| Proposed Mitigation and Monitoring | WNP Wharekirauponga Underground Mine - Assessment of Effects of Discharges to Air | 4397169-66885702-23 | | 51 established on topsoil stores and the noise bunds and the construction of the surface infrastructure is complete. Table 8-2 Recommended trigger values and actions for wind speeds and TSP concentrations at proposed monitoring site Item Trigger Action TSP Alert TSP concentration (1-hour average) exceeds 170 µg/m3. Dust sources and dust control measures within 200 m of sensitive receptors on Willows Road will be reviewed and additional dust control methods shall be implemented if necessary, as detailed in the site AQMP. TSP Alarm TSP concentration (1-hour average) exceeds 200 µg/m3 Or TSP concentration (24-hour average) exceeds 60 µg/m3 Contributing dust generating activities will cease within 200 m of sensitive receptors on Willows Road except for dust control activities as detailed in the AQMP. Wind Speed Alert Hourly average wind speeds exceed 5 m/s and winds are blowing towards sensitive receptors. Dust sources and dust control measures within 200 m of sensitive receptors on Willows Road will be reviewed and additional dust control methods shall be implemented if necessary, as detailed in the site AQMP. Wind Speed Alarm (note does not apply during rain events) Gust wind speeds (two-minute average or less) exceed 10 m/s during two consecutive ten-minute periods and winds are blowing towards sensitive receptors. Works may recommence when wind gusts (two-minute average or less) are less than 7.5 m/s during the previous two consecutive ten-minute periods. Contributing dust-generating activities will cease within 200 m of sensitive receptors on Willows Road except for dust control activities as detailed in the site AQMP.
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