Volume Two 19. Open Space 3 Zone 19.3.5.11. There must be no excavation in excess of 10m 3 within a Groundwater Protection Area. 19.3.5.12. Wheeled or tracked machinery must not be operated in, or within 8m of, a river (except any ephemeral river or intermittently flowing river, when not flowing), lake, Significant Wetland or the coastal marine area. 19.3.5.13. Batters must be designed and constructed to ensure they are stable and remain effective after completion of the excavation. 19.3.5.14. 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. 19.3.5.15. Excavation must not cause any conspicuous change in the colour or visual clarity of any flowing river after reasonable mixing, or the water in a Significant Wetland, lake or 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 excavation site; (c) the change in reflectance must be <50%. 19.3.6. Filling of land with clean fill. 19.3.6.1. The filling must not use commercial clean fill. 19.3.6.2. Filling in excess of 1000m 3must not occur within any 24 month period. 19.3.6.3. Fill must not be placed over woody vegetation on land with a slope greater than 10°. 19.3.6.4. Filling must not be in, or within: (a) 8m of a river (except an ephemeral river when not flowing), lake or the coastal marine area; (b) 8m of, a Significant Wetland or 30m of a river within a Water Resource Unit with a Natural State classification; (c) 8m of the landward toe of a stopbank. 19.3.6.5. The filling must not occur in a Soil Sensitive Area identified as loess soils. 19.3.6.6. Filling must not be within such proximity to any abstraction point for a drinking water supply registered under section 69J of the Health Act 1956 as to cause contamination of that water supply. 19.3.6.7. A filled area must be designed, constructed and maintained to ensure it is stable and remains effective after completion of filling. 19.3.6.8. 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 any culvert used to drain any fill areas must be less than 300mm. 19.3.6.9. When the 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. 19.3.6.10. Filling must not be within a Level 2 or 3 Flood Hazard Area. 19 – 7