Report No 3773R3 26 May 2017 · 2018-08-08 · 1 20/04/2017 Report GR MT 2 04/05/2017 Revision to...

No is e Asses sme nt Re por t

Propo se d E xtrac t i ve I nd u s try Rocky Gu l l y Roa d

Coomi nya, QL D 4 311 (Lot 23 6 o n SP26 013 8; Lot 246 on C A31 773 ;

Lot 22 0 on SP25 079 2 a n d Lots 225 -22 6 on C A3 164 1)

Repor t No 37 73 R3 26 t h May 20 17

P h : ( 0 7 ) 3 3 5 5 9 7 0 7 F a x : ( 0 7 ) 3 3 5 5 7 2 1 0

E m a i l : i n f o @ n o i s em ea s u rem en t . c o m . a u

N o i s e M ea s u r em en t S er v i c es P ty L td 1 8 L a d e S t re et , G a y th o rn e Q L D 4 0 5 1 P O B o x 2 1 2 7 , Br o o ks id e C en t re Q L D 4 0 5 3

Noise Assessment Report – Proposed Extractive Industry – Rocky Gully Road, Coominya

Noise Measurement Services Pty Ltd Report 3773R3 26th May 2017

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DOCUMENT CONTROL PAGE

NOISE MEASUREMENT SERVICES

NOISE MEASUREMENT SERVICES PTY LTD 18 Lade Street, Gaythorne QLD 4051 Telephone: (07) 3355 9707 PO Box 2127 Facsimile: (07) 3355 7210 Brookside Centre, QLD 4053 E-mail: [email protected]

Copy No_________

Revision No Issue Date Revision Description Written By Checked By

0 16/01/2017 Draft Report for Consideration GR -

1 20/04/2017 Report GR MT

2 04/05/2017 Revision to comments GR MT

3 26/05/2017 Revision to comments GR MT

Copy No(s) Rev No Destination

1 pdf 3 Zanows’ Concrete and Quarries Pty Ltd

2 3 Noise Measurement Services

3 pdf 3 Diane Kerr

REPORT FOR Zanows’ Concrete and Quarries Pty Ltd

CONTACT Darren Zanow

Signed

Max Thorne (Director) DISCLAIMER This Report by Noise Measurement Services Pty Ltd is prepared for a particular Client and is based on the agreed objective, scope, conditions and limitations as may be stated in the Executive summary. The Report presents only the information that Noise Measurement Services Pty Ltd believes, in its professional opinion, is relevant and necessary to describe the issues involved. The Report should not be used for anything other than the intended purpose and should not be reproduced, presented or reviewed except in full. The intellectual property of this Report remains with Noise Measurement Services Pty Ltd. The Client is authorised, upon payment to Noise Measurement Services Pty Ltd of the agreed Report preparation fee, to provide this Report in full to any third party.

mailto:[email protected]



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Contents

Contents ................................................................................................................ 3

Executive Summary ........................................................................................................ 4

Conclusions .......................................................................................................................................... 4

Recommendations ............................................................................................................................... 4

1. Introduction .............................................................................................................. 5

1.1 Project Location ..................................................................................................................... 5

1.2 Sensitive Receptors ................................................................................................................ 7

2. Background Noise Measurement ............................................................................. 8

2.1 Measurement Location and Equipment................................................................................. 8

2.2 Unattended monitoring results .............................................................................................. 9

3. Noise Assessment Criteria ...................................................................................... 11

3.1 Somerset Planning Scheme – 9.1.7 – Extractive Industry Code ........................................... 11

3.2 Environmental Protection (Noise) Policy 2008 .................................................................... 12

3.3 DEHP – Guideline - Planning for Noise Control 2016 ........................................................... 13 3.3.1 Control and Prevention of Background Noise Creep ............................................................................................... 13

3.3.2 Determination of Planning Noise Levels .................................................................................................................. 14

3.3.3 Specific Noise Level .................................................................................................................................................. 15

3.3.4 Determination of Maximum Noise Levels for Sleep Disturbance............................................................................. 15

4. Noise Impact Assessment ....................................................................................... 16

4.1 Somerset Planning Scheme 2016 – Extractive Industries Code ........................................... 16

4.2 DEHP Planning for Noise Control 2016 ................................................................................ 17 4.2.1 Background Noise Immission Planning Levels (min L90, 1hr) ....................................................................................... 17

4.2.2 Planning Noise Levels (LAeq, 1hr) ................................................................................................................................. 17

4.2.3 Specific Noise Level/ Component Level (LAeq, 1hr) ...................................................................................................... 18

4.3 Criteria Summary ................................................................................................................. 18

4.4 Environmental Noise Model................................................................................................. 19 4.4.1 Noise Emission Forecasts – Northern Extraction Area ............................................................................................. 20

4.4.2 Noise Emission Forecasts – South-Western Extraction Area ................................................................................... 23

4.4.3 Noise Emission Forecasts – South-Eastern Extraction Area ..................................................................................... 26

Appendix A: Plans...................................................................................................... 30

Appendix B: Environmental Noise Model ................................................................. 34

B1 Noise Source Levels .............................................................................................................. 34

B2 Meteorology ......................................................................................................................... 34

B3 Noise Model Contours ......................................................................................................... 36

Appendix C: Noise Source Measurements ............................................................... 39

Appendix D: Glossary ................................................................................................ 42



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Executive Summary This Report is in response to a request from Zanows’ Concrete and Quarries Pty Ltd for a noise assessment report

on a proposed Extractive Industry at Rocky Gully Road, Coominya (Lot 236 on SP260138; Lot 246 on CA31773; Lot

220 on SP250792 and Lots 225-226 on CA31641). The proposal is to undertake activities for the extraction and

processing of construction materials. Noise emissions from expected activities have been calculated to the nearest

residential receivers and assessed with reference to the following policy documents and standards:

• Somerset Planning Scheme 2016 – Extractive Industries Code

• Environmental Protection Act 1994

• Department of Environment and Heritage Protection – Guideline - Planning for Noise Control 2016

• Environmental Protection (Noise) Policy 2008

• Australian Standard AS1055.1:1997 – Acoustics: Description and measurement of environmental noise

Conclusions

• The proposed development can achieve the acoustic requirements of the Somerset Planning Scheme 2016.

• Extraction activities will vary in location during the life span of the development. Activities are forecast to

generally meet the Guideline - Planning for noise control and Environmental Protection (Noise) Policy 2008

criteria during the daytime period.

• Activities at the northern and south-western extraction areas are forecast to meet all criteria during the

daytime period.

