Volume Two 3. Rural Environment Zone (c) Excavation of a vertical hole, not exceeding 500mm in diameter, that is a post hole for a farm fence or horticulture structure and more than 5m from the visible outer edge of a tower support structure foundation. 3.3.15.2. The excavation must be no deeper than 300mm within 6m of the outer visible edge of a Transmission Tower Support Structure. 3.3.15.3. The excavation must be no deeper than 3m between 6m and 12m of the outer visible edge of a Transmission Tower Support Structure. 3.3.15.4. The excavation must not compromise the stability of a National Grid Support Structure. 3.3.15.5. The filling must not result in a reduction in the ground to conductor clearance distances as required in Table 4 of the New Zealand Electrical Code of Practice (NZECP34:2001). 3.3.16. Filling of land with clean fill. 3.3.16.1. The filling must not use commercial clean fill. 3.3.16.2. Filling in excess of 1000m 3must not occur within any 24 month period. 3.3.16.3. Fill must not be placed over woody vegetation on land with a slope greater than 10°. 3.3.16.4. Fill must not be within a Level 2 or 3 Flood Hazard Area, or in the Level 4 Flood Hazard Area in the vicinity of Conders Overflow. 3.3.16.5. A filled area must designed, constructed and maintained to ensure it is stable and remains effective after completion of filling. 3.3.16.6. 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 fill areas must not be less than 300mm. 3.3.16.7. 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. 3.3.16.8. 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. 3.3.16.9. 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. 3.3.16.10. There must be no filling in excess of 500m 3 per Computer Register located within the following Outstanding Natural Features and Landscapes within any 12 month period: (a) Chalk Range; (b) Inland Kaikoura Range; (c) Molesworth Station and Upper Clarence; (d) Limestone Coastline. 3 – 19