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REP40073
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REP40073
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Entry Properties
Last modified
8/25/2016 12:28:32 AM
Creation date
11/27/2007 8:37:54 AM
Metadata
Fields
Template:
DRMS Permit Index
Permit No
C1981019
IBM Index Class Name
Report
Doc Date
3/29/2002
Doc Name
2001 AHR & ARR Exhibit 11 to Exhibit 13
From
Colowyo Coal Company
To
DMG
Annual Report Year
2001
Permit Index Doc Type
Hydrology Report
Media Type
D
Archive
No
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Species Composition <br />• The relative composition of the vegetation of the reclaimed areas sampled is shown in <br />Figure 11. Although not specifically related to any performance standards, the figure <br />does portray the difference between 2-and 4-year old vegetation. The strong <br />dominance of introduced annual/biennial forbs in the three 1999 reclamation areas is <br />readily apparent in the large presence of the dark blue portion of the column. By <br />comparison, perennial grasses and forbs (red, orange, yellow) are the dominant <br />lifeforms in the vegetation of all the 4-year old (1997) areas. Note also the prevalence of <br />introduced perennial species (red and yellow) comprise overtwo-thirds of the vegetation <br />cover. <br />Woody Plant Density <br />The success story of all the areas sampled in 2001 was the Section 16 1997 reclaimed <br />area in which nearly 1200 stems per acre of shrub species were observed. This area <br />makes the existing performance standard of 1000 stems per acre seem achievable. <br />Haw this figure fares as the remainder of the 10-year liability period passes will be of <br />interest. <br />• All other areas sampled were in the range of 160 to 270 shrub stems per acre. These <br />low numbers are entirely consistent with reclaimed areas elsewhere in Northwest <br />Colorado where, after several years the level of shrub density stabilizes at this 100 to <br />300 stems per acre range. It should be also noted that at other Northwest Colorado <br />reclamation sites where native grasses predominate, those native grasses are typically <br />accompanied by higher shrub densities, though still fewer than 1000 stems per acre. <br />Sample Adequacy <br />Although for purposes of monitoring, there is no requirement to achieve adequate <br />sample size, those numbers have been calculated (Table 16) for general information on <br />the homogeneity of the sampled areas. From that table, it can be seen that minimum <br />adequate sample size for cover sampling in each of the six areas sampled was <br />achieved. For the woody plant density sampling, as predictable, the one-stage sampling <br />done for this monitoring effort was far short of statistical adequacy in all six areas. When <br />it is time to conduct sampling for bond release, the use of a two-stage sampling design <br />• can be expected tp facilitate acquisition of an adequate sample. The effort associated <br />
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