25 Pa. Code § 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.
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