2009-03-16_REVISION - C1981028 ‎(4)‎

• Permit No: C1981028
• IBM Index Class Name: REVISION
• Doc Date: 3/16/2009
• Doc Name: Bond Release Application
• From: Savage & Savage
• To: DRMS
• Type & Sequence: SL4
• Email Name: JHB
• Media Type: D
• Archive: No

Predictive Equation Value for 2008: 39.66 g/m2 total herbaceous production (based on
• 7 95"precipitation value)
1985/1986/1987 Rec. Areas 1995/1997 Rec. Areas
Xbar 144.68 174.86
S 32.08 52.44
N 15 25
Nmin 9 16
With regard to total herbaceous production, the 1985, 1986, and 1987 reclamation areas and
1995 and 1997 reclamation areas significantly exceeded the predicted value for total
herbaceous production thereby meeting the final revegetation success criterion.
Species Composition (2008)
Success 1985/1986/1987 Rec. Areas 1995/1997 Rec. Areas
Standard
Total Perennial 4 7 7
Species*
Warm Season 3 4 4
Grasses*
Cool Season 1 2 2
Grasses*
Relative Importance
•
(3%<x<40%) All Species All Species All Species
* Numbers reflect only those species meeting the relative importance percentage limitation
Both the 1985, 1986, and 1987 reclamation areas and the 1995 and 1997 reclamation areas
satisfied the final species composition revegetation criteria.
In the 1985, 1986, and 1987 reclamation areas, the seven qualifying perennial species were;
Bromus marginatus (32.11%), Bouteloua gracilis (20.35%), Calamovilfa longifolia
(11.40%), Andropogon hallii (7.19%), Sporobolus cryptandrus (5.61%), Agropyron
cristatum (3.68%), and Ambrosia psilostachya (3.16%). Of these species, Bouteloua gracilis,
Calamovilfa longifolia, Andropogon hallii, and Sporobolus cryptandrus are qualifying warm
season graminoids and Bromus marginatus, and Agropyron cristatum are qualifying cool
season graminoids.
In the 1995 and 1997 reclamation areas, the seven qualifying perennial species were;
Calamovilfa longifolia (19.14% percent relative cover), Bromus marginatus and Sporobolus
cryptandrus (18.60 percent relative cover each), Bouteloua gracilis (11.45%), Bouteloua
curtipendula (7.16%), Agropyron smithii (6.44%), and Ambrosia psilostachya (3.94%). Of
these species, Calamovilfa longifolia, Sporobolus cryptandrus, Bouteloua gracilis, and
Bouteloua curtipendula are qualifying warm season graminoids and Bromus marginatus and
. Agropyron smithii are qualifying cool season graminoids.
Coors Energy Company Keenesburg Mine Page 13
2008 Phase III Vegetation Study