Laserfiche WebLink
4-4d <br />• a well-definable, wide strip of sediments that can be clearly <br />distinguished from other geomorphic units. <br />The channel of the creek is usually eroded into these deposits; <br />the creek usually flows at the elevation between 10 to 20 feet <br />below the surface of the river terrace. Because of this deep <br />erosion, the active flood plain is absent in most cases. It is <br />developed only locally and in a very limited width. <br />The remaining part of the alluvium was formed by a distinct <br />terrace that comprises a former flood plain which, apparently, <br />is no longer being constructed by the river. <br />There are no accurate data available on the thickness of the <br />alluvial deposits of the East Salt Creek. According to the <br />results of ground water monitoring well installation, the thick- <br />Hess is more than 80 feet. Exploratory drilling performed north <br />of the site for other purposes determined the thickness of the <br />deposits to be more than 100 feet. <br />OTHER ALLWIAL SEDIMENTS <br />As indicated on Figure 4.1-2, there are four identifiable side <br />valleys within the area. On the east side of .East Salt Creek, <br />they are represented by McClane Canyon in the north part and by <br />Munger Creek Canyon on the south side. Located on the west side <br />of the valley floor, there are two unnamed valleys of a very <br />similar character. <br /> <br />