2. General Rules Volume Two 2.8. Standards that apply to all permitted activities 2.8.1. General. 2.8.1.1. No refuelling or fuel storage or the storage or placement of any hazardous substance, including but not limited to oil, hydraulic fluid or other fluid lubricants, must take place within 20m of water. 2.8.1.2. The activity must not cause flooding or erosion of private land. 2.8.1.3. The activity must be planned and conducted in a manner that does not compromise public safety. 2.8.1.4. Any discharge of sediment into water must not, after reasonable mixing, cause a change in colour of more than 5 Munsell units or a decrease in clarity of more than 20% for more than 8 hours in any 24 hour period and more than 40 hours in total in any calendar month. 2.8.1.5. During the period of 1 September to 31 December in any year no activity must occur within 50m of a nesting bird in a lakebed or riverbed. 2.8.1.6. An activity within the wetted area of a riverbed must not be carried out in a tidal reach between 1 February and 30 April, and 1 August and 30 November in any year. 2.8.2. Removal and control of terrestrial vegetation. 2.8.2.1. Removal and control must be done by mechanical or other physical means. 2.8.2.2. All cut or felled vegetation that exceeds 100mm in diameter at any point must be removed from the bed of the lake or river (except an ephemeral river or intermittently flowing river, when not flowing). 2.8.2.3. Machinery must not be operated in flowing water. 2.8.2.4. Removal of trees overhanging or partially in water must be by machinery operated on the lake or river bank or mounted on boats or barges. 2.8.3. Dust. 2.8.3.1. The best practicable method must be adopted to avoid dust beyond the legal boundary of the area of land on which the activity is occurring. 2.9. Standards that apply to specific permitted activities 2.9.1. Alteration, repair or maintenance of an existing structure in, on or over the bed of a lake or river. 2.9.1.1. The structure must have been lawfully established. 2.9.1.2. The activity must not increase the plan or cross-sectional area of the structure by any more than 5% of the original structure; except that this Standard does not apply to the alteration or maintenance of the superstructure of a bridge or culvert that does not affect the hydraulic efficiency of the river under the structure. 2.9.1.3. There must be no significant change to the external appearance of the structure. Painting a structure is not a significant change for the purposes of this Standard. 2 – 12