November 2004 (PDF 11.6 MB) - Barrick Gold Corporation

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Table C2. Procedure for assessing meteorological effectsAlternatives forassessment1. Use existingdata todeterminemeteorologicalnoise impactrelevant to theareaProcedureAnalyse site-specific meteorological data using one of the four existing data methodsdetailed in Table C4 to determine the percentage occurrence of atmospheric stabilitycategory F 1 or G 2 temperature inversions.If the frequency of temperature inversions during the winter months is less than 30per cent of the total night-time (for inversions this is from 1 hour before sunset to 1hour after sunrise, taken to be 6 pm to 7 am), these effects are not consideredsignificant and no additional noise predictions are needed.If temperature inversions occur for 30 per cent of the total night-time or more during thewinter months, adopt the following default values to predict noise impact:Where rainfall ≥ 500 mm/yearF-class inversions• inversion: 3°C/100 m• source-to-receiver drainage-wind speed where applicable 3 : 2 m/s at 10 mheight2. Use actualmeasurementsto determinemeteorologicalnoise impactrelevant to theareaG-class inversions• inversion: 4°C/100 m• source-to-receiver drainage-wind speed where applicable 3 : 3 m/s at 10 mheightWhere rainfall < 500 mm/yearG-class inversion• inversion 8°C/100 m• source-to-receiver drainage-wind speed where applicable 3 : 1 m/s at 10 mheightApply the above meteorological parameters to the noise prediction and determine theincreased noise level.Compare the final predicted level with the project-specific noise levels to assess the noiseimpact.If the default temperature inversion and wind drift parameters are not acceptable to thedeveloper, the actual temperature inversion strength and wind speed may be measured.(See Alternative 2 below.)Measure the actual temperature inversion strength and wind speed using the ‘Directmeasurement of temperature lapse rate’ method outlined in Table C4.Use these measurements to predict noise levels and compare the prediction with theproject-specific noise levels to assess the noise impact.Notes:1. F-class stability category corresponds to moderate inversions.2. G-class stability category corresponds to strong inversions.3. The drainage-flow wind default value should generally be applied where a development is at a higheraltitude than a residential receiver, with no intervening higher ground (for example, hills).NSW industrial noise policy74
The sections below outline the procedure in detail.C2Initial screening testsThere are two tests used to determine whether thepotential for an increase in noise due to temperatureinversions warrants further assessment:• No night-time operation. As temperatureinversions are usually prominent duringnight-time hours there is no need to considertheir effects for a development that does notoperate at night.• No significant noise impacts. Whereinversion conditions are expected to increasenoise by less than 3 decibels, no furtheranalysis is required.Table C1 summarises these initial screening testprocedures.C3Determining the extent of impactTable C2 sets out the general procedure for assessinginversion effects. The procedure involves determiningthe percentage occurrence of moderate andstrong inversions during the winter season, basedon meteorological data from the locality. (Weakinversions are not included, as they are not consideredto have a significant noise impact.)Where inversions are predicted for at least 30 percent of the total time at night in the winter season(or approximately two nights per week), inversioneffects are considered to be significant and shouldbe taken into account in the noise assessment.F-class inversions are widespread in the HunterValley and hence, the F-class inversion categorymay be used as the default category for assessinginversion effects in this region as outlined in TableC3.C5Determining the potential forenhancement from temperatureinversionsThe procedure for assessing enhancement fromtemperature inversions is based on the relationshipbetween temperature inversions and the PasquillStability Categories.Table C4 summarises four different methods used todetermine the strength and frequency of temperatureinversions, based on atmospheric stabilitycategories. The first three methods may be appliedusing existing meteorological data or simple measurementtechniques to predict the frequency of aparticular atmospheric stability category. The lastmethod involves direct measurement of temperaturelapse rate and wind speed. All methods rely on aminimum of three months of