Residential Development, Former Colliery, Doncaster Road, ,

Noise Assessment Report

Doc ref: 03532-870200

01/02/2021

On behalf of Keepmoat Homes Ltd

Prepared by Owen Downey BSc(Hons) MIOA

CONTENTS

Page

1.0 INTRODUCTION 3

2.0 EXISTING NOISE SOURCES 5

3.0 NOISE SURVEY 9

4.0 PLANNING CONDITION 8 12

5.0 ACOUSTIC BARRIER NOISE MITIGATION 15

6.0 SUMMARY AND CONCLUSIONS 19

7.0 DISCLAIMER 20

FIGURE 1 – SITE AERIAL VIEW AND APPROXIMATE MEASUREMENT LOCATIONS 22

FIGURE 2 – INDICATIVE SITE LAYOUT PLAN OVERLAY WITH MEASUREMENT LOCATIONS 23

APPENDIX 1 – NOISE UNITS AND INDICES 24

APPENDIX 2 – NOISE SURVEY DATA 26

APPENDIX 3 – WEATHER DATA 33

Keepmoat Homes Ltd Former Firbeck Colliery, Doncaster Road, Costhorpe, Worksop

1.0 INTRODUCTION

1.1 Blue Tree Acoustics (BTA) has been appointed by Keepmoat Homes Ltd to carry out a noise assessment for a proposed new residential development at the site of the former Firbeck Colliery at Doncaster Road, Costhorpe, Worksop.

1.2 The proposed residential development is at the site of the former Firbeck Colliery, which is situated off the A60 Doncaster Road just north of Costhorpe, and is now disused. The surrounding area has a mixture of uses, with Country Park occupying land generally to the north and west. To the east are playing fields/sports pitches, and beyond these are existing residential properties situated along the A60, which runs north-south at around 200m distance from the eastern site boundary. The site is bounded by Lawn Road Industrial Estate to the south and southeast, and an electricity substation is situated adjacent to the northwest corner of the site. There are also existing residential properties situated on Lawn Road and Northumberland Road.

1.3 Planning permission has been granted for residential development of the site (ref. 15/01457/FUL). This report has been produced in relation to an application for variation of Condition 8 of the Reserved Matters Application pertaining to the development (ref. 19/01137/RES), which states:

“8. Before any dwelling hereby permitted is first occupied, a scheme and timetable for the provision, of the earth bund and acoustic fencing shown on drawing No. 2043-YK2-01 Rev. B shall be submitted to and agreed in writing with the Local Planning Authority. The erection of bund and acoustic fencing shall be carried out only in accordance with the agreed scheme and timetable.

Reason: In the interest of the amenities of occupiers of the permitted scheme.”

1.4 A glossary of technical terminology and parameters used in this report is provided in Appendix 1.

1.5 The noise impact assessment has included:

i) Inspection of the site and surroundings.

ii) Review of relevant documentation and architectural plans for the proposed development provided by the Client/Design Team.

iii) Noise monitoring surveys undertaken at locations on the site during daytime and nighttime.

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iv) Evaluation of the site in accordance with relevant planning policy guidance.

1.6 Consideration of noise control measures required to maintain acceptable noise levels within the proposed new dwellings with reference to British Standard 8233:2014, ‘Guidance on sound insulation and noise reduction for buildings’ (BS8233), and Local Authority requirements.

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2.0 EXISTING NOISE SOURCES

Road

2.1 Road traffic on the A60 Doncaster Road is audible across the site, with regular passing vehicles during daytime and nighttime. More distant road traffic was also audible at all locations across the development site.

Commercial/Industrial Premises

2.2 There are various commercial and light industrial premises situated at Lawn Road Industrial Estate to the southeast of the development site. The premises in the vicinity of the site boundary comprise units housing businesses such as MOT/vehicle repairs, L&H Engineering, Firbeck Construction, Markham (Sheffield), SHL Refractories, PowerPoint Ltd, Blyth Marble, Blyth Metals, and ECF Special Alloys.

