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REV07907
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REV07907
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Entry Properties
Last modified
8/25/2016 1:08:38 AM
Creation date
11/21/2007 9:48:08 AM
Metadata
Fields
Template:
DRMS Permit Index
Permit No
C1987072
IBM Index Class Name
Revision
Doc Date
2/12/2004
Doc Name
Bond Release Application
From
Savage & Savage
To
DMG
Type & Sequence
SL2
Media Type
D
Archive
No
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Minerals and Geology in their 1988 Guidelines for Compliance with Land Use and <br />Vegetation Requirements of the Colorado Mined Land Reclamation Board for Coal <br />Minine. Analysis of quantitative relative cover data derived from quantitative total cover <br />information provided the basis for assessment of species composition. <br />III. Results and Discussion <br />Reclaimed Area Description <br />The 10-acre permit azea's vegetation consists mainly of three types: Mountain Shrub, <br />cropland, and Pirlon-Juniper. These vegetation types occur within the mine area at <br />elevations ranging from 7,360 feet to 7,680 feet. The reclaimed area north of La Plata <br />County Road 120 is primazily located in the Pinon-Juniper vegetation type, which has a <br />reduced understory of herbaceous vegetation, and lower general species diversity. The <br />average annual precipitation in this area is approximately 20 inches. However, during the <br />2001-2002 growing season there has been a statewide drought in effect. This drastic <br />reduction in precipitation has limited the growth potential of many areas of the state, <br />including all reclaimed azeas. Therefore, declines in production, species diversity, woody <br />plant stem density, and cover are to be expected. Additionally, the type and amount of <br />vegetation varies with differences in slope, exposure, and soil depth. <br />Statistical Comparison of Reclaimed and Reference Areas <br />The collection of statistically adequate data for the pazameter of vegetation cover allows <br />the statistical evaluation for compliance with the revegetation success criteria of the <br />mining and reclamation permit. The revegetation success criterion for cover was <br />established by CDMG in the permit approval findings document. The revised cover <br />standazd is 30 percent. The document does not specify the components of the cover <br />standard, whether total ground cover or total vegetation cover is intended as the standazd. <br />Cover <br />Ten individual species representing three lifeforms were encountered during the sampling <br />of the reclaimed azea. They included graminoids and shrubs. The plant species observed <br />and their characteristics are presented in Table 1. Total mean vegetation cover of the <br />reclaimed area was 30.26 percent. Based on cover sampling, graminoids represented <br />11.86 percent mean cover (39.19 percent relative cover), forbs accounted for 0 percent <br />mean cover (0 percent relative cover), and shrubs 18.40 percent mean cover (60.81 <br />percent relative cover). <br />The dominant plant species was Chrysothamnus nauseosus (Rubber rabbitbrush) at 17.47 <br />percent mean cover (57.73 percent relative cover). Two additional species provided <br />significant additional cover (greater than three percent relative cover). Those species <br />were: Agropyron cristatum (Crested wheatgrass) with 5.33 percent mean cover (17.61 <br />percent relative cover) and Oryzopsis hymenoides (Indian ricegrass) with 5.6 percent <br />mean cover (18.51 percent relative cover). Vegetative litter (prior year's growth, dead <br />6 <br />
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