2001-12-11_PERMIT FILE - C1981019 ‎(4)‎

• Permit No: C1981019
• IBM Index Class Name: Permit File
• Doc Date: 12/11/2001
• Section_Exhibit Name: Exhibit 07 Item 06 Hydrologic & Erosional Characteristics of Regraded Surface Coal Mined Land
• Media Type: D
• Archive: No

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CHAPTER IV
STUDY AREA AND EXPERIMENTAL DESIGN
General
Areas of coal deposits are identified by coal regions, and coal
fields within coal regions (Figure 1). Eight coal regions extend into
or are wholly contained in Colorado, and within these coal regions there
are twenty coal fields (Dawson and Murray, 1478). Surface mining for
coal is by no means evenly distributed throughout the areas of coal
deposits; instead the most prevalent surface mining is in the north-
western part of the state, primarily in the Green River Coal Region, with
smaller areas of disturbance in the North Park, Canon City, and Raton
Mesa Coal Regions (U.S. Soil Conservation Service, 1977).
Study Design
Sampling frequency in the coal regions reflected the relative area
of land disturbed, by being somewhat proportional to the number of
surface coal mines active in each coal region. Similarly, the sampling
frequency of the coal fields within the coal regions reflected the. amount
of surface coal mining in each field. Eight sampling sites are in the
Yampa Field of the Green River Region, two sites each are in the North
Park Field of the North Park Region, and the Ganon City Field of the
Canon City Region, and one site each is in the Danforth Hills Field of
the Uinta Region and the Trinidad Field of the Paton Mesa Region.
Generally, six replications of infiltrometer runs with accompanying soil
and spoils core samples and soil and spoils bag samples were performed.
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