No body shall be buried in said District in any vault unless the coffin be separately entombed in properly cemented stone or brick work, so as to render such vault airtight; such vault, after having been sealed, shall not be opened within 10 years; no body shall be temporarily deposited in any vault for a longer period than 1 month, unless such body is in an hermetically sealed metallic case, nor in any instance for a longer period than 1 year.
D.C. Code § 43-122