cfc group facility construction noise and vibration management … · 2019. 3. 13. · bringelly...

SLR Ref: 610.17734-R01 Version No: -v1.1 February 2019

BRINGELLY ROAD BUSINESS HUB CFC Group Facility

Construction Noise and Vibration Management Plan

Prepared for:

Commercial & Industrial Property Pty Ltd Suite 59, 26-32 Pirrama Road

PYRMONT NSW 2009

Commercial & Industrial Property Pty Ltd Bringelly Road Business Hub CFC Group Facility Construction Noise and Vibration Management Plan

SLR Ref No: 610.17734-R01-v1.1.docx February 2019

PREPARED BY

SLR Consulting Australia Pty Ltd ABN 29 001 584 612 2 Lincoln Street Lane Cove NSW 2066 Australia (PO Box 176 Lane Cove NSW 1595 Australia) T: +61 2 9427 8100 E: [email protected] www.slrconsulting.com

BASIS OF REPORT

This report has been prepared by SLR Consulting Australia Pty Ltd with all reasonable skill, care and diligence, and taking account of the timescale and resources allocated to it by agreement with Commercial & Industrial Property Pty Ltd (the Client). Information reported herein is based on the interpretation of data collected, which has been accepted in good faith as being accurate and valid.

This report is for the exclusive use of the Client. No warranties or guarantees are expressed or should be inferred by any third parties. This report may not be relied upon by other parties without written consent from SLR

SLR disclaims any responsibility to the Client and others in respect of any matters outside the agreed scope of the work.

DOCUMENT CONTROL

Reference Date Prepared Checked Authorised

610.17734-R01-v1.1 8 February 2019 David O'Brien Antony Williams Antony Williams

610.17734-R01-v1.0 6 February 2019 David O'Brien Antony Williams Antony Williams



CONTENTS

1 INTRODUCTION .......................................................................................................... 5

1.1 Project Description ........................................................................................................... 5

1.2 Sensitive Receivers............................................................................................................ 6

1.3 Development Consent and Conditions of Approval ......................................................... 6

2 EXISTING NOISE ENVIRONMENT ................................................................................ 7

2.1 Unattended Ambient Noise Monitoring ........................................................................... 7

3 ASSESSMENT CRITERIA ............................................................................................... 8

3.1 Interim Construction Noise Guideline .............................................................................. 8

3.1.1 Residential Receivers ...................................................................................................................................... 8 3.1.2 Other Sensitive Land Uses .............................................................................................................................. 9 3.1.3 Summary of NMLs .......................................................................................................................................... 9 3.1.4 Construction Road Traffic Noise ................................................................................................................... 10

3.2 Construction Vibration .................................................................................................... 10

4 CONSTRUCTION NOISE AND VIBRATION IMPACT ASSESSMENT ................................ 12

4.1 Construction Activities .................................................................................................... 12

4.1.1 Working Hours .............................................................................................................................................. 12 4.1.2 Construction Activity Source Noise Levels .................................................................................................... 12

4.2 Construction Noise Assessment ..................................................................................... 13

4.3 Construction Vibration Assessment................................................................................ 15

4.4 Construction Traffic ........................................................................................................ 15

4.5 Mitigation ....................................................................................................................... 15

4.5.1 Complaint Handling ...................................................................................................................................... 17 4.5.2 Community Consultation and Liaison ........................................................................................................... 17

DOCUMENT REFERENCES TABLES Table 1 Summary of Sensitive Receivers .................................................................................... 6 Table 2 Summary of Existing Ambient Noise Levels ................................................................... 7 Table 3 Determination of NMLs for Residential Receivers ......................................................... 8 Table 4 NMLs for Project Specific Other Sensitive Receivers ..................................................... 9 Table 5 Construction Noise Management Levels ..................................................................... 10 Table 6 RNP Criteria for Assessing Construction Traffic on Public Roads ................................. 10 Table 7 CNVG Recommended Minimum Working Distances from Vibration Intensive

Equipment .................................................................................................................... 11



