APL Noise Impact Assessment

• 2.4. Free Field Source Sound Pressure Levels at 10m KR Associates (UK) Ltd have not yet been provided with the full engineering selection for the refrigeration and air conditioning equipment. The existing climate allows for the installation of two standard packaged units to provide the refrigeration duty for the site and two Daikin VRV units running in Low Noise Mode 3 (30 kw cooling). The final plant selection should ensure the equipment complies with the following requirements.

Source	Description of Source<br><br>	Sound Pressure at 10m – Annex C 13487: 2003	Sound Pressure at 10m – Annex C 13487: 2003	Sound Pressure at 10m – Annex C 13487: 2003
Source	Description of Source<br><br>	07:00 – 19:00	19:00 – 23:00	23:00 – 07:00
Source 1	Standard CO2 Packaged Gas Cooler	Lp(10)40 dB	Lp(10)40 dB	Lp(10)30 dB
Source 2	Standard CO2 Packaged Gas Cooler	Lp(10)40 dB	Lp(10)40 dB	Lp(10)30 dB
Source 3	Daikin VRV (30 kw) (Assumed Unit Selection)	Lp(10)39 dB	Lp(10)39 dB	Not Operating
Source 4	Daikin VRV (30 kW) (Assumed Unit Selection)	Lp(10)39 dB	Lp(10)39 dB	Not Operating

3. Background Noise Levels…

• 3.1. Weather During Survey

• 3.1.1 Wind Speed, Gust and Direction
• 3.1.2 Rainfall, Temperature and Dew Point
• 3.1.3 Impact of Weather An analysis of the background data recorded on site indicates that the prevailing weather did not adversely impact the results. The wind speed was on average below 5.0ms-1 and there was no precipitation during the survey period.

3.2. 24-hour Background Measurements

Day Time (07:00 – 19:00)	Day Time (07:00 – 19:00)	Day Time (07:00 – 19:00)	Evening (19:00 – 23:00)	Evening (19:00 – 23:00)	Evening (19:00 – 23:00)	Night Time (23:00 – 07:00)	Night Time (23:00 – 07:00)	Night Time (23:00 – 07:00)
LAmax,1h	LAeq,1h	LA90,1h	LAmax,1h	LAeq,1h	LA90,1h	LAmax,15m	LAeq,15m	LA90,15m
50 - 95 dB	39 - 68 dB	34 - 54 dB	48 - 81 dB	36 - 58 dB	32 - 41 dB	33 - 82 dB	30 - 60 dB	28 - 36 dB

3.3. Modal Analysis of Background Data

Day Time (07:00 to 19:00)	Day Time (07:00 to 19:00)	Evening (19:00 to 23:00)	Evening (19:00 to 23:00)	Night Time (23:00 to 07:00)	Night Time (23:00 to 07:00)
Standard Deviation ()	3.71	Standard Deviation ()	2.29	Standard Deviation ()	1.62
Geometric Average	45 dB	Geometric Average	36 dB	Geometric Average	31 dB
Modal Value	46 dB	Modal Value	35 dB	Modal Value	30 dB

4. Criterion…

4.1. British Standard 4142: 2014 + A1: 2019

• 4.1.1 Testing Standard… British Standard 4142: 2014 + A1: 2019 provides a method for assessing the likely effects of sound from industrial or commercial nature on “people who might be inside or outside a dwelling used for residential purposes.”
• 4.1.2 Criterion The standard provides 3-levels of impact based on the calculated Rating Levels:

“A difference of around +10 dB or more is likely to be an indication of a significant adverse impact, depending on the context. A difference of around +5dB is likely to be an indication of an adverse impact, depending on the context. Where the rating level does not exceed the background sound level, this is an indication of the specific sound source having a low impact, depending on the context.”

• 4.1.3 Feature Correction It is appropriate to add a character correction where there is a new source that cannot be measured in line with British Standard 4142: 2014 + A1: 2019. The 3 methods for approaching this are the subjective, objective, and reference methods. In this report the subjective method is used.

