D.C. Mun. Regs. tit. 11-D, § 401
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401.1 The provisions of this section shall apply to R-1A/FH zoned lots in Squares 2042, 2043, 2046, 2049, 2231, 2232, 2238, 2239, 2244 through 2248, 2250, 2258, 2272, and 2282.
401.2 The tree protection regulations of Subtitle C, Chapter 4 shall apply.
401.3 To the extent that any person seeks permission for building or terrain alteration on a lot with a slope steeper than twenty-five percent (25%) or with "highly erodible land" as defined at 7 C.F.R. § 12.2 (2005), a professional certification that the plans for alteration and/or construction will follow best geo-technical, structural engineering, and arboreal practices shall be supplied with the building permit application.
SOURCE: Final Rulemaking published at 63 DCR 2447, 2834 (March 4, 2016 – Part 2); as amended by Final Rulemaking published at 70 DCR 011297 (August 25, 2023).