25 Pa. Code § 290.403 – Surface and groundwater protection.

(a) Surface water runoff from storage areas shall be minimized. Stormwater shall be managed in accordance with The Clean Streams Law (35 P. S. § § 691.1—691.1001) and the regulations promulgated thereunder.
(b) Surface water run-on to storage areas shall be minimized.
(c) Coal ash may not be stored in a manner that causes groundwater or surface water degradation.