Section 9.2 Subjective Method	Perceptibility to noise sensitive façades	Correction
Tonality Ranging from not tonal to prominently tonal	Not tonal	+0
Tonality Ranging from not tonal to prominently tonal	Just perceptible	+2
Tonality Ranging from not tonal to prominently tonal	Clearly perceptible	+4
Tonality Ranging from not tonal to prominently tonal	Highly perceptible	+6
Impulsivity Considering both the rapidity and any overall change in sound levels<br><br>	Not impulsive	+0
Impulsivity Considering both the rapidity and any overall change in sound levels<br><br>	Just impulsive	+3
Impulsivity Considering both the rapidity and any overall change in sound levels<br><br>	Clearly impulsive	+6
Impulsivity Considering both the rapidity and any overall change in sound levels<br><br>	Highly impulsive	+9
Readily Distinctive Characteristic is neither tonal nor impulsive	Is not present	+0
Readily Distinctive Characteristic is neither tonal nor impulsive	Is present	+3
Intermittency Identifiable “on/off” conditions<br><br>	Is not present	+0
Intermittency Identifiable “on/off” conditions<br><br>	Is present	+3

4.2. Local Authority Requirements

• 4.2.1 Local Plan The Isle of Man Government Strategic Plan was fully adopted in April 2016 including Policy 22 entitled “Environment.”

“Development will not be permitted where it would unacceptably harm the environment and/or the amenity of nearby properties in terms of:

• i) pollution of sea, surface water or groundwater;
• ii) emissions of airborne pollutants; and
• iii) vibration, odour, noise or light pollution.’’

• 4.2.2 Proposed Criterion It would be recommended that the proposed noise emissions are 10 dB below the 15-minute background noise level at the nearest noise sensitive property.

5. Calculations of Noise Levels…

• 5.1. ISO 9613 – Part 2:1996 The International Standards Organisation (“ISO”) published ISO 9613 – Part 2: 1996 entitled “Acoustics – Attenuation of sound during propagation outdoors – Part 2: General method of calculations” details the corrections that are required to establish the resultant noise levels of the existing and proposed plant at the assessment position.

• 5.1.1 Source Directivity (Dc) A correction is made to account for the location of the source and the effect of additional reflective surfaces excluding the ground and is contained within section 6 of ISO 9613 - Part 2: 1996.

Number of Surfaces	Correction in dB (Dc)
1 Reflective Surface	+3 dB
2 Reflective Surfaces	+6 dB
3 Reflective Surfaces	+9 dB

• 5.1.2 Geometric Divergence (Adiv) A correction is made for the distance between the source and assessment position using the following formula defined in section 7.1 of ISO 9613-Part 2: 1996.

Formula	Symbols
Adiv = 20 . Log 10 ( d/d0) +11	Adiv = Reduction due to Geometric Divergence (dB) d = Distance from source to receiver (m) d0 = reference distance (1m)

• 5.1.3 Ground Absorption (Agr) A correction is made for the effect of the ground between the source and receiver depending on whether it is considered hard or soft ground.

Type of ground	Correction in dB (Agr)
Hard Ground	+ 3 dB
Soft Ground	+ 0 dB

• 5.1.4 Atmospheric Absorption (Aatm) As the source was less than 100m from the receiver position (assessment position) no correction was made for atmospheric absorption.

• 5.1.5 Barrier Effect (Abar) A correction is made for any barrier in the direct line of sight between the source and the assessment position and is detailed in section 7.4 of ISO 9613-Part 2: 1996. For clarity, the Kmet meteorological correction has been ignored and C2 equals 40 and C3 equals 1.

