CFR /  Title 49  /  Part 193  /  Sec. 193.2167 Covered systems.

A covered impounding system is prohibited except for concrete wall designed tanks where the concrete wall is an outer wall serving as a dike. [Amdt. 193-17, 65 FR 10959, Mar. 1, 2000] Secs. 193.2169-193.2171 [Reserved]