These Regulations apply to all hillside areas. A hillside area as referred to herein is defined as one with an average slope of more than fifteen percent (15%). These areas may be found in the three-mile area outside the corporation limits. The subdivider shall submit sufficient detailed information as to geologic conditions, soil types and underground water level in order that a determination can be made by the City or County Engineer, as the case may be, as to the safety of development of the particular location.
(1984 Code Sec. 151.100)