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Species Composition (2009) <br />• <br />of <br />U <br />Area 23 Area 29 <br />Total Perennial 4 6 3 4 <br />Species* <br />Warm Season 3 4 3 3 <br />Grasses* <br />Cool Season 1 1 0 1 <br />Grasses* <br />Relative Importance All Species All Species All Species All Species <br />(3%<x<40%) <br />* Numbers reflect only those species meeting the relative importance percentage limitation <br />From the summary information above, Areas 2, 5, 6, 7, 9, 10, 15, 16, 19, and 29 met or <br />exceeded the final revegetation success criteria values for total vegetation cover, total <br />herbaceous production, and species composition in 2009, thereby demonstrating that the <br />permittee has established a diverse, effective, and permanent vegetative cover of the same <br />seasonal variety as the original vegetation. Area 23 exceeded the final revegetation <br />success criteria for total vegetation cover and total herbaceous production. Area 23 <br />lacked one qualifying cool season grass with three percent or more relative cover to meet <br />the final species composition criterion. It was noted that the cool season native grass, <br />Agropyron trachycaulum contributed two percent relative cover, nearly achieving the <br />minimum cover required for inclusion in the species composition calculation, and thereby <br />meeting the final species composition standard. <br />From the sampling data it was concluded that the revegetated areas are capable of self- <br />regeneration and plant succession. The data shows development of a stable, self- <br />sustaining vegetation community, with seasonality and diversity sufficient to demonstrate <br />successful reestablishment of vegetation on the reclaimed area. <br />Coors Energy Company Keenesburg Mine <br />Phase 11 Bond Release: Areas 2, 5, 6, 7,9,10, 15, 19, 23, and 29 <br />Success Areas 2, 5, 6, 7, 9, 10, <br />Standard 15, 16, and 19 <br />Page 5