§ 77.573. Stability analysis.
An operator shall provide a stability analysis whenever he requests a waiver to develop a working face greater than 50 feet in consolidated rock under § 77.571(2) (relating to bench development) or a waiver to remove lower benches on the final working face, other than the removal of benches as part of the reclamation slope. The stability analysis shall include, at a minimum:
(1) A stereo net analysis, or acceptable equivalent analysis, of the geologic structure of the working face on which the proposal is submitted.
(2) Identification of manmade features within a distance equivalent to three times the maximum proposed depth of the pit measured from the maximum lateral extent of the final working face.
(3) Other stability related information the Department may request.
Source The provisions of this § 77.573 adopted March 16, 1990, effective March 17, 1990, 20 Pa.B. 1643.
Cross References This section cited in 25 Pa. Code § 77.571 (relating to bench development); and 25 Pa. Code § 77.594 (relating to final slopes).
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