• Activities at the south-eastern corner of the extraction area have been given particular consideration, with

potential exceedances at the two closest sensitive uses. A ‘set-back zone’ has been calculated, as set out in

Section 4, and noise mitigation is recommended for activities within this zone.

• During activities within this ‘set-back’ zone, noise emissions can be effectively mitigated through screening

from 4.5m (or higher) acoustic barriers. This screening may be naturally generated through extraction

benched 4.5m below natural ground height, or may be constructed through temporary earth bunds or

equivalent.

• Including screening from 4.5m noise barriers during extraction within the set-back zone, activities are

forecast to meet criteria at all sensitive uses during the daytime period.

• Subject to the considerations and recommendations as outlined in this Report, it is the opinion of this

consultancy that the proposed development can meet the requirements of Somerset Regional Council, of

the Department of Environment and Heritage Protection, and be otherwise compliant with relevant

statutory requirements.

Recommendations

It is recommended that –

• Extraction activities be limited to the daytime (7am to 6pm) period. It is understood that preparatory

activity – including vehicle movement and maintenance – will commence on site from 6am, although such

activity is expected to occur primarily at the operational areas, and generate minor noise impacts.

• Screening to an effective height of 4.5m be provided to extractive activities in the set-back zone, as

discussed in Section 4.4.3. Detailed screening calculations can be conducted when extraction reaches the

setback zone, to take account of specific ground conditions and extraction plans.



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1. Introduction

1.1 Project Location

This Report is in response to a request from Zanows’ Concrete and Quarries Pty Ltd for a noise assessment report

on a proposed Extractive Industry at Rocky Gully Road, Coominya (Lot 236 on SP260138; Lot 246 on CA31773; Lot

220 on SP250792 and Lots 225-226 on CA31641). The proposal is to undertake activities for the extraction and

processing of construction materials. Noise emissions from expected activities have been calculated to the nearest

residential receivers and assessed with reference to the following policy documents and standards:

• Somerset Planning Scheme 2016 – Extractive Industries Code

• Environmental Protection Act 1994

• Department of Environment and Heritage Protection – Guideline - Planning for Noise Control 2016

• Environmental Protection (Noise) Policy 2008

• Australian Standard AS1055.1:1997 – Acoustics: Description and measurement of environmental noise

Nominal hours of operation are 6am to 6pm Monday to Friday, and 6am to 3pm Saturday. “Soft start” operation is

proposed, with extraction commencing at 7am, and other activities (such as access, maintenance and preliminary

checks) occurring between 6am and 7am. The development site and locale are presented in the following plates.

Terms and definitions used in this Report are presented in Appendix C.

Plate 1: Showing the development site (in blue) and locale (source: Google, Queensland Government)



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Plate 2: Showing the development site plan (source: Zanows’ Concrete and Quarries Pty Ltd)



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1.2 Sensitive Receptors

Fifteen existing buildings have been identified as the most potentially affected by noise from proposed

activities. Although it is unclear whether all of these receivers are currently inhabited, it is conservatively

assumed that these uses are noise sensitive. The receivers are referred to as R1 to R15 in this Report, and are

presented in Plate 3 and Table 1 below.

Plate 3: Showing receivers R1 to R15

Table 1: Receivers by coordinates (Universal Transverse Mercator)

Receiver Easting (UTM) Southing (UTM)

R1 447454 6967390

R2 447119 6967360

R3 446970 6966819

R4 445967 6967012

R5 445639 6967376

R6 445035 6967525

R7 445099 6968210

R8 444671 6968719

R9 444706 6969438

R10 445325 6969689

R11 446311 6970169

R12 446961 6970336

R13 448139 6969968

R14 448790 6968638

R15 448752 6968364



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2. Background Noise Measurement

2.1 Measurement Location and Equipment

To assess the existing acoustic environment at the proposed development site, an ambient noise survey was

conducted during a period of no on-site activity. An environmental noise logger was installed at a

measurement location referred to as ML1 in this Report. ML1 was located on the western boundary at the

approximate mid-point of Lot 246. The microphone was at a height of 1.4m and is considered free-field. The

location of ML1 is presented below.

Plate 4: Showing location ML1

Photo 1: Showing location ML1 (source: NMS)

The operation of the sound level measuring equipment was field calibrated before and after each

measurement session and no significant drift from the reference signal was observed. All instrumentation used

in this assessment hold a current calibration certificate from a certified NATA calibration laboratory. The

following instruments were used to measure the ambient noise levels-

• Larson Davis 831 type 1 environmental noise logger

• 1 x Quest CA-22 calibrator



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2.2 Unattended monitoring results

Ambient sound pressure levels were measured generally in accordance with Australian Standard

AS1055.1:1997 - Acoustics-Description and measurement of environmental noise - Part 1: General procedures.

Ambient noise levels were recorded at 15 minute intervals between the 13th and the 19th of October 2016.

Average levels are presented graphically in Figure 1 below, and in tabular form in Table 2 below.

Figure 1: Average measured noise levels at ML1. Levels are in dB(A), free-field



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Table 2: Averaged measured noise levels at ML1. Levels are in dB(A), free-field

Day Date Period L01 L10 L90 Leq

Thursday 13th

October

7:00am – 6:00pm 64.8 53.0 42.9 46.5

6.00pm – 10:00pm 56.2 44.5 37.3 44.6

10:00pm – 7.00am - - - -

Friday 14th

October

9:00am – 6:00pm 65.3 49.9 39.2 50.0

6.00pm – 10:00pm 48.1 35.7 29.1 40.4

10:00pm – 9.00am 58.9 35.1 25.7 41.1

Saturday 15th

October

7:00am – 6:00pm 63.3 45.9 33.6 46.9

6.00pm – 10:00pm 49.3 36.6 29.5 37.0

10:00pm – 7.00am 52.8 32.0 22.2 37.5

Sunday 16th

October

7:00am – 6:00pm 61.2 50.0 38.4 49.1

6.00pm – 10:00pm 48.1 39.5 33.0 39.2

10:00pm – 7.00am 52.2 32.7 23.8 39.2

Monday 17th

October

7:00am – 6:00pm 64.4 51.9 39.6 54.3

6.00pm – 10:00pm 54.6 42.0 34.7 42.5

10:00pm – 7.00am 62.0 38.3 23.5 44.1

Tuesday 18th

October

7:00am – 6:00pm 60.8 39.8 29.1 44.6

6.00pm – 10:00pm 52.7 40.3 33.5 41.1

10:00pm – 7.00am 56.0 37.8 29.5 40.9

Wednesday 19th

October

7:00am – 6:00pm 62.8 45.5 33.8 47.4

6.00pm – 10:00pm 53.1 41.2 35.1 41.5

10:00pm – 7.00am 56.8 35.9 24.4 44.7

Arithmetic Average

Day 63 48 37 48

Evening 52 40 33 41

Night 56 35 25 41

The levels presented above include noise measured from all sources in the locale, including sporadic traffic,

meteorology and wildlife. Measured levels are considered to be consistent with a generally quiet rural

environment, and no specific controlling noise source(s) were observed during site surveys. Levels measured at

ML1 are considered representative of the locale generally in the absence of specific activity.