2.3 Typical operation of such premises involves some units in operation, whilst others may be vacant and not in use. Noise generation is typically sporadic and intermittent, for example noise from use of hand/powered tools, compressors, vehicles, etc., rather than from continually running plant or processes. This was generally evident in subjective observation during our site visits, and from analysis of the survey data, although operation of a continually running fan at the rear of the ECF Special Alloys premises was noted during the daytime surveys. The Lawn Road premises appeared to generally operate during daytime hours only.

2.4 The Lawn Road commercial premises are also in proximity to existing residential properties situated on Lawn Road and Northumberland Avenue, and therefore it is expected that the existing controls in place to limit noise impact on the existing residential receptors may, in some cases, also help to protect occupiers of the proposed development. Nonetheless, the proposed new dwellings will be designed to provide sound insulation commensurate to the prevailing environmental noise levels to meet acoustic criteria defined in relevant acoustic standards and Local Authority guidance.

2.5 An electricity substation is situated adjacent to the northwest corner of the development site.

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Environmental noise climate during COVID-19 pandemic

2.6 As this assessment was being undertaken while COVID-19 pandemic restrictions were in force in the UK, the potential for environmental noise levels to be lower than usual has been considered.

2.7 The Association of Noise Consultants (ANC) and the Institute of Acoustics (IOA) have provided a guidance document ‘Joint Guidance on the Impact of COVID-19 on the Practicality and Reliability of Baseline Sound Level Surveying and the Provision of Sound & Noise Impact Assessments’ (Version 5 dated 01/09/2020 was in place at the time of the survey). This document provides guidance on working practices in the production of acoustic assessments and reports during COVID-19 pandemic restrictions, in order to help maintain the flow of acoustic reporting in a timely manner to assist planning applications, discharge of planning conditions, and the implementation of building regulations, etc.

2.8 The guidance aims to help minimise uncertainties when determining baseline conditions. In this regard, it advocates use of the following examples (although the most appropriate options to use must be determined on a case-by-case basis):

a) Wherever possible, a site visit should be undertaken to understand the sound environment and the sources contributing to the sound environment.

b) Site survey data can be supplemented by data from other sources such as using existing data (for example, from previous local surveys and noise maps) or undertaking baseline sound predictions to establish an appropriate robust estimate of baseline conditions.

c) For transport schemes, there may still need to be some reliance on predicted sound levels to describe the baseline conditions, with a corresponding need to source flow/activity data. References to online noise mapping resources are provided in the guidance.

d) Use of online government statistics on transport use during the pandemic.

e) Liaison with regulators and decision-makers.

2.9 These factors have been considered in the preparation of this report.

2.10 COVID-19 pandemic Tier 2 restrictions were in force at the time of the main survey between Thursday 30/07/2020 and Monday 03/08/2020. Full lockdown restrictions were in force at the time of the additional survey on Thursday 07/01/2021. Data from the Department for Transport (DfT) government statistics table on transport use during the COVID-19 pandemic for the period of interest is reproduced below.

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Table 1: DfT transport use statistics around the time of site surveys

2.11 The joint ANC/IOA guidance refers to online resources for strategic noise mapping covering the major sources of transportation noise within large urban agglomerations and along road and rail corridors between them, designed to provide a global view of noise exposure in line with the reporting requirements of the Environmental Noise Directive. Extrium’s online Noise and Air Quality Viewer provides annual average noise levels for both the 16-hour day period between 0700-2300 hours, and the 8-hour night period between 2300-0700 hours. Noise levels are modelled on a 10m grid at a receptor height of 4m above ground, with contours produced by displaying noise classes ranging from 55-75dB in 5dB steps.

2.12 For the development site, the noise maps indicate the site is beyond the range of the modelled

traffic noise contours, i.e. average daytime sound levels are below 55dB LAeq,16hr, and average

nighttime sound levels are below 50dB LAeq,16hr.

