All caskets containing the remains of decedents to be interred in either of the cemeteries described in section 7-7-1 of this chapter shall be, at the time of interment, enclosed in a vault constructed of concrete, plastic or steel, the construction and quality of same to be subject to the approval of the city. (1980 Code § 6-21.5; amd. Ord. 282, 11-8-2010)