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How is a BS4142 noise survey conducted?

The British Standard BS 4142: 2014 – Methods of rating and assessing commercial and industrial sound can be used to aid in the evaluation of noises from industrial and commercial nature. It offers ways of rating and evaluating noise of an industrial and/or commercial nature, such as:

Sound that comes from manufacturing and industrial processes
Sound produced by fixed electrical and mechanical plant and equipment. This typically comprises air conditioning units as well as extraction systems.
Sound generated by the unloading and loading of materials and goods on commercial or industrial premises
Sound produced by mobile plants and vehicles is part of the general sound that emanates from processes or premises like forklift trucks or comes from ship or train moves in the or near an industrial or commercial location.

The method for assessing industrial noise described in BS 4142 is based on the distinction between the measured background sound level, that is free of the impact on any source of industrial sound and the “rating level” for the particular industrial sound source at the receiver’s location. The BS4142:2014 says: “The significance of sound of commercial and industrial nature is dependent on the extent to which the rating level of the particular sound source is higher than what the sound levels of background, and the setting in which the sound originates”. The significance of the particular sound is determined by the ratio between the sound level of the rating in comparison to the background level taking into account the following:

“Typically the more significant this distinction is, the more significant in the force.”
“A variation of +10dB or more could be an indicator of an adversely significant impact in the right context.”
“A change of more than 5dB could be a sign of negative impact, based on the situation.”

“The less the rating level is in comparison to the background sound level and the lower the likelihood is that the particular sound source has an adverse impact or have a significant adverse effect. If the rating level is not surpass what is the level of background noise, it indicates that the particular source of sound having minimal impact in accordance with the setting.”

What is the reason you require the BS4142 the noise test?

The noise surveys in BS4142 are conducted to evaluate the effect of commercial and industrial noise sources on noise-sensitive locations. Therefore, if you’re installing equipment for plant installation outside such as extractors, air conditioning units systems, or generators in your commercial location. This Local Authority will request a Noise assessment under BS4142 to be carried out to ensure that the noise impact on the nearest sensitive building is reduced to the minimum. The BS4142 requirement also applies when you’re developing new buildings that are sensitive to noise, like apartments or houses for residential use and schools, hospitals or hotels that are in close proximity to existing commercial or industrial noise sources.

A BS4142 assessment is requested during the pre-application phase of planning permission in the event that it is determined that the Local Authority considers noise to be of sufficient risk to influence the chances of the application being granted. It could also be subject to condition in the planning permission approval. The information provided in the noise survey report permits planners and environmental health departments to determine the degree of noise impact anticipated from the development and to ensure that appropriate noise-control measures are put into put in place.

In the end, the goal for this BS4142 the noise study is make sure that the proposed development is in line to the National Planning and Policy Framework and Noise Policy Statement for England.

Common Planning Conditions?

Here are some typical planning conditions that are related to the BS4142:2014 standard:

Example 1. Prior to the initial occupation of the floorspace Class A1/A2/A3/D1 within the development which is hereby allowed details of the mechanical equipment that is required for the proposed use, as well as the proposed location of installation as well as an assessment of the noise impact that it will have, must be presented to and then approved in written form from the Local Planning Authority. The report must clearly define mitigation strategies for the development that will reduce noise-related impact at acceptable levels. The report should contain

All calculations and baseline data must be presented in a manner they can be viewed by all calculations and baseline data are clearly laid out so that the Local Planning Authority can fully review the report and critically examine the recommendations and contents. The development must be completed according to the specifications that have been approved.

2. Example 2:”The ratings level (LAeq,T) of the fixed equipment and plant related to the development, that are operating at the same time, should not exceed the noise level in the background (LA90,T) for any point when measured at the closest noisy premises. Assessments and measurements of noise must conform to the BS 4142:2014 “Rating industrial noise that affects mixed industrial and residential zones”.

In general it is generally, the Local Authority considers that new developments must contribute to and improve the region in which they are situated and, consequently, it is the Local Authority will normally define the following criteria for new developments:

The development should be planned in a way to reach an equivalence at 5dB (LAeq) lower than the standard level of background (LA90) level at the closest area that is noise sensitive’.
What can an BS4142 noise survey done?

The purpose of a noise survey BS4142 is to get an estimate of the background noise that is prevalent. The second goal is to determine the background noise.

We will conduct an assessment of the noise level in the environment to evaluate the current background noise level, minus the commercial or industrial noise source operating close to the most to the most sensitive receptor
An evaluation of the noise emissions coming from industrial noise sources under evaluation is carried out. If the source of noise isn’t yet operational Acoustic modeling will be used to determine the amount of noise emission. If the noise source is operational, measurements of noise will be made at the nearest sensitive receptor, with the source of noise active.
The impact of noise is assessed in accordance with the standard BS4142:2014. The degree at where the industrial noise is higher than the background noise level will determine the impact likely to occur.
We suggest and evaluate the appropriate mitigation measures to shield the most sensitive buildings from the ravages of noise.
We will send you an expert report to be submitted at the local authorities in order to aid in the preparation of your application for planning.

What is this technical document?

The objective of this report is to provide a concise description authorities Local Authority the level of noise impacts expected from the plans in line with BS4142:2014. It also aims to ensure that the appropriate noise-control measures are implemented. The report on noise surveys will provide the following information:

A declaration outlining the goal and goals of the report.
A thorough analysis of the development plan
An overview of the area and the sources of noise that are being evaluated
The procedure that was used to evaluate the noise levels, which includes monitoring locations as well as the equipment used information about the calibration process along with a weather summary, and the time the survey was conducted.
Summary of the results relevant to the study. These generally include LAeq,t Los Angeles Max, T, LA90, the 1/3 octave of LZeq,t.
A review of the noise levels is conducted in accordance with BS4142:2014.
Mitigation and Recommendations are required to ensure the safety of the most sensitive areas, including estimation of the expected reduction in noise due to noise-control measures.

What suggestions and mitigations are anticipated from your report on noise?

The report is expected to employ every reasonable measure to control noise to ensure that noise impacts are minimized to meet the requirements of the BS4142:2014. It is always best for noise to be managed at the source, but it isn’t always possible. These mitigation methods can be used:

The specification of low noise equipment
Distance Separation
Acoustic Barriers and Screening
Layout of Buildings and Design
Acoustic Closures
Sound Insulation Schemes
Doors and Acoustic Glazing
Alternative Strategies for Ventilation

What are you required to do?

After you’ve had you’ve had your BS4142 Noise survey done and you have received the technical report, you’ll need to go over the recommendations and make sure any changes to the layout of the project are clearly stated in the layout of your site, in detail plans and other documents. The report must be presented at the request of the council their approval and must be received in written form.

The responsibility lies with the builder to ensure that all recommendations and mitigations are put into place. The quality of workmanship and control will have a major impact on the effectiveness of noise control measures, which is why it is crucial to set an excellent standard of work to ensure proper execution of the acoustic detailing that is recommended.