Most assessment, planning and design works begin with an acoustic survey of the existing environmental noise climate at a site. This provides a baseline level and determines the main noise sources that must be considered for the site.
Noise measurements are usually undertaken over several days and nights to understand variations in the acoustic environment and determine typical levels. These automated surveys involve the installation of one or more sound level meters in suitable external locations to log the incident sound levels. This data is then downloaded for statistical analysis and the noise measurements are summarised in a noise survey report.
Attended noise measurements may be required where a specific noise source must be observed while being measured, where a short duration measurement is sufficient or where the situation does not allow for unattended noise monitoring.
We would usually include a set of attended noise measurements when undertaking automated noise monitoring to sample the variation across the site and measure identified noise sources.