Environmental Noise Report · MCU13/0064

4 Noise Modelling
The environmental noise model was configured using the CadnaA noise prediction software
(DataKustik, 2013) with calculations based on ISO 9613 ‘Acoustics — Attenuation of sound during
propagation outdoors’ algorithms.

The noise modelling takes into consideration the activity and equipment sound power levels of the
industrial operations to the southeast of the site and includes adjustments for attenuation from
geometric spreading, acoustic shielding from intervening ground topography, ground effect and
atmospheric absorption. The algorithm is inherently conservative, representing enhanced noise due
to moderate downwind conditions.

The following information was used in the setup of the noise model:

         Topographic survey of the site was taken from SCRC online mapping system.
         Building locations were taken from aerial photography from SCRC online mapping system.

Information regarding site operations was obtained during a site visit conducted on Friday 14 June
2013. The noise sources identified during the site visit and their estimated sound power levels (L WA)
based on onsite measurements are presented in Table 4.1. Operational hours were based on
information supplied by Makepeace as shown in Table 1.1. Small condenser units are located under
each bungalow. These are well shielded by blockwork walls to the nearest sensitive receiver and are
not considered further.

                                   Table 4.1: Site Mechanical Plant and Equipment
Noise Sources                           Location                             Hours of Operation    Est. LWA
Air conditioning condenser 10 kW         A single condenser located outside    Anytime             78
                                         each bungalow and caretakers
                                         residence.
Mains booster water pump                 Located near WWTP                     During peak water   66
                                                                               demand, morning
                                                                               and evening
WWTP (submerged pumps and                South of Villa (approximately 10 m)   Anytime             70
aerators)
Kitchen Exhaust Fan                      Eastern side of central building      Anytime             80
Wasp Diesel 110 kVA Model                Located near WWTP                     Emergency only      87
#WDJD110




0023-R1-01 KHA Makepeace Island Noise Impact Assessment Report                                                11
Report
Makepeace Island (Operations) Pty Ltd | 0023