(a)   The noise exposure zone reflects the 65 DNL as regulated by the Federal Aviation Administration as shown within the June 28, 2007, adopted airport master plan, on file with the Sioux Falls Regional Airport Authority.
   (b)   An avigation easement shall be placed on property within the noise exposure zone when a building permit for substantial improvements to a habitable residential structure is being requested.
(1992 Code, App. B, § 15.43.108)  (Ord. 42-83, passed 6-27-1983; Ord. 71-09, passed 8-3-2009; Ord. 9-13, passed 3-19-2013)