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Total Herbaceous Production (2007) <br />• Predictive Equation Value for 2007: 165.33 g/m2 total herbaceous production (based on <br />15. 00 "precipitation value) <br />1985/1986/1987 Rec. Areas 1995/1997 Rec. Areas <br />Xbar 239.46 g/M2 229.27 g <br />S 57.21 59.10 <br />N 25 35 <br />Nmin 10 11 <br />With regard to total herbaceous production, the 1985, 1986, and 1987 reclamation areas and <br />1995 and 1997 reclamation areas significantly exceeded the predicted value for total <br />herbaceous production thereby meeting the final revegetation success criterion. <br />Species Composition (2007) <br />Success 1985/1986/1987 Rec. Areas 1995/1997 Rec. Areas <br />Standard <br />Total Perennial 4 7 8 <br />Species* <br />Warm Season 3 3 4 <br />Grasses* <br />• Cool Season <br />Grasses* 1 3 3 <br />Relative Importance <br />(3%<x<40%) <br />All Species <br />All Species <br />All Species <br />* Numbers reflect only those species meeting the relative importance percentage limitation <br />Both the 1985, 1986, and 1987 reclamation areas and the 1995 and 1997 reclamation areas <br />satisfied the final species composition revegetation criteria. <br />In the 1985, 1986, and 1987 reclamation areas, the seven perennial species were; Calamovilfa <br />longifolia with 24.10 percent relative cover, Bromus marginatus (15.53% relative cover), <br />Bouteloua gracilis (9.37% relative cover), Andropogon hallii (7.50% relative cover), <br />Sporobolus cryptandrus (3.88% relative cover), Artemisia filifolia (3.48% relative cover), <br />and Agropyron smithii (3.35% relative cover). Of these species, Calamovilfa longifolia, <br />Bouteloua gracilis, and Andropogon hallii are qualifying warm season graminoids and <br />Bromus marginatus, Sporobolus cryptandrus, and Agropyron smithii are qualifying cool <br />season graminoids. <br />In the 1995 and 1997 reclamation areas, the eight qualifying perennial species were; Bromus <br />marginatus with 17.35 percent relative cover, Sporobolus cryptandrus (12.98% relative <br />cover), Bouteloua gracilis (11.66% relative cover, Calamovilfa longifolia (9.27% relative <br />cover), Agropyron smithii (7.68% relative cover), Bouteloua curtipendula (5.43% relative <br />• cover), Ambrosia psilostachya (3.84% relative cover), and Andropogon hallii (3.18% relative <br />cover). <br />Coors Energy Company Keenesburg Mine Page 13 <br />2007 Phase III Vegetation Study