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(Bromus tectorum), one native annual forb (Helianthus annuus), and one introduced annual <br />forb (Kochia scoparia). The species present in eight of nine years include two additional <br />warm season perennial native grasses, Andropogon hallii and Bouteloua curtipendula <br />(sideoats grama) and two native cool season grasses, Agropyron smithii and Stipa viridula. <br />The core species of the 1998 reseeded or interseeded areas revealed increases in relative <br />cover by all graminoids except Calamovilfa longifolia. Forb species were split in their <br />relative cover this season, with Helianthus annuus increasing significantly in relative cover <br />this growing season while Kochia scoparia deceased significantly. Andropogon hallii, <br />Bouteloua curtipendula, and Stipa viridula showed significant increases in relative cover <br />from last growing season (1167%, not present in 2006, and 384%, respectively). During the <br />2007 season Bouteloua gracilis increased by 170 percent and Calamovilfa longifolia <br />decreased by 41 percent. In the 2007 sampling season relative cover for the cool season <br />annual grass Bromus tectorum increased 243 percent. Helianthus annuus increased 340 <br />percent in relative cover this season, while Kochia scoparia decreased by 83 percent. <br />4.5.21999 Reclamation Areas <br />Quantitative sampling has been undertaken in these areas for the past five growing seasons. <br />A suite of core species that have been present over each of the five years of cover sampling <br />can be identified. There is one cool season grass (Agropyron smithii), two warm season <br />grasses (Andropogon hallii and Calamovilfa longifolia), one cool season annual grass <br />(Bromus tectorum), one perennial forb (Ambrosia psilostachya), and one annual forb (Kochia <br />scoparia). Several species have been present for four of the five sampling years and include; <br />Bouteloua curtipendula, Bouteloua gracilis, Oryzopsis hymenoides, Panicum virgatum, <br />Chenopodium album (lambsquazters), and Helianthus annuus. Notably, the four additional <br />grasses are all native perennials, while the forbs are annuals. <br />As was noted with other areas, perennial graminoids increased this season with respect to <br />relative cover in the community. Both forbs decreased in relative cover this yeaz, Ambrosia <br />psilostachya by four percent and Kochia scoparia by 59 percent. <br />4.5.3 2000 Reclamation Areas <br />Quantitative sampling has been undertaken in the 2000 reclamation areas for the third time in <br />2007. Ten species have been present during each year of sampling; Andropogon gerardii, <br />Andropogon hallii, Bouteloua gracilis, Bromus tectorum, Calamovilfa longifolia, Oryzopsis <br />hymenoides, Panicum virgatum, Ambrosia psilostachya, Kochia scoparia, and Sisymbrium <br />altissimum. General trends for these species in these reclamation areas cannot be <br />extrapolated from the short record at this time. <br />4.5.4.2002 Reclamation Areas <br />Quantitative sampling was conducted in the 2002 reclamation azeas for the second time this <br />season. The short duration of sampling precludes any significant observations regarding long- <br />term trends at this time. <br />Coors Energy Company Keenesburg Mine Page 23 <br />2007 Revegetation Monitoring Report <br />