Monitoring for compliance with the noise emission conditions of an IPPC or Waste Licence should be primarily based upon International Standard ISO 1996: Acoustics – Description, Measurement and Assessment of Environmental Noise.
Ideally, sampling over different days and at different times during the day will help to ensure that the survey is statistically representative. However, there are many practical constraints militating against this. Where noise emissions are relatively steady, a series of measurements should be undertaken as set out below.
The sampling period is determined in the EPA license for the site.