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2010-02-25_REPORT - C1981028 (6)
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2010-02-25_REPORT - C1981028 (6)
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Last modified
8/24/2016 4:00:07 PM
Creation date
2/26/2010 8:40:35 AM
Metadata
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Template:
DRMS Permit Index
Permit No
C1981028
IBM Index Class Name
REPORT
Doc Date
2/25/2010
Doc Name
2009 Annual Hydrology and Annual Reclamation Report
From
Coors Energy Company
To
DRMS
Annual Report Year
2009
Permit Index Doc Type
Hydrology Report
Email Name
JHB
Media Type
D
Archive
No
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Coors Energy Company has collected precipitation data at the mine for a number of years. <br />This data represents the most complete record of precipitation from the mine area. Table 5 <br />• presents a summary of precipitation data collected from 1993 through 2009, corresponding <br />with the most recent vegetation monitoring. A review of the data illustrates that precipitation <br />generally is lowest during the late autumn and winter months (October through March), peaks <br />in April through June, and tapers off gradually until late autumn again. The months with the <br />highest average precipitation are May and June. Based on the 1993-2009 data, average yearly <br />precipitation was calculated. <br />Cumulative precipitation for the September-December 2008 period was 2.49 inches, 27.3 <br />percent below the average for those months (3.01 inches). <br />Overall total precipitation for 2009 from January through July was 11.22 inches, reflecting an <br />amount 41.6 percent above average precipitation for that time period. April, June, and July <br />2009 precipitation amounts were significantly above the averages recorded for the mine site, <br />resulting in above average moisture conditions during the 2009 growing season. <br />At the Keenesburg Mine, precipitation relevant to the growing season occurs from September <br />to the following July. Total cumulative precipitation for the period from September 2008- <br />July 2009 was 13.71 inches, the fifth highest value since 1993. Compared to the <br />corresponding averages, this represents a 23.5 percent above the average September-July <br />precipitation amount. <br />is 4.2 VEGETATION COVER <br />4.2.1 2002 Reclamation Areas <br />Table 6 presents a historical record of all vegetation cover and total herbaceous production <br />sampling results for monitoring at the mine since 1994. Though a number of the areas are no <br />longer quantitatively monitored (having been released from liability), this information <br />reflects the impact that varying precipitation regimes and stand age have on the vegetation <br />communities at the mine. The total vegetation cover values of the 2002 reclamation areas <br />reflect an increase of 34.2 percent from the 2007 growing season, when these areas were <br />monitored last. As the September-July precipitation amount from the 2007 growing season <br />was 35.0 percent above average and the corresponding precipitation amount from the 2009 <br />season was 23.5 percent above normal, the increased vegetation cover cannot be attributed <br />solely to an increase in precipitation. <br />Table 7 provides a comparison of the relative cover of species encountered during cover <br />sampling in the 2002 reclamation areas. The following depicts the significant changes in <br />relative cover for selected species in the 2002 reclamation areas (those reclamation areas with <br />a sampling record of three or more years). <br /> <br />Coors Energy Company Keenesburg Mine Page 13 <br />2009 Revegetation Monitoring Report
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