20. Open Space 4 Zone Volume Two 20.2. Standards that apply to all permitted activities 20.2.1. Noise. 20.2.1.1. An activity must not cause noise that exceeds the following limits at the zone boundary or within the zone: 7.00 am to 10.00 pm 65 dBA L Aeq 10.00 pm to 7.00 am 65 dBA L Aeq 75dBL AFmax 20.2.1.2. Noise must be measured in accordance with NZS 6801:2008 – Measurement of Environmental Sound, and assessed in accordance with NZS 6802:2008 – Environmental Noise. 20.2.1.3. Construction noise must not exceed the recommended limits in, and must be measured and assessed in accordance with, NZS6803:1999 Acoustics – Construction Noise. 20.2.2. Odour. 20.2.2.1. The odour must not be objectionable or offensive, as detected at or beyond the legal boundary of the area of land on which the permitted activity is occurring. 20.2.3. Smoke. 20.2.3.1. The smoke must not be objectionable or offensive, as detected at or beyond the legal boundary of the area of land on which the permitted activity is occurring. 20.2.4. Dust. 20.2.4.1. The best practicable method must be adopted to avoid dust beyond the legal boundary of the area of land on which the activity is occurring. 20.2.5. Dust from any process vent or stack. 20.2.5.1. The dust must not contain hazardous substances. 20.2.5.2. The particulate discharge rate from any air pollution control equipment and dust collection system must not exceed 250mg/m at any time, corrected to 0°C, 1 3 atmosphere pressure, dry gas basis. 20.2.5.3. Dust particles must not exceed 0.05mm size in any direction. 20.3. Standards that apply to specific permitted activities 20.3.1. Avalanche control works. 20.3.1.1. Control works must only be undertaken to the extent that is required to provide for a safe environment for skifield activity. 20.3.1.2. Any control works that have an adverse effect on a river, lake or Significant Wetland must be reported to the Council within 24 hours of the works being conducted. 20.3.2. Use of an existing building for staff accommodation. 20.3.2.1. The on-site accommodation must be for staff of the skifield and be necessary for the operation of the skifield. 20 – 2