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B. The Division previously waived the requirement for clearing vegetative cover prior to topsoil removal. The applicant has demonstrated that inclusion of vegetative material in salvaged topsoil is necessary or desirable to ensure soil productivity consistent with the post-mining land use. The operation utilized a rotoclear technique for removal of vegetation. The rotoclear method chopped standing vegetation, which was then incorporated into the salvaged topsoil. N. Sealing of Drilled Holes and Underground Openings A. The Division will require that each hole, well or other underground opening be capped, sealed, backfilled, or otherwise properly managed (4.07.3). V. Backfilling and Grading A. The Division has previously approved the retention of box cut spoil or initial cut spoil outside the pit area since the applicant demonstrated that such material is not required to achieve approximate original contour in accordance with 4.09.1. Spoils from the initial box cut at the Moffat Area were cast southwazd onto previously mined Center Ridge spoils. The area was mined prior to August 3, 1977, and no topsoil was salvaged. Spoils were graded and revegetated (4.14.1(2)(d)). B. In order to conserve soil moisture, ensure stability, and control erosion on final graded slopes the Division has previously approved 14 cut-and-fill terraces for the previously mined West Ridge area (page 4 of Appendix 4.6-M in Volume lla of the permit application). These terraces are compatible with the post-mining land use, and will meet all the requirements of Rule 4.14.2(2). C. The Division has previously approved as permanent 21 check dams in the West Ridge and Center Ridge Mining areas (page 3 of Appendix 4.6-M in Volume lla of the permit application). The check dams in the West Ridge drainage aze commonly referred to as the "String of Pearls". Both the West Ridge and Center Ridge watercourses are ephemeral. In accordance with Rules 4.05.3 and 4.05.4, the spillways are designed to safely pass the peak flow from a 24-hr. storm event of either 10-yr. recurrence or 25-yr. recurrence, depending on whether the drainage area is less than or more than one square mile. VI. Revegetation A. The Division has previously approved the use of introduced species in the reclamation seed mix. The applicant has submitted information which Edna Mine 24 Permit Renewal No. 4