Swimming pool installations which have been determined to be abandoned shall be filled with sand or other granular materials as may be approved by the administrative authority. (Ord. 3396 § 8, 2021; Ord. 3196 § 6, 2016; Ord. 3006 § 4 (Exh. D), 2013; Ord. 2683 § 7, 2007; Ord. 1504 § 1, 1986; Ord. 640 § 3, 1972)