37 Miss. Code R. § 1-7501-04001-300
Underground utility lines crossing dirt or gravel surfaced highways, frontage roads, intersecting roads and streets maintained by the Department may be accomplished by open trenching. After the encasement or the carrier pipe is laid, the trench will be immediately backfilled in lifts not exceeding six (6) inches thick, each lift being compacted to a density equal to or exceeding that of the adjacent material. The original surface will be restored. Where the facility to be crossed is open to traffic, one traffic lane will be kept open at all times. Underground utility lines crossing treated design soils, sub-bases, bases or pavements of highways, frontage roads, and intersecting roads and streets maintained by the Department will be accomplished by jacking, dry boring, boring with drilling fluids tunneling or directional boring in accordance with the requirements listed on Permit Form MND-002, Application for Permit to Construct Pipeline Along or Across State Highway, etc., Attachment A, Jacking, Dry Boring, Boring with Drilling Fluids, Tunneling and Directional Boring.
37 Miss. Code. R. § 1-7501-04001-300