Abar = 10 . Log 10 [3 + (40 .  / ) - Ag] *Note 1

where  = a + b – r and  = c / f

Abar = Effective barrier attenuation (dB) Agr = Total Ground Absorption (dB) *Note 1: Only apply the Agr correction if Agr > 0  = Path difference (m) a = Distance from source to barrier head (m) b = Distance from barrier head to assessment position (m) r = Distance from source to assessment position (m)  = Wavelength of sound (m) c = Speed of sound – Assumed to be 342 ms-1 f = Octave band centre frequency (Hz)

• 5.2. Calculation of Plant Noise Levels

• 5.2.1 Day Time (07:00 to 19:00)

Day Time (07:00 to 19:00)	Day Time (07:00 to 19:00)	Source	ISO 9613 – Part 2: 1996 Corrections	ISO 9613 – Part 2: 1996 Corrections	ISO 9613 – Part 2: 1996 Corrections	ISO 9613 – Part 2: 1996 Corrections	ISO 9613 – Part 2: 1996 Corrections	Assessment
Ref	Description	Lw	Dc	Adiv	Agr	Aatm	Abar	Lp
1	Standard CO2 Packaged Gas Cooler	68 dB	+3 dB	-41 dB	+3 dB	-0 dB	-5 dB	28 dB
2	Standard CO2 Packaged Gas Cooler	68 dB	+3 dB	-41 dB	+3 dB	-0 dB	-5 dB	28 dB
3	Daikin VRV (30 kw)	67 dB	+3 dB	-41 dB	+3 dB	-0 dB	-5 dB	27 dB
4	Daikin VRV (30 kW)	67 dB	+3 dB	-41 dB	+3 dB	-0 dB	-5 dB	27 dB

• 5.2.2 Night Time (23:00 to 07:00)

Night Time (23:00 to 07:00)	Night Time (23:00 to 07:00)	Source	ISO 9613 – Part 2: 1996 Corrections	ISO 9613 – Part 2: 1996 Corrections	ISO 9613 – Part 2: 1996 Corrections	ISO 9613 – Part 2: 1996 Corrections	ISO 9613 – Part 2: 1996 Corrections	Assessment
Ref	Description	Lw	Dc	Adiv	Agr	Aatm	Abar	Lp
1	Standard CO2 Packaged Gas Cooler	58 dB	+3 dB	-41 dB	+3 dB	-0 dB	-5 dB	18 dB
2	Standard CO2 Packaged Gas Cooler	58 dB	+3 dB	-41 dB	+3 dB	-0 dB	-5 dB	18 dB

• 5.3. Assessment of Average Noise Levels (BS 4142: 2014 + A1: 2019)

BS 4142: 2014 Day Time - 07:00 to 19:00 Evening – 19:00 to 23:00 Night Time – 23:00 to 07:00

Residual Noise Levels	LAeq,1 hour 58 dB	LAeq,1 hour 52 dB	LAeq,15 minutes41 dB
Specific Noise Levels	LAeq,1 hour 33 dB	LAeq,1 hour 33 dB	LAeq, 15 minutes21 dB
Impulsivity Feature	+0 dB	+0 dB	+2 dB
Tonality Feature	+0 dB	+0 dB	+0 dB
Rating Noise Levels	LAeq,1 hour33 dB	LAeq,1 hour33 dB	LAeq, 15 minutes23 dB
Background Noise Levels	LA90,1 hour46 dB	LA90,1 hour35 dB	LA90, 15 minutes30 dB
BS 4142 Assessment	-13 dB (Low Impact)	-2 dB (Low Impact)	-7 dB (Low Impact)
Uncertainty (95% Confidence, k=2)	+- 1.97 dB	+- 1.83 dB	+- 1.76 dB

6. Conclusions…

• 6.1. Assessment Position The rear of the residential dwellings in Lezayre Road are located 33 m from the dedicated plant area at the side of the site.

