40 CFR § 264.227 - Emergency repairs; contingency plans.
(1) The level of liquids in the impoundment suddenly drops and the drop is not known to be caused by changes in the flows into or out of the impoundment; or
(2) The dike leaks.
(1) Immediately shut off the flow or stop the addition of wastes into the impoundment;
(2) Immediately contain any surface leakage which has occurred or is occurring;
(3) Immediately stop the leak;
(4) Take any other necessary steps to stop or prevent catastrophic failure;
(5) If a leak cannot be stopped by any other means, empty the impoundment; and
(6) Notify the Regional Administrator of the problem in writing within seven days after detecting the problem.
(d) No surface impoundment that has been removed from service in accordance with the requirements of this section may be restored to service unless the portion of the impoundment which was failing is repaired and the following steps are taken:
(2) If the impoundment was removed from service as the result of a sudden drop in the liquid level, then:
(ii) For any other portion of the impoundment, the repaired liner system must be certified by a qualified engineer as meeting the design specifications approved in the permit.
(e) A surface impoundment that has been removed from service in accordance with the requirements of this section and that is not being repaired must be closed in accordance with the provisions of § 264.228.