weather data collectedduring the winter season (that is, the maximumlevel of impact) to determine the effect of temperatureinversions.One of these alternative methods may be used todetermine the significance of temperature inversionswhen assessing the noise impact of developmentsduring the planning and approval phase.Note that more definitive information is providedfor sites in the Hunter region. (See Section C4.)In NSW, the Hunter region has been identified as anarea significantly affected by temperature inversions.For this reason, the area has been studied indetail and, as a result, a shorter procedure fordetermining the potential for impact in the Hunterregion is outlined in Section C4.C4Identifying the extent of impact inthe Hunter regionFor sites located in the Hunter region, weather datado not need to be analysed, as the strength andfrequency of F-class temperature inversions havealready been determined for the entire region.Recent surveys have indicated that the incidence ofNSW industrial noise policy75
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Cowal Gold ProjectNoiseManagement P
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Cowal Gold Project - Noise Manageme
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For technical information about thi
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1 Policy framework1.1 Overview of t
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2. Measuring and determining existi
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Assessing intrusivenessFor assessin
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industry were sufficient to alter t
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Figure 1.2.The overall process of a
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Figure 1.4.Predicting source noise
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Figure 1.6.Negotiation process and
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has shown that it is a reasonable a
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Table 2.2. Modification to acceptab
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egory for the amenity criteria will
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activities, they also increase envi
Page 71 and 72: Table 3.1. Methods for determining
Page 73 and 74: Table 3.2. Determining the existing
Page 75 and 76: ambient noise levels can affect the
Page 77 and 78: Table 4.1.Modifying factor correcti
Page 79 and 80: 5 Meteorological conditions5.1 Intr
Page 81 and 82: which is from 10 pm to 7 am.) Winte
Page 83 and 84: around structures. At higher wind s
Page 85 and 86: eing used for a particular project.
Page 87 and 88: • employing ‘quiet’ practices
Page 89 and 90: 3. Control in transmission—the ne
Page 91 and 92: 8 Negotiation process8.1 The proces
Page 93 and 94: Features of a negotiated agreementp
Page 95 and 96: 9 Consent/licence conditionsThe pro
Page 97 and 98: 10 Applying the policy to existingi
Page 99 and 100: 11 Reviewing performanceMonitoring
Page 101 and 102: • the noise instrumentation used.
Page 103 and 104: ReferencesBerglund B. & Lindvall T.
Page 105 and 106: activities may include construction
Page 107 and 108: Spectral characteristics: The frequ
Page 109 and 110: Table A1. Assessment steps1. Do a p
Page 111 and 112: In this case, the amenity criterion
Page 113 and 114: any assessment period in any season
Page 115 and 116: In this case the intrusive criterio
Page 117 and 118: able to show that the wind-induced
Page 119 and 120: Take the background noise measureme
Page 121: Appendix C Procedure for assessing
Page 125 and 126: Appendix D Estimating noise increas
Page 127 and 128: Table E2. Step procedure for determ
Page 129 and 130: • hourly or three-hourly cloud ce
Page 131 and 132: Table E7. Aerodynamic roughness of
Page 133 and 134: Appendix FPercentage occurrence of
Page 135 and 136: 282000 1354000 20-25284000 1354000
Page 137 and 138: 394000 1362000 45-50256000 1364000
Page 139 and 140: 366000 1372000 45-50368000 1372000
Page 141 and 142: 338000 1382000 25-30340000 1382000
Page 143 and 144: 310000 1392000 20-25312000 1392000
Page 145 and 146: 282000 1402000 25-30284000 1402000
Page 147 and 148: 394000 1410000 20-25256000 1412000
Page 149 and 150: 366000 1420000 20-25368000 1420000
Page 151 and 152: 338000 1430000 15-20340000 1430000
Page 153 and 154: 310000 1440000 20-25312000 1440000
Page 155 and 156: 282000 1450000 20-25284000 1450000
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November 2004 (PDF 11.6 MB) - Barrick Gold Corporation

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