6.2. Background Noise Measurements

Day Time (07:00 – 19:00)	Day Time (07:00 – 19:00)	Day Time (07:00 – 19:00)	Evening (19:00 – 23:00)	Evening (19:00 – 23:00)	Evening (19:00 – 23:00)	Night Time (23:00 – 07:00)	Night Time (23:00 – 07:00)	Night Time (23:00 – 07:00)
LAmax,1h	LAeq,1h	LA90,1h	LAmax,1h	LAeq,1h	LA90,1h	LAmax,15m	LAeq,15m	LA90,15m
50 - 95 dB	39 - 68 dB	34 - 54 dB	48 - 81 dB	36 - 58 dB	32 - 41 dB	33 - 82 dB	30 - 60 dB	28 - 36 dB
Modal Background	Modal Background	dB	Modal Background	Modal Background	dB	Modal Background	Modal Background	dB

• 6.3. Criterion at Assessment Position To comply with the revised version of the National Planning Policy Framework (“NPPF”) and the guidance within the Local Plan, the resultant noise levels at the nearest residential dwellings are below the underlying background noise levels when assessed in accordance with British Standard 4142: 2014 + A1: 2019.

• 6.4. Mitigation Measures It is proposed to install the standard Tesco Express packaged gas cooler at the rear of the store. It is assumed the Local Authority will accept the "low impact" assessment under BS4142: 2014 + A1: 2019..
• 6.5. Assessment of Noise Levels

Day Time (07:00 – 19:00)	Day Time (07:00 – 19:00)	Day Time (07:00 – 19:00)	Evening (19:00 – 23:00)	Evening (19:00 – 23:00)	Evening (19:00 – 23:00)	Night Time (23:00 – 07:00)	Night Time (23:00 – 07:00)	Night Time (23:00 – 07:00)
LAeq,1h	LA90,1h	BS4142	LAeq,1h	LA90,1h	BS4142	LAeq,1h	LA90,1h	BS4142
33 dB	46 dB	-13 dB	33 dB	35 dB	-2 dB	23 dB	30 dB	-7 dB

• 6.6. Conclusions The resultant noise levels from the proposed mechanical equipment will result in noise levels that comply in full with the Local Plan and are at levels that are very unlikely to give rise to complaints from residents.
• 6.7. Uncertainty

Day Time (07:00 – 19:00)	Evening (19:00 – 23:00)	Night Time (23:00 – 07:00)
+-1.97 dB (k=2, 95% Confidence)	+-1.83 dB (k=2, 95% Confidence)	+-1.76 dB (k=2, 95% Confidence)

7. Appendix A - BS 4142:2014 + A1: 2019 Information to Be Reported…

• 7.1. a) Competency

1)	Name	Role	Competency
1)	Mr. R. Scrivener	Director	Master of Science Degree in Acoustics and Noise Control (MSc) Member of the Institute of Acoustics (MIOA)

• 7.2. b) Source Under Investigation

1)<br><br>	Source Number	Description	Description	Description
1)<br><br>	Source 1	Standard CO2 Packaged Gas Cooler	Standard CO2 Packaged Gas Cooler	Standard CO2 Packaged Gas Cooler
1)<br><br>	Source 2	Standard CO2 Packaged Gas Cooler	Standard CO2 Packaged Gas Cooler	Standard CO2 Packaged Gas Cooler
1)<br><br>	Source 3	Daikin VRV (30 kw)	Daikin VRV (30 kw)	Daikin VRV (30 kw)
1)<br><br>	Source 4	Daikin VRV (30 kW)	Daikin VRV (30 kW)	Daikin VRV (30 kW)
2)<br>3)<br>4)<br>5)<br><br><br>	Description of Source	Source Location	Hours of Operation	Mode of Operation
2)<br>3)<br>4)<br>5)<br><br><br>	Source 1	Dedicated plant area at the side of the site<br><br>	24-hour	Continuously on Demand
2)<br>3)<br>4)<br>5)<br><br><br>	Source 2	Dedicated plant area at the side of the site<br><br>	24-hour	Continuously on Demand
2)<br>3)<br>4)<br>5)<br><br><br>	Source 3	Dedicated plant area at the side of the site<br><br>	07:00 - 23:00	Continuously on Demand
2)<br>3)<br>4)<br>5)<br><br><br>	Source 4	Dedicated plant area at the side of the site<br><br>	07:00 - 23:00	Continuously on Demand
2)<br>3)<br>4)<br>5)<br><br><br>	Description of Operation	Period	Conditions	Load
2)<br>3)<br>4)<br>5)<br><br><br>	All Sources<br><br>	Day Time (07:00 to 19:00)	Ambient Temp 32°C	Maximum Load (100%)
2)<br>3)<br>4)<br>5)<br><br><br>	All Sources<br><br>	Evening (19:00 to 23:00)	Ambient Temp 28°C	Part Load (60%)
2)<br>3)<br>4)<br>5)<br><br><br>	All Sources<br><br>	Night Time (23:00 to 07:00)	Ambient Temp 24°C	Part Load (40%)
2)<br>3)<br>4)<br>5)<br><br><br>	Description of Premises	It is proposed to convert the former Shoprite store to a Tesco store. The existing store occupies a detached industrial building with a dedicated customer car park at the front of the site. The rear of the residential dwellings in Lezare Road are located around 33m away from the dedicated plant area at the side of the store.	It is proposed to convert the former Shoprite store to a Tesco store. The existing store occupies a detached industrial building with a dedicated customer car park at the front of the site. The rear of the residential dwellings in Lezare Road are located around 33m away from the dedicated plant area at the side of the store.	It is proposed to convert the former Shoprite store to a Tesco store. The existing store occupies a detached industrial building with a dedicated customer car park at the front of the site. The rear of the residential dwellings in Lezare Road are located around 33m away from the dedicated plant area at the side of the store.

