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approved for portions of the West Ridge Area. Details on these variances can be found in Section 4.3.1 and in Exhibits 4.3-1 and 2-3.1 of the PAP. 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 rotocleaz technique for removal of vegetation. The rotoclear method chopped standing vegetation, which was then incorporated into the salvaged topsoil (PAP, Page 4.3-1). IV. Sealing of Drilled Holes and Underground Openings A. The Division finds that each hole, well or other underground opening has been, or is to be, capped, sealed, backfilled, or otherwise properly managed (Rule 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 Rule 4.09.1. Spoils from the initial box cut at the Moffat Area were cast southward 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 [Rule 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 areas. These terraces aze 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 azeas~b. The check dams in the West Ridge drainage are commonly referred to as the "String of Pearls". Both the West Ridge and Center Ridge watercourses aze 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. stotm 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. 's Page 4 of Appendix 4.6-M in Volume 11 a of the PAP " Page 3 ofAppendix 4.6-M in Volume l la ofihe PAP C-1980-001 Permit Renewal 5 Findings Page 28 of 33 Pages