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<br />the ground surface (Wright Water Engineers, 1977). <br />4.2 UPLANDS <br />The Stevens Gulch Alluvium is surrounded on all sides <br />by colluvial soils and hillslope debris. These deposits con- <br />tain a large portion of basaltic material, the remainder con- <br />sisting of material from the sandstones and shales of the Mesa- <br />verde Formation. The lands bordering the valley are relatively <br />steep-sloped and are covered by the brushy vegetation typical <br />of the region. <br />Surficial geologic mapping by Junge (1978) indicated <br />the existence of possible landslide deposits on both sides of <br />Stevens Gulch. The identification of individual landslides is <br />outside the scope of this study. The brief inspection of the <br />• Stevens Gulch valley sides indicates that the landslides, if <br />they do exist, are very old and stable at present. <br />4.3 MINE FACILITIES INFLUENCING THE ALLUVIAL VALLEY <br />The CWI well field is located in the lowermost portion <br />of the Stevens Gulch Alluvium. Fills for the roadway and water <br />storage tank have been placed on the alluvium (less than 1 acre <br />total area). In addition to the water storage tank, a pump- <br />house has been erected on the site. Several cased wells are <br />present within the alluvium and in the adjoining hillslope. The <br />pond at the extreme southwest cornea of the alluvium is located <br />on the natural stream course. <br />- 15 - <br />I~ <br />~EONVOao coaw~nn6, ANC. <br />