2.13 Considering the above, the % changes in transport use are not considered to have significantly affected the surveys undertaken between Thursday 30/07/2020 and Monday 03/08/2020, i.e. an

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average change of 90% in ‘All motor vehicles’, which equates to <0.5dB change in noise level. The measurements undertaken on Thursday 07/01/2021 were specifically to assess noise emitted by the substation, and therefore any potential reduction in transport noise at that time will be of minimal effect, although under normal traffic conditions a greater degree of sound masking of the substation by the traffic might be expected.

2.14 With regard to noise from nearby commercial premises at the time, it is possible that some businesses were operating at restricted levels, or were temporarily closed. However, the relatively high use of commercial and goods vehicles between Thursday 30/07/2020 and Monday 03/08/2020 could suggest relatively normal commercial activities. In addition, the sound levels measured during these surveys are of broadly similar magnitude to those measured during the previous Wardell Armstrong survey at comparable locations.

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3.0 NOISE SURVEY

3.1 Noise monitoring was undertaken by Blue Tree Acoustics to assess the existing ambient noise climate at the site. Measurements were taken during representative daytime and nighttime survey periods.

3.2 Attended external noise measurements were taken at the development site from Thursday 30/07/2020 into Friday 31/07/2020, on Monday 03/08/2020, and on Thursday 07/01/2021. The measurement locations are indicated in Figure 1.

3.3 Noise measurements were carried out using 2no Rion NA-28 Type 1/Class 1 Integrating Sound Level Meters and 1no Rion NL-52 Type 1/Class 1 Integrating Sound Level Meter. Each meter was within a valid period of laboratory calibration. Calibration checks were carried out both before and after the measurements, with no variance observed. A proprietary environmental windshield was fitted to the microphone in each case, and the microphone was attached to a tripod at approximately 1.5m height from local ground level. Measurement locations were in ‘free-field’ conditions, i.e. >3.5m distant from acoustically reflecting surfaces and structures, other than the ground.

3.4 Weather conditions during the measurement periods were dry and calm for the majority of the time. Archival data from a nearby weather station is presented in Appendix 3.

3.5 The measurement results are detailed in Appendix 2, and are summarised in the tables below to show the measured noise levels at locations in the vicinity of the site.

Table 2: Measured free-field external noise levels – Location 1

Period dB LAeq,15min dB LAmax,15min dB LA10,15min dB LA90,15min 35 - 48 Day 51 - 67 37 - 48 29 - 38 (Average = 42) 32 - 37 Night 50 - 54 35 - 40 27 - 32 (Average = 35)

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Table 3: Measured free-field external noise levels – Location 2

Period dB LAeq,15min dB LAmax,15min dB LA10,15min dB LA90,15min 40 - 58 Day 56 - 84 43 - 58 31 - 40 (Average = 51) 36 - 45 Night 56 - 70 38 - 49 26 - 35 (Average = 42)

Table 4: Measured free-field external noise levels – Location 3

Period dB LAeq,15min dB LAmax,15min dB LA10,15min dB LA90,15min 35 - 51 Day 50 - 73 37 - 51 30 - 47 (Average = 46) 32 - 37 Night 53 - 55 34 - 39 27 - 32 (Average = 34)

Table 5: Measured free-field external noise levels – Location 4

Period dB LAeq,15min dB LAmax,15min dB LA10,15min dB LA90,15min 40 - 56 Day 51 - 74 41 - 57 39 - 55 (Average = 50) 40 - 45 Night 51 - 66 41 - 43 39 - 40 (Average = 42)

Table 6: Measured free-field external noise levels – Location 5

Period dB LAeq,15min dB LAmax,15min dB LA10,15min dB LA90,15min 34 - 60 Day 48 - 89 37 - 64 29 - 48 (Average = 54) 33 - 48 Night 54 - 59 34 - 50 26 - 47 (Average = 44)

Table 7: Measured free-field external noise levels – Location 6

Period dB LAeq,15min dB LAmax,15min dB LA10,15min dB LA90,15min 39 - 43 Day 52 - 62 40 - 46 34 - 38 (Average = 41) 32 - 39 Night 47 - 59 36 - 42 26 - 33 (Average = 36)

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Table 8: Measured free-field external noise levels – Location 7

