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XXII. Sealing of Drilled Holes and Underground Upenings - Rules The applicant proposes to seal drilled holes by returning the drill cuttinys to the bore hole. Rules 4.01.3(1) and (2) require the placement of an appropriate mechanical plug and concrete poured column near the surface of each bored hole. The applicant should amend the application document appropriately. If future drilling encounters water zones, the Division should be notified, since it might be desirable to retain the Boles as monitoring wells. XXIII. Special Categories of Mining Uther Than NVF and Prime Farmland - Rulcc 7 11~ d 79 d 'J "2 d 7ti A 77 nn.i A 7Q Rule 2.06.9 - Special Categories of Mining - Auger Plining In general, the augering scheme appears acceptable. However, a few items require additional description within the amended application document. Neither the text of this section nor the schematic Figure No. 1 on page V-16, mentioned the salvaging of topsoil prior to mining. The application should be appropriately amended. The question regarding backfilling of the augered areas to achieve approximate oriyinal contour must be resolved, as discussed under Section XVI of this letter. Further, the applicant's observation that augering downdip will preclude drainage from the augered bore holes is insufficient. The applicant should expand this discussion to demonstrate that the hydroloyic heads encountered will not be sufficient to cause ground water flow from the bore openings, and provide a detailed description of the method of sealiny the auger openings. XXV. Miscellaneous Compliance - Rules 2.05.6(5), 4.02, 4.12, 4.19, 4.21, 4.28 and 4.30 The Grassy Creek Mine has experienced slides along the cut slopes on the haul road. Because this landslide potential demonstrably exists, the applicant is required to include a statement in the application which demonstrates an intent to comply with Rule 4.12(2). /ep Doc. IVo. 1852