| Executive Summary | WNP – Air Discharge Assessment - Wharekirauponga Underground Mine -t| 4397169-66885702-23 | |6 The assessment of potential effects of the development and operation of the mine and tunnels described in this report has identified that there is a moderate to high risk of infrequent, short duration discharges of dust during dry windy conditions affecting the privately owned dwelling at 111 Willows Road. There is also a moderate risk from infrequent, short duration nuisance dust at the privately owned dwelling at 122 Willows Road. No other privately owned dwellings are expected to be adversely affected by dust during site construction and operation. The risks are greatest in the initial stage of the project when the surface infrastructure is being constructed and land areas are exposed and topsoil stockpiles unvegetated. It is recommended that a new weather station be installed close to the OGNZL-owned dwelling on Willows Road to monitor wind speed and direction, as well as total suspended particulate (TSP), and that some additional mitigation measures are implemented on site when weather conditions are conducive to the generation of dust. Based on modelling undertaken separately by consultants Tonkin and Taylor as well as ecology assessments, the risks of discharges to people and native flora or fauna from discharges from the proposed tunnel raises is considered to be very low. The concentrations of contaminants including particulate matter (PM10), respirable crystalline silica, nitrogen oxides (NO2 and NO) and carbon monoxide are expected to remain within the National Environmental Standards for Air Quality (NESAQ), guideline values and current consent limits beyond the boundary of the project. A draft Air Quality Management Plan has been prepared that describes the dust monitoring and mitigation methods to be used by OGNZL at the site. The assessment of effects described in this report concludes that, providing OGNZL continues to use the methods currently used at the nearby Waihi Mine to minimise discharges to air, and adopts the additional monitoring and mitigation measures recommended in this report, the adverse effects of discharges to air from the project will be adequately avoided and mitigated. Consequently, the likelihood that these discharges will result in noxious, dangerous, offensive or objectionable effects beyond the site boundary is considered to be low.
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