D.C. Mun. Regs. tit. 1, r. 1-500
On the date these rules become effective, they shall apply to all appeals and cross-appeals thereafter filed and to all appeals and cross-appeals then pending but not heard.
No case which is pending but not heard after the effective date of these rules shall be disposed of on the sole ground that either party failed to comply with this chapter unless, after notice of the deficiency and expiration of a fixed, reasonable time to comply, the deficiency has not been corrected.
Except for the time limits for filing a notice of appeal and a notice of cross-appeal (§§ 503.2 and 503.4), the Board for good cause shown may, in the interest of justice or to prevent undue hardship, waive any of the provisions of these rules in any proceeding.
In the event of a conflict between this chapter and a provision of a statute, regulation adopted by the Council of the District of Columbia, or order of the Mayor, the provision of the statute, regulation, or order shall govern. In the event of a conflict between this chapter and a regulation adopted by a District department, agency, or office, this chapter shall govern. In the event of a conflict within this chapter between a general and a special rule, the special rule shall govern.
D.C. Mun. Regs. tit. 1, r. 1-500