It is intended that there be a minimum of grading involved in the development of a planned residential development project. Where grading is found necessary to improve the overall development of the site, all cut and fill slopes shall not exceed three to one (3:1), i.e., three (3) horizontal to one vertical. In the HD (hillside development) district, a two to one (2:1) slope may be allowed by the planning commission when found to be in conformance with sections 18.144.010 of this chapter and 18.192.070 of this title. All other provisions of the Redlands grading code shall apply. (Ord. 2178 § 1, 1991: Ord. 1000 § 52.54(S), 1955)