13. Port Zone Volume Two 13.3.19.6. Wheeled or tracked machinery must not be operated in, or within 8m of, any river (except an ephemeral river or intermittently flowing river, when not flowing), Significant Wetland or the coastal marine area. 13.3.19.7. On completion of a vegetation clearance operation, 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. 13.3.19.8. The depth of topsoil removed must not exceed more than 20mm over more than 15% of any vegetation clearance site. 13.3.19.9. Woody material greater than 100mm in diameter or 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), 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), 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. 13.3.19.10. Vegetation clearance must not cause any conspicuous change in the colour or visual clarity of a flowing river after reasonable mixing, or 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; (b) the natural clarity must not be conspicuously changed due to sediment or sediment laden discharge originating from the vegetation clearance site; (c) the change in reflectance must be <50%. 13.3.20. Indigenous vegetation clearance. 13.3.20.1. Indigenous vegetation clearance must comply with Standards 13.3.19.1 to 13.3.19.10 (inclusive). 13.3.20.2. The clearance of indigenous vegetation in the following circumstances is exempt from Standards 13.3.20.3 to 13.3.20.6: (d) indigenous vegetation under or within 50m of commercial forest, woodlot forest or shelter belt; (e) indigenous vegetation dominated by manuka, kanuka, tauhinu, bracken fern and silver tussock, and which has grown naturally from previously cleared land (i.e. regrowth) and where the regrowth is less than 20 years in age; (f) indigenous vegetation dominated by matagouri, and which has grown naturally from previously cleared land (i.e. regrowth) and where the regrowth is less than 50 years in age; (g) where the clearance is associated with the maintenance of an existing road, forestry road, harvesting track or farm track. 13.3.20.3. Clearance of indigenous vegetation must not occur on land above mean high water springs that is within 20m of an Ecologically Significant Marine Site. 13 – 12