CONTENTS

Table 8 Construction Activities ................................................................................................. 12 Table 9 Construction Works and Sound Power Levels for Construction Equipment ............... 13 Table 10 Predicted Daytime Construction Noise Levels ............................................................. 14 Table 11 Standard Recommended Mitigation Measures ........................................................... 16

FIGURES

Figure 1 Site Location, Nearest Sensitive Receivers and Unattended Noise Monitoring Locations ........................................................................................................................ 5

APPENDICES

Appendix A Acoustic Terminoglogy Appendix B Noise Logging Results



1 Introduction SLR Consulting Australia Pty Ltd (SLR) has been engaged by Commercial & Industrial Property Pty Ltd (CIP Property) and Charter Hall (CH) to prepare a Construction Noise and Vibration Management Plan (CNVMP) for the approved CFC Group facility, located off Skyline Crescent at the Bringelly Road Business Hub.

This CNVMP addresses the potential noise and vibration impacts associated with the construction of the project and provides details of how the potential impacts would be mitigated and managed.

This report uses specialist acoustic terminology. An explanation of common terms is provided in Appendix A.

1.1 Project Description

The CFC Group facility would be used for the sale and maintenance of construction equipment and heavy earth moving machinery. The facility comprises of three showrooms, a large warehouse space and workshop, hardstands area and wash bay. The site location is shown in Figure 1.

Figure 1 Site Location, Nearest Sensitive Receivers and Unattended Noise Monitoring Locations



1.2 Sensitive Receivers

The nearest sensitive receivers are two residential dwellings at 12 Bringelly Road, Horningsea Park located to the east of the eastern boundary. The closest of these is around 120 m away, however it is noted that this dwelling appears to be in an abandoned condition. Whilst this dwelling is not considered noise sensitive at this time, it has been included in the assessment for completeness.

Residential areas are also located further to the east at a distance of around 280 m across Cowpasture Road and around 320 m to the north across Stuart Road. The nearest receivers are shown in Figure 1 with details of the nearest potentially affected sensitive receivers in Table 1.

Table 1 Summary of Sensitive Receivers

ID Address Type Distance (m) Direction

R01 12 Bringelly Road, Horningsea Park (abandoned condition) Residential 120 m East

R02 12 Bringelly Road, Horningsea Park Residential 180 m East

R03 Properties across Cowpasture Road Residential 280 m East

R04 Properties on Stuart Road Residential 320 m North

R05 Properties on Twenty Sixth Avenue and Stuart Road Residential 450 m West

R06 6 Stuart Road (Clever Cookies Early Learning Centre) Child Care 300 m North

1.3 Development Consent and Conditions of Approval

This CNMP has been prepared with reference to Condition B26 of the development consent conditions for the CFC development. Condition B26 is reproduced below:

B26. The applicant must prepare a Construction Noise Management Plan for the development to the satisfaction of the Planning Secretary. The plan must form part of a CEMP in accordance with condition C2 and must

a. Be prepared by a suitably qualified and experienced noise expert;

b. Be approved by the planning Secretary prior to the commencement of construction of each stage of the development;

c. Describe procedures for achieving the noise management levels in EPA’s Interim Construction Noise Guideline (DECC, 2009) (as may be updated or replaced from time to time);

d. Describe the measures to be implemented to manage high noise generating works such as piling, in close proximity to sensitive receivers;

e. Include strategies that have been developed with the community for managing high noise generating works; and

f. Describe the community consultation undertaken to develop the strategies in condition B26(e).

g. Include a complaints management system that would be implemented for the duration of the development.



2 Existing Noise Environment The acoustical environment surrounding the site is generally controlled by road traffic noise from the surrounding road network, with the nearest major roads being Cowpasture Road to the east and Bringelly Road and Camden Valley Way to the south.

2.1 Unattended Ambient Noise Monitoring

Unattended noise monitoring was completed in the project area in August 2018. The measured noise levels have been used to determine the existing noise environment and to set criteria to assess the potential impacts from the project.

The monitoring equipment was located to be representative of receivers impacted by the project, within constraints such as accessibility, security and permission from land owners.

The noise monitoring equipment continuously measured existing noise levels in 15-minute periods during the daytime, evening and night-time periods for the survey period. All equipment carried current National Association of Testing Authorities (NATA) calibration certificates and the calibration was checked before and after each measurement.