Period dB LAeq,15min dB LAmax,15min dB LA10,15min dB LA90,15min 42 - 43 Day 61 - 62 43 - 44 40 - 41 (Average = 43)

Table 9: Measured free-field external noise levels – Location 8

Period dB LAeq,15min dB LAmax,15min dB LA10,15min dB LA90,15min 39 - 42 Day 56 - 62 41 - 45 38 (Average = 41)

3.6 Distant traffic noise was audible at all locations throughout the day and night survey periods. Intermittent noise from activities at different premises at the Lawn Road Industrial Estate was clearly audible at times and mostly occurred during the day. Generally, activities at the Lawn Road Industrial Estate units commenced around 0630-0700 hours and finished around 1630-1700 hours. The most prominent noisy industrial activities occurred from around 0800 hours onwards.

3.7 Whilst the magnitude of noise levels at the site are considered modest (i.e. average daytime

sound levels <55dB LAeq and average nighttime sound levels <45dB LAeq), the recommendations for noise mitigation measures shall also consider short-term periods when noise levels are elevated above the average levels, in order to reduce the potential for adverse effects (e.g. due to intermittent activities at nearby commercial units). For example, during our survey the most prominent noise events experienced were the continuous fan operation (which gave a level of

56dB LAeq,15min at Location 4), and tipping materials into a metal waste skip (which gave a level of

60dB LAeq,15min at Location 5).

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4.0 PLANNING CONDITION 8

4.1 Condition 8 of the Reserved Matters Application pertaining to the development (ref. 19/01137/RES) states:

“8. Before any dwelling hereby permitted is first occupied, a scheme and timetable for the provision, of the earth bund and acoustic fencing shown on drawing No. 2043-YK2-01 Rev. B shall be submitted to and agreed in writing with the Local Planning Authority. The erection of bund and acoustic fencing shall be carried out only in accordance with the agreed scheme and timetable.

Reason: In the interest of the amenities of occupiers of the permitted scheme.”

4.2 Drawing ref. 2043-YK2-01 Rev.B is based on recommendations given in the previous Wardell Armstrong (WA) noise assessment report (ref. SH10392 dated September 2015) for a 5m high bund/fence acoustic barrier arrangement. This acoustic barrier is proposed along the southeastern site boundary with the neighbouring Lawn Road Industrial Estate. The current development design proposal is for a 3m high acoustic fence running similarly along the southeastern site boundary. Therefore, a variation of the design permitted by Condition 8 is sought.

4.3 The WA report defines appropriate acoustic criteria for residential dwellings based on the recommendations of British Standard 8233: 2014, ‘Guidance on sound insulation and noise reduction for buildings’ (BS8233:2014). This standard provides information on the design of internal acoustics in buildings. It deals with control of noise from outside the building, noise from plant and services within it, and room acoustics for non-critical situations.

4.4 The acoustic design criteria set out in the WA report for residential accommodation are summarised as follows:

“35dB LAeq(16 hour) during the day time in noise sensitive rooms

30dB LAeq(8 hour) during the night time in bedrooms

45dB LAmax(fast) during the night time in bedrooms

55dB LAeq(16 hour) in external gardens”

4.5 Following the granting of the hybrid planning application (ref. 15/01457/FUL), we are aware of subsequent correspondence from WA (ref. RC/SCU/GM11091-001 dated 28/02/2020) that again refers to the above noise criteria, as well as supplementary criteria provided by

Council (BDC) on 04/10/2019 that references BS8233 and recommends targets of “30dB LAeq in

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bedrooms” (presumed to be intended as during nighttime), and “50dB LAeq in outdoor spaces” (presumed to refer to daytime sound levels in private gardens) as a guide.

4.6 The WA report and recommendations are based on a limited noise survey undertaken in June 2015. From this, the 5m high acoustic barrier is based on generic calculations presented in the report for an unspecified noise source at 0.5m height and 50m distance from the barrier.

