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<br />The Canadian Strip Mine itself is located in the eastern <br />central portion of the intermontane basin referred to as North <br />Park. The basin reflects the underlying North Park Syncline, a <br />broad, southeast-plunging structure. The tectonic forces which <br />created the North Park Syncline also resulted in formation of <br />local folds and faults which are known to have displacements of <br />10 to 100 feet or more in the permit area. The mine is located <br />on one such fold, the McCallum Anticline, which is doubly-plung- <br />ing, assymetrical, and trends north-northwest. As a reflection <br />of the underlying structural geology, North Park is characterized <br />by gently rolling hills bisected by shallow valleys carrying <br />predominately intermittent streams. <br />The permit area is contained within the Canadian River basin <br />on the west side of the river. More specifically, the permit <br />area is located on the north side of Bolton Draw near the divide <br />between Bolton Draw and Bush Draw; Pit 2 is drained by the North <br />Fork of Bolton Draw while Pit 1 is drained by an unnamed ephem- <br />eral stream which flows into Bolton Draw approximately one-half <br />mile below the permit area (Figure 2 and Plate of the permit <br />applications). <br />The dominant land slope is to the east in the Pit 1 area and <br />to the southeast in the Pit 2 area. Although not given in the <br />permit application, premining slopes have been estimated from <br />maps within the permit application. There is a distinct break in <br />land slope between the northern third and the southern two-thirds <br />of Pit 2. The southern two-thirds drains directly into the North <br />Fork of Bolton Draw with land slopes grading from 20 percent in <br />the northern portion of this area to four percent in the southern <br />portion. The northern third of Pit 2 has a landslope of one per- <br />cent and is drained to the northeast by a small ephemeral stream <br />which joins the North Fork of Balton Draw (Figure 2 Section <br />2.05,and, Figure 2A Addendum II, of the permit application). <br />Based on a USGS topographic map (Plate 4, Appendix C of the per- <br />mit application) natural landslopes within the Pit 1 area were <br />six to eight percent. <br />-20- <br />