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Total Herbaceous Production (2009) <br />• Predictive Equation Value for 2009: 135.07g/m2 total herbaceous productions <br />2002 Reclamation 2006 Reclamation <br />Areas Area <br />Xbar 190.88 189.59 <br />S 41.72 55.31 <br />N 15 15 <br />Nmin 15 26 <br />Both the 2002 and 2006 reclamation areas exceeded the predicted value for total herbaceous <br />production, thereby meeting the final revegetation success criterion. <br />Species Composition (2009) <br />U <br />is <br /> Success <br />Standard 2002 Reclamation <br />Areas 2006 Reclamation <br />Area <br />Total Perennial Species* <br />(>3% rel. cover) 4 3 3 <br />Warm Season Grasses* 3 1 1 <br />Cool Season Grasses* 1 0 2 (see below) <br />Relative Importance All <br />Species <br />All Species Indian Ricegrass <br />(3%<x<40%) exceeds 40% R.I. <br />* Numbers reflect only those species meeting the relative importance percentage limitation <br />None of the reclamation areas sampled in 2009 satisfied the final species composition <br />revegetation success criteria. The 2002 reclamation areas lacked the required number of <br />warm and cool season grasses. The 2006 reclamation area did not qualify as Oryzopsis <br />hymenoides relative cover exceeded the 40 percent upper limit, and lacked two qualifying <br />warm season graminoids. <br />4.0 DISCUSSION AND CONCLUSIONS <br />Areas at the mine that were revegetated in 2002 and 2006 were quantitatively sampled in <br />2009 to evaluate revegetation establishment for monitoring purposes, and identify any areas <br />that require implementation of additional measures to ensure long-term revegetation success. <br />4.1 2009 PRECIPITATION REGIME <br />The climate of the mine and surrounding area is characterized by a wide temperature <br />fluctuation; from below freezing in winter, to very warm in the summer months. <br />Precipitation in the area is provided by weather systems originating in the Gulf of Mexico <br />and is most frequent and reliable during the spring and late summer months (Table 5). <br />Coors Energy Company Keenesburg Mine Page 12 <br />2009 Revegetation Monitoring Report