(a) This section applies to: (1) complete replacement of an existing underground facility; (2) underground storm drain systems and applicable devices; and (3) an existing previously detectable underground facility or locatable underground facility. (b) Except as otherwise provided in § 12–129 of this subtitle, on or after October 1, 2021, all newly installed underground facilities shall be detectable or locatable. (c) Not later than October 1, 2021, any previously detectable underground facility or underground facility locatable during planned or emergency work must be restored to be detectable or locatable.