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2015-02-26_REPORT - C1981028 (7)
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2015-02-26_REPORT - C1981028 (7)
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Last modified
3/29/2017 10:35:21 AM
Creation date
2/26/2015 12:52:00 PM
Metadata
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Template:
DRMS Permit Index
Permit No
C1981028
IBM Index Class Name
Report
Doc Date
2/26/2015
Doc Name
Annual Hydrology and Reclamation Report
From
Coors Energy Company
To
DRMS
Annual Report Year
2014
Permit Index Doc Type
Annual Reclamation Report
Email Name
TNL
DIH
Media Type
D
Archive
No
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Keenesburg Mine 2014 Vegetation Monitoring Report <br />6 DISCUSSION <br />6.1 Vegetation Cover <br />Based on the results of the quantitative sampling, Reclamation Area 30 met the total cover <br />vegetation success standard by exceeding 90% of the total vegetation cover calculated standard <br />value (Table 7). Reclamation Area 31 had total vegetation cover greater than the standard, but <br />when cheatgrass was removed from the cover total it no longer met the standard. <br />Table 7: Vegetation Cover Success Standard Comparison <br />Vegetation Cover <br />Reclamation <br />Area 30 <br />Reclamation <br />Area 31 <br />Mean <br />46.8 <br />37.2 <br />Mean (minus noxious) <br />33.8 <br />20.2 <br />St Dev <br />10.6 <br />7.6 <br />N <br />10 <br />10 <br />Nmin <br />19 <br />27 <br />Standard <br />34.7 <br />90% of Standard <br />31.3 <br />Standard Passed? I <br />Yes I <br />Yes <br />Both Reclamation Areas exhibited increased cover from 2012 which was the last year when <br />vegetation cover data was collected. This is likely due to the above average precipitation in the <br />year preceding sampling (September 2013 — July 2014). However, this increased cover resulted <br />from increases in introduced species, because native species absolute cover actually declined <br />(Figure 4). Cheatgrass increased from 2.8% cover in 2012 to 13% in 2014 in Area 30, and a <br />similar trend was observed in Area 31 (5.8% to 8.2 %). Introduced annual forb populations of <br />prickly lettuce (Lactuca seriola), kochia ( Kochia scoparia), and Russian thistle (Salsola tragus) also <br />exploded from 0% to 12.2% in Area 30 and from 0.2% to 3% in Area 31. A pre- emergent <br />herbicide was applied prior to the 2012 growing season which was credited with the decrease in <br />cheatgrass and other annual weeds in 2012. Given the 2014 data it may be advised to complete <br />another application in these areas. <br />Vegetation data have been collected in Reclamation Area 30 since 2009, which allows for some <br />evaluation of trends. In 2009, the area was dominated by cool season perennial grass species <br />which comprised over 72% of the relative cover while warm season species comprised only <br />4.6% (Table 8). However, over the past six years this composition has reversed. Cool season <br />grass species have steadily declined to only I% relative cover in 2014 and warm season grasses <br />have steadily increased, peaking at over 63% relative cover in 2012. Warm season grasses <br />decreased slightly from 2012 to 2014 (by 3.4 percentage points of absolute cover), but the <br />relative cover decrease was drastic due to the increase in cheatgrass cover. <br />Habitat Management, Inc. 13 September 2014 <br />
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