Rating background levels (RBL) were calculated in accordance with the Guideline - Planning for Noise Control, and

are presented in Table 3 below.

Table 3: Rating Background Levels (RBL)

Day Evening Night

ML1 33 32 25*

* Measured night time levels were below the 25 dB(A) threshold as specified in the Guideline - Planning for Noise Control. Consequently, the 25 dB(A) threshold limit has been applied.



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3. Noise Assessment Criteria

3.1 Somerset Planning Scheme – 9.1.7 – Extractive Industry Code

Part 9.1.7 of the Somerset Planning Scheme (Extractive industry code) contains guidance to the assessment of

noise impacts from the proposed development, as reproduced (in part) below.

Table 4: Somerset Planning Scheme – Extractive Industry Code (in part)

Performance Outcomes Acceptable Outcomes

Separation Distances

PO1

The effects of extractive industry operations (dust, air and

noise emissions, blasting, vibration and overpressure) and

from associated transport movements do not create

significant environmental harm, unreasonably disrupt the

amenity of nearby sensitive land uses, or detract from the

significance of protected areas.

AO1.2

Extractive industry operations that do not

involve blasting and/or crushing of rock

(namely sand, gravel, clay and soil extraction)

are located:

(a) a minimum of 200 metres from a sensitive

land use excluding a dwelling(s) on land

that is the subject of the extractive

industry; or

(b) land in a General residential zone, General

residential zone – park residential precinct

or Rural residential zone.

AO1.3

External haul routes, other than a State-

controlled road or transport route identified on

OM006a-b, are located not less than 100

metres from a sensitive land use (not

associated with the subject site) or land in a

General residential zone, General residential

zone - park residential precinct, or Rural

residential zone.

Managing the effects of extractive industry operations

PO7

Noise and vibration is managed in accordance with accepted

standards

AO7.2

Extraction, crushing, screening loading and the

operation of plant equipment and haulage are

only undertaken between the hours of:

(a) 6.00am and 6.00pm Monday to

Friday; and

(b) 8.00am and 3.00pm on Saturdays.



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3.2 Environmental Protection (Noise) Policy 2008

The Environmental Protection (Noise) Policy 2008 establishes new acoustic quality objectives to protect or

enhance stated environmental values. The environmental values to be enhanced or protected under the policy

are the qualities of the:

• Acoustic environment that are conducive to protecting the health and biodiversity of ecosystems;

• Acoustic environment that are conducive to human health and well-being, including ensuring a

suitable acoustic environment for individuals to sleep, study and learn, to be involved in recreation

including relaxation and conversation;

• Acoustic environment that are conducive to protecting the amenity of the community.

The acoustic quality objectives do not apply to noise from aircraft movement, noise from the ordinary use of a

public road or State-controlled road and noise from the ordinary use of a busway, light rail or rail transport

infrastructure. The observations for this Report indicate that the proposed use creates noise that may

potentially impact the nearby residences. Therefore, the policy objectives to protect or enhance environmental

values for an individual (presented in Table 5 below) can apply to this development. Assuming 5 dB(A) of

attenuation from transmission through an open window, internal criteria are more stringent than outdoor

criteria.

Table 5: Acoustic Quality Objectives

Type of Occupancy / Activity Recommended Acoustic Quality Objective

RESIDENTIAL BUILDINGS

Room Category LAeq,adj,1hr LA10,adj,1hr LA01,adj,1hr

Dwelling, outdoors, daytime & evening

Dwelling, indoors, daytime & evening

Dwelling, indoors, night-time

50

35

30

55

40

35

65

45

40

In addition, noise emissions from on-site activities should, where reasonable to do so, comply with Section 10

Controlling Background Creep of the Environmental Protection (Noise) Policy 2008 as described in Table 6.

Table 6: Controlling background creep criteria

Continuous Noise (measured by LA90, T) Non-continuous noise or noise that varies over time

(measured by LAeq, adj, T)

To the extent that it is reasonable to do so noise from

the activity must not be more than nil dB(A) greater

than the existing acoustic environment measured by

LA90,T.

To the extent that it is reasonable to do so noise from

the activity must not be more than 5 dB(A) greater

than the existing acoustic environment measured by

LA90,T.



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3.3 DEHP – Guideline - Planning for Noise Control 2016

3.3.1 Control and Prevention of Background Noise Creep

To prevent background noise levels from progressively creeping higher over time with the establishment of

new development in an area, the Guideline recommends that the minimum LA90, 1hour outdoor background noise

planning levels given in Table 7 not be exceeded. A correction is then made in accordance with the range of

expectations for the locality set out in Table 8.

Table 7: Recommended outdoor background noise planning levels (in terms of min LA90, 1hour).

Receiver Land Use Receiver Area Dominant Land Use

(description of neighbourhood) see Note 1

Background noise level,

min L90, 1hour dB(A) see Note 2

Time

Day Evening Night

Purely residential

Very Rural 35 30 25

Rural residential, church, hospital 40 35 30

Shop or commercial office 45 40 35

Light industry 50 45 40

Residential area on busy road or near an industrial area or commercial area

Residential, church, hospital, school 45 40 35


Light industry 55 50 45

Industrial area

Residential, church, hospital, school 50 45 40


Factory office of factory 60 60 60

Passive recreation area Picnic grounds, public beaches, bush

walks, public gardens, etc 35 35 35

Note 1: the dominant land use is defined by a radius of 200m from the receiver location under consideration

Note 2: minLA90,1hour is defined in the glossary of terms as the rating background level (RBL) and an example of its calculation

is given in the Guideline.



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Table 8: Recommended noise immission planning levels (min LA90,1hour) for developments.

Existing background noise level at the most

sensitive point in an affected residential area

Recommended LA90,1hour maximum noise level contribution, for planning approval purposes, at that

point as a result of a proposed new noise source

A. Background noise level is above

relevant recommended level (table 9)

Preferably, set maximum planning level 10dBA or more below relevant recommended level (table 9).