The noise monitoring data has been processed to exclude noise from extraneous events and/or data affected by adverse weather conditions, such as strong wind or rain. The background noise monitoring locations are shown in Figure 1 and a summary of the results is provided in Table 2.

Table 2 Summary of Existing Ambient Noise Levels

Location Address Measured Noise Levels (dBA)

Background Noise (RBL) Average Noise (LAeq)

Day Evening Night Day Evening Night

L.01 18 Stuart Road, West Hoxton 39 36 31 53 51 48

L.02 12 Bringelly Road, Horningsea Park 46 45 37 55 53 52

L.03 Twenty Sixth Avenue and Stuart Road 44 43 39 53 54 49

An overview of each monitoring location are provided in Figure 1, logger graphs of the measured daily noise levels are in Appendix B.



3 Assessment Criteria

3.1 Interim Construction Noise Guideline

The NSW Interim Construction Noise Guideline (ICNG) is used to assess and manage impacts from construction noise on residences and other sensitive land uses in NSW.

The ICNG requires project specific Noise Management Levels (NMLs) to be established for sensitive receivers based on the existing background noise in the area.

The NMLs are not mandatory limits, however where construction noise levels are predicted or measured to be above the NMLs, feasible and reasonable work practices to minimise noise emissions are to be investigated.

3.1.1 Residential Receivers

The ICNG approach for determining NMLs at residential receivers is shown in Table 3.

Table 3 Determination of NMLs for Residential Receivers

Time of Day NML LAeq(15minute)

How to Apply

Standard hours Monday to Friday 7:00 am to 6:00 pm Saturday 8:00 am to 1:00 pm No work on Sundays or public holidays

RBL + 10 dB • The noise affected level represents the point above which there may be some community reaction to noise.

• Where the predicted or measured LAeq(15minute) is greater than the noise affected level, the proponent should apply all feasible and reasonable work practises to meet the noise affected level.

• The proponent should also inform all potentially impacted residents of the nature of works to be carried out, the expected noise levels and duration, as well as contact details.

Highly Noise Affected 75 dBA

• The Highly Noise Affected (HNA) level represents the point above which there may be strong community reaction to noise.

• Where noise is above this level, the relevant authority (consent, determining or regulatory) may require respite periods by restructuring the hours that the very noisy activities can occur, taking into account: Times identified by the community when they are less sensitive to

noise (such as before and after school for works near schools or mid-morning or mid-afternoon for works near residences.

If the community is prepared to accept a longer period of construction in exchange for restrictions on construction times.

Outside recommended standard hours

RBL + 5 dB • A strong justification would typically be required for works outside the recommended standard hours.

• The proponent should apply all feasible and reasonable work practices to meet the noise affected level.

• Where all feasible and reasonable practises have been applied and noise is more than 5 dB above the noise affected level, the proponent should negotiate with the community.

Note 1: The RBL is the Rating Background Level and the methodology for calculating it is described in the NSW Noise Policy for Industry.



Sleep Disturbance

Where construction works are planned to extend over more than two consecutive nights, the ICNG recommends that an assessment of sleep disturbance impacts should be completed.

A method for assessing sleep disturbance is contained in the EPA’s Noise Policy for Industry (NPfI). Although the NPfI sleep disturbance criteria relates to industrial noise, it is also considered relevant for reviewing potential impacts from construction noise as a screening criteria to identify the need for further assessment.

The NPfI notes that a detailed maximum noise level assessment should be undertaken where a project results in night-time noise levels which exceed:

• 52 dBA LAFmax or the prevailing background level plus 15 dB, whichever is the greater.

For this assessment, the existing background level plus 15 dB approach has been used

3.1.2 Other Sensitive Land Uses

The ICNG provides criteria for a number of non-residential ‘other sensitive’ land uses, such as educational institutes, hospitals, medical facilities and outdoor recreational areas. The ICNG references AS 2107 for criteria for other sensitive receivers which are not listed in the guideline.

The AS2107 NMLs for other sensitive receivers are shown in Table 4.

