November 2004 (PDF 11.6 MB) - Barrick Gold Corporation

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Cowal Gold Project – Noise Management Plan• construction of the 132 kV electricity transmission line (within the ML);• upgrading of the access road from West Wyalong; and• fabrication and erection of the processing plant.5.1.1 Construction Noise ImpactsModelling of noise emission levels at nearby residences and bird breeding areas was conductedassuming concurrent operation of all items of mobile equipment (Section 5.2.2) under neutralmeteorological conditions (ie. 20°C, 70% relative humidity, 0°C/100 metres (m) temperature gradientand 0 metres per second (m/s) wind speed) (Richard Heggie Associates, 1997). Noise emission levelsunder adverse conditions, including a 3°C/100 m temperature inversion and 1.5 m/s wind speed, werealso modelled. The following sections outline the results of noise emission modelling duringconstruction for both nearby dwellings and bird breeding areas.DwellingsThe predicted L A10 noise contributions for typical activities during the construction phase are presentedin Table 6.Table 6Predicted L A10 Noise Contribution – ConstructionDwelling NameNeutralMeteorologicalConditions (dBA)3 o C/100 mInversion (dBA)1.5 m/s Wind(dBA)Intrusive Criteria 1LA 10 (15 minute)dB(A)Day (7am to 10pm)Intrusive Criteria 1LA 10 (15 minute)dB(A)Night (10pm to7am)Coniston 16 24 26 35 33Lakeside* 20 22 25 35 33Lake Cowal* 16 24 25 35 33Gumbelah 19 20 21 35 33After: Richard Heggie Associates, 1997* denotes Barrick-owned dwelling1Refer to Consent Condition 6.4(a) and Table 1Table 6 indicates that at all the closest dwellings, the predicted noise levels comply with the daytimeand night-time level criteria (Table 1) under neutral and adverse conditions.Bird BreedingLake Cowal is a recognised bird habitat for many species that congregate when conditions aresuitable. Bird breeding predominantly occurs in a restricted area of remnant Red Gum and Lignumhabitat at the north of Lake Cowal with feeding extending to Nerang Cowal. The main breeding areasare more than 4 km away from the Project area (Richard Heggie Associates, 1997).Project noise levels under adverse conditions (1.5 m/s wind) were predicted at various distances fromthe edge of Lake Cowal closest to future activity during the construction phase. The results of thisanalysis are presented in Table 7.HAL-02-07/1/NMP01-P/17/11/04 12 BARRICK
Cowal Gold Project – Noise Management PlanTable 7L Amax Noise Levels across Lake Cowal - ConstructionProject PhaseDistance From Lake Edge Closest to Construction ActivityL Amax Noise Level (1.5 m/s wind) - dBA1.5 km 2 km 4 km 5.5 km 6 km 7 km 10 kmConstruction (Year -1) 53 44 35 29 30 26 25After: Richard Heggie Associates, 1997Birds tend to habituate to constant steady noise levels, even of a relatively high level in the order of70 dBA (Richard Heggie Associates, 1997). Table 7 indicates that the maximum noise levels underadverse weather conditions at the closest monitored area at Lake Cowal would be 53 dBA duringconstruction (Richard Heggie Associates, 1997). This is below the level of 70 dBA, above which somedegree of environmental changes in birds have been observed (Richard Heggie Associates, 1997).Monitoring of potential noise impacts on bird breeding is discussed in Section 8.5.1.2 Monitoring Construction NoiseNoise levels during peak construction periods will be monitored at the following locations, as agreedwith NPWS (NPWS, pers. comm., 21 May 2003):• NO1 - New Lake foreshore;• NO2 - ‘Coniston’ residence;• NO3 - bird breeding area;• NO4 - bird breeding area;• NO5 - ‘Gumbelah’ residence; and• NO6 - ‘Lake Cowal’ residence.Section B1.2 of Appendix B of the INP (Appendix A) describes procedures for unattended long-termmonitoring of noise. Procedures that could be adopted are as follows:1. Field-calibrate the noise monitoring equipment.2. Monitor the background noise and meteorological conditions continuously for each day of theweek that the development will be operating and over the proposed operating hours, using theL A90(15 minute) descriptor.3. Note the dominant and background noise sources present at the site throughout the monitoringperiod.4. Check the field calibration at the conclusion of the monitoring period in accordance withAS 1259.1 (now superseded by AS IEC 61672.1-2004 [Appendix D] and AS IEC 61672.2-2004,[Appendix E]) and AS 2659.1 (Appendix F) to ensure that any calibration drift is allowed byrelevant Australian Standards.5.2 IMPACTS DURING OPERATION PHASE5.2.1 Hours of OperationThe hours of mining and processing operations will be 24 hours per day, Monday to Sunday (RichardHeggie Associates, 1997).HAL-02-07/1/NMP01-P/17/11/04 13 BARRICK
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activities, they also increase envi
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Table 3.1. Methods for determining
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Table 3.2. Determining the existing
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ambient noise levels can affect the
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Table 4.1.Modifying factor correcti
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5 Meteorological conditions5.1 Intr
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which is from 10 pm to 7 am.) Winte
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around structures. At higher wind s
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eing used for a particular project.
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• employing ‘quiet’ practices
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3. Control in transmission—the ne
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8 Negotiation process8.1 The proces
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Features of a negotiated agreementp
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9 Consent/licence conditionsThe pro
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10 Applying the policy to existingi
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11 Reviewing performanceMonitoring
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• the noise instrumentation used.
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ReferencesBerglund B. & Lindvall T.
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activities may include construction
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Spectral characteristics: The frequ
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Table A1. Assessment steps1. Do a p
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In this case, the amenity criterion
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any assessment period in any season
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In this case the intrusive criterio
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able to show that the wind-induced
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Take the background noise measureme
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Appendix C Procedure for assessing
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The sections below outline the proc
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Appendix D Estimating noise increas
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Table E2. Step procedure for determ
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• hourly or three-hourly cloud ce
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Table E7. Aerodynamic roughness of
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Appendix FPercentage occurrence of
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282000 1354000 20-25284000 1354000
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394000 1362000 45-50256000 1364000
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366000 1372000 45-50368000 1372000
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310000 1392000 20-25312000 1392000
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282000 1402000 25-30284000 1402000
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394000 1410000 20-25256000 1412000
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310000 1440000 20-25312000 1440000
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November 2004 (PDF 11.6 MB) - Barrick Gold Corporation

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