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• APPENDI% 22-2
<br />To demonstrate the comparability of the affected and extended reference areas, the
<br />following evaluation was completed. The affected lands boundary shown on Exhibit 22-1,
<br />Postmining Vegetation Map was transferred to Exhibit 10-1, Premi ning Vegetation Types. To
<br />determine the maximum extent of the affected area and the extended reference area, both
<br />[he current permit area and the permit expansion area were included. The extended
<br />reference area samples are those which occur between [he affected lands boundary and the
<br />current proposed expansion area permit boundary. Affected area samples occurred within
<br />the affected Lands boundary. Based on their Location relative to the off ec [ed lands
<br />boundary, 1990 vegetation cover samples in the four major types (mixed brush, sagebrush,
<br />aspen, western wh ea tgrass/alkali sagebrush) were segregated as affected area or extended
<br />reference area sampL es. Means and standard deviations were calculated from [he data sets,
<br />and the Students [-test and a similarity index based on Motyka and others' version of
<br />Sorensen's index were used in the determinations. The Students [-test used is as
<br />presented on Page 16 of the October 1988 CMLRD document Guidelines for Compliance with
<br />Land Use and Vegetation Requirements of the Colorado Mined Land Reclamation Board for Coal
<br />• Mining. The Motyka Simi Larity index method was taken from the 1983 USDA-USES Research
<br />Paper INT-322, Measuring Species Diversity on Revegetated Surface Mines: An Evaluation of
<br />Techniques, Jeanne C. Chambers, author.
<br />The following 1990 cover samples (see Tab 10, Appendix 10-9, Tables 1-9) were classified
<br />as affected or reference area data sets by vegetation type:
<br />Mixed Brush Lover Samoles
<br />Affected Area (n=16)
<br />9,6,2,12,3,1,7,11,10 (located in
<br />the current permit area)
<br />Reference Area (n=14)
<br />15,14,13,4,5,8 (located in the current
<br />permit area)
<br />10,14,13,8,3,1,2 (located in the
<br />expansion study area)
<br />Affected Area (n=11)
<br />• 6,10,4 (located in the current
<br />permit area)
<br />11,12,15,6,7,9,4,5 (located in the
<br />expansion study area)
<br />Sagebrush Cover Sam les
<br />Reference Area (n=19)
<br />1,2,12,3,15,11,5,13,7,8,14,9 (located
<br />in the current permit area)
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<br />Revised 06/24/91
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