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REP26054
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REP26054
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Entry Properties
Last modified
8/24/2016 11:57:25 PM
Creation date
11/27/2007 4:24:13 AM
Metadata
Fields
Template:
DRMS Permit Index
Permit No
C1981028
IBM Index Class Name
Report
Doc Date
2/28/2002
Doc Name
2001 AHR & ARR Letter to Page 65
From
Coors Energy Company
To
DMG
Annual Report Year
2001
Permit Index Doc Type
Hydrology Report
Media Type
D
Archive
No
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The number of samples within each parcel varied from 2000 due to management measures <br />undertaken eazly in this yeazs growing season. Recognizing the need to manage Bromus <br />• tectorum {cheatgrass) in the reclamation areas, small controlled burns were conducted <br />within portions of the 1995 reclamation area and within areas not yet topsoiled or <br />revegetated. <br />Sample sites were located in the field through compass triangulation and pacing from <br />known landmazks. Figures 1 and 2 illustrate the location of the reference and reclaimed <br />areas and sample point locations for each azea sampled. <br />In the areas reclaimed in 1985, 1986, 1987, 1999, and 2000 a qualitative evaluation of <br />revegetation success was undertaken this year. The 1985, 1986, and 1987 areas were <br />previously monitored (1994-1998) and after successfully meeting revegetation success <br />criteria, were released from the Phase II liability requirements by the Colorado Division of <br />Minerals and Geology August 11, 1998. This yeaz, qualitative evaluation of these areas <br />included estimating vegetative cover, herbaceous production, and identifying the dominant <br />plant species. Any locations or trends in vegetation development that required attention <br />were also noted. The areas revegetated in 1999 (A Pit and south of the Topsand Piles) <br />and 2000 (former haul roads NE and E of B Pit and S and E of the 1986 E azea) were <br />qualitatively evaluated this yeaz. <br />The Osgood sand reference area was measured and mapped in the field in 1994 by Savage <br />and Savage staff, and this scaled drawing of the reference azea was used. On the scaled <br />drawing, a Cartesian coordinate grid (50x50 feet) was established. Computer generated <br />• random numbers were used to establish a pool of x,y coordinates. Ten vegetation cover <br />and fifteen herbaceous production sample locations were randomly established for the <br />reference area. Sample sites were located in the field through compass triangulation and <br />pacing from known landmarks. <br />FIELD SAMPLING <br />Timing <br />Field investigation was undertaken during the period August 20 through August 23, 2001. <br />This time period coincided with anthesis and maximum development of the majority of <br />plant species found in both the native vegetation community (Osgood sand reference area) <br />and the reclaimed areas at the mine site to be evaluated. The Keenesburg azea <br />experienced a very dry period during the winter and eazly spring of 2001 based on mine <br />site records. Late spring precipitation was heavy, followed by moderate precipitation <br />through the summer. <br />Vegetation Cover <br />Vegetation cover was estimated by the use of the point-intercept method. An ocular point <br />frame (ESCO Associates) was used to minimize instrument error and maximize precision <br />and observer accuracy. Cover transects were 25 meters in length, with two sample data <br />• points collected at 1.0 meter intervals along the transect on opposite sides of the transect <br />_~ <br />
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