4. Coastal Environment Zone Volume Two (b) 10,000m in any 5 year period where the average canopy height is 2 below 3m, except for the following species where clearance in any 5 year period must not exceed: (i) 500m of indigenous sub-alpine vegetation; 2 (ii) 100m of tall tussock of the genus Chinochloa. 2 4.3.11. Non-indigenous vegetation clearance. 4.3.11.1. Where clearance is by mechanical means, blading or root-raking by a bulldozer must not be used on slopes greater than 20°. 4.3.11.2. Vegetation must not be removed by fire or mechanical means within 8m of a river (except an ephemeral river, or intermittently flowing river when not flowing), lake or the coastal marine area. 4.3.11.3. Vegetation clearance must not be in, or within 8m of a Significant Wetland. 4.3.11.4. Vegetation clearance must not be within such proximity to any abstraction point for a community drinking water supply registered under section 69J of the Health Act 1956 as to cause contamination of that water supply. 4.3.11.5. All trees must be felled away from a river (except an ephemeral river, or intermittently flowing river when not flowing), lake, Significant Wetland or the coastal marine area. 4.3.11.6. No tree or log must be dragged through the bed of a river (except an ephemeral river or intermittently flowing river, when not flowing), lake or Significant Wetland or through the coastal marine area. 4.3.11.7. Wheeled or tracked machinery must not be operated in or within 8m of a river (except an ephemeral river or intermittently flowing river, when not flowing), lake, Significant Wetland or the coastal marine area. 4.3.11.8. On completion of a vegetation clearance, a suitable vegetative cover that will mitigate soil loss, is to be restored on the site so that, within 24 months the amount of bare ground is to be no more than 20% greater than prior to the vegetation clearance taking place. 4.3.11.9. The depth of topsoil removed must not exceed more than 20mm over more than 15% of any vegetation clearance site. 4.3.11.10. Woody material greater than 100mm in diameter and soil debris must: (a) not be left within 8m of, or deposited in, a river (except an ephemeral river or intermittently flowing river when not flowing), lake, Significant Wetland or the coastal marine area; (b) not be left in a position where it can enter, or be carried into, a river (except an ephemeral river), lake, Significant Wetland or the coastal marine area; (c) be stored on stable ground; (d) be managed to avoid accumulation to levels that could cause erosion or instability of the land. 4.3.11.11. Vegetation clearance must not cause any conspicuous change in the colour or visual clarity of a flowing river after reasonable mixing, or the water in a Significant Wetland, lake or the coastal marine area measured as follows: (a) hue must not be changed by more than 10 points on the Munsell scale; 4 – 12