South Carolina Code of Regulations
Chapter 61 - DEPARTMENT OF HEALTH AND ENVIRONMENTAL CONTROL
Subchapter 61-92 - UNDERGROUND STORAGE TANK CONTROL REGULATIONS
Part 280 - TECHNICAL STANDARDS AND CORRECTIVE ACTION REQUIREMENTS FOR OWNERS AND OPERATORS OF UNDERGROUND STORAGE TANKS (UST)
Subpart G - OUT-OF-SERVICE UST SYSTEMS AND CLOSURE
Section 61-92.280.G.71 - PERMANENT CLOSURE AND CHANGES-IN-SERVICE

(a) At least 30 days before beginning either permanent closure or a change-in-service under paragraphs (b) and (c) of this section, or within another reasonable time period determined by the Department, owners and operators must notify the Department in writing of their intent to permanently close or make the change-in-service, unless such action is in response to corrective action. At least 30 days before replacing previously installed piping or previously installed dispensers, owners and operators must notify the Department in writing of their intent. The required assessment of the excavation zone under Section 280.72 must be performed after notifying the Department but before completion of the permanent closure or a change-in-service.

(b) To permanently close a tank, owners and operators must empty and clean it by removing all liquids and accumulated sludges. All tanks taken out of service permanently must be removed from the ground, filled with an inert solid material, or closed in place in a manner approved by the Department.

(c) Continued use of an UST system to store a non-regulated substance is considered a change-in-service. Before a change-in-service, owners and operators must empty and clean the tank by removing all liquid and accumulated sludge and conduct a site assessment in accordance with Section 280.72. A change-in-service also includes switching from a non-regulated substance to a regulated substance.

[Note to Section 280.71. The following cleaning and closure procedures may be used to comply with this section: