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- 16 - <br />• <br />• <br />\J <br />and not compacted. Considerable settlements of this fill seem <br />to confirm this information. <br />The fill at the crushing and screening level has the <br />largest yardage and height of all the fills. Several profiles <br />across this fill have been constructed to obtain data on the <br />fill dimensions and the foundation topography. The evaluation <br />shows that the crushing and screening level fill has been <br />constructed on a fairly steep slope (the slope becomes flat- <br />ter below the toe of the fill). The maximum height of the <br />fill is more than 100 feet. The face of the fill has a slope <br />of 1.5 (H) 1 (V). <br />Several studies were performed by consultants to <br />Colorado Westmoreland, Inc. in the past. They dealt mostly <br />with the foundations of the structures that were built on the <br />crushing and screening level. Two of these studies, namely <br />the study by Ken Pfedearis Associates and by The Willis fi Paul <br />Corporation mention specifically potential stability problems <br />of this fill. <br />We concur with this evaluation; the fill is very high, <br />its slope is steep and the method of construction apparently <br />has not been performed as necessary for such fill. We feel <br />that the stability of this fill should be reevaluated as soon <br />as possible. The stability of the fill is important also <br />because of the proposed waste disposal pile that is to be <br />located directly below this fill. <br />It is also desirable to investigate the configurations <br />of additional fills on the site using data on the pre-mining <br />topography and to evaluate the types of materials used in <br />these fills. This evaluation will enable an assessment of <br />potentially unstable conditions of other fills as well. <br />c[oHroao cawansc. ANC. <br />