At least, set maximum planning level 10dBA below existing background level

B. Background noise level is at

recommended level

Set maximum planning level 10dBA below relevant recommended level (table 9)

C. Background noise level is below

recommended level by:

1dBA

2dBA

3dBA

4dBA

5dBA

6dBA or more

Set maximum planning level:

9dBA below recommended level





5dBA above background level

3.3.2 Determination of Planning Noise Levels

Restriction of emitted noise levels to planning noise levels will help protect against noise impacts such as

speech interference, community annoyance and, to some extent, sleep disturbance.

Table 9: Estimated maximum values of Planning Noise Levels (PNL) for proposed noise sources for different areas containing residences.

Noise area

category Description of neighbourhood

Maximum hourly sound pressure level, LAeq,1 hour (PNL)

Monday to Saturday

Sunday/public holidays

Day Evening Night

Z1 Very rural, purely residential. Less than 40

vehicles an hour 40 35 30

Z2 Negligible transportation. Less than 80 vehicles

an hour 50 45 40

Z3 Low-density transportation. Less than 200

vehicles an hour 55 50 45

Z4 Medium density transportation (less than 600

vehicles an hour) or some commerce or industry 60 55 50

Z5 Dense transportation (less than 1400 vehicles an

hour) or some commerce or industry 65 60 55

Z6 Very dense transportation (less than 3000

vehicles an hour) or in commercial or bordering industrial districts

70 65 60

Z7 Extremely dense transportation (3000 or greater

vehicles an hour) or within predominantly industrial districts

75 70 65

Where daytime is between 0700 and 1800 hours, evening is between 1800 and 2200 hours and night time is

between 2200 and 0700 hours. On Sundays and public holidays, daytime is defined as from 0900 to 1800 hours.



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Where the existing noise level from specific noise sources is close to the maximum planning level (Table 9), the

noise level from any new source(s) must be controlled to preserve the amenity of an area. If the total noise

level from specific sources already exceeds the maximum planning level for the area in question, the LAeq,1hour

noise level from any new source should not be greater than:

• 10dBA below the maximum planning level (Table 9) if there is a possibility that existing levels

may be reduced in the future; or

• 10dBA below the existing level if there is no such possibility that existing levels will fall (for

example in cases where surrounding areas are fully developed) and no significant changes to

land use are expected.

The implications of this requirement for noise from new specific sources are set-out in Table 10.

Table 10: Modification to recommended maximum planning noise level (PNL) to account for existing level of specific noise

Total existing noise level from specific sources (dBA)

Maximum planning noise level for noise from new sources alone (dB(A))

>= PNL + 2

If existing noise level is likely to decrease in future: PNL – 10

If existing noise level is unlikely to decrease in future: Existing Level – 10

PNL + 1 PNL – 9 PNL PNL – 8

PNL - 1 PNL – 6

PNL - 2 PNL – 4 PNL - 3 PNL – 3

PNL - 4 PNL – 2

PNL - 5 PNL – 2 PNL - 6 PNL – 1

< PNL - 6 PNL

3.3.3 Specific Noise Level

Calculation of the specific noise level or component level LAeq, 1 hour is determined by the following equation:

• LAeq, 1hr = minLA90, 1hr + 3

For a proposed new noise source/s, the planning noise level is based on a forecast of the specific noise level

(LAeq), as determined by the above equation, modified to account for tonal or impulsive characteristics.

3.3.4 Determination of Maximum Noise Levels for Sleep Disturbance

Research has shown that the ability to get to sleep and, when asleep, the probability of experiencing a change

of sleep state or ultimately of awakening are related to both the ambient and maximum instantaneous noise

levels at the ear of the sleeper and the number of events during the night time period (WHO 1999). As a rule in

planning for short-term or transient noise events, for good sleep over eight hours, the indoor sound pressure

level measured as a maximum instantaneous value should not exceed approximately 45dBA maxLpA more than

10-15 times per night. With an adjustment of +5 dB(A) to account for transmission through an open window,

this amounts to a limit of 50 dB(A) Lmax at residential façades.



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4. Noise Impact Assessment

4.1 Somerset Planning Scheme 2016 – Extractive Industries Code

Of the three resource extraction areas, the closest interface with nearby dwellings is located at the south-

easternmost corner. This extremity of the extraction area is more than 200m from receiver R2, as shown in

Plate 5 below. It is therefore concluded that the proposed Extractive Industry meets Acceptable Outcome

AO1.2 of the Extractive Industries Code.

Plate 5: Showing setback from closest residential use

It is further noted that both Banffs Lane and Rocky Gully Road are declared Transport Routes under the

Somerset Planning Scheme 2016, as reproduced in Plate 6 below. It is therefore concluded that the proposed

Extractive Industry can meet Acceptable Outcome AO1.3 of the Extractive Industries Code.

Plate 6: Overlay map OM006b (in part), showing declared Transport Routes



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4.2 DEHP Planning for Noise Control 2016

4.2.1 Background Noise Immission Planning Levels (min L90, 1hr)

Under the Guideline - Planning for Noise Control, recommended background noise levels are referenced to the

dominant land use in the receiving area, and existing background levels. Land uses in the locale include

residential, agricultural and industrial activity. In particular, the following existing uses are noted:

• Extractive industry, located to the immediate west of the site

• Poultry farming, located to the immediate east of the site

• Light aircraft landing strip, located to the immediate north of the site

In the absence of specific reference to agricultural activities, it is considered that the best fit for dominant land

use around the most affected receivers is “Rural Residential”. Outdoor recommended background levels of

40/35/30 dB(A) during day/evening/night periods are therefore applied.

Existing background levels at ML1 are below recommended background levels, and the background noise

immission planning levels have therefore been modified in accordance with the adjustments set out in Table 8

above.

Table 11: Background Noise Immission Planning Levels. Levels are in dB(A), L90 1hr

Day Evening Night

Recommended Background Level 40 35 30

Existing Background Level 33 32 25

Adjustment 5 dB(A) above

background 3 dB(A) below

recommended level 2 dB(A) below

recommended level

Background Noise Immission Level 38 32 28

4.2.2 Planning Noise Levels (LAeq, 1hr)

Under the Guideline - Planning for Noise Control, estimated maximum Planning Noise Levels (PNL) are

referenced to a noise area category, and to existing levels from a specific source. The locale is considered to be

best characterized by the Z2 noise area category, described as “Negligible transportation. Less than 80 vehicles

per hour”. Consequently, estimated maximum levels of 50/45/40 dB(A) during day/evening/night periods are

applied.

The average LAeq measured at ML1 was 48/41/41 dB(A) during day/eveing/night periods, which is generally

lower than the estimated maximum levels. Maximum Planning Noise Levels (PNL) have therefore been set with

reference to the adjustments presented in Table 10 above, and are summarized in Table 12 below.

