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 6 Colow o -Vegetation Cover 2007
West Pit Revegetation -Average Cover Summary
Area > W POO8
Growing Seasons-> 7
Grasses and Grass-likes
N P Agropyron asystac yum is pi e W eatgrass 16.15
N
I P
P Agropyron riparium
Agropyron sibericum Streambank Wheatgrass
Siberian Wheatgrass 4.95
10.80
N
N P
P Agropyron smithii
Agropyron spicatum Western Wheatgrass
Bluebunch Wheatgrass 1.00
0.85
N P Agropyron irachycau/um Slender Wheatgrass 0.25
I P Bromus inennis Smooth Brome 6.10
I A Bromus japonicus Japanese Brome 9.05
I A Bromus tectorum Cheatgrass 10.05
I P Dactylisg/omerata Orchardgrass 1.00
N P E/ymus cinereus Basin Wildrye 1.25
I P Elymusjunceus Russian~Wildrye 3.65
N P Festuca ovina/saximontana Hard Fescue 0.25
I P Poa pratensis Kentucky Bluegrass 1.85
N P Poa secunda Sandberg Bluegrass 0.05
Forbs ~
I P Astraga us cicer Cicer Mi etc 0.95
N B Grindelia squarrosa Curlycup Gumweed 0.10
N P L/num /ewisii Lewis Flax 1.20
I P Medicago saliva j Alfialfa 0.15
Shrubs, Cacti & Trees '
l
N P Artemisia bi entata vas Mtn. Big Sa
ge rus 0.25
N P Atri /ex canescens Four-win Saltbush 2.00

Total Plant Cover 71.90
Rock 0.75
i Litter 20.30
Bare round 7.05

Total Perennial Cover 52.70
Summary by Lifeform:
Perennial Grasses 48.15
Annual Grasses 19.10
Perennial Forbs 2.30
Annual & Biennial Forbs 0.10
Noxious / Aggressive~iWeeds -
Shrubs 2.25
Sample Adequacy Calculations:
Mean = 71.90
Variance = 58.621
n = 20
nmin = 2.00
Rio Tirrto Energy America/Colowyo Mine Page 32 Revegetation Monitoring - 2007
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