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mine azea will flow, via a series of conveyance culverts and ditches, to the sediment ponds, which aze located on either side of the combination hauUaccess road adjacent to the alluvial valley. The sediment ponds, which aze adequately sized to contain the runoff from a 10-yeaz, 24-hour storm, will not discharge until a storm event of this magnitude has been exceeded. National King Coal has committed to an extensive water quality sampling plan, should the ponds dischazge due to mine portal discharges. The sampling plan should be an effective method of determining the extent, if any, of impacts which are occurring to the alluvial aquifer system. It is thought, that, due to the great quantity of water transported within the alluvial aquifer, the effects of surface drainage to the AVF will be immediately mitigated. IV. Topsoil Information pertaining to baseline soil urventory is presented in Section 2.04.9 of the permit application. Information pertaining to topsoil replacement is presented in Section 2.05.4. No baseline surveying of the soils was performed in the mine facilities azea due to previous disturbances. Instead, a survey by the Soil Conservation Service was performed for adjacent, undisturbed areas. This survey identified three soil mapping units as addressed in Section 2.04.9 and depicted on Map C-6 of the permit application. Approximately 1.5 acres are to be disturbed at the end of the life of mine as a topsoil borrow area. The owner of the land has allowed access and rights for a topsoil borrow area to be used for reclamation purposes. All available topsoil and suitable growth medium have been analyzed and the results are located in Appendix 9. The location of the topsoil borrow azea is indicated on Map C-4. V. Sealing of Drilled Holes and Underground Openings Information pertaining to the sealing of drill holes and portal and ventilation openings is presented in Section 2.05 of the permit application. All portal and ventilation entries will be permanently sealed by backfilling each opening with underground development waste, common fill, and sediment from the two sediment ponds for a distance of 50 feet from the entrance. Once backfilling is completed, each entry will be collapsed with explosives. National King Coal has adequately demonstrated that sufficient quantities of fill material exist on site to complete both portal and mine bench backfilling activities. A single drill hole currently exists at the mine site in Hay Gulch and is used as a water well. The landowner has requested that this well remain open following permanent cessation of operation. The Division previously agreed with this request and hereby reaffirms this previous approval. Therefore, the drill hole is not required to be sealed. (4.07). 17