4. Coastal Environment Zone Volume Two 4.3.16.2. The bore casing must contain only one screen, which must not exceed 10m in length. 4.3.16.3. The bore must be capped at all times. 4.3.16.4. The bore must be constructed by a Recognised Professional. 4.3.16.5. A copy of the bore log, including a grid reference identifying the bore location, must be supplied to the Council in a suitable electronic format within 20 working days of construction or alteration of the bore. Additional Standards for bores to be used for domestic purposes: 4.3.16.6. The bore must not be located within 10m of an existing bore used for domestic purposes on an adjacent property in different ownership. Additional Standards for bores to be used for irrigation purposes: 4.3.16.7. The bore must not be located within 50m of an existing bore on an adjacent property in different ownership. 4.3.17. Geotechnical bore drilling for the purposes of investigation of sub-surface conditions. 4.3.17.1. The bore must be drilled by a Recognised Professional. 4.3.17.2. A copy of the bore log, including a grid reference identifying the bore location, must be supplied to the Council in a suitable electronic format within 20 working days of the drilling of the bore. 4.3.17.3. On completion of the geotechnical investigation, the bore must be sealed or capped to prevent any potential contamination of groundwater. 4.3.18. Construction of an off-river dam. The construction of a dam does not authorise the taking, use, damming or diversion of water, rules for these activities are in the General Rules. 4.3.18.1. The dam must not be within 8m of a perennially flowing or intermittently flowing river. 4.3.18.2. The dam must not intersect the groundwater. 4.3.18.3. The dam must not be located in, or within 8m of, a Significant Wetland. 4.3.18.4. The dam must not be built within 500m upstream of a dwelling, formed public road or designated rail infrastructure. 4.3.18.5. The construction must comply with the Permitted Activity standards for Excavation, Filling, Indigenous Vegetation Clearance and Non-Indigenous Vegetation Clearance in the Coastal Environment Zone. 4.3.18.6. The dam walls must comply with the setbacks for buildings in Standards 4.2.1.3 and 4.2.1.10. 4.3.19. Land disturbance to create and maintain a fire break. 4.3.19.1. Water control measures and sediment control measures must be designed, constructed and maintained in all areas disturbed in the creation of a fire break, such that the areas are stable and the measures remain effective after completion of the land disturbance. 4.3.20. Livestock entering onto, or passing across, the bed of a river. 4.3.20.1. The entering onto or passing across the bed of a river of livestock must not involve intensively farmed livestock if there is water flowing in the river. 4 – 16