Table 4 NMLs for Project Specific Other Sensitive Receivers

Land Use NML LAeq(15minute) NML Derived From

Internal External

Childcare Centre 60 dBA play areas

70 dBA1 play areas

ICNG outdoor passive recreation

40 dBA sleeping area

50 dBA1

sleeping area AS2107 for residential sleeping areas near to major roads

Note 1: A conservative 10 dB outside-to-inside facade performance is assumed at this receiver for an open window.

3.1.3 Summary of NMLs

The NMLs for the project are determined using the background noise monitoring and are shown in Table 5.



Table 5 Construction Noise Management Levels

Receiver ID

Representative Background Monitoring Location

Noise Management Level (LAeq(15minute) – dBA) Sleep Disturbance Screening Criteria (RBL +15 dB)

Standard Construction (RBL +10 dB)

Out of Hours (RBL +5 dB)

Daytime Daytime1 Evening Night-time

R01 L.02 56 n/a n/a n/a n/a R02 L.02 56 n/a n/a n/a n/a R03 L.02 56 n/a n/a n/a n/a R04 L.01 49 n/a n/a n/a n/a R05 L.03 54 n/a n/a n/a n/a R06 L.01 70 (play areas)

n/a n/a n/a n/a 50 (sleeping areas) n/a n/a n/a 542

Note 1: This refers to the period on Saturday between 7am – 8am and 1pm – 6pm, on Sunday and public holidays between 8am – 6pm.

Note 2: This receiver is a childcare centre. The sleep disturbance is based off the day-time RBL for potential impact during sleep-time periods of the day.

3.1.4 Construction Road Traffic Noise

The potential impacts from construction traffic on public roads are assessed under the NSW EPA Road Noise Policy (RNP)).

An initial screening test is first applied to evaluate if noise levels due to construction traffic are expected to increase by more than 2 dB. Where this is considered likely further assessment is required using the RNP base criteria shown in Table 6.

Table 6 RNP Criteria for Assessing Construction Traffic on Public Roads

Road Category Type of Project/Land Use Assessment Criteria (dBA)

Daytime (7 am - 10 pm)

Night-time (10 pm - 7 am)

Freeway/ arterial/ sub-arterial roads

Existing residences affected by additional traffic on existing freeways/arterial/sub-arterial roads generated by land use developments

LAeq(15hour) 60 (external)


Local roads Existing residences affected by additional traffic on existing local roads generated by land use developments



3.2 Construction Vibration

Minimum working distances for typical vibration intensive construction equipment are provided in Table 7.

The minimum working distances are quoted for both cosmetic damage (see BS 7385 Part 2-1993 Evaluation and measurement for vibration in buildings Part 2, BSI, 1993) and human comfort (see the NSW DEC Assessing Vibration: A Technical Guideline, 2006) and are based on empirical data which suggests that where works are further from receivers than the quoted minimum distances then impacts are not considered likely.



Table 7 CNVG Recommended Minimum Working Distances from Vibration Intensive Equipment

Plant Item Rating/Description Minimum Distance

Cosmetic Damage (BS 7385)

Human Response (NSW EPA Guideline)

Vibratory Roller 1-2 tonne 5 m 15 m to 20 m

2-4 tonne 6 m 20 m

4-6 tonne 12 m 40 m

7-13 tonne 15 m 100 m

13-18 tonne 20 m 100 m

>18 tonne 25 m 100 m

Small Hydraulic Hammer 300 kg (5 to 12 t excavator) 2 m 7 m

Medium Hydraulic Hammer 900 kg (12 to 18 t excavator) 7 m 23 m

Large Hydraulic Hammer 1,600 kg (18 to 34 t excavator) 22 m 73 m

Piling Rig – Bored ≤ 800 mm 2 m (nominal) 4 m

Jackhammer Hand held 1 m (nominal) 2 m

Note 1: Taken from the Roads and Maritime Construction Noise and Vibration Guideline.

Note 2: More stringent conditions may apply to heritage or other sensitive structures.

The minimum working distances are indicative and would vary depending on the particular item of equipment and local geotechnical conditions. The distances apply to cosmetic damage of typical buildings under typical geotechnical conditions.



