Volume Two 18. Open Space 2 Zone (b) 8m of the landward toe of a stopbank and the depth of any excavation beyond that may not exceed 15% of the distance between the landward toe of the stopbank and the excavation. 18.3.5.2. There must be no excavation in excess of 10m within a Groundwater 3 Protection Area. 18.3.5.3. Batters must designed and constructed to ensure they are stable and remain effective after completion of the excavation. 18.3.5.4. Water control measures and sediment control measures must be designed, constructed and maintained in an area disturbed by excavation, such that the area is stable and the measures remain effective after completion of the excavation. The diameter of a culvert used to drain any excavation must not be less than 300mm. 18.3.5.5. 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. 18.3.6. Filling of land with clean fill. 18.3.6.1. The filling must not use commercial clean fill. 18.3.6.2. Filling must not be in, or within: (a) 8m of a river (except an ephemeral river when not flowing); (b) 8m of the landward toe of a stopbank; 18.3.6.3. A filled area must be designed, constructed and maintained to ensure it is stable and remains effective after completion of filling. 18.3.6.4. Water control measures and sediment control measures must be designed, constructed and maintained in a fill area, such that the area is stable and the measures remain effective after completion of the filling. The diameter of a culvert used to drain any filled area must not be less than 300mm. 18.3.6.5. 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. 18.3.7. Discharge of contaminants to air arising from burning in the open. 18.3.7.1. Only material generated on the same property or a property under the same ownership can be burned. 18.3.7.2. The property where the burning is to occur must be located outside of the Blenheim Airshed. 18.3.7.3. The material being burned must not exceed 2m 3 . 18.3.8. Application of an agrichemical into or onto land. 18.3.8.1. The agrichemical must be approved for use under the Hazardous Substances and New Organisms Act 1996. 18.3.8.2. Triazine herbicide must not be applied to a Soil Sensitive Area identified as free-draining soils. 18.3.8.3. The application must not result in the agrichemical being deposited in or on a river, lake, Significant Wetland, drainage channel or Drainage Channel Network that contains water. 18 – 5