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<br /> <br />' boundries of permit 79-177 was made. Subsequently, an evaluation of the <br />average species composition was made and a proposed species diversity <br />success standard established. <br />Based on these findings, it is proposed that the species diversity on <br />reclaimed areas at the Colorado Yampa Coal Company mine will be deemed to <br />' have been successfully accomplished when three (3) dominant plant species <br />compose no more than 57X of the relative species composition on the re- <br />vegetated site and that a single species composes no more than 43X of the <br />t relative species composition. The plant species composition data used to <br />determine this standard was submitted earlier to CPII.R as part of this <br />submission to conform Permit 79-177 to the permanent State program. The <br />cumulative percent composition from the five natural plant communities is. <br />shown in Figure 1, Comparison of Percent Composition and Number of Species. <br />at Colorado Yampa Coal Company. Figure 2 plots the second derivative of <br />the composition curve in Figure 1. The second derivative shows the <br />' cumulati. difference in the rate of change contributed by each successive <br />Z plant species to the species composition. Examination of Figure 2 and <br />a Average Composition for five Natural communities and it's <br />' derivatives, clearly indicates that a significant shift in species <br />importance occures after three species. It is likewise concluded that if 3 <br />dominant species make up only 57X of the composition on reclaimed sites, <br />they and the species making up the remaining 43X will resemble the relative <br />compositor of a natural community as portrayed in the data presented here. <br />This diversity standard is consistent with the definition for "diverse" <br />presented above and will ultimately be tested, as stated therein, by the <br />' ability of the revegetated mined land to support the postmining land uses <br />in conjunction with production and ground cover requirements. <br />' The varied amounts and types of vegetation to achieve diversity, ground <br />cover, and support the postmining land uses has been integrated into the <br />seed mixtures, cultural practices, and monitoring programs approved in <br />Section 780.18 (b), Revegetation Plan, of permit 79-177 and the response to <br />' special stipulation no. 11. <br />~~~ <br />~~a5e ~SCr~b~~}~r ti,^u~u4f~,n ~ o~ ~~1~, S~oc.~r., n'n.(x~ho~uhR~~ <br />~`Q-/ ~I '~-C ~L~'1rF ~ 1'y' r n ,~ ~ CL rye ,i ~nJ'L.-C~ on,'U 4~ i h Ca r+ftiS 1Z R-C r ~ i , 'L` <br />1 a<<:.~;;1. ~~ <br />' ,~,,~ ~o `t ~ ~ Corrju5in. ; r~ hr~ -I %',c,~ v c~rr,~ •an~ ~ -.~a.•-,, ~,~~ ~amP~s.c . <br />' ~7% 6~-' <br /> <br />3 <br />