4.7 The findings of our site surveys presented herein, and in BTA report ref. 03532-870100 relating to discharge of Condition 6 and Condition 7 of the same planning permission, include measurements of general industrial noise from the Lawn Road Industrial Estate, as well as specific industrial noise sources observed nearer to the barrier than the WA assumption of 50m. Whilst these sources are nearer to the site boundary, this increases the effectiveness of the acoustic barrier arrangement.

4.8 Calculations have been undertaken based on the noise survey results detailed herein and the 3m high acoustic barrier described in Section 5.0 below. The calculations also take into account information provided in the land survey (Haycock & Todd drawing ref. S9779 dated September 2020) and topographical plans (iD Civils Design drawings ref. 5004-C-D1-08 and 5004-C-D1-08 dated 03/02/2020) that have been provided for the development. These generally indicate that ground level at the dwellings and acoustic barrier will be around 1-2m above that at the nearby Lawn Road Industrial Estate units, and this height difference has been taken into account in the acoustic barrier calculations. The WA barrier calculation assumed level ground between the noise source and receiver.

4.9 Considering the above, the noise mitigation provided by the acoustic barrier design set out in Section 5.0 below is sufficient to satisfy the noise criteria established in the WA report and BDC requirements, and therefore is considered equally suitable to meet the requirements of Condition 8. In addition, the acoustic performance of the enhanced glazing and ventilation specified in BTA report ref. 03532-870100 is greater than that outlined in the original WA report, and has also been designed to satisfy the acoustic criteria established for the development, in conjunction with the proposed acoustic barrier.

4.10 It is acknowledged it is possible that there may be times when industrial noise levels exceed those measured during the site surveys undertaken by either BTA or WA. However, this potential for increase in noise impact already exists under the permitted Condition 8, so there would be no significant change under the proposed variation, and it is impossible to predict what future noise

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events may or may not occur, and to mitigate against this. The current proposals are based on detailed noise surveys at the site, and therefore provide a reasonable basis for acoustic design to meet the criteria previously established as appropriate for the development. Furthermore, as identified above, there are existing residential properties in the vicinity of the Lawn Road Industrial Estate units, and so there will always be a limiting factor in controlling noise generated by the industrial units.

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5.0 ACOUSTIC BARRIER NOISE MITIGATION

5.1 A 3m high acoustic fence is proposed along the southeastern site boundary with the Lawn Road

Industrial Estate in order to reduce noise levels to within 50dB LAeq,16hour in gardens. This is indicated by the red line in Markup 1 below.

5.2 Acoustic fencing of 2.4m height is additionally proposed for gardens near the electricity substation in order to satisfy the requirements of Condition 7 (as indicated by the orange line in Markup 1 below and also as described in BTA report ref. 03532-870100).

5.3 Examples of calculations for the predicted barrier sound attenuation provided by the proposed 3m high acoustic fence are presented below, demonstrating that sufficient sound reduction can be provided to meet the criteria.

5.4 Calculation 1 considers the sound reduction to the garden of Plot 140, i.e. nearest to the observed continuous running fan, which is represented by a noise source at 3m above local ground level.

Calculation 1: Barrier calculation between continuous fan and Plot 140 Garden

5.5 The representative average daytime sound level at Location 4 (nearest to the fan location and

proposed Plot 140 location) was found to be 50dB LAeq,16hour, and 56dB LAeq,15min when the fan was running. Considering the predicted reduction of 10dB(A) provided by the 3m high acoustic fence,

distance to the Plot 140 garden, and building reflections, the 50dB LAeq,16hour criterion is expected to be met in normal daytime conditions. The short-term noise generated by the operational fan

is also predicted to be less than 50dB LAeq in the garden.

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5.6 Calculation 2 considers the sound reduction to the garden of Plot 150, i.e. nearest to the observed waste skip noise, which is represented by a noise source at 1.5m above local ground level.

