(a) An excavator performing excavation or demolition at an underground facility shall backfill such excavation with materials and in such manner as specified by the operator or, in the absence of such specifications, with suitable materials and in such manner as will avoid damage to, and provide proper support for, such underground facility and its protective coating both during and after backfilling operations.
(b) The excavator shall not place large rock, frozen earth, rubble, debris or other heavy or sharp materials or objects which could cause damage to or scraping against any underground facility.
(c) The backfill beneath and around any underground facility shall be properly compacted in accordance with generally accepted engineering practice.
(d) Heavy loads and excessive forces shall not be imposed on any exposed underground facility at any time during backfilling operations.