4 Construction Noise and Vibration Impact Assessment

4.1 Construction Activities

The activities likely to be required to build the project involve conventional construction equipment such as ground excavation equipment, mobile cranes, delivery trucks and trade equipment.

A number of representative construction scenarios have been developed to assess potential impacts during construction are detailed in Table 8.

Table 8 Construction Activities

Works ID Scenario Working Hours

Standard Daytime

Day OOH1

Evening Night-time

W.001 Site Establishment - - -

W.002 Ground Works - - -

W.003 Structural Works - - -

W.004 Service Installation - - -

W.005 Finishing Trades - - -

Note 1: OOH = Out of hours. During the daytime this refers to the period on Saturday between 7am – 8am and 1pm – 6pm, on Sunday and public holidays between 8am – 6pm.

4.1.1 Working Hours

The works would be undertaken during the standard construction hours of:

• 7.00 am to 6.00 pm Monday to Friday

• 8.00 am to 1.00 pm on Saturdays

• No work on Public Holidays or Sundays.

It is not expected that there would be any requirement for works during evening or night-time periods.

4.1.2 Construction Activity Source Noise Levels

The assessment uses ‘realistic worst-case’ scenarios to determine the impacts from the noisiest 15-minute period that is likely to occur for each work scenario, as required by the ICNG. Sound power levels for the construction equipment used in the modelling are listed in Table 9.



Table 9 Construction Works and Sound Power Levels for Construction Equipment

Works ID

Scenario Sound Power Level (Leq dBA)

Conc

rete

Mix

er T

ruck

Conc

rete

Pum

p

22 T

Exc

avat

or

Gen

erat

or

Gra

der

4” G

rinde

r

Ham

mer

Dril

l

Hand

Too

ls

Mob

ile C

rane

Fra

nna

Mob

ile C

rane

100

T

Rolle

r – S

moo

th D

rum

Truc

k

103 106 99 102 108 98 100 94 98 100 107 107

W.001 Site Establishment X X

W.002 Ground Works X X X X X

W.003 Structural Works X X X X X X X

W.004 Service Installation X X X X X

W.005 Finishing Trades X X X X X

Note 1: The ICNG requires that activities identified as particularly annoying (such as jackhammering, rock breaking and power saw operation) have a 5 dB ‘penalty’ added to predicted noise levels when using the quantitative method.

Note 2: Sound Power Levels have been taken from DEFRA, RMS Construction Noise and Vibration Guideline and TfNSW Construction Noise and Vibration Strategy.

4.2 Construction Noise Assessment

Noise predictions from the construction works have been predicted to the nearest receivers during the daytime and are summarised in Table 10.

The results represent the worst-case noise levels where all equipment in each scenario is working concurrently. For most construction activities, it is expected that the construction noise levels would frequently be lower than predicted.



Table 10 Predicted Daytime Construction Noise Levels

Construction Scenario

Receiver / NCA Noise Level LAeq(15minute) (dBA)

Daytime NML Predicted Level Exceedance

W.001 Site Establishment

R01 (12 Bringelly Road – Abandoned Condition)1 56 50 -

R02 (12 Bringelly Road) 47 -

R03 (Properties along Cowpasture Road) 43 -

R04 (Properties along Stuart Road) 49 42 -

R05 (West of development) 54 39 -

R06 (Clever Cookies Child Care) 70 (play areas) 41 -

50 (sleeping ) 41 -

W.002 Ground Works

R01 (12 Bringelly Road – Abandoned Condition) 56 57 1






50 (sleeping ) 48 -

W.003 Structural Works

R01 (12 Bringelly Road – Abandoned Condition) 56 54 -






50 (sleeping ) 45 -

W.004 Service Installation







50 (sleeping ) 41 -



Construction Scenario

Receiver / NCA Noise Level LAeq(15minute) (dBA)

Daytime NML Predicted Level Exceedance

W.005 Finishing Trades







50 (sleeping ) 37 -

Note 1: Receiver not considered noise sensitive.

The above shows the following:

• The noise levels from construction of the project are predicted to be compliant with criteria at all habited receivers. This is due to the distance of the receivers from the works and the relatively high existing background levels.