Table 12: Maximum Planning Noise Levels (PNL). Levels are in dB(A) Leq, 1hr

Day Evening Night

Estimated maximum PNL 50 45 40

Measured levels 48 41 41

Adjustment PNL – 4 PNL – 2 PNL – 9

Modified maximum PNL 46 43 31



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4.2.3 Specific Noise Level/ Component Level (LAeq, 1hr)

Noise criteria have been calculated with reference to the equation presented in Section 3.3.3 above, and

reproduced below:

• LAeq, 1hr = minLA90, 1hr + 3

Applying this equation to the Rating Background Levels measured at ML1, noise criteria of 41/35/31 dB(A)

Leq,1hr are calculated, as summarized in Table 13 below.

Table 13: Specific Noise Level Criteria. Levels are in dB(A)

Day Evening Night

Background Noise Planning Level (minLA90, 1hr)

38 32 28

Component Level

(LAeq, 1hr) 41 35 31

4.3 Criteria Summary

Relevant criteria for noise assessment of the proposed development are summarized in Table 14 below.

Table 14: Summary of relevant assessment criteria. Levels are in dB(A), free-field

Descriptor Day Evening Night

Guideline - Planning for Noise Control

L90 38 32 28

Leq (Planning Noise Level) 46 43 31

Leq (Component level) 41 35 31

Lmax - - 50*

Acoustic Quality Objectives

Leq 40* 40* 35*

L10 45* 45* 40*

L01 50* 50* 45*

Leq (outdoors) 50 - -

L10 (outdoors) 55 - -

L01 (outdoors) 65 - -

EPP Controlling Background Creep

L90 33 32 25

Leq 38 37 30

*Converted to external values with a +5 dB(A) adjustment to account for transmission through an open window.



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4.4 Environmental Noise Model

Noise emissions from expected activities at the proposed development have been forecast using the

environmental noise model presented in Appendix B. Sound power levels have been calculated from

measurements previously undertaken by NMS and considered representative of expected activities. These

previous measurements are discussed in Appendix C. The following sources of noise emissions have been

identified:

• Caterpillar PC450 Excavator loading

• Caterpillar ADT07 Articulated Dump Truck unloading

• Water Truck spraying

• Caterpillar 966G Wheel Loader loading

• Compact sands plant (120t / hr)

• M2500 aggregate washing plant

Noise emissions have been characterized by the Leq descriptor. Night time extraction is not proposed, and Lmax

sleep disturbance criteria have therefore not been assessed. While some preparatory activity – such as vehicle

movements and maintenance – is expected between 6am and 7am, such activity will primarily occur at the

operational areas which are well setback from sensitive uses, and are expected to generate minor noise

impacts. It is further noted that the 6am to 7am period is arguably not representative of the night period, and

that an expectation of night-time amenity may not be appropriate, due to activity in the locale commencing

prior to 7am. While Queensland policy does not include formal recognition of a ‘shoulder period’ between 6am

and 7am, it is considered that this period is substantively distinct from the night period as a whole (for

example, compared to the 2am – 3am period).

The proposed extraction activities will be necessarily mobile over time, and will vary in precise location and

height. To assess potential noise impacts, noise emissions have been calculated from three indicative

locations:

• At the northernmost point of the northern extraction area

• At the south-western corner of the south-western extraction area

• At the south-eastern corner of the south-eastern extraction area

Noise emissions are expected to vary over time and to include significant periods of inactivity, although

calculations assume continuous activity as a realistic ‘worst-case’ assumption. Forecasts are based upon a

PC450 loading an ADT07, with a water truck operating concurrently. Other aspects of extraction – such as an

ADT07 moving between the excavator and the operational area(s) – are considered to generate lower noise

emissions, and have not been modelled. Additionally, all scenarios assume continuous activity from an ADT07

and 966G at the operational area(s), concurrent with activity from processing plant.

It is noted that site preparation – such as topsoil removal – may be regarded as construction activity rather

than resource extraction. Emissions from construction activity are by nature temporary, and are assessed

separately under the Environmental Protection Act 1994. The Act limits construction activity to 6:30am to

6:30pm Monday - Saturday, and site preparation – if classified as construction activity – is considered to meet

regulatory requirements during these hours.



20

To mitigate noise impacts, it is proposed that temporary 4.5m high barriers be provided (where required) to

screen the most potentially affected receivers from noise emissions. It is expected that resource extraction will

naturally create barriers of this (or greater) height in places, although earth berms can be constructed if

required. The development plans include an extraction cross-section which demonstrates the natural creation

of earth barriers through, as reproduced below.

Figure 2: Showing extraction cross-section

As shown above, it is expected that extraction will naturally generate screening. Depending on specific ground

conditions, it may be necessary to construct temporary noise barriers (such as earth bunds) in parts.

Alternatively, effective 4.5m high screening may be achievable through other methods, such as the appropriate

siting of shipping containers. Detailed screening calculations can be conducted – if required – when extraction

reaches sensitive areas, to take account of specific ground conditions and extraction plans.

4.4.1 Noise Emission Forecasts – Northern Extraction Area

Noise source locations for the northern scenario are presented below. Results from the environmental noise

model are presented following, along with applicable criteria. Details of the environmental noise model are

presented in Appendix B.

Plate 7: Noise point source and receiver point locations, as modelled. Northern scenario.



21

Table 15: Noise emission forecasts and DEHP criteria, northern scenario. Levels are in dB(A) Leq,1hr

Receiver Forecast Planning Noise Level Component Level

Assessment Day Evening Night Day Evening Night

No Noise Barrier Scenario

R1 27 46 43 31 41 35 31 Pass

R2 27 46 43 31 41 35 31 Pass

R3 25 46 43 31 41 35 31 Pass

R4 27 46 43 31 41 35 31 Pass

R5 27 46 43 31 41 35 31 Pass

R6 27 46 43 31 41 35 31 Pass

R7 31 46 43 31 41 35 31 Pass

R8 28 46 43 31 41 35 31 Pass

R9 26 46 43 31 41 35 31 Pass

R10 31 46 43 31 41 35 31 Pass

R11 39 46 43 31 41 35 31 Pass daytime

R12 32 46 43 31 41 35 31 Pass daytime

R13 24 46 43 31 41 35 31 Pass

R14 21 46 43 31 41 35 31 Pass

R15 22 46 43 31 41 35 31 Pass

4.5m Noise Barrier Scenario

R1 27 46 43 31 41 35 31 Pass

R2 27 46 43 31 41 35 31 Pass

R3 25 46 43 31 41 35 31 Pass

R4 27 46 43 31 41 35 31 Pass

R5 27 46 43 31 41 35 31 Pass

R6 27 46 43 31 41 35 31 Pass

R7 31 46 43 31 41 35 31 Pass

R8 28 46 43 31 41 35 31 Pass

R9 26 46 43 31 41 35 31 Pass

R10 31 46 43 31 41 35 31 Pass

R11 33 46 43 31 41 35 31 Pass daytime

R12 32 46 43 31 41 35 31 Pass daytime

R13 24 46 43 31 41 35 31 Pass

R14 21 46 43 31 41 35 31 Pass

R15 22 46 43 31 41 35 31 Pass



22

Table 16: Noise emission forecasts and EPP criteria, northern extraction area. Levels are in dB(A) Leq,1hr