Calculation 2: Barrier calculation between waste skip and Plot 150 Garden

5.7 The representative average daytime sound level at Location 5 (nearest to the skip location and

proposed Plot 150 location) was found to be 54dB LAeq,16hour, and 60dB LAeq,15min when the skip noise was occurring. Considering the predicted reduction of 13dB(A) provided by the 3m high

acoustic fence, distance to the Plot 150 garden, and building reflections, the 50dB LAeq,16hour criterion is expected to be met in normal daytime conditions. The short-term noise generated by

the waste skip is also predicted to be less than 50dB LAeq in the garden.

5.8 The magnitude of sound reduction provided by the acoustic fencing will vary depending on the position of a noise source relative to the barrier and to the residential receiver. However, as indicated by Calculation 1 and Calculation 2, a reduction of around 10dB(A) or greater is expected to the gardens and ground floor windows of the house plots situated closest to the southeastern boundary. The 1st floor windows of these plots will be more exposed to industrial noise sources, but an enhanced level of acoustic glazing and ventilation has been proposed to living room and bedroom windows on plots nearest the boundary (as detailed in BTA report ref. 03532-870100), and this mitigation is sufficient to satisfy the acoustic criteria defined for bedrooms.

5.9 House plots further into the site, i.e. to the north/northwest of the boundary with Lawn Road Industrial Estate, will experience lower sound levels due to the increased distance from Lawn Road and the acoustic scattering and diffusion effects provided by the intervening new houses.

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Markup 1: Acoustic mitigation and glazing and ventilation specification.

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5.10 Acoustic fencing should be constructed of solid, weather-treated timber (or ply) of minimum 18mm thickness. All joints should be tight-butted with timber cover strips or tongue and groove boards to ensure that there are no airgaps in the structure or between the base of the fence and the ground beneath. Alternatively, acoustic barriers can be created from almost any solid material that can be made impermeable to air; for example, the barrier could be constructed from masonry, concrete, plastic, timber panels, etc., if desired. Proprietary acoustic fencing products are available from various suppliers, such as Jacksons Jakoustic® fencing. The manufacturer’s guidance and installation instructions must be followed for all proprietary systems.

5.11 The specifications given above are recommendations based on the information currently available for the proposed development, and should be checked during the detailed building design stage. Equivalent acoustic performance may be achieved by other materials or products, but acoustic performance data for all proposed systems should be checked by a competent acoustic consultant in order to ensure adequate acoustic performance will be achieved.

5.12 It should be acknowledged that careful design and close attention to detail, along with high standards of site supervision and workmanship, are essential in achieving the required acoustic performance, particularly in relation to controlling flanking sound transmission paths, airgaps, and use of suitable materials. Therefore, effective work management plans will be needed to ensure all contractors and tradesmen are aware of the acoustic performance requirements and details to ensure works are implemented to the necessary standard.

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6.0 SUMMARY AND CONCLUSIONS

6.1 A noise assessment has been carried out on behalf of Keepmoat Homes Ltd for a proposed residential development at the site of the former Firbeck Colliery at Doncaster Road, Costhorpe, Worksop.

6.2 The assessment has been undertaken for an application to vary Condition 8 of the Reserved Matters Application pertaining to the development (ref. 19/01137/RES), and has followed relevant planning and acoustic guidance documents (e.g. BS8233:2014).

6.3 A survey has been undertaken at the development site over representative daytime and nighttime periods in order to determine the prevailing environmental noise levels and address the requirements of Condition 8.

6.4 The proposed 3m high acoustic fencing along the southeastern boundary is capable of providing sufficient sound reduction to meet appropriate noise level criteria defined for the development, in line with BS8233:2014 and BDC requirements. In addition, enhanced acoustic specification of ventilation and glazing have been recommended in BTA report ref. 03532-870100 to meet the acoustic requirements of Condition 6 and Condition 7 of the planning permission.

6.5 On the basis of the above, the proposed 3m high acoustic fencing is considered suitable to permit variation of the condition, and the following is suggested:

“8. Before any dwelling hereby permitted is first occupied, a scheme and timetable for the provision of the acoustic fencing shown on drawing No. [TBC] shall be submitted to and agreed in writing with the Local Planning Authority. The erection of the acoustic fencing shall be carried out only in accordance with the agreed scheme and timetable.

