After a well is completed or plugged and abandoned, all drilling mud remaining in such pits shall be safely returned to the well on location or an acceptable adjacent well, or removed to a lawfully approved landfill, or disposed of as directed by the Commission, within ninety (90) days of completion of the well, except as otherwise approved by the Commission. Pits shall be backfilled with earth and leveled in such a manner as to be returned to a near natural state. The construction and operation of such tanks and pits shall be in complete compliance with all relevant rules, regulations, and requirements of other local, state, and federal agencies.
S.C. Code Regs. § 121-8.26