IMPOUNDMENTS
§ 289.271. General requirements.
(a) Impoundments shall be designed, constructed, operated and maintained in accordance with the following:
(1) An impoundment shall have sufficient freeboard to prevent overtopping, including overtopping caused by the 24-hour precipitation event in inches to be expected once in 25 years. The freeboard may not be less than 2 feet.
(2) The dike shall have sufficient structural integrity to prevent failure. The liner system of the impoundment may not be considered in determining the structural integrity of the dike.
(3) The dike shall be capable of withstanding anticipated static and dynamic loadings with a minimum safety factor for the most critical failure surface of 1.5 for static loading and 1.2 for dynamic loading.
(4) An impoundment shall be equipped so that flow of residual waste into the impoundment can be shut off immediately.
(5) Dikes and berms shall be free of burrowing mammals and plants with root systems capable of displacing earthen materials upon which the structural integrity of the dikes or berms is dependent.
(6) An impoundment shall be surrounded by structures sufficient to prevent surface runoff from a 25-year, 24-hour precipitation event from entering the impoundment.
(7) Odors and the dispersal of residual waste or waste constituents by wind and water erosion shall be prevented.
(b) Residual waste may not be disposed in tanks.
Cross References This section cited in 25 Pa. Code § 287.114 (relating to interim operational requirements for unpermitted processing or disposal facilities); 25 Pa. Code § 287.115 (relating to filing by permitted facilities); 25 Pa. Code § 287.116 (relating to interim operational requirements); 25 Pa. Code § 289.161 (relating to impoundment plan); and 25 Pa. Code § 299.144 (relating to operating requirements).
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