(a) Prior to July 1, 1991, requirements for sediment control shall be as provided in existing erosion and sediment control regulations promulgated September 26, 1980. Also, until July 1, 1991, any state or locally developed regulation or criterion for stormwater management shall remain in effect at the discretion of the implementing authority.
(b) Projects approved prior to July 1, 1991, but which are under construction after July 1, 1991, shall be subject to the penalty provisions contained in § 4015 of this title.