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i <br />4-5 <br />of alluvium in East Salt Creek and these ephemeral trib- <br />. utaries Results of exploratory drilling and monitoring <br />well installation in the valley where the waste pile is <br />proposed give evidence to the similarities. <br />The uppermost part of the east side tributary that is lo- <br />cated within the northern part of Section 32 has a char- <br />acter similar to that of the Munger Canyon Creek and <br />other valleys in the north part of the area. The alluvium <br />becomes very narrow; it is dissected by numerous erosional <br />gullies and it is partly covered by colluvium. <br />4.1.3.3.3 Uplands <br />The uplands are a result of the erosion of steep-sided val- <br />leys in the A9esa Verde Formation or in the Mancos shale. <br />The valley sides are either bedrock outcrops or colluvial <br />soils. In addition to the bedrock, several alluvial fans <br />• have been identified on the site. They cover the alluvial <br />deposits of East Salt Creek and would not qualify as AVF. <br />At one location, on the west side of the East Salt Creek <br />valley, directly below the confluence of McClane Creek, an <br />old and high river terrace was identified. It was found <br />in the road cut for the state highway extending approxima- <br />tely twenty feet above the road. It consists of distinct <br />horizontal layers of well-rounded gravel, interbedded with <br />several layers of silty clay. <br />In addition to these geologic formations, several fills <br />could be identified within the area; one such fill which <br />comprises a large earthfill dam built across the East Salt <br />Creek valley close to the confluence with the McClane Creek <br />is indicated on Figure 4.1-1S. Remaining fills forming sev- <br />eral ranching ponds are of a lesser extent and therefore <br />have not been indicated on the figure. <br />Revised: 6/8/84 <br />