B-2 – Area 2 - Assessment of Environmental Effects 77 Actual or Potential Effect Recommended Mitigation / Management Recommended Monitoring / Future Action Additional Measures Proposed by OGNZL Vibration between the hours of 0700 and 2000, Monday to Saturday (excluding public holidays) - 95% of blast events no greater than 5mm/s; Vibration at all other times - 95% of blast events no greater than 1mm/s; and The duration of the underground development blast events shall be limited to no more than 12 seconds. Preparation and implementation of a Vibration Management Plan which sets out how the limits above will be achieved and how impacts of blasting on the community will be minimised to the extent practicable. Making monitoring results available to the public on the OGNZL website. Establishment of a complaints register and management actions. Vibration monitoring for the Willows Access Tunnel would only be required at one site at any time, although that site may need to move as development progresses from the portal towards the junction with the dual tunnels. Noise Excessive noise creating nuisance impacts. Compliance with NZS6803:1999 Acoustics – Construction Noise (NZS6803) for construction noise. Compliance with the following operational noise limits at neighbouring properties not owned by OGNZL: 0700 - 2200, Monday to Saturday: 50 dB LAeq All other times: 40 dB LAeq 2200 - 0700 (the following day): 70 dB LAFmax Preparation and implementation of a Noise Management Plan. Noise monitoring at weekly intervals during construction, and quarterly during operation. Monitoring requirements are to be detailed in the Noise Management Plan. None.
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