Noise and Air Quality Impact Assessment W D Milligan 31 July 2014

                                                                          MWA Environmental




2.3 NOISE MODELLING
    2.3.1 METHODOLOGY

    To enable assessment of noise from the proposed poultry farm, a detailed noise
    model has been established using the SoundPLAN 7.3 software applying the
    ISO9613 standard. This model is an accepted regulatory model that allows input
    of terrain specific data and source noise data as sound power level spectra.

    The model was established over an area of 5.5km x 5.5km including the subject
    site and the surrounding sensitive receptors. The terrain within the model domain
    was derived from 3 arc-second NASA Shuttle Radar Topography Mission
    (SRTM) digital elevation data.

    The noise modelling undertaken considered meteorological conditions as per the
    methodology of the ISO9613 standard, with a temperature of 10 degrees Celsius2
    and 70% humidity, a temperature inversion and the following wind conditions as
    per the worst-case assumptions of ISO9613:




    As such, given the above meteorological assumptions, it is considered that the
    results of the noise modelling represent the resultant noise levels of the proposed
    development during worst-case noise propagation conditions.

    The SoundPLAN 7.3 model was setup to represent noise emissions from the
    following scenarios representing continuous ventilation fan noise and intermittent
    catch-out and feed delivery noise:




2 Aside from ambient temperature modelled at 25 degrees Celsius for the ventilation fans during
‘high ambient temperature’ scenario


Ridgewood 12-002                              8                                   31 July 2014