• The currently abandoned building located at 12 Bringelly Road (R01) is however predicted to exceed the NML by 1 dB. This is considered minor and no further action is required.

4.3 Construction Vibration Assessment

The major potential sources of vibration from the proposed construction activities would likely be during earthworks. As receivers at site are over 100 m away, the works would be outside of the minimum working distances shown in Table 7 meaning the risk of cosmetic damage or human comfort vibration impacts is low.

Should works be required within the safe working distances, vibration monitoring should be undertaken to confirm that the level of vibration is within acceptable tolerances.

4.4 Construction Traffic

The requirements for construction traffic accessing the site would be minimal and would not be expected to result in any additional noise impacts at the nearest receivers due to the roads in the area being major routes with high existing volumes of traffic.

4.5 Mitigation

While the works are predicted to be compliant with the noise goals, it is recommended that the contractor adopt best-practice mitigation measures, where possible.

The recommended construction mitigation measures are shown in Table 11.



Table 11 Standard Recommended Mitigation Measures

Project stage Measure

Scheduling Where ever possible, highly noisy intensive works should only be undertaken during the following hours, unless otherwise assessed and justified:

- 7 am to 6 pm Mondays to Fridays, inclusive; and - 8 am to 1 pm Saturdays; and - at no time on Sundays or public holidays.

Provide respite periods when noisy works are undertaken outside standard hours of construction or during periods where high noise impacts are likely.

Carry out community consultation to determine the need and frequency of respite periods, if necessary.

Avoid loading and unloading of materials / deliveries outside of daytime hours.

Site Layout

Site entry and exit points should be located as far as possible from sensitive receivers.

Compounds and work areas should be designed to as one-way to minimise the need for vehicles to reverse.

Work compounds, parking areas, equipment and stockpiles should be positioned away from noise-sensitive locations and/or in shielded locations.

Trucks should not idle near to residential receivers.

Stationary sources of noise, such as generators, should be located away from sensitive receivers.

Contractor management

Training should be provided to project personnel, including relevant sub-contractors, on noise and vibration requirements and the location of sensitive receivers during inductions and toolbox talks.

Delivery vehicles should be fitted with straps rather than chains for unloading, wherever possible.

Truck drivers should avoid compression braking as far as practicable.

Where night-time works are required, trucks should use broadband reversing alarms.

Noise source mitigation

Use the minimum sized equipment necessary to complete the work and where possible, use alternative, low-impact construction techniques.

Power tools should use mains power where possible rather than generators.

Shut down machinery, including generators, when not in operation.

Avoid dropping materials from a height and dampen or line metal trays, as necessary.

Ensure equipment is operated in the correct manner.

All equipment should be appropriately maintained and fitted with noise control devices, where practicable, including acoustic lining of engine bays and air intake / discharge silencers, etc.

Where possible, use dampened ‘city’ bits on jackhammers and rockbreakers.

Community consultation

Provide appropriate notice on the Bringelly Road Business Hub website prior to starting works.

Provide signage with a 24 hour contact number.

Where there are complaints regarding noise, review and implement additional control measures, where feasible and reasonable.

Monitoring

Conduct noise and/or vibration monitoring in response to any valid complaints received.

Where vibration intensive works are within the minimum working distances, vibration monitoring should be completed in the early stages of the project to verify the levels.



4.5.1 Complaint Handling

The construction contractor will adopt the following protocol for handling complaints. This protocol is intended to ensure that the issues are addressed and that appropriate corrective action is identified and implemented as necessary:

• The construction contractor will record all verbal and telephone complaints in writing and will forward all complaints to the Project Manager, together with details of the circumstance leading to the complaint and all subsequent actions.

• The Project Manager will investigate the complaint in order to determine whether an exceedance of the appropriate criteria has occurred.

• If excessive noise and/or vibration impacts have been caused, corrective action will be planned and implemented by the contractor

• Complainants will be told by the Project Manager that their complaint is being addressed, and that corrective action is being taken, where necessary.

• Follow up monitoring or other investigations will be carried out by the Project Manager and the construction contractor, as needed, to confirm the effectiveness of the corrective action.

