Laserfiche WebLink
2003 reclamation area. Warm season graminoids outnumbered cool season graminoids by <br />five to three. Cool season forbs prevailed by six to two over warm season forb species. <br />The 2003 reclamation azea had seven species contributing greater than three percent relative <br />cover this year. The species contributing greater than three percent relative cover included <br />three perennial grasses, one annual grass, and three annual forbs. These species included <br />Helianthus annuus (29.60%), Bromus tectorum (24.61%), Kochia scoparia (18.07%), <br />Sisymbrium altissimum (8.10%), Oryzopsis hymenoides (5.61%), Bouteloua gracilis <br />providing (4.67%), and Agropyron smithii (3.12%). <br />3.2 1985,1986,1987,1995, AND 1997 RECLAMATION AREAS <br />In 2007, the 1985, 1986, 1987, 1995, and 1997 reclamation areas were quantitatively sampled <br />for vegetation cover, total herbaceous production, and species composition. The results and <br />discussion of that sampling is contained in the companion report to this one, 2007 <br />Quantitative Vegetation Study, Phase III Bond Release (Year 1), Coors Energy Company <br />%nesburg Mine, %nesburg, Colorado. <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 regazding yeazly 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 standazd to be achieved, either from the predictive equations in <br />the case of vegetation cover iy=0.0173x3-0.8592x2+14.562x-47.01 ~ and herbaceous <br />roduction 0 3749x2.2485 <br />p (y= . ), or the established standard for species composition. <br />Total Vegetation Cover (20(17) <br />Predictive Equation Yalue for 2007: 36.45 % total vegetation cover <br /> 1998 Rec. <br />Areas 1999 Rec. <br />Areas 2000 Rec. <br />Areas 2002 Rec. <br />Areas 2003 Rec. <br />Areas <br />Xbar 56.40 54.20 57.40 45.60 52.60 <br />S 8.15 6.00 8.44 6.45 8.64 <br />N 10 10 10 10 10 <br />Nmin 7 4 7 7 9 <br />Based on the results of the 2007 quantitative sampling, the 1998, 1999, 2000, 2002, and 2003 <br />reclamation azeas exceeded the predicted total cover vegetation value of 36.45 percent, <br />meeting the final revegetation success criterion for vegetation cover. Area 16, with 32.00 <br />percent cover did not meet the final revegetation success criterion for vegetation cover. <br />Coors Energy Company Keenesburg Mine Page 17 <br />2007 Revegetation Monitoring Report <br />