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Total Vegetation Cover (2009) <br />Areas 2, 5, 6, 7, 9, 10, 15, 16, and 19 Area 23 Area 29 <br />96% <br />60 <br />X 68.00% 61.60% <br />. <br />bar <br />S 7.41 n/a 4.85 <br />N 46 1 15 <br />Nmin 3 n/a 1 <br />Total Herbaceous Production <br />The revegetation success criterion for total herbaceous production for the Keenesburg <br />Mine is a predictive equation based on cumulative precipitation amounts during the <br />period from September-July. The predictive equation for total herbaceous production is <br />y=O.3749x2.2481, where x is the cumulative amount of precipitation and y is the total <br />herbaceous production (in g/m2). <br />The total herbaceous production success criterion value for 2009 was calculated to be <br />135.07 g/m2 (based on 13.71" precipitation value). <br />Total Herbaceous Production (2009) <br /> Areas 2, 5, 6, 7, 9, 10, 15, 16, and 19 Area 23 Area 29 <br />Xbar <br />S 261.13g/m2 <br />56.60 169.00 g/m2 <br />n/a 268.63 g/m2 <br />81.81 <br />N 61 1 25 <br />Nmin 8 n/a 16 <br />Species Composition <br />The species composition success criterion requires that there be at least four perennial <br />species, of which three are warm season grasses and one a cool season grass. No one <br />component of the above four species should comprise greater than 40% relative <br />importance nor less than 3% relative importance. Relative importance will be measured <br />by calculating relative cover of the revegetation species. Vegetation species which may <br />be used in the calculation of species composition may be any plant species not defined as <br />a noxious or prohibited plant species, and may be native or introduced. <br />• <br />Coors Energy Company Keenesburg Mine Page 4 <br />Phase 11 Bond Release: Areas 2, 5, 6, 7, 9, 10,15, 16,19, 23, and 29