The Mayor shall review each permit application for any excavation, grading, fill, or construction to determine whether the proposed site and improvements will be reasonably safe from mudslides. If a proposed site and improvements are in a location that may have mudslide hazards, a further review shall be made by persons qualified in geology and soils engineering; and the proposed new construction, substantial improvement, or grading must:
(1) Be adequately protected against mudslide damage; and
(2) Not aggravate the existing hazard.