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Exempt <br />Allowable <br />Allowable <br />Prohibited <br />with <br />Mitigation <br />Airport facilities: <br />• Airport facilities that impact equal to or less than 150 <br />X <br />linear feet or one -third of an acre of riparian buffer <br />• Airport facilities that impact <br />rp p greater than 150 linear feet <br />X <br />or one -third of an acre of riparian buffer <br />Archaeological activities <br />X <br />Bridges <br />X <br />Dam maintenance activities <br />X <br />Drainage ditches, roadside ditches and stormwater outfalls <br />through riparian buffers: <br />• Existing drainage ditches, roadside ditches, and <br />X <br />stormwater outfalls provided that they are managed to <br />minimize the sediment, nutrients and other pollution that <br />convey to waterbodies <br />• New drainage ditches, roadside ditches and stormwater <br />X <br />outfalls provided that a stormwater management facility is <br />installed to control nitrogen and attenuate flow before the <br />conveyance discharges through the riparian buffer <br />X <br />• New drainage ditches, roadside ditches and stormwater <br />outfalls that do not provide control for nitrogen before <br />discharging through the riparian buffer <br />X <br />• Excavation of the streambed in order to bring it to the <br />same elevation as the invert of a ditch <br />Drainage of a pond in a natural drainage way provided that <br />X <br />a new riparian buffer that meets the requirements of <br />Section 3.B and 3.0 is established adjacent to the new <br />channel <br />