| Executive Summary | WNP – Air Discharge Assessment - Wharekirauponga Underground Mine -t| 4397169-66885702-23 | |1 Contents Executive Summary ................................................................................................ 5 1 Introduction........................................................................................................ 7 1.1 Overview.......................................................................................................................................... 7 1.2 Project Summary ............................................................................................................................. 7 1.3 Air Discharge Consent Requirements ............................................................................................. 9 1.4 Purpose of Report............................................................................................................................ 9 1.5 Limitations...................................................................................................................................... 10 2 Project Description.......................................................................................... 11 2.1 Overview........................................................................................................................................ 11 2.2 Key Features of Project in Regard to Air Quality at Willows Road Site ........................................ 13 2.3 Wastewater Treatment and Disposal ............................................................................................ 17 2.4 Water Supply ................................................................................................................................. 17 2.5 Tunnelling Operations.................................................................................................................... 17 2.6 WUG Access Tunnel ..................................................................................................................... 18 2.7 Mining ............................................................................................................................................ 18 2.8 Working Hours ............................................................................................................................... 18 2.9 Work Schedule .............................................................................................................................. 18 2.10 Closure and Rehabilitation............................................................................................................. 18 3 Environmental Setting..................................................................................... 20 3.1 Overview........................................................................................................................................ 20 3.2 Sensitive Receptors....................................................................................................................... 21 3.3 Air Shed Status .............................................................................................................................. 22 3.4 Background Air Quality .................................................................................................................. 22 3.5 Meteorological Data....................................................................................................................... 23 4 Air Quality Standards and Guidelines ........................................................... 27 4.1 National Environmental Standards and Guidelines for Ambient Air Quality.................................. 27 4.2 Dust Guidelines ............................................................................................................................. 28 5 Air Discharges and Associated Mitigation Methods.................................... 29 5.1 Overview........................................................................................................................................ 29 5.2 Dust from Surface Sources............................................................................................................ 29 5.3 Products of Combustion from Surface Vehicles ............................................................................ 32 5.4 Air Discharges from Tunnelling and Mining................................................................................... 32 5.5 Air Discharges from Wastewater Treatment and Effluent Disposal Area...................................... 33 6 Existing Effects of Waihi Operations on the Environment .......................... 34 6.1 Potential for Dust to Cause Adverse Effects ................................................................................. 34 6.2 OGNZL Air Quality Monitoring Programme ................................................................................... 35 6.3 Results of Monitoring around Waihi Mine...................................................................................... 35 6.4 Complaints ..................................................................................................................................... 36 6.5 Summary of Current and Past Effects of Mining in Waihi ............................................................. 37
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