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010 <br /> Exempt Allowable Allowable Prohibited <br /> with <br /> Mitigation <br /> Airport facilities: <br /> • Airport facilities that impact equal to or less than 150 X <br /> linear feet or one-third of an acre of riparian buffer <br /> • Airport facilities that impact greater than 150 linear feet X. <br /> or one-third of an acre of riparian buffer <br /> Archaeological activities X <br /> Bridges X <br /> Dam maintenance activities X <br /> Drainage ditches,roadside ditches and stormwater outfalls <br /> through riparian buffers: <br /> • Existing drainage ditches,roadside ditches,and X <br /> stormwater outfalls provided that they are managed to <br /> minimize the sediment,nutrients and other pollution that <br /> convey to waterbodies <br /> X <br /> • New drainage ditches,roadside ditches and stormwater <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 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 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 X <br /> a new riparian buffer that meets the requirements of <br /> Section 3.13 and 3.0 is established adjacent to the new <br /> channel <br /> 4 <br />