Reason: In the interest of the amenities of occupiers of the permitted scheme.”

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7.0 DISCLAIMER

7.1 This document is limited to addressing the specific acoustic issued contained herein, and its content is based on drawings and information provided to date by our Client/their Design Team.

7.2 All findings, comments, recommendations, etc., in this document are for acoustic purposes only; any and all other considerations and requirements, e.g. structural, airflow, thermal, fire safety, CDM compliance, determination of whether materials are dangerous, hazardous, deleterious, etc. (non-exhaustively), are the responsibility of other such suitably qualified specialists to check and advise on.

7.3 BTA’s work may occasionally involve provision of acoustic performance advice and acoustic design recommendations that others may choose to regard as a "specification" under CDM 2015 (and thus others may occasionally choose to regard BTA to be a "Designer" under CDM 2015). Notwithstanding this, it is always the responsibility of others (Principal Designer) to approve/incorporate into their final design – or not – their final specification selections; although these may be based on BTA’s acoustic performance advice, as BTA neither has control over how or whether BTA’s acoustic advice is incorporated into the final design by others, nor any power to enforce that any such final specification selections made by others based on BTA’s advice are appropriate in any regard beyond their acoustic performance qualities, it also remains the responsibility of others under CDM 2015 to ensure that any ancillary (non-acoustic) considerations in the course of selection, installation, maintenance, etc. of final specifications are advised upon by such relevantly qualified specialists (non-acoustic, and therefore non-BTA), and that any safety precautions identified in the course of their consideration by others are taken by others (the Principal Designer, Designers, Contractors, Client, etc.).

7.4 Products and materials that perform well acoustically tend to be heavier than standard products. Use of these products and materials may increase the weight of the element, and the CDM Principal Designer, Client, etc. must take care to ensure that this risk is mitigated as far as possible with appropriate changes to their design, and the Client, Principal Contractor, Contractor, Installer, Fitter, etc. must ensure that appropriate and safe lifting and installation techniques, maintenance, etc. are used to reduce any remaining risk. Wherever BTA advises that works such as acoustic barriers are desirable to attenuate noise, care must be taken by the CDM Principal Designer, Client, etc. to ensure that the risks associated with constructing and maintaining bunds, walls, fences, etc. are mitigated as far as possible with appropriate changes to their design, and the Client, Principal Contractor, Contractor, Installer, Fitter, etc. must ensure

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that appropriate and safe construction and installation techniques, maintenance, etc. are used to reduce any remaining risk.

7.5 This document has been prepared for the sole use, benefit, and information of our direct Client for the purposes agreed at the time of their formal instruction. The liability of BTA in respect of the information contained herein will not extend to any third party.

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FIGURE 1 – SITE AERIAL VIEW AND APPROXIMATE MEASUREMENT LOCATIONS

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FIGURE 2 – INDICATIVE SITE LAYOUT PLAN OVERLAY WITH MEASUREMENT LOCATIONS

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APPENDIX 1 – NOISE UNITS AND INDICES a) Sound Pressure Level and the decibel (dB)

A sound wave is a small fluctuation of pressure in air. The human ear responds to these variations in pressure, producing the sensation of hearing. The ear can detect a very wide range of pressure variations. Due to the wide range of pressure variations detectable by the ear, a logarithmic scale is used to convert the values into manageable numbers. The dB (decibel) is the logarithmic unit used to describe sound (or noise) levels. The usual range of sound pressure levels is from 0dB (threshold of hearing) to 120dB (threshold of pain). b) Frequency and Hertz (Hz)

Frequency is a measure of the rate of fluctuation of a sound wave. The unit used is cycles per second, or Hertz (Hz). Sometimes large frequencies are often written as kilohertz (kHz), where 1kHz = 1000Hz.

Young people with normal hearing can hear frequencies in the range 20Hz to 20kHz. However, the upper frequency limit gradually reduces as a person gets older.

