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- 2 - <br />horizontal. The effective slope was later dianged to 20° from the <br />• horizontal to obtain adequate safety factors. <br />SIT£ Q7tdDITI0t1S. The waste disposal site is located in the <br />Northwest quarter of Township 8 south, Range 89 west, adjacent to North <br />ltionQ.,on Creek. The disposal area is located in the natural valley <br />bordered by hills approximately 500 feet above the bottom of the <br />valley. A gravel road leads from Carbondale into the mine and a haul <br />road is being used by duup trucks to carry refuse material from the <br />mine to the refuse site. Overlooking the center of the pile, this <br />gravel road is approximately 300 feet above the bottaa of the valley. <br />The area slopes in the southeast direction. The maximum <br />difference in surface elevation of the existing refuse pile is m the <br />order of 30 feet. The toe of this refuse pile leads into the retention <br />pond at an approximate elevation of 7450 feet. The runoff in the <br />valley drains into an open ditdi rortheast of the refuse pile and <br />collects in the retention pond. Floristically, the valley associated <br />with the disposal area is a typical transition zone 2 diaracterized by <br />sparsely vegetated hillside. <br />G~OLDGIC SE1TIIiG. The site is situated along the eastern edge of <br />the Grand Hogback Monocline, which defines the eastern boundary of the <br />Colorado Plateau Physiographic Province. Bedroc9c in the immediate <br />site vicinity is the Flanoos Shale of Cretaceous age. The upper Iles <br />and lower Williams Fork Bbrmations of the liesa Verde group, also of <br />Cretaceous age, are exposed in the cliffs to the rorth and west of <br />• <br />