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Total Herbaceous Production (2007) <br />Predictive Equation Value for 2007: 165.33 g/m2 total herbaceous productions <br /> 1998 Rec. 1999 Rec. 2000 Rec. 2002 Rec. 2003 Rec. <br /> Areas Areas Areas Areas Areas <br />Xbar 115.75 150.84 125.55 99.87 135.51 <br />S 45.67 70.51 37.06 40.77 69.56 <br />N 15 15 15 15 15 <br />Nmin 48 68 27 52 82 <br />With regazd to total herbaceous production, only the 1999 reclamation azeas met the <br />predicted value for total herbaceous production (utilizing a statistical evaluation) thereby <br />meeting the final revegetation success criterion. It was noted that all areas exhibited high <br />variance in their sample values. <br />Species Composition (2007) <br /> <br />• <br />Success 1998 Rec. 1999 Rec. 2000 Rec. 2002 Rec. 2003 Rec. <br />Standard Areas Areas Areas _ _ Areas Areas <br />Total Perennial <br />Species* <br />Warm Season <br />Grasses* <br />Cool Season <br />Grasses* <br />Relative Importance <br />(3%<x<40%) <br />4 4 5 3 0 3 <br />3 3 2 2 0 1 <br />1 1 1 0 0 2 <br />All Species All Species All Species All Species All Species All Species <br />* Numbers reflect only those species meeting the relative importance percentage limitation <br />Of the azeas sampled in 2007, the 1998 reseeded or interseeded areas satisfied the final <br />species composition revegetation success criteria. The 1999 reclamation areas did not qualify <br />as Calamovilfa longifolia relative cover exceeded the 40 percent upper limit. The 2000 and <br />2002 reclamation areas lacked the required number of warm and cool season grasses. The <br />2003 reclamation areas exceeded the cool season grass criterion, but lacked adequate <br />numbers of warms season grass species. Area 16 from 1995 did not meet the requisite <br />number of perennial species, warm season or cool season grasses. <br />4.0 DISCUSSION AND CONCLUSIONS <br />Area 16 seeded in 1995, azeas reseeded or interseeded in 1998 and those revegetated in 1999 <br />and 2000, 2002, and 2003 were quantitatively sampled in 2007 to evaluate revegetation <br />establishment for monitoring purposes, and identify any azeas that require implementation of <br />additional measures to ensure long-term revegetation success. <br />Coors Energy Comparry Keenesburg Mine Page 18 <br />2007 Revegetation Monitoring Report <br />