• Complainants will be informed of the corrective action taken to mitigate the adverse impacts.

4.5.2 Community Consultation and Liaison

Community consultation will be undertaken by the construction contractor where necessary, including:

• Advising the community of work to be undertaken through the BRBH website.

• Recording and managing any complaints.

These and other elements of the community consultation will be addressed in accordance with condition C18 “Access to information” under the CFC Development Consent for the subject works.

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APPENDIX A Acoustic Terminology

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1 Sound Level or Noise Level

The terms ‘sound’ and ‘noise’ are almost interchangeable, except that in common usage ‘noise’ is often used to refer to unwanted sound.

Sound (or noise) consists of minute fluctuations in atmospheric pressure capable of evoking the sense of hearing. The human ear responds to changes in sound pressure over a very wide range. The loudest sound pressure to which the human ear responds is ten million times greater than the softest. The decibel (abbreviated as dB) scale reduces this ratio to a more manageable size by the use of logarithms.

The symbols SPL, L or LP are commonly used to represent Sound Pressure Level. The symbol LA represents A-weighted Sound Pressure Level. The standard reference unit for Sound Pressure Levels expressed in decibels is 2 x 10-5 Pa.

2 ‘A’ Weighted Sound Pressure Level

The overall level of a sound is usually expressed in terms of dBA, which is measured using a sound level meter with an ‘A-weighting’ filter. This is an electronic filter having a frequency response corresponding approximately to that of human hearing.

People’s hearing is most sensitive to sounds at mid frequencies (500 Hz to 4000 Hz), and less sensitive at lower and higher frequencies. Thus, the level of a sound in dBA is a good measure of the loudness of that sound. Different sources having the same dBA level generally sound about equally loud.

A change of 1 dBA or 2 dBA in the level of a sound is difficult for most people to detect, whilst a 3 dBA to 5 dBA change corresponds to a small but noticeable change in loudness. A 10 dBA change corresponds to an approximate doubling or halving in loudness. The table below lists examples of typical noise levels

Sound Pressure Level (dBA

Typical Source

Subjective Evaluation

130 Threshold of pain Intolerable

120 Heavy rock concert Extremely noisy

110 Grinding on steel

100 Loud car horn at 3 m Very noisy

90 Construction site with pneumatic hammering

80 Kerbside of busy street Loud

70 Loud radio or television

60 Department store Moderate to quiet

50 General Office

40 Inside private office Quiet to very quiet

30 Inside bedroom

20 Recording studio Almost silent

Other weightings (eg B, C and D) are less commonly used than A-weighting. Sound Levels measured without any weighting are referred to as ‘linear’, and the units are expressed as dB(lin) or dB.

3 Sound Power Level

The Sound Power of a source is the rate at which it emits acoustic energy. As with Sound Pressure Levels, Sound Power Levels are expressed in decibel units (dB or dBA), but may be identified by the symbols SWL or LW, or by the reference unit 10-12 W.

The relationship between Sound Power and Sound Pressure may be likened to an electric radiator, which is characterised by a power rating, but has an effect on the surrounding environment that can be measured in terms of a different parameter, temperature.

4 Statistical Noise Levels

Sounds that vary in level over time, such as road traffic noise and most community noise, are commonly described in terms of the statistical exceedance levels LAN, where LAN is the A-weighted sound pressure level exceeded for N% of a given measurement period. For example, the LA1 is the noise level exceeded for 1% of the time, LA10 the noise exceeded for 10% of the time, and so on.

The following figure presents a hypothetical 15 minute noise survey, illustrating various common statistical indices of interest.

Of particular relevance, are:

LA1 The noise level exceeded for 1% of the 15 minute interval.

LA10 The noise level exceed for 10% of the 15 minute interval. This is commonly referred to as the average maximum noise level.

LA90 The noise level exceeded for 90% of the sample period. This noise level is described as the average minimum background sound level (in the absence of the source under consideration), or simply the background level.

LAeq The A-weighted equivalent noise level (basically the average noise level). It is defined as the steady sound level that contains the same amount of acoustical energy as the corresponding time-varying sound.

