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Section 816.97 (d) Continued. Rule 4.15 <br />Revised 1/5/81 <br />Sion structures, restoration of the approximate original contour, <br />and implementation of the revegetation plan set forth in Section <br />780.18. As fully described in Section 780.16, aquatic communities <br />of the Kerr Tipple Area will be protected by maintenance of the <br />sedimentation pond and implementation of dust control measures. <br />Riparian Vegetation <br />The description of the riparian vegetation found in Bush and <br />Williams Draw which was deemed acceptable by CMLRD on October 27, <br />1980 is found on pages 785-14 to 785-15. According to this dis- <br />cussion Kerr Coal has reported that vegetation confined to the <br />riparian zone is not a homogeneous type but is actually composed of <br />four small vegetation types which are confined to an area of ap- <br />proximately 100 feet wide. <br />A separate seed mixture for this area is impractical due to the <br />biological diversity present. Specifically, of the seven species <br />identified (page 785-15) as growing on these sites, all those <br />worthy of planting have already been included in the Kerr Mine Area <br />seed mixture. At this time revegetation research is being con- <br />ducted on only three of the species found in the subject draws, <br />namely bluegrass, western wheatgrass and hairgrass. Bluegrass and <br />western wheatgrass have both been included in the mixture because <br />seed is available for these species and planting techniques are <br />documented. Hairgrass, to our knowledge, is not available from any <br />source and has been planted only on small research plots using seed <br />collected solely for experimental purposes. Kerr Coal has reviewed <br />several lists of native plant dealers and know of no dependable <br />source or propagation for this species. It would be infeasible for <br />Kerr Coal to attempt to seed Nebraska sedge, wiregrass, chinquefoil <br />or silver sagebrush, primarily because there are no dependable pro- <br />pagation techniques for these species. Nor are there sufficient <br />seed stocks of these species growing in these areas to justify hand <br />816-118 aaaaa <br />