2008-03-13_REPORT - C1981019 ‎(2)‎

• Permit No: C1981019
• IBM Index Class Name: REPORT
• Doc Date: 3/13/2008
• Doc Name: 2007 AHR 2007 Revegetation Monitoring Report
• From: Colowyo Coal Company
• To: DRMS
• Annual Report Year: 2007
• Permit Index Doc Type: Hydrology Report
• Email Name: SB1
• Media Type: D
• Archive: No

Table 8 Colow o - Ve etation Cover - 2007 ~ (Page 2 of 2
Reference Areas -.Average Cover Summary Continued
Reference Area -> Mountain Sagebrush Improved Target Target Sage
Shrub Pasture Grassland Grouse
Shrubs, Cacti & Trees ~
ac ieruta ensis to rvice erry 1.1 ! - - 0. 0
N P Artemisia Cana Silver Sage - - ~ - - 0.20
N P Artemisra bidentata vas Mtn. Big Sagebrush 11.30 10.00 ~ - 0.05 4.05
N P Ceratoides /anata Winterfat - 0.20 - 0.15 -
N P Chrysothamnusnauseasus Rubber Rabbitbrush 0.30 - - - -
N P Chrysod~amnus visddiflorus Low Rabbitbrush 0.30 0.40 - 1.45 5.25
N P Guberrezia saroth~ae Snakeweed - 1.05 i - 7.20 13.00
N P Mahonia repens Creeping Barberry 0.05 - i - - 0.10
N P Prunus virginiana Chokecherry - - - - 0.20
N P Querrvsgambellil GambelOak 2.75 - - - -
N P S horica oreo h!lus Mountain Snowber 4.40 2.20 ( - - -

Total Plant Cover 56.35 57.25 ! 57.25 43.05 61.10
Roc 0.65 2.95 I - 1.35 0.10
Litter 33.60 29.05 ~ 40.40 33.35 28.00
Bare round 9.40 10.75 i 2.35 22.25 10.80
Total Perennial Cover 51.35 41.95 ~ 56.10 32.50 47.55
Summa b Lifeform: '
Perennial Grasses 29.30 22.30 ~ 55.25 22.40 23.30
Annual Grasses 4.55 12.75 j 1.10 6.40 10.80
Perennial Forbs 2.15 4.65 ~ 0.85 1.25 1.25
Annual & Biennial rrorbs 0.45 2.55 ~ - 4.15 2.75
Noxious /Aggressive Weeds - - ! 0.05 - -
Shrubs 19.90 15.00 ~ - 8.85 23.00
Sam le Ad ua Calculations:
Mean = 56.35 57.25 I 57.25 43.05 61.10
Variance = 83.397 148.934 ~ 105.355 38.155 87.989
n = 20 20 20 20 20
nm,,, = 4.63 8.01 5.67 3.63 4.15
Rio Tinto Energy America/Colovvyo Mine
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Page 38 Revegetation Monitoring - 2007
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