Appendix J - Peabody Energy

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Table 25 Daytime, Evening and Night-time Blast Emission Assessment Criteria Time of Blasting 5% Exceedance Airblast Level (dB Linear) Monday to Saturday 9.00 am - 5.00 pm 115 5 Monday to Saturday 5.00 am - 9.00 am 105 2 and 5.00 pm - 8.00 pm Sunday, Public Holidays 6.00 am - 8.00 pm 95 1 Any Day 8.00 pm - 6.00 am 95 1 5% Exceedance PPV Ground Vibration (mm/s) 10.2 Excavation Blast Design and Prediction Methodology As discussed in Section 1.1, use of explosives is not required for general underground coal mining. Occasionally the continuous miner encounters geological structures that are broken up by using very low explosive masses. An assessment of the potential vibration and airblast emissions arising from the underground excavation blasting has been based on the typical blast design parameters presented in Table 26. Table 26 Typical Underground Excavation Blast Design Parameters Blast Design Parameter Typical Dimension Pull 3 m Holes per Delay 5 holes Hole Diameter 38 mm Explosive Type (Mass) Powergell (1 kilogram per metre [kg/m]) Total Explosive Mass 50 kilograms (kg) Maximum Instantaneous Charge (MIC) 10 kg Powder Factor 0.80 kilogram per cubic metre (kg/m 3 ) By adopting the anticipated excavation blast design parameters, the vibration and airblast emissions can be predicted using the relevant vibration and airblast formula presented in AS 2187.2-2006. Airblast emission arising from underground blasting would propagate from the excavation site and release to the surface via the nearest ventilation shafts. But before reaching the surface, airblast noise is attenuated due to underground confinement and a conservative 25 dB loss has been assumed for this assessment. The relevant formulae are as follows: PVS = 3,272 (R/Q 1/2 ) -1.60 dBLpk = 148.4 - 24(log10R - log10Q) where, PVS = mm/s dBLpk = Peak airblast dBLinear inclusive of 25 dB attenuation due to underground confinement R = Distance between charge and receiver (m) Q = Charge mass per delay (kg) 10.3 Underground Excavation Blast Emissions Prediction The standard formulae have been used to predict vibration and airblast emissions as presented in Table 27. 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 38
Table 27 Predicted Distance Required to Achieve Blast Emission Criteria Period Airblast Distance Vibration Distance Daytime 115 dBLpk 155 m 5 mm/s 180 m Evening 105 dBLpk 140 m 2 mm/s 320 m Night-time 95 dBLpk 360 m 1 m/s 500 m Based on the foregoing, airblast emissions arising from underground excavation blasting are predicted to meet the most stringent night-time criteria of 95 dBLpk at a distance of 360 m from the nearest ventilation shaft. As there are no residential dwellings located within 360 m from the proposed Ventilation Shaft No 4, airblast noise impacts are likely to be minimal (which is consistent with the with existing Metropolitan Colliery excavation blasting practices). Similarly, ground vibration levels are predicted to meet the most stringent night-time criteria of 1 mm/s at a distance of 500 m from the blast site. As all excavation blasting is conducted at least 400 m below the surface, vibration impacts are also likely to be minimal (which is also consistent with the existing Metropolitan Colliery excavation blasting practices and experience). 11 OFF-SITE TRANSPORT 11.1 Road Transport Traffic Noise Criteria Based on the ECRTN dated May 1999, Lawrence Hargrave Drive is classified as a “sub-arterial road” and Parkes Street as a “collector”, road. The applicable noise criteria are presented in Table 28. The traffic noise monitoring was conducted to establish the existing traffic noise environment inclusive of the existing Metropolitan Colliery operations and summarised in Section 4.4. The existing total traffic noise levels generally already exceed the relevant criteria at nominal off-set distance of 30 m from Lawrence Hargrave Drive and 15 m from Parkes Street, Helensburgh. Table 28 NSW Environmental Criteria for Road Traffic Noise Receiver Area Road Policy Descriptor 1 Traffic Noise Goal (dBA) Helensburgh Note 1: Lawrence Hargrave Drive Parkes Street Land use developments with the potential to create additional traffic existing on sub-arterials Land use developments with the potential to create additional traffic existing on collector roads Daytime 0700 hours to 2200 hours, Night-time 2200 hours to 0700 hours. Daytime LAeq(15hour) Night-time LAeq(9hour) Daytime LAeq(1hour) Night-time LAeq(1hour) Note that in all cases where the nominated criteria are already exceeded, traffic associated with new development should not be permitted to lead to an increase in the existing noise traffic levels of more than 2 dBA. This can be achieved when the Project related percentage increase in existing light and heavy vehicle movements is no greater than 60%. 60 55 60 55 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 39
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 and 28: 6.5 Project Noise Model Scenarios T
Page 29 and 30: The PRP 12 Study concluded that whi
Page 31 and 32: 7.6 Continuous Noise Improvement Pr
Page 33 and 34: Existing Metropolitan Colliery Nois
Page 43: Existing Metropolitan Colliery Nois
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
Page 59: Appendix A1 Report 10-5055-R1 Page
Page 62 and 63: Initial Development Schedule Projec
Page 64 and 65: LARGE COAL CIRCUIT ROM Bin Dump Hop
Page 66 and 67: Zoning LEGEND Coal Lease Boundary M
Page 68 and 69: Appendix E1 Report 10-5055-R1 Page
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Page 72 and 73: Appendix F1 Report 10-5055-R1 Page
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Appendix F2 Report 10-5055-R1 Page
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Appendix G1 Report 10-5055-R1 Page
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Appendix H Report 10-5055-R1 Page 1
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6 217 000 N 35 314 000 E 315 000 E
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Appendix J - Peabody Energy

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