In addition to complying with the requirements of M.S. § 216D.01-.09 (“Gopher One-Call Excavation Notice System”), as it may be amended from time to time, before the start date of any right-of-way excavation, each registrant who has facilities or equipment in the area to be excavated shall mark the horizontal and vertical placement of all the facilities. Any registrant whose facilities is less than 20 inches below a concrete or asphalt surface shall notify and work closely with the excavation contractor to establish the exact location of its facilities and the best procedure for excavation.