Appendix J - Peabody Energy

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7.1 PRP 12 Identification of Existing Plant with the Highest Noise As part of the PRP 12 Study, the operator-attended measurements discussed in Section 4.1, identified the existing Washery Building as the highest contributing Colliery noise source at the key dwellings located at 2 Oxley Place (O2) and 53 Parkes Street (P 53). It was also determined that the Washery Building has the highest fixed plant SWLs of 117 dBA which is emitted over a large surface area, with several existing openings and windows particularly on the southern and western facades facing the Oxley Place and Parkes Street dwellings. There is line of sight (although heavily timbered) between the upper levels of the Washery Building and some of the nearest dwellings on Oxley Place and Parkes Street, allowing the Washery’s noise emissions to propagate freely from source to receiver. Predictions of the noise contribution of other appreciable (although less significant by comparison with the Washery) Metropolitan Colliery noise sources was conducted via computer based noise modelling as a component of the PRP 12 Study. The results of the fixed and mobile plant audits are provided in Sections 6.2 and 6.3. 7.2 PRP 12 Investigation of Potential Fixed Plant Noise Controls - Existing Operation As a component of the PRP 12 Study the current fixed plant SWLs (including any existing noise controls) were compared to “technically achievable” low noise emission standards that have been demonstrated as sustainable by retrofit (rather than equipment replacement) while still reducing the noise at its source (or alternatively very near to the commencement of the noise propagation path - eg by enclosure). Technically achievable noise control or low emission benchmarks were established by researching the results of recent CHPP and mobile fleet noise reduction programmes for other mining projects and low noise materials handling technology associated with existing and approved coal handling facilities in the Port of Newcastle. The coarse washery building, pumps/compressor units, transfer conveyors and large conveyor drive assembly were all identified as potential noise reduction targets where the existing source noise was appreciably above the technically achievable low noise emission benchmarks. Of these, the enclosure of the coarse washery building utilising continuous span 0.47 millimetre (mm) Colorbond profile steel cladding (or equivalent) and 50 mm Rockwool sealed in a thin mylar film and perforated steel sheeting (or equivalent) was identified as the most potentially effective noise control measure by the PRP 12 Study. 7.3 PRP 12 Mobile Equipment Noise Controls and Management - Existing Operation As a component of the PRP 12 Study, the measured mobile equipment SWLs (including any existing noise controls) were compared to comparable equipment of similar design and operation. All items of major mobile equipment surveyed emitted SWLs within the noise emission standard by comparison with equivalent equipment with no observed irregularity. Noise reductions are technically achievable by noise control retrofitting (rather than equipment replacement) however there remains some doubt in relation to the sustainability and on-going operating performance impacts of “after market” noise control packages. Heggies Pty Ltd Report Number 10-5055-R1 Revision 0 Metropolitan Coal Project Noise Impact Assessment Helensburgh Coal Pty Ltd (10-5055R1.doc) 31 July 2008 Page 22
The PRP 12 Study concluded that while there remains potential to install noise control kits (ie high performance mufflers, acoustic louvres to radiator fan, engine dampening and track tensioning) to existing front-end loaders and tracked dozers, such measures were considered unwarranted particularly as noise arising from fixed plant sources were the major contributors at the nearest receivers. It is also technically achievable that future mobile equipment (ie replacement or upgrade) be the subject of a continuous noise improvement programme as described in Section 7.6. An example, may include future replacement or upgrade (ie at the next subcontract renewal date) to the existing offsite truck haulage fleets (ie coal reject and coking coal) where the use of new and efficient articulated vehicles are demonstrated to emit up to 6 dBA lower noise emissions by comparison with the existing fleets. 7.4 Current HCPL Noise Control Initiatives - Existing Operation In accordance with the findings of the PRP 12 Study, HCPL is currently examining the relative feasibility of a number of noise mitigation measures to reduce noise emissions from the coarse washery building. The preliminary results of this assessment and HCPL’s proposed noise mitigation measures for the coarse washery building have been included in this Project noise assessment, where relevant. A number of these measures are expected to be implemented prior to the DoP assessment of the Project Environmental Assessment and have been incorporated in the Project noise model on this basis. 7.5 Project Noise Control Measures Incorporated in the Model The Project, if approved, would provide for a further 25 years of operation at the Metropolitan Colliery. The extended life of the operation and the various surface facilities upgrade works would provide an opportunity to introduce further practicable noise controls as a component of the Project upgrades. HCPL would implement a range of noise controls and/or purchase replacement low noise equipment and implement a continuous noise improvement programme to reduce noise emissions at the Metropolitan Colliery. The timing of the implementation of the noise controls would be dependant on the actual progressive development of the Project and the measures would be implemented in order to facilitate compliance with relevant noise specifications. Specific fixed plant and mobile equipment noise control measures incorporated in the model to meet specified SWL emissions and/or modelled levels at the nearest private receptors include: • Enclosure of the coarse washery building (HCPL has commenced aspects of this work). • The Project CHPP upgrade to include the installation of modern low-noise equipment where practicable, and/or additional sound insulation, or specific mitigation of key noise sources (eg drives). • Replacing existing exhaust silencers on pumps and compressors with high performance mufflers. • Relocating or enclosing the MD1 conveyor drive fan as a component of Project conveyor upgrades. • Partial enclosure or construction of a nearfield barrier to the south/west of the MD1 conveyor drive as part of Project conveyor upgrades. • Implementation of a low noise conveyor idler replacement system on surface transfer conveyors as a component of Project conveyor upgrades. • Enclosure of the new paste backfill plant to minimise noise emissions. Heggies Pty Ltd Report Number 10-5055-R1 Revision 0 Metropolitan Coal Project Noise Impact Assessment Helensburgh Coal Pty Ltd (10-5055R1) 31 July 2008 Page 23
Page 1 and 2: APPENDIX J METROPOLITAN COAL PROJEC
Page 3 and 4: Metropolitan Coal Project Noise Imp
Page 5 and 6: TABLE OF CONTENTS 11 OFF-SITE TRANS
Page 7 and 8: 1 INTRODUCTION 1.1 Assessment Requi
Page 9 and 10: • HCPL to implement a continuous
Page 11 and 12: Table 2 Current and Proposed Hours
Page 13 and 14: Table 3 Nearest Potentially Affecte
Page 15 and 16: Table 5 Atmospheric Stability Frequ
Page 17 and 18: Table 8 Unattended Background Noise
Page 19 and 20: 4.4 Ambient Traffic Noise Monitorin
Page 21 and 22: Ideally, the intrusive noise emissi
Page 23 and 24: 5.4 Noise Impact Assessment Methodo
Page 25 and 26: Table 16 Fixed Plant Noise Audit -
Page 27: 6.5 Project Noise Model Scenarios T
Page 31 and 32: 7.6 Continuous Noise Improvement Pr
Page 33 and 34: Existing Metropolitan Colliery Nois
Page 45 and 46: Table 27 Predicted Distance Require
Page 47 and 48: Table 31 Peak Hourly Existing and P
Page 49 and 50: Table 34 Midweek Existing and Cumul
Page 51 and 52: Table 38 Predicted Train Generated
Page 53 and 54: • Negligible noise level increase
Page 55 and 56: HCPL would implement a range of noi
Page 57 and 58: Similarly, ground vibration levels
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Appendix J - Peabody Energy

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