As the ear hears some frequencies better than others, the A-weighting scale is used to mimic human hearing. A-weighing applies a correction to the sound level at a given frequency depending on how well the ear hears that frequency. c) Glossary of Terms

In order to describe noise where the level is continuously varying, a number of other indices, including statistical parameters, are used. The indices used in this report are described below.

LAeq This is the A-weighted equivalent continuous sound level which is an average of the total

sound energy measured over a specified time period. In other words, LAeq is the level of a continuous noise which has the same total (A-weighted) energy as the real fluctuating noise, measured over the same time period.

LAmax This is the maximum A-weighted sound level that was recorded during the monitoring period.

LA90 This is the A-weighted sound level exceeded for 90% of the time period. LA90 is used as a measure of background noise.

LA10 This is the A-weighted sound level exceeded for 10% of the time period and is often used in the assessment of road traffic noise.

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NR Measured noise levels in each octave band are compared to the NR curve reference values. The overall NR value is the lowest NR curve that has not been exceeded.

DnT,w Weighted standardised level difference, a single figure generated by comparing the DnT with a reference curve. The reference curve is shifted in 1dB steps until the sum of adverse deviation of the test curve, compared to the reference curve, is as large as possible, but no more than 32.0dB. The value of the shifted reference curve at 500Hz is

taken as the DnT,w. N.B. As DnT,w for airborne transmission represents a level difference, an improvement generates a larger figure – used in airborne tests.

Rw Similar to the DnT,w term, but a measure of the airborne sound insulation performance of a separating element, when tested in laboratory conditions. As such the build is

essentially perfect, and has no flanking noise routes. DnT,w values measured onsite will

always be of a significantly lower value than the Rw value for a structure.

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APPENDIX 2 – NOISE SURVEY DATA

Location 1 – Western site boundary, on hardstanding

Rion NA-28 sound level meter S/N 00770486. All values dB(A), 15-minute duration, free-field.

N.B. The spike at 1610 hours in the above chart is attributable to motorbikes being ridden onsite; excluded from assessment.

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Location 2 – Northeastern site boundary, on entrance road

Rion NA-28 sound level meter S/N 00770486. All values dB(A), 15-minute duration, free-field.

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Location 3 – Southern site boundary, near Lawn Road Industrial Estate

Rion NL-52 sound level meter S/N 01021281. All values dB(A), 15-minute duration, free-field.

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Location 4 – Southern site boundary, near Blyth Marble / HJ Joinery

Rion NL-52 sound level meter S/N 01021281. All values dB(A), 15-minute duration, free-field.

N.B. The first measurement in the above chart is of 10-minute duration, the second is of 1-minute duration, and the rest are all of 15-minute duration.

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Location 5 – Southern site boundary, near L&H Engineering Ltd

Rion NL-52 sound level meter S/N 01021281. All values dB(A), 15-minute duration, free-field.

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Location 6 – Southern site boundary, near PowerPoint Ltd

Rion NL-52 sound level meter S/N 01021281. All values dB(A), 15-minute duration, free-field.

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Location 7 – Northwestern site boundary, near substation

Rion NA-28 sound level meter S/N 00501389. All values dB(A), 15-minute duration, free-field.

Date Time LAeq LAmax LA10 LA90 Comment 07/01/2021 13:04 42.6 61.8 44.1 40.4 Substation ‘hum’, birdsong, intermittent noise from stripping out works onsite, distant traffic, and 07/01/2021 14:03 42.3 60.7 43.2 40.6 occasional distant industrial noise

Location 8 – Northwestern site boundary, near substation

Rion NA-28 sound level meter S/N 00501389. All values dB(A), 15-minute duration, free-field.

Date Time LAeq LAmax LA10 LA90 Comment 07/01/2021 12:47 39.4 61.8 40.5 37.5 Substation ‘hum’, birdsong, intermittent noise from stripping out works onsite, distant traffic, and 07/01/2021 13:39 42.0 56.3 44.7 37.8 occasional distant industrial noise

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APPENDIX 3 – WEATHER DATA

Thursday 30/07/2020

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Friday 31/07/2020

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Monday 03/08/2020

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Thursday 07/01/2021

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