18. Open Space 2 Zone Volume Two 18.3.3. Indigenous vegetation clearance. 18.3.3.1. Indigenous vegetation clearance must comply with Standards 18.3.4.1 to 18.3.4.4 (inclusive). 18.3.3.2. The clearance of indigenous vegetation in the following circumstances is exempt from Standards 18.3.3.3 and 18.3.3.4: (a) indigenous vegetation dominated by manuka, kanuka, tauhinu, bracken fern and silver tussock, and which has grown naturally from previously cleared land (i.e. regrowth) and where the regrowth is less than 20 years in age; (b) indigenous vegetation dominated by matagouri, and which has grown naturally from previously cleared land (i.e. regrowth) and where the regrowth is less than 50 years in age; (c) where the clearance is associated with the maintenance of an existing road or track. 18.3.3.3. Clearance of indigenous vegetation must not occur on land identified on a Threatened Environments – Indigenous Vegetation Site. 18.3.3.4. Clearance of indigenous vegetation must not exceed 2000m per Computer 2 Register in any 5 year period. 18.3.4. Non-indigenous vegetation clearance. 18.3.4.1. Vegetation must not be removed by fire or mechanical means within 8m of a river (except an ephemeral river, or intermittently flowing river when not flowing), lake or the coastal marine area. 18.3.4.2. 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), lake, Significant Wetland or the coastal marine area. 18.3.4.3. Within, or within 8 metres of, a Significant Wetland, Pest Plants identified in Appendix 25 and willow, blackberry, broom, gorse and old man’s beard are the only vegetation that may be removed. Any vegetation removed under this Standard must only be cleared by non-mechanical means. 18.3.4.4. Woody material greater than 100mm in diameter or soil debris must: (a) not be left within 8m of, or deposited in, a river (except an ephemeral river or intermittently flowing river, when not flowing) lake, Significant Wetland or the coastal marine area; (b) not be left in a position where it can enter, or be carried into, a river (except an ephemeral river) lake, Significant Wetland or the coastal marine area; (c) be stored on stable ground; (d) be managed to avoid accumulation to levels that could cause erosion or instability of the land. 18.3.5. Excavation. 18.3.5.1. Excavation must not be in, or within: (a) 8m of a river (except an ephemeral river when not flowing) or the coastal marine area; 18 – 4