2011-03-03_REVISION - C1981028 (3)

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Species Composition The species composition success criterion requires that there be at least four perennial species, of which three are warm season grasses and one a cool season grass. No one component of the above four species should comprise greater than 40% relative importance nor less than 3% relative importance. Relative importance will be measured by calculating relative cover of the revegetation species. Vegetation species which may be used in the calculation of species composition may be any plant species not defined as a noxious or prohibited plant species, and may be native or introduced. Species Composition (2009) Success 1998/1999/2000 Rec. Areas Standard Total Perennial 4 6 Species* Warm Season 3 4 Grasses* Cool Season I 1 Grasses* Relative Importance All Species All Species (3%<x<40%) Species Composition (2010) Success 1998/1999/2000 Rec. Areas Standard Total Perennial 4 5 Species* Warm Season 3 4 Grasses* Cool Season I 1 Grasses* Relative Importance All Species All Species (3%<x<40%) * Numbers reflect only those species meeting the relative importance percentage limitation From the summary information above, the 1998, 1999, and 2000 reclamation areas exceeded the final revegetation success criteria values for total vegetation cover, total herbaceous production, and species composition in 2009 and 2010, thereby demonstrating that the permittee has established a diverse, effective, and permanent vegetative cover of the same seasonal variety as the original vegetation. The revegetated area is capable of self-regeneration and plant succession. The data shows development of a stable, self- sustaining vegetation community, with seasonality and diversity sufficient to demonstrate successful reestablishment of vegetation on the reclaimed area. • Coors Energy Company Keenesburg Mine Page 5 Phase III Bond Release: Areas 2, 5, 6, 7, 9, 10, 19