14. Port Landing Area Zone Volume Two measures remain effective after completion of the filling. The diameter of a culvert used to drain a fill area must not be less than 300mm. 14.3.9.5. When filling has been completed, the filled area must be covered with at least 200mm of soil, and sown down with a suitable vegetative cover or other means to achieve a rapid vegetative cover must be used. 14.3.9.6. Filling must not be in, or within 8m of, a river (except an ephemeral river when not flowing) or the coastal marine area. 14.3.10. Non-indigenous vegetation clearance. 14.3.10.1. 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) or the coastal marine area. 14.3.10.2. All trees must be felled away from a river (except an ephemeral river, or intermittently flowing river when not flowing) or the coastal marine area. 14.3.10.3. No tree or log must be dragged through the bed of a river (except an ephemeral river or intermittently flowing river when not flowing) or the coastal marine area. 14.3.10.4. 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) or the coastal marine area. 14.3.10.5. On completion of a vegetation clearance, a suitable vegetative cover that will mitigate soil loss, must 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. 14.3.10.6. The depth of topsoil removed must not exceed more than 20mm over more than 15% of any vegetation clearance site. 14.3.10.7. 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) 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) 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. 14.3.10.8. Vegetation clearance must not cause any conspicuous change in the colour or visual clarity of a flowing river after reasonable mixing, 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%. 14.3.11. Marine oil spill clean-up activity and the associated release of oil dispersants. 14.3.11.1. Oil spill dispersants must be used by a person described in Section 467 of the Maritime Transport Act 1994. 14 – 6