• 7.3. c) Subjective Impression of Source at Assessment Position

1)	Dominance	Source will not be dominant at residential facade
1)	Audibility	Source will not be audible at residential facade
2)	Residual Noise Sources	Residual noise due to local road traffic

7.4. d) Existing Contexts

1)<br><br>	Type of Receptor	Period	Sensitivity	Description
1)<br><br>	Residential	Day Time (07:00 to 19:00)	Low	Noise can disturb outside amenity space and internal living space
1)<br><br>	Residential	Evening (19:00 to 23:00)	Moderate	Noise can interrupt people trying to get to sleep
1)<br><br>	Residential	Night Time (23:00 to 07:00)	High	Noise can disturb sleeping

7.5. e) Relative Positions

1)	Assessment Position	Rear of the Residential dwellings in Lezayre Road.	Rear of the Residential dwellings in Lezayre Road.	Rear of the Residential dwellings in Lezayre Road.	Rear of the Residential dwellings in Lezayre Road.
1)	Assessment Position	BS 4142:2014 Criteria	BS 4142:2014 Criteria	Details	Compliance with Criteria
1)	Assessment Position	Section 6	Section 6	1.0m from façade (external)	Position is valid
2)	Source Measurement	The source sound power levels were supplied by the client. It is believed the sound power levels were established in accordance with BS EN 13487:2003.	The source sound power levels were supplied by the client. It is believed the sound power levels were established in accordance with BS EN 13487:2003.	The source sound power levels were supplied by the client. It is believed the sound power levels were established in accordance with BS EN 13487:2003.	The source sound power levels were supplied by the client. It is believed the sound power levels were established in accordance with BS EN 13487:2003.
2)	Justification	The client supplied the noise levels for the proposed plant.	The client supplied the noise levels for the proposed plant.	The client supplied the noise levels for the proposed plant.	The client supplied the noise levels for the proposed plant.
3)<br><br>	Background Position	It will be possible to use the standard packaged refrigeration unit, but it will be necessary to surround the plant area with an acoustic fence with a 800mm vented lower section and a solid section extending 500mm above the unit.	It will be possible to use the standard packaged refrigeration unit, but it will be necessary to surround the plant area with an acoustic fence with a 800mm vented lower section and a solid section extending 500mm above the unit.	It will be possible to use the standard packaged refrigeration unit, but it will be necessary to surround the plant area with an acoustic fence with a 800mm vented lower section and a solid section extending 500mm above the unit.	It will be possible to use the standard packaged refrigeration unit, but it will be necessary to surround the plant area with an acoustic fence with a 800mm vented lower section and a solid section extending 500mm above the unit.
3)<br><br>	Justification<br><br>	BS 4142:2014 Criteria	Details	Details	Compliance with Criteria
3)<br><br>	Justification<br><br>	Section 6.2	3.5m to any reflecting surface	3.5m to any reflecting surface	Complies
3)<br><br>	Justification<br><br>	Section 6.2	Height 1.2m to 1.5m	Height 1.2m to 1.5m	Complies
3)<br><br>	Justification<br><br>	Section 6.2	1st floor 1m to facade	1st floor 1m to facade	Not applicable
3)<br><br>	Justification<br><br>	Section 6.2<br><br>	Measurement Height	Measurement Height	3.5m
3)<br><br>	Justification<br><br>	Section 6.2<br><br>	Distance to Reflecting Surface	Distance to Reflecting Surface	1.0m
3)<br><br>	Justification<br><br>	To record remote background levels, the noise meter had to be left in a secure position. The position represented the assessment position within the constraints of the site.	To record remote background levels, the noise meter had to be left in a secure position. The position represented the assessment position within the constraints of the site.	To record remote background levels, the noise meter had to be left in a secure position. The position represented the assessment position within the constraints of the site.	To record remote background levels, the noise meter had to be left in a secure position. The position represented the assessment position within the constraints of the site.
4)	Topography, surfaces etc.	Hard and Flat	Hard and Flat	Hard and Flat	Hard and Flat
5)	Relative Distances	The plant is located approximately 33m from the assessment position.	The plant is located approximately 33m from the assessment position.	The plant is located approximately 33m from the assessment position.	The plant is located approximately 33m from the assessment position.
6)	Dimensioned sketch	See maps and images.	See maps and images.	See maps and images.	See maps and images.

