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Noise Impact Assessment

Do you require a noise impact report, if so then please contact Southwest Environmental for a quotation.

During construction their will normally be an increase in noise, which can impact on neighbors.

Some developments will have a negative noise impact, as they may replace older developments with a higher noise footprint one example of this might be the redevelopment of a dockyard to seafront residential apartments.

In most cases there will be an positive noise impact, new roads, wind farms and industrial centers will all generally create more noise than the previous site use.

Noise is considered as a form of pollution and as such any "noise" component of an environmental impact assessment will include:

- Baseline studies
noise impact assessment

- Impact Prediction

- Mitigation

- Monitoring

Picking up on one of the above point. Mitigation.

Mitigation of noise can be accomplished in an umber of ways, one such way is to control the noise at source, this might include fitting larger silencers to motorised plant, or the specialize detuning, of outlets etc.

Noise Impact Modeling

noise_impact_modelling Noise Impact Modeling is is a a critical part of the noise impact assessment process.

Noise impact baseline studies must be prepared, but then it is necessary to derive a post development figure for noise at a particular location.

The sound level must be considered along with barriers, that may attenuate sounds on its path to the receptpr.

Receptors for noise can be humans, and natural. Amenity areas should therefore be considered that offer a degree of tranquility.


Dependent on the level of detail required within the model noise modeling can be a relatively simple, or extremely complex affair.

noise_impact_assessement

FAQS for Noise and Vibration Impact

Below discussed are some common ideas that relate to the measurement of Noise & Vibration, and their impacts. In order to keep this description simple this guide strays from official guidance and should be considered as an introductory note only.

What are Noise and Vibration?

Noise (Unwanted Sound) and Vibration are both vibrations. Noise is a vibration that we can hear, whilst “vibration” we feel.

How are Noise and Vibration Measured?

Monitoring equipment is used to record sound levels. A microphone is used and any sound is recorded and the “volume” recorded. The results are recorded in decibels (dB). Vibration is measured using an accelerometer. This measures movement in 3 different directions (up-down, side to side and forward-backwards). Results are presented in mm/s that is a measure of movement over time.

What are the Trigger Limits for Vibration?

For people there is no limit as such, although 10mm/s is thought to be “intolerable”. However, humans all differ and some may tolerate more vibration, and some less. We would typically consider a vibration level of 5 mm/s as a trigger level where residents should be protected. For a building the trigger levels differ depending on the strength of the building. But past 15mm/s investigations should be made, to try and reduce vibrations affecting the building. sound_levels_table

What is the Trigger Level for Noise?

Noise limits are different to vibration in that there is normally background noise, which louder noises have to overcome in order to be a nuisance. For example talking loudly in a quiet library will disturb people nearby, whilst talking loudly at a football match; you may not even be heard.  With noise we typically measure a back ground (or baseline) level and then add 5dB on top of this to give a Trigger level.

 How do Sound and Vibration Travel?

The travel path is the path the sound takes from the source (digger) to the receiver (ear). Outdoor barriers can block travel paths, for example traffic noise. The effectiveness of barriers is dependent on factors such as its distance from the noise source and the receiver, its height and construction.

 

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