**Document:** APL Noise Impact Assessment **Application:** 24/91007/B — Installation of refrigeration and Gas Coolers with an acoustic close boarded fence erected around **Decision:** Application Withdrawn **Decision Date:** 2025-02-24 **Parish:** Lezayre **Document Type:** report / planning_statement **Source:** https://planningportal.im/a/33036-lezayre-supermarket-bowring-road-fence/documents/1578024 --- # 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

|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

|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… ![A bar and line chart displaying average hourly wind speed, wind gusts, and wind direction data for January 2024.](https://images.planningportal.im/2024/08/7038662.png) - 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 ![The image displays three bar charts showing noise level counts (L90) across different time periods (Day, Evening, Night) measured in decibel bands.](https://images.planningportal.im/2024/08/7038665.png) |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

|Not impulsive|+0| |Impulsivity Considering both the rapidity and any overall change in sound levels

|Just impulsive|+3| |Impulsivity Considering both the rapidity and any overall change in sound levels

|Clearly impulsive|+6| |Impulsivity Considering both the rapidity and any overall change in sound levels

|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

|Is not present|+0| |Intermittency Identifiable “on/off” conditions

|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)

|Source Number|Description|Description|Description| |---|---|---|---|---| |1)

|Source 1|Standard CO2 Packaged Gas Cooler|Standard CO2 Packaged Gas Cooler|Standard CO2 Packaged Gas Cooler| |1)

|Source 2|Standard CO2 Packaged Gas Cooler|Standard CO2 Packaged Gas Cooler|Standard CO2 Packaged Gas Cooler| |1)

|Source 3|Daikin VRV (30 kw)|Daikin VRV (30 kw)|Daikin VRV (30 kw)| |1)

|Source 4|Daikin VRV (30 kW)|Daikin VRV (30 kW)|Daikin VRV (30 kW)| |2)
3)
4)
5)


|Description of Source|Source Location|Hours of Operation|Mode of Operation| |2)
3)
4)
5)


|Source 1|Dedicated plant area at the side of the site

|24-hour|Continuously on Demand| |2)
3)
4)
5)


|Source 2|Dedicated plant area at the side of the site

|24-hour|Continuously on Demand| |2)
3)
4)
5)


|Source 3|Dedicated plant area at the side of the site

|07:00 - 23:00|Continuously on Demand| |2)
3)
4)
5)


|Source 4|Dedicated plant area at the side of the site

|07:00 - 23:00|Continuously on Demand| |2)
3)
4)
5)


|Description of Operation|Period|Conditions|Load| |2)
3)
4)
5)


|All Sources

|Day Time (07:00 to 19:00)|Ambient Temp 32°C|Maximum Load (100%)| |2)
3)
4)
5)


|All Sources

|Evening (19:00 to 23:00)|Ambient Temp 28°C|Part Load (60%)| |2)
3)
4)
5)


|All Sources

|Night Time (23:00 to 07:00)|Ambient Temp 24°C|Part Load (40%)| |2)
3)
4)
5)


|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)

|Type of Receptor|Period|Sensitivity|Description| |---|---|---|---|---| |1)

|Residential|Day Time (07:00 to 19:00)|Low|Noise can disturb outside amenity space and internal living space| |1)

|Residential|Evening (19:00 to 23:00)|Moderate|Noise can interrupt people trying to get to sleep| |1)

|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)

|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)

|Justification

|BS 4142:2014 Criteria|Details|Details|Compliance with Criteria| |3)

|Justification

|Section 6.2|3.5m to any reflecting surface|3.5m to any reflecting surface|Complies| |3)

|Justification

|Section 6.2|Height 1.2m to 1.5m|Height 1.2m to 1.5m|Complies| |3)

|Justification

|Section 6.2|1st floor 1m to facade|1st floor 1m to facade|Not applicable| |3)

|Justification

|Section 6.2

|Measurement Height|Measurement Height|3.5m| |3)

|Justification

|Section 6.2

|Distance to Reflecting Surface|Distance to Reflecting Surface|1.0m| |3)

|Justification

|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

|Sound Level Meter|Microphone|Calibrator| |---|---|---|---|---| |1)|Type

|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)

|Meter Reading Before|94 dB – Meter operation checked. Meter in good working order.| |2)

|Meter Reading After|94 dB - Meter operation checked. Meter in good working order.| ### 7.8. h) Weather Conditions |1)

|Wind Speed|See weather information| |---|---|---| |1)

|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)

|Source Measurements|Tm = 15 minutes|Tm = 15 minutes| |---|---|---|---| |1)

|Background Measurements|Day Time (07:00 to 19:00)|Tm = 12 hours| |1)

|Background Measurements|Evening (19:00 to 23:00)|Tm = 4 hours| |1)

|Background Measurements|Night Time (23:00 to 07:00)|Tm = 8 hours| ### 7.11. k) Reference Time Interval |1)|Reference Time Interval

|Day Time (07:00 to 19:00)|Tr = 1 hour| |---|---|---|---| |1)|Reference Time Interval

|Evening (19:00 to 23:00)|Tr = 1 hour| |1)|Reference Time Interval

|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. ### END OF REPORT (1st and last page not numbered) ## --- *Data sourced from the Isle of Man public planning register under the [Isle of Man Open Government Licence](https://www.gov.im/about-this-site/open-government-licence/).* *Canonical page: https://planningportal.im/a/33036-lezayre-supermarket-bowring-road-fence/documents/1578024*