Part 40, Criteria C for States The eight paragraph of Appendix A, Relating to the with authority Criterion 4(d) is revised to section I, Operation of for Uranium read as follows: Criterion 4(d) Uranium Mills Mills/tailings; and the Disposition of D for States Criterion 4. * * * Tailings for without (d) *** Rock covering of slopes Wastes authority may be unnecessary where top Produced by covers are very thick (on the the Extraction order of 10 m or greater); or impoundment slopes are very Concentration gentle (on the order of 10 h:1v of Source or less); bulk cover materials material from have inherently favorable ores erosion resistance processed characteristics; and, there is primarily for negligible drainage catchment their Source area upstream of the pile and Material good wind protection as Content described in points (a) and (b) of this Criterion.
Part 40, Appendix A, section I, Criterion 4(d) Criteria Relating to the Operation of Uranium Mills and the Disposition of Tailings for Wastes Produced by the Extraction or Concentration of Source material from ores processed primarily for their Source Material Content C for States with authority for Uranium Mills/tailings; D for States without authority The eight paragraph of Criterion 4(d) is revised to read as follows: Criterion 4. * * * (d) *** Rock covering of slopes may be unnecessary where top covers are very thick (on the order of 10 m or greater); impoundment slopes are very gentle (on the order of 10 h:1v or less); bulk cover materials have inherently favorable erosion resistance characteristics; and, there is negligible drainage catchment area upstream of the pile and good wind protection as described in points (a) and (b) of this Criterion.
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