Appendix 12 Noise Study
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APPENDIX 12 NOISE STUDY (2013) ENVIRONMENTAL NOISE ASSESSMENT FOR THE PROPOSED VENTERSBURG GOLD MINE GOLD ONE AFRICA LTD 29/11/2012 _________________________________________________ Digby Wells & Associates (Pty) Ltd. Co. Reg. No. 1999/05985/07. Fern Isle, Section 10, 359 Pretoria Ave Randburg Private Bag X10046, Randburg, 2125, South Africa Tel: +27 11 789 9495, Fax: +27 11 789 9498, [email protected], www.digbywells.com _________________________________________________ Directors: A Sing, AR Wilke, LF Koeslag, PD Tanner (British)*, AJ Reynolds (Chairman) (British)*, J Leaver*, GE Trusler (C.E.O) *Non-Executive _________________________________________________ Environmental Noise Impact Assessment for the proposed Ventersburg Gold Mine GOL1675 This document has been prepared by Digby Wells Environmental . Report Title: Environmental Noise Impact Assessment for the proposed Ventersburg Gold Mine Project Number: GOL1675 Name Responsibility Signature Date Lukas Sadler Report writer 28/11/12 Bradly Thornton 1st review 29/11/2012 This report is provided solely for the purposes set out in it and may not, in whole or in part, be used for any other purpose without Digby Wells Environmental prior written consent. ii Environmental Noise Impact Assessment for the proposed Ventersburg Gold Mine GOL1675 EXECUTIVE SUMMARY Gold One Africa Ltd (Gold One) has recently completed a Pre-Feasibility Study (PFS) for a potential new gold mine and plant at its Ventersburg Project area. The feedback from the PFS has resulted in Gold One choosing to move into a Bankable Feasibility Study (BFS). As part of the BFS, Gold One wish to gather the required information in order to compile a variety of legal authorisation processes. Digby Wells Environmental (Digby Wells) was commissioned by Gold One to conduct an environmental noise assessment in support of the BFS. This environmental noise assessment report forms part of the BFS report and entails the following tasks: ■ Identification of noise sources and potential noise sensitive receivers; ■ Establishment of the existing noise climate at various locations in the project area and directly adjacent areas through the undertaking of baseline noise measurements; and ■ Assessment of the anticipated noise impacts associated with the project activities during the construction, operational, decommissioning and post-closure phases. In terms of the baseline conditions, it is gathered that the existing ambient noise levels in the immediate area are typical that of rural surroundings, except for the noise levels at the town of Phomolong. The town of Phomolong should be considered an urban district, thus the ambient soundscape for all receivers within Phomolong must be considered as urban when considering the rating level. The remaining receivers in the study area must be considered as rural when considering the rating level of the area. From the study it is concluded that the proposed Ventersburg Gold Mine will impact on the night time ambient noise levels at receptor R1 during the operational phase. It is expected that the noise will only slightly measure above the ambient noise levels at the mentioned receptor. The impact therefore has a medium-low significance rating. iii Environmental Noise Impact Assessment for the proposed Ventersburg Gold Mine GOL1675 TABLE OF CONTENTS 1 INTRODUCTION .............................................................................................................. 1 2 TERMS OF REFERENCE ................................................................................................ 1 3 STUDY AREA ................................................................................................................... 1 4 EXPERTISE OF THE SPECIALIST .................................................................................. 1 5 AIMS AND OBJECTIVES ................................................................................................. 1 6 METHODOLOGY.............................................................................................................. 2 7 BASELINE RESULTS AND DISCUSSIONS .................................................................... 8 8 FINDINGS ....................................................................................................................... 16 9 IMPACT ASSESSMENT ................................................................................................. 21 10 CUMULATIVE IMPLACTS .............................................................................................. 26 11 RECOMMENDATIONS .................................................................................................. 27 12 MITIGATION MEASURES AND MANAGEMENT PLAN ................................................ 27 13 MONITORING PLAN ...................................................................................................... 29 14 STUDY SUMMARY ........................................................................................................ 30 15 CONCLUSION ................................................................................................................ 30 16 REFERENCES ............................................................................................................... 30 LIST OF FIGURES Figure 7-1: Noise time history graph for N1 .......................................................................................... 11 Figure 7-2: Noise time history graph for N2 ......................................................................................... 12 Figure 7-3: Noise time history graph for N3 .......................................................................................... 13 Figure 7-4: Noise time history graph for N4 .......................................................................................... 14 Figure 8-1: Noise dispersion from the construction phases. ................................................................. 18 Figure 8-2: Noise dispersion during the operational phase .................................................................. 20 LIST OF TABLES Table 6-1: Acceptable rating levels for noise in districts (SANS 10103, 2008) ...................................... 2 Table 6-2: Categories of community/group response (SANS 10103, 2008) .......................................... 3 Table 6-3: Noise measurement locations ............................................................................................... 4 iv Environmental Noise Impact Assessment for the proposed Ventersburg Gold Mine GOL1675 Table 6-4: Measurement location N1 ...................................................................................................... 6 Table 6-5: Measurement location N2 ...................................................................................................... 6 Table 6-6: Measurement location N3 ...................................................................................................... 7 Table 6-7: Measurement location N4 ...................................................................................................... 7 Table 6-8: Sound power levels from main noise causing sources.......................................................... 8 Table 7-1: Results of the baseline noise measurements ...................................................................... 10 Table 7-2: Noise sources during baseline measurements .................................................................... 15 Table 8-1: Surrounding relevant receivers ............................................................................................ 16 Table 9-1: Impact assessment parameter ratings................................................................................. 22 Table 9-2: Probability X Consequence Matrix....................................................................................... 24 Table 9-3: Significance threshold limits ................................................................................................ 24 Table 12-1: Information pertaining to the recommended mitigation measures for the construction phase ..................................................................................................................................................... 28 Table 13-1: Monitoring plan .................................................................................................................. 29 LIST OF APPENDICES Appendix A: Curriculum Vitae and Declaration of Independence LIST OF ACCOUSTIC TERMS A-weighted A measure of sound pressure level designed to reflect the acuity sound level of the human ear. Decibel (dB) A unit in which sound pressure is measured. dBA Unit of sound level. The weighted sound pressure level by the use of the A metering characteristic, which allows the sound pressure level to be measured at the approximate sensitivity as the human ear LAeq,T Is the value of the A-weighted sound pressure level of a continuous, steady sound that, within a specified time interval T m, v Environmental Noise Impact Assessment for the proposed Ventersburg Gold Mine GOL1675 has the same mean-square sound pressure as a sound under consideration whose level varies with time. vi Environmental Noise Impact Assessment for the proposed Ventersburg Gold Mine GOL1675 1 INTRODUCTION Gold One Africa (Pty) Ltd. (Gold One) was granted a prospecting right to prospect for gold in an area located in the Free State Gold Fields area, close to Ventersburg, a farming town approximately 48 km from Welkom. The prospecting