13. Port Zone Volume Two 13.3.15. Clearance of sand, shell, shingle or other natural material from a river mouth for flood mitigation. 13.3.15.1. The clearance must be carried out by, or on behalf of, the Marlborough District Council. 13.3.15.2. Disturbance must be limited to the amount necessary to clear the river mouth for flood mitigation purposes. 13.3.15.3. All equipment must be removed from the site on completion of the clearance. 13.3.15.4. The best practicable option must be adopted to avoid significant sedimentation. 13.3.15.5. The clearance must not cause a safety hazard to other users of the river mouth. 13.3.15.6. There must be no contaminants released from equipment being used for the activity. 13.3.15.7. Refuelling of equipment must not take place on any area of foreshore or seabed. 13.3.15.8. Fish passage must not be impeded. 13.3.16. Clearance of sand, shell, shingle or other natural material from a stormwater outfall pipeline, drain or culvert. 13.3.16.1. Disturbance must be undertaken by non-mechanical means, or be undertaken by, or on behalf of, the Marlborough District Council. 13.3.16.2. Disturbance must be limited to the amount necessary to clear the outfall, pipeline or culvert for flood mitigation purposes. 13.3.16.3. All equipment must be removed from the site on completion of the clearance. 13.3.16.4. The best practicable option must be adopted to avoid significant sedimentation. 13.3.16.5. The clearance must not cause a safety hazard to other users of the area. 13.3.16.6. There must be no contaminants released from equipment being used for the clearance. 13.3.16.7. Fish passage must not be impeded. 13.3.16.8. Refuelling of equipment must not take place on any area of foreshore or seabed. 13.3.17. Excavation. 13.3.17.1. No excavation in excess of 1000m must occur on any land with a slope 3 greater than 20° within any 24 month period. 13.3.17.2. No excavation may occur on any land with a slope greater than 35°. 13.3.17.3. Excavation must not be in, or within 8m of, a river (except an ephemeral river when not flowing), a Significant Wetland or the coastal marine area. 13.3.17.4. Excavation in excess of 500m per Computer Register must not occur within 3 the Marlborough Sounds Outstanding Natural Feature and Landscape within any 12 month period. 13 – 10