7.6. f) Noise Measurement Equipment Calibration

1)	Type<br><br>	Sound Level Meter	Microphone	Calibrator
1)	Type<br><br>	KRE/06/01	KRE/06/02	KRE/06/04
2)	Manufacturer	Casella CEL 633	Casella CEL 251	Casella CEL 120/1
3)	Serial Number	2425448	00092	5230902
4)	Certificate Number	Certificate: U42920	Certificate: 42919	Certificate: U42918
4)	Calibration Due Date	10/01/2025	10/01/2025	10/01/2024

7.7. g) Noise Measurement Equipment Operation Test

1)	Ref. Level of Calibrator	94 dB
2)<br><br>	Meter Reading Before	94 dB – Meter operation checked. Meter in good working order.
2)<br><br>	Meter Reading After	94 dB - Meter operation checked. Meter in good working order.

7.8. h) Weather Conditions

1)<br><br>	Wind Speed	See weather information
1)<br><br>	Wind Direction	See weather information
2)	Temperature Inversion	Unlikely to have occurred
3)	Precipitation	None – See section 3.1
4)	Fog	None
5)	Wet Ground	Not within the measurement period – See section 3.1
6)	Frozen Ground or Snow	Not within the measurement period – See section 3.1
7)	Temperature	See section 3.1
8)	Cloud Cover	Partly Cloudy

7.9. i) Date of Measurements

1)	Source Measurements	Unknown
1)	Background Measurements	13/01/2024

7.10. j) Measurement Time Interval

1)<br><br>	Source Measurements	Tm = 15 minutes	Tm = 15 minutes
1)<br><br>	Background Measurements	Day Time (07:00 to 19:00)	Tm = 12 hours
1)<br><br>	Background Measurements	Evening (19:00 to 23:00)	Tm = 4 hours
1)<br><br>	Background Measurements	Night Time (23:00 to 07:00)	Tm = 8 hours

7.11. k) Reference Time Interval

1)	Reference Time Interval<br><br>	Day Time (07:00 to 19:00)	Tr = 1 hour
1)	Reference Time Interval<br><br>	Evening (19:00 to 23:00)	Tr = 1 hour
1)	Reference Time Interval<br><br>	Night Time (23:00 to 07:00)	Tr = 15 minutes

7.12. l) Specific Noise / m) Background Noise / n) Rating / o) Assessment / p) ConclusionsThese details are all included within the body of the report and are not replicated within this section.

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