When dealing with numerous days of statistical noise data, it is sometimes necessary to define the typical noise levels at a given monitoring location for a particular time of day. A standardised method is available for determining these representative levels.

This method produces a level representing the ‘repeatable minimum’ LA90 noise level over the daytime and night-time measurement periods, as required by the EPA. In addition the method produces mean or ‘average’ levels representative of the other descriptors (LAeq, LA10, etc).

5 Tonality

Tonal noise contains one or more prominent tones (ie distinct frequency components), and is normally regarded as more offensive than ‘broad band’ noise.

6 Impulsiveness

An impulsive noise is characterised by one or more short sharp peaks in the time domain, such as occurs during hammering.

7 Frequency Analysis

Frequency analysis is the process used to examine the tones (or frequency components) which make up the overall noise or vibration signal. This analysis was traditionally carried out using analogue electronic filters, but is now normally carried out using Fast Fourier Transform (FFT) analysers.

The units for frequency are Hertz (Hz), which represent the number of cycles per second.

Frequency analysis can be in:

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• Octave bands (where the centre frequency and width of each band is double the previous band)

• 1/3 octave bands (3 bands in each octave band)

• Narrow band (where the spectrum is divided into 400 or more bands of equal width)

The following figure shows a 1/3 octave band frequency analysis where the noise is dominated by the 200 Hz band. Note that the indicated level of each individual band is less than the overall level, which is the logarithmic sum of the bands.

8 Vibration

Vibration may be defined as cyclic or transient motion. This motion can be measured in terms of its displacement, velocity or acceleration. Most assessments of human response to vibration or the risk of damage to buildings use measurements of vibration velocity. These may be expressed in terms of ‘peak’ velocity or ‘rms’ velocity.

The former is the maximum instantaneous velocity, without any averaging, and is sometimes referred to as ‘peak particle velocity’, or PPV. The latter incorporates ‘root mean squared’ averaging over some defined time period.

Vibration measurements may be carried out in a single axis or alternatively as triaxial measurements. Where triaxial measurements are used, the axes are commonly designated vertical, longitudinal (aligned toward the source) and transverse.

The common units for velocity are millimetres per second (mm/s). As with noise, decibel units can also be used, in which case the reference level should always be stated. A vibration level V, expressed in mm/s can be converted to decibels by the formula 20 log (V/Vo), where Vo is the reference level (10-9 m/s). Care is required in this regard, as other reference levels may be used by some organizations.

9 Human Perception of Vibration

People are able to ‘feel’ vibration at levels lower than those required to cause even superficial damage to the most susceptible classes of building (even though they may not be disturbed by the motion). An individual's perception of motion or response to vibration depends very strongly on previous experience and expectations, and on other connotations associated with the perceived source of the vibration. For example, the vibration that a person responds to as ‘normal’ in a car, bus or train is considerably higher than what is perceived as ‘normal’ in a shop, office or dwelling.

10 Over-Pressure

The term ‘over-pressure’ is used to describe the air pressure pulse emitted during blasting or similar events. The peak level of an event is normally measured using a microphone in the same manner as linear noise (ie unweighted), at frequencies both in and below the audible range.

11 Ground-borne Noise, Structure-borne Noise and Regenerated Noise

Noise that propagates through a structure as vibration and is radiated by vibrating wall and floor surfaces is termed ‘structure-borne noise’, ‘ground-borne noise’ or ‘regenerated noise’. This noise originates as vibration and propagates between the source and receiver through the ground and/or building structural elements, rather than through the air.

Typical sources of ground-borne or structure-borne noise include tunnelling works, underground railways, excavation plant (eg rockbreakers), and building services plant (eg fans, compressors and generators).

The following figure presents the various paths by which vibration and ground-borne noise may be transmitted between a source and receiver for construction activities occurring within a tunnel.

The term ‘regenerated noise’ is also used in other instances where energy is converted to noise away from the primary source. One example would be a fan blowing air through a discharge grill. The fan is the energy source and primary noise source. Additional noise may be created by the aerodynamic effect of the discharge grill in the airstream. This secondary noise is referred to as regenerated noise

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APPENDIX B Noise Logging Results

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