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2006 reclamation area, ten were native and six were introduced. Perennial species <br />outnumbered annual species by nine to six, with one biennial species. Cool season species <br />is were slightly more prevalent than warm season species (nine cool season to seven warm <br />season) this year. Warm season graminoids were represented by five species and cool <br />season graminoids included four species. Five forb species were identified as cool season <br />and two were warm season. <br />The 2006 reclamation area had five species contributing greater than three percent relative <br />cover this year. These species included Oryzopsis hymenoides (66.09%), Bromus tectorum <br />(9.28%), Agropyron trachycaulum (6.38%), Calamovilfa longifolia (4.35%), and Mehlotus <br />officinalis (4.06%). <br />3.2 1998,1999, 2000, AND 2003 RECLAMATION AREAS <br />In 2009, the 1998, 1999, 2000, and 2003 reclamation areas were quantitatively sampled for <br />vegetation cover, total herbaceous production, and species composition. The results and <br />discussion of that sampling is contained in companion reports to be submitted with the future <br />bond release requests. <br />3.3 COMPARISON OF RECLAMATION AREAS WITH FINAL REVEGETATION <br />SUCCESS CRITERIA <br />Monitoring of the revegetated areas allows for the identification of vegetation community <br />development trends during the extended liability period. This evaluation also assists in <br />• decisions regarding yearly grazing, husbandry practices, interseeding, fertilizing, and weed <br />management. Comparison of the reclaimed area values for vegetation cover, herbaceous <br />production, and species composition with the final revegetation success criteria, indicates <br />whether revegetation has been successful, or whether additional measures need to be initiated <br />to enhance vegetation community development. The tables below allow the comparison of <br />the parameter values with the standard to be achieved, either from the predictive equations in <br />the case of vegetation cover (y=0.0173x3-0.8592x2+14.562x-47.015) and herbaceous <br />production (v=0.3749x2.2485), or the established standard for species composition. <br />Total Vegetation Cover (2009) <br />Predictive Equation Value for 2009: 35.69 % total vegetation cover <br />2002 Reclamation 2006 Reclamation <br />Areas Area <br />Xbar 61.20 53.20 <br />S 13.34 8.50 <br />N 10 10 <br />Nmin 16 9 <br />Based on the results of the 2009 quantitative sampling, the 2002 and 2006 reclamation areas <br />exceeded the predicted total cover vegetation value of 35.69 percent, meeting the final <br />• revegetation success criterion for vegetation cover. <br />Coors Energy Company Keenesburg Mine Page 11 <br />2009 Revegetation Monitoring Report