Receiver Forecast

Acoustic Quality Objective (indoors)*

Acoustic Quality Objective (outdoors)

Controlling Background Creep Assessment

Day/Evening Night Day/Evening Day Evening Night


R1 27 40 35 50 38 37 30 Pass

R2 27 40 35 50 38 37 30 Pass

R3 25 40 35 50 38 37 30 Pass

R4 27 40 35 50 38 37 30 Pass

R5 27 40 35 50 38 37 30 Pass

R6 27 40 35 50 38 37 30 Pass

R7 31 40 35 50 38 37 30 Pass daytime

R8 28 40 35 50 38 37 30 Pass

R9 26 40 35 50 38 37 30 Pass

R10 31 40 35 50 38 37 30 Pass daytime

R11 39 40 35 50 38 37 30 + 1 dB(A)

R12 32 40 35 50 38 37 30 Pass daytime

R13 24 40 35 50 38 37 30 Pass

R14 21 40 35 50 38 37 30 Pass

R15 22 40 35 50 38 37 30 Pass


R1 27 40 35 50 38 37 30 Pass

R2 27 40 35 50 38 37 30 Pass

R3 25 40 35 50 38 37 30 Pass

R4 27 40 35 50 38 37 30 Pass

R5 27 40 35 50 38 37 30 Pass

R6 27 40 35 50 38 37 30 Pass

R7 31 40 35 50 38 37 30 Pass daytime

R8 28 40 35 50 38 37 30 Pass

R9 26 40 35 50 38 37 30 Pass

R10 31 40 35 50 38 37 30 Pass daytime

R11 33 40 35 50 38 37 30 Pass daytime

R12 32 40 35 50 38 37 30 Pass daytime

R13 24 40 35 50 38 37 30 Pass

R14 21 40 35 50 38 37 30 Pass

R15 22 40 35 50 38 37 30 Pass

* Adjusted by + 5 dB(A) to account for transmission loss through a fully open window

As shown above, worst-location noise emissions at the northern extraction area are forecast to generally meet

criteria during the daytime period without screening. A very minor (+1 dB(A)) exceedance of background creep

criteria is noted, although forecasts represent periods of continuous activity, and emissions are predicted to

meet background creep criteria when assessed over longer time periods, which will take account of

intermittent inactivity.



23

4.4.2 Noise Emission Forecasts – South-Western Extraction Area

Noise source locations for the south-western scenario are presented below. Results from the environmental

noise model are presented following, along with applicable criteria. Details of the environmental noise model

are presented in Appendix B.

Plate 8: Noise point source and receiver point locations, as modelled. South-western scenario.



24

Table 17: Noise emission forecasts and DEHP criteria, south-western scenario. Levels are in dB(A) Leq,1hr




R1 27 46 43 31 41 35 31 Pass

R2 28 46 43 31 41 35 31 Pass

R3 26 46 43 31 41 35 31 Pass

R4 31 46 43 31 41 35 31 Pass

R5 34 46 43 31 41 35 31 Pass daytime

R6 35 46 43 31 41 35 31 Pass daytime

R7 39 46 43 31 41 35 31 Pass daytime

R8 30 46 43 31 41 35 31 Pass

R9 26 46 43 31 41 35 31 Pass

R10 29 46 43 31 41 35 31 Pass

R11 30 46 43 31 41 35 31 Pass

R12 27 46 43 31 41 35 31 Pass

R13 21 46 43 31 41 35 31 Pass

R14 21 46 43 31 41 35 31 Pass

R15 22 46 43 31 41 35 31 Pass


R1 27 46 43 31 41 35 31 Pass

R2 28 46 43 31 41 35 31 Pass

R3 26 46 43 31 41 35 31 Pass

R4 31 46 43 31 41 35 31 Pass

R5 34 46 43 31 41 35 31 Pass daytime

R6 35 46 43 31 41 35 31 Pass daytime

R7 33 46 43 31 41 35 31 Pass

R8 28 46 43 31 41 35 31 Pass

R9 26 46 43 31 41 35 31 Pass

R10 29 46 43 31 41 35 31 Pass

R11 30 46 43 31 41 35 31 Pass

R12 27 46 43 31 41 35 31 Pass

R13 21 46 43 31 41 35 31 Pass

R14 21 46 43 31 41 35 31 Pass

R15 22 46 43 31 41 35 31 Pass



25

Table 18: Noise emission forecasts and EPP criteria, south-western extraction area. Levels are in dB(A) Leq,1hr

Receiver Forecast






R1 27 40 35 50 38 37 30 Pass

R2 28 40 35 50 38 37 30 Pass

R3 26 40 35 50 38 37 30 Pass

R4 31 40 35 50 38 37 30 Pass daytime

R5 34 40 35 50 38 37 30 Pass daytime

R6 35 40 35 50 38 37 30 Pass daytime

R7 39 40 35 50 38 37 30 + 1 dB(A)

R8 30 40 35 50 38 37 30 Pass

R9 26 40 35 50 38 37 30 Pass

R10 29 40 35 50 38 37 30 Pass

R11 30 40 35 50 38 37 30 Pass

R12 27 40 35 50 38 37 30 Pass

R13 21 40 35 50 38 37 30 Pass

R14 21 40 35 50 38 37 30 Pass

R15 22 40 35 50 38 37 30 Pass


R1 27 40 35 50 38 37 30 Pass

R2 28 40 35 50 38 37 30 Pass

R3 26 40 35 50 38 37 30 Pass

R4 31 40 35 50 38 37 30 Pass daytime

R5 34 40 35 50 38 37 30 Pass daytime

R6 35 40 35 50 38 37 30 Pass daytime

R7 33 40 35 50 38 37 30 Pass daytime

R8 28 40 35 50 38 37 30 Pass

R9 26 40 35 50 38 37 30 Pass

R10 29 40 35 50 38 37 30 Pass

R11 30 40 35 50 38 37 30 Pass

R12 27 40 35 50 38 37 30 Pass

R13 21 40 35 50 38 37 30 Pass

R14 21 40 35 50 38 37 30 Pass

R15 22 40 35 50 38 37 30 Pass


As shown above, worst-location noise emissions at the south-western extraction area are forecast to generally

meet criteria during the daytime period without screening. A very minor (+1 dB(A)) exceedance of background

creep criteria is noted, although forecasts represent periods of continuous activity, and emissions are predicted

to meet background creep criteria when assessed over longer time periods, which will take account of

intermittent inactivity.



26

4.4.3 Noise Emission Forecasts – South-Eastern Extraction Area

Noise source locations for the south-western scenario are presented below. Results from the environmental

noise model are presented following, along with applicable criteria. Details of the environmental noise model

are presented in Appendix B.

Plate 9: Noise point source and receiver point locations, as modelled. South-eastern scenario.



27

Table 19: Noise emission forecasts and DEHP criteria, south-eastern scenario. Levels are in dB(A) Leq,1hr




R1 41 46 43 31 41 35 31 Pass daytime

R2 47 46 43 31 41 35 31 + 6 dB(A)

R3 35 46 43 31 41 35 31 Pass daytime

R4 28 46 43 31 41 35 31 Pass

R5 26 46 43 31 41 35 31 Pass

R6 24 46 43 31 41 35 31 Pass

R7 25 46 43 31 41 35 31 Pass

R8 23 46 43 31 41 35 31 Pass

R9 21 46 43 31 41 35 31 Pass

R10 25 46 43 31 41 35 31 Pass

R11 31 46 43 31 41 35 31 Pass

R12 31 46 43 31 41 35 31 Pass

R13 26 46 43 31 41 35 31 Pass

R14 25 46 43 31 41 35 31 Pass

R15 26 46 43 31 41 35 31 Pass


R1 32 46 43 31 41 35 31 Pass daytime

R2 37 46 43 31 41 35 31 Pass daytime

R3 27 46 43 31 41 35 31 Pass

R4 28 46 43 31 41 35 31 Pass

R5 26 46 43 31 41 35 31 Pass

R6 24 46 43 31 41 35 31 Pass

R7 25 46 43 31 41 35 31 Pass

R8 23 46 43 31 41 35 31 Pass

R9 21 46 43 31 41 35 31 Pass

R10 25 46 43 31 41 35 31 Pass

R11 31 46 43 31 41 35 31 Pass

R12 31 46 43 31 41 35 31 Pass

R13 26 46 43 31 41 35 31 Pass

R14 25 46 43 31 41 35 31 Pass

R15 26 46 43 31 41 35 31 Pass



28

Table 20: Noise emission forecasts and EPP criteria, south-eastern extraction area. Levels are in dB(A) Leq,1hr

Receiver Forecast






R1 41 40 35 50 38 37 30 + 3 dB(A)

R2 47 40 35 50 38 37 30 + 9 dB(A)

R3 35 40 35 50 38 37 30 Pass daytime

R4 28 40 35 50 38 37 30 Pass

R5 26 40 35 50 38 37 30 Pass

R6 24 40 35 50 38 37 30 Pass

R7 25 40 35 50 38 37 30 Pass

R8 23 40 35 50 38 37 30 Pass

R9 21 40 35 50 38 37 30 Pass

R10 25 40 35 50 38 37 30 Pass

R11 31 40 35 50 38 37 30 Pass daytime

R12 31 40 35 50 38 37 30 Pass daytime

R13 26 40 35 50 38 37 30 Pass

R14 25 40 35 50 38 37 30 Pass

R15 26 40 35 50 38 37 30 Pass


R1 32 40 35 50 38 37 30 Pass daytime

R2 37 40 35 50 38 37 30 Pass daytime

R3 27 40 35 50 38 37 30 Pass

R4 28 40 35 50 38 37 30 Pass

R5 26 40 35 50 38 37 30 Pass

R6 24 40 35 50 38 37 30 Pass

R7 25 40 35 50 38 37 30 Pass

R8 23 40 35 50 38 37 30 Pass

R9 21 40 35 50 38 37 30 Pass

R10 25 40 35 50 38 37 30 Pass

R11 31 40 35 50 38 37 30 Pass daytime

R12 31 40 35 50 38 37 30 Pass daytime

R13 26 40 35 50 38 37 30 Pass

R14 25 40 35 50 38 37 30 Pass

R15 26 40 35 50 38 37 30 Pass




29

As shown above, potential exceedances are predicted at the south-easternmost corner, and it is recommended

that screening be provided to extraction activities. To establish a clear area of extraction where barriers are

recommended, a 35 dB(A) setback zone (representing the background creep criteria with a 3 dB(A) safety

margin) has been calculated from the most affected receiver (R2). The proposed setback zone is presented

below.

Plate 10: Showing proposed setback zone, within which screening is recommended

The 4.5m high barriers recommended are relative to the ground height at extraction. It is noted that extraction

to a height below that of the surrounding terrain can naturally generate screening from the earth walls of the

extractive area. Additional noise barriers may therefore not be required where the extraction area bench is

4.5m below the intervening ground height. The required 4.5m acoustic barrier may therefore be comprised of

temporary barriers, or natural screening from the extractive area, or from a combination of both which achieve

the 4.5m relative height.

The precise location(s) of barriers will depend upon the specific location and height of activities in relation to

R1 and R2. In general, barriers are required to completely block line of site to the sensitive receivers, and so

the exact siting of barriers will vary depending on the relationship between activity and receivers. Detailed

screening calculations can be conducted when extraction reaches the setback area, to take account of specific

ground conditions and extraction plans.



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Appendix A: Plans



31



32



33



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Appendix B: Environmental Noise Model

Noise modelling has been undertaken using SoundPLAN v7.0 using the CONCAWE prediction methodology with

nominal sound power levels sourced from measurements of representative activity at comparable extractive

industries (discussed in Appendix C), and from acoustic assessments of processing plant.

Topographic data included in the noise model for the locale has been sourced from development plans, and

from the Queensland Government.

B1 Noise Source Levels

Sound power levels – as modelled – are presented below. Impulsive characteristics were investigated in

accordance with the objective method as outlined in the Guideline – Planning for noise control. The difference

between levels measured by the Fast and Impulse responses for the ‘loader’ noise source was 2.3 dB, while the

difference for the remaining sources was less than 2 dB. Impulsive adjustments of +2.3 dB and +2.0 dB have

therefore been applied respectively. Sound power levels for processing plant have been calculated from

acoustic assessments provided by the client which are understood to be representative of proposed processing

plant.

Table B1: Sound Power Levels, in dB(Z), Leq. Includes adjustment for impulsiveness.

Source 63Hz 125Hz 250Hz 500Hz 1kHz 2kHz 4kHz 8kHz

Caterpillar PC450 Excavator

108.7 107.9 106.2 104.1 102.5 100.1 95.0 87.9

Caterpillar ADT07 Articulated dump truck

108.5 107.6 104.4 100.7 101.6 97.6 93.0 89.2

Caterpillar 066G wheel loader

111.9 107.8 109.4 99.7 95.9 97.5 92.8 89.1

Watertruck 112.9 102.1 96.5 97.7 99.9 99.9 93.7 90.6

M2500 Aggmax 95.2 100.2 104.3 105.4 106.0 104.3 101.9 97.9

Compact Sands Plant 91.2 96.2 100.3 101.4 102.0 100.3 97.9 93.9

B2 Meteorology

Forecasts assume stable meteorological conditions. The topography of the locale is not indicative of likely

significant katabatic wind flows, and temperature inversions conditions are not expected as proposed activities

are limited to the daytime period. Meteorological data sourced from the Bureau of Meteorology (presented in

Plate B1 below) does not indicate significant source to receiver wind conditions occurring 30% or more of the

time. Consequently, noise propagation calculations do not include significant wind effects.



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Plate B1: Showing the wind rose from the nearest Bureau of Meteorology station (source: BOM)



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B3 Noise Model Contours

Results from the environmental noise modelling are presented visually below. Plate B2: Noise contours at 1.8m, Northern Scenario, no barrier. Levels are in dB(A) Leq.

Plate B3: Noise contours at 1.8m, Northern Scenario, 4.5m barrier. Levels are in dB(A) Leq.



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Plate B4: Noise contours at 1.8m, South-Western Scenario, no barrier. Levels are in dB(A) Leq.

Plate B5: Noise contours at 1.8m, South-Western Scenario, 4.5m barrier. Levels are in dB(A) Leq.



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Plate B6: Noise contours at 1.8m, South-Eastern Scenario, no barrier. Levels are in dB(A) Leq.

Plate B7: Noise contours at 1.8m, South-Eastern Scenario, 4.5m barrier. Levels are in dB(A) Leq.



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Appendix C: Noise Source Measurements

Attended noise measurements of earthmoving equipment was conducted on the 10th of November, 2014 at an

existing Zanow sand quarry at Coominya, QLD. The machinery measured is considered to be representative of

earthmoving equipment to be used at the proposed Rock Gully Road Extractive Industry. Sound power levels

have been calculated from these measurements and have been used in the environmental noise model

presented in Appendix B.

Measurement of typical activity was undertaken at 1s time intervals, at a height of 1.4m. Distance to the noise

source was measured using a laser range finder. Results from these attended noise measurements are

presented in Table C1 and Photo C1 – C4 below.

Table C1: Measured sound pressure levels (SPL) and calculated sound power levels (SWL), in dB(Z) Leq

Distance 63Hz 125Hz 250Hz 500Hz 1kHz 2kHz 4kHz 8kHz

Water Truck Spraying

SPL 12m 81.5 70.7 65.1 66.3 68.5 68.5 62.3 59.2

SWL 110.9 100.1 94.5 95.7 97.9 97.9 91.7 88.6

Excavator Loading

SPL 40m 66.9 66.1 64.4 62.3 60.7 58.3 53.2 46.1

SWL 106.7 105.9 104.2 102.1 100.5 98.1 93.0 85.9

Articulated Dump Truck Unloading

SPL 15m 75.2 74.3 71.1 67.4 68.3 64.3 59.6 55.9

SWL 106.5 105.6 102.4 98.7 99.6 95.6 91.0 87.2

Wheel Loader Loading

SPL 30m 72.2 68.2 69.8 60.1 56.3 57.8 53.1 49.5

SWL 109.6 105.5 107.1 97.4 93.6 95.2 90.5 86.8

Sound power levels for processing plant has been calculated from acoustic assessment of comparable plant

provided by the client. Assessment of the compact sands plant was conducted by Noise and Vibration

Management Ltd (West Yorkshire, UK). Assessment of an M2500 and AggMax was conducted by CDE Global

(Tyrone, N Ireland).



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Photo C1: Showing the Water Truck (source: NMS)

Photo C2: Showing the Articulated Dump Truck



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Photo C3: Showing the Excavator

Photo C4: Showing the Wheel Loader



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Appendix D: Glossary

Ambient sound

All sounds in a locality or “soundscape” from distant and nearby sources or activity including traffic, bird song,

vegetation movement in the breeze, and so on.

Assessment Background Level (ABL).

The Assessment Background Level is the single figure background level representing each assessment period

(day, evening and night) for each day. It is determined by calculating the 10th percentile (lowest 10th percent)

background level (LA90) for each period.

Background sound pressure level (LA90,T), L90

Commonly called the "L90" or "background" level and is an indicator of the quietest times of day, evening or

night. The L90 level is calculated as the noise level equalled and exceeded for 90% the measurement time. The

level is recorded in the absence of any noise under investigation. The level is not adjusted for tonality or

impulsiveness. Also known as the background “noise” level.

Character of the environment

The character of the environment is often assessed by third-octave or narrow band analysis of the ambient

sound. Sounds may be characterised, for example, as “bangs”, “hum noise”, “plant sounds”, and “high

frequency sounds”. The assessment is required to determine intrusive noise, tonality or annoying character.

Equivalent Continuous or time average sound pressure level (LAeq,T), Leq

Commonly called the "Leq" level it is the logarithmic average noise level from all sources far and near and is

referenced to a specific measurement time interval; e.g. 15-minutes or 1-hour. The level can be adjusted for

tonality.

Immision

The sound energy received at a receptor location. Distinguished from emission, which relates to noise emitted

from a location.

LA10

The LA10 level is the noise level which is exceeded for 10% of the sample period. During the sample period, the

noise level is below the LA10 level for 90% of the time. The LA10 is a common noise descriptor for

environmental noise and road traffic noise.

NMS

Noise Measurement Services Pty Ltd

Rating Background Level (RBL)

The overall, single-figure, background level representing each assessment period (day/evening/night) over the

whole monitoring period (as opposed to over each 24-hour period used for the assessment of background

level). This is defined as the median value of all the day evening or night assessment background levels.

Report No 3773R3 26 May 2017 · 2018-08-08 · 1 20/04/2017 Report GR MT 2 04/05/2017 Revision to...

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