Warrawee Substation - Review of Environmental Factors

Warrawee Substation Page 10Operational Noise & Construction Noise & Vibration AssessmentReport No. 11332 Version B5 OPERATIONAL NOISE ASSESSMENT5.1 Noise SourcesTo assist with the assessment of the operational noise from Warrawee Substation, attendedmeasurements were conducted at West Ryde Substation, West Parade, Denistone. It isunderstood that the plant / equipment used at this substation and the basic layout is similar tothe proposed design for Warrawee Substation.Figure 5-1 provides an image of the measurement location outside the substation building.Figure 5-1View of Transformer with Brick Wall Barrier at West Ryde SubstationBunded Yard withTransformerSolid BrickWall BarrierAttended measurements were conducted on 13 January 2012 using a Bruel and KjaerType 2250 Sound Level Meter. This sound level meter conforms to Australian Standard 1259Acoustics - Sound Level Meters as a Type 1 Precision Sound Level Meter which has accuracysuitable for field and laboratory use. The A-Weighting filter of the meter was selected and thetime weighting was set to “Fast”. The calibration of the meter was checked before and afterthe measurements with a Bruel and Kjaer Type 4231 sound level calibrator and no significantdrift was noted.The Bruel and Kjaer Type 2250 and Type 4231 have been laboratory calibrated within theprevious two years in accordance with our in-house Quality Assurance Procedures.Figure 5-2 shows an illustration of the measurement locations.