D.C. Code § 6-504
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:
May 26, 1976, D.C. Law 1-64, § 5, 22 DCR 7146
1973 Ed., § 5-1104.
1981 Ed., § 5-304.