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- ~ - <br />• Verde Group, As a result of these aquifers, landslides developed <br />on the south valley side where the permeable strata were inter- <br />sected by the topographic surface. Seeps and springs probably <br />did exist on this side because of the overall dip of the formation <br />toward north and northeast. On the other hand, seeps and springs <br />did not exist on the north side of the valley where the strata <br />dip into the mountain. We believe that these hydrological conditions <br />significantly influenced morphological development of the valley. <br />2.4 STABILITY <br />The overall stability conditions of the area are important <br />for the design and the construction. If, for instance, large <br />i landslides could be identified in the area, excessively high <br />cuts or fