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standard for species composition. All reclamation areas were compared to the reference azea <br />statistically using the Students t test for equivalency of means. <br />Total Vegetation Cover (2005) <br />Reference 1998 Rec. <br />Area Areas <br />LJ <br /> <br />1999 Rec. <br />Areas <br />2000 Rec. <br />2002 Rec. <br />Areas <br />Xbar 60.40 57.60 51.40 49.60 53.00 <br />S 3.75 5.95 9.00 9.51 4.24 <br />N 10 10 ]0 10 2 <br />Nmin 1 4 10 12 2 <br />Based on the results of the 2005 quantitative sampling the 1998 reseeded or interseeded areas <br />were equal to the Osgood sand reference azea in total vegetation cover. The 1994, 2000 and <br />2002 reclamation azeas did not achieve the same level of total vegetation cover as the <br />reference azea; therefore they did not meet the final revegetation success criterion. <br />Total Herbaceous Production (2005) <br /> Reference <br />Area 1998 Rec. <br />Areas 1999 Rec. <br />Areas 2000 Rec. <br />Areas 2002 Rec. <br />Areas <br />Xbar 117.80 94.11 107.11 86.72 184.70 <br />S 36.63 27.21 43.44 53.58 114.13 <br />N 15 IS 15 15 2 <br />Nmin 30 26 51 118 118 <br />With regazd to total herbaceous production, the 1999 and 2002 reclamation azeas equaled or <br />exceeded the requirement the reference area value thereby meeting the final revegetation <br />success criterion for total herbaceous production. The 1998 reseeded or interseeded areas and <br />the 2000 reclamation azeas did not meet the final revegetation success criterion for <br />herbaceous production. <br />Species Composition (2005) <br />Total Perennial <br />Species* <br />Warm Season <br />Grasses* <br />Perennial Forbs* <br />Relative Importance <br />(3%<x<40%) <br />Success Osgood 1998 1999 2000 2002 <br />itandard Sand Ret Areas Areas Areas Areas <br />7 2 3 6 3 6 <br />4 0 3 3 3 4 <br />1 0 0 2 ] 1 <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 />Coors Energy Company Keenesburg Mine <br />2005 Revegetation Monitoring Report <br />Page 20 <br />