A steep slope or hillside shall contain one or more of the following criteria:
(a) Areas that exhibit evidence of past or present unstable soil.
(b) Areas having slopes with a natural gradient equal to or greater than thirty percent and where the vertical (elevation) change is twenty feet or greater, as graphically depicted in "Exhibit A," following the text of this chapter, which is hereby adopted and incorporated herein by reference.
(Ord. 1999-150. Passed 12-14-99.)