APPENDIX I: Noise Monitoring Data - Xstrata Coal Mangoola

3 METHODOLOGY
3.1 Attended Noise Monitoring
Attended monitoring was conducted in accordance with OEH ‘Industrial Noise Policy’ (INP)
guidelines and Australian Standard AS 1055 ‘Acoustics, Description and Measurement of
Environmental Noise’. Atmospheric condition measurement was also undertaken. The
duration of each measurement was 15 minutes.
Attended monitoring is preferred to the use of noise loggers when determining compliance
with prescribed limits; it allows an accurate determination of the contribution, if any, to
measured noise levels by the source of interest (in this case Mangoola Coal).
The equipment detailed in Table 3.1 was used to measure environmental noise levels.
Table 3.1 ATTENDED NOISE MONITORING EQUIPMENT
Model Serial Number Calibration Due Date
Rion NA-28 sound level analyser 01070590 09/11/2013
Pulsar acoustic calibrator 57413 21/09/2013
Calibration certificates are provided in Appendix B.
Meteorological data was obtained from Mangoola Coal meteorological stations. This allowed
correlation of atmospheric parameters and measured noise levels. Sigma theta is used to
calculate vertical temperature gradient (VTG) in accordance with procedures detailed in the
INP.
Met data used in this report was sourced from Mangoola Coal’s north and south
meteorological stations and is provided in Appendix C.
As indicated in the notes below condition 3, Schedule 3 of the project approval, modifying
factors from Section 4 of the INP should be implemented where applicable. Tonality and low
frequency from Mangoola Coal were assessed by analysis of the measured L Aeq spectrum.
Years of monitoring have indicated that noise levels from mining operations, particularly
those levels measured at significant distances from the source are relatively continuous.
Given this, noise levels from Mangoola Coal at the monitoring locations are unlikely to be
intermittent. In addition, there is no equipment on site at Mangoola Coal that would generate
impulsive noise as defined in the INP. However, low frequency noise from Mangoola Coal
has been addressed.
The terms “Inaudible” (IA) and “less than 25 dB” (