responsible for ensuring that this construction noise management plan is correctly implemented. [He/she] will review all documentation relating to construction noise before it is issued. All site personnel will be required to read and sign the construction noise induction form appended to this plan and any relevant schedules. If required, specific training will be provided for site personnel. C3 Construction methodology [This section to be revised once details of construction methods are known] Rp 001 R C Wrights Rd Storage Ponds (Construction noise assessment).docx Page 23 of 27

25 At this stage, the outline construction methodology includes: Site clearance and preparation Pond excavation Embankment construction Pipeline installation Installation of geomembrane Construction of haul roads Note that all of the activities listed may not occur at the same time at all locations. For some construction activities, multiple construction methods are available (such as bored concrete piling or impact steel piling) and the final methodology will be determined during the detailed construction planning process. C4 Location plan [TO BE UPDATED WITH LATEST FIGURE] C5 Criteria Construction noise shall be assessed in accordance with NZS 6803:1999 Acoustics Construction Noise. The limits outlined in the following tables apply at a distance of one metre from the façade of any occupied building: Table 4: Project construction noise criteria: residential receivers Day Time L Aeq L AFmax Weekdays 0630h h 55 db 75 db 0730h h 70 db 85 db 1800h h 65 db 80 db 2000h h 45 db 75 db Saturday 0630h h 45 db 75 db 0730h h 70 db 85 db 1800h h 45 db 75 db 2000h h 45 db 75 db Sundays and public holidays 0630h h 45 db 75 db 0730h h 45 db 75 db 1800h h 55 db 85 db 2000h h 45 db 75 db Table 5: Project construction noise criteria: commercial and industrial receivers Rp 001 R C Wrights Rd Storage Ponds (Construction noise assessment).docx Page 24 of 27

26 Time L Aeq(T) * 0730h h 1800h 0730h 70 db 75 db * T means an assessment duration of no less than 10 minutes and not exceeding 60 minutes There may be circumstances where noise limits cannot be achieved. However appropriate justification and work methodology needs to be carefully considered and provided. C6 Noise sources The following table lists all significant equipment proposed to be used on the site. The sound level for each item of equipment has been estimated from library data in New Zealand Standard NZS 6803: 1999 Acoustics - Construction Noise. Any initial site noise monitoring should validate the noise level data and adjustments for major items of equipment should be made. Table 6: NZS6803 Typical construction noise level at 40 m Predicted noise level, db L Aeq At 40 metres Equipment Range Average Bulldozers (up to 350kW/50t) Concrete Mixer Trucks Diesel Water Pumps Dumping Rubble Trucks Scrapers Excavators Loaders Mobile Crusher Mobile Screen Concrete Pumping Steel Sheet Piling - Hydraulic Jacking Steel Sheet Piling - Vibratory kW Tractor Steel Piling - Drop Hammer Vibratory Compaction Rp 001 R C Wrights Rd Storage Ponds (Construction noise assessment).docx Page 25 of 27

27 C7 Construction noise mitigation and management General noise management and mitigation measures The following general noise mitigation measures should be implemented throughout the construction of the Project as a matter of good practice, and are considered to be the baseline mitigation for most circumstances. Where the implementation of the general mitigation measures described below is dependent of a best practicable approach, this is noted in the appropriate section of the assessment. Where a potential exceedance of the Project construction noise criteria is identified due to a specific activity or in a specific area, the general mitigation measures may not be sufficient to achieve full compliance, and further mitigation should be investigated and implemented where practicable. Training of personnel All personnel on site should be made aware of the importance of operating in the quietest practicable manner and be familiar with the CNMP. All personnel working on the Project, including Contractor employees and subcontractors, have the responsibility of following the requirements of the CNMP at all times while on site or on the way to or from the site. Maintenance of equipment Construction equipment noise levels correlate to the degree of maintenance of such equipment. Potential unnecessary noise sources include squeaking excavator or bulldozer chains, noisy engines and missing or poorly performing exhaust mufflers. All plant should be maintained to ensure that noise emissions remain as low as practicable. Temporary construction noise barriers Where noisy equipment is operating in close proximity to sensitive receivers and noise levels are anticipated to exceed the NZS6803 recommended levels, consideration should be given as to whether it is practicable to screen the noise source from sensitive receivers using temporary noise control barriers. Where practicable and effective, perimeter bunds required for Project should be erected early during construction. Temporary noise barriers should be utilised where practical and effective. Temporary barriers may take the form of shipping containers, timber fences, straw bales or earth mounds and need to be of sufficient height to screen acoustic line-of-sight between the receiver and the noise source. Enclosures Noisy stationary equipment, e.g. generators and pumps, can benefit from enclosures. Any enclosure should be designed by a suitably qualified and experienced acoustic specialist. Enclosures should be utilised if effective and practicable. This would be decided on a caseby-case basis. Selection of low noise plant Low noise plant should be selected and used wherever practicable. Where plant is identified as being particularly noisy, action should be taken to reduce noise emissions. This Rp 001 R C Wrights Rd Storage Ponds (Construction noise assessment).docx Page 26 of 27

28 may involve the fitting of noise mitigation devices, such as silencers or enclosures. In specific areas, noise and vibration emissions may be significantly reduced through the judicious selection and implementation of plant. It is noted that earthmoving equipment from certain manufacturers is markedly quieter than some other manufacturer s products. Preference should be given to procuring lower noise generating equipment for the Project. Reversing alarms Where practical, Equipment should be fitted with alternatives to tonal reversing alarms. Those alarms may include, but not be limited to, broad band auditory devices or visual (rather than audible) alarms. C8 C9 Monitoring Construction noise monitoring shall be conducted as necessary by a suitably qualified and experienced independent consultant [or by the following staff include if appropriate] in accordance with NZS 6801:2008 and NZS 6803:1999. Monitoring may be conducted at the following times, Baseline monitoring prior to construction work commencing at positions representative of noise sensitive locations within 300 metres of construction activity. When the works start to verify the sound levels assumed for each of the major items of equipment, and to assess the effectiveness of noise control measures and implementation of this plan. At regular intervals during the works, at least every two weeks, to check ongoing compliance with the construction noise limits. During critical phases of construction, such as during the use of heavy earth moving machinery, rock breaking, and other noisy activities within 50 metres of neighbours. As required by a construction noise management schedule. In response to reasonable complaints being received. Complaints The following procedure shall be followed for all noise complaints: 1. All noise complaints should be immediately directed to [TBC when known]. 2. An initial response will be made and recorded. Depending on the nature of the complaint the initial response could be to immediately cease the activity pending investigation, or to replace an item of equipment. However, in some cases it might not be practicable to provide immediate relief. The complainant and council will be informed of actions taken. Contact details for council are recorded in the Introduction section of this plan. 3. Where the initial response does not address the complaint, further investigation, corrective action and follow-up monitoring shall be undertaken as appropriate. The complainant [and council] will be informed of actions taken. 4. All actions will be recorded until the investigation is complete. Rp 001 R C Wrights Rd Storage Ponds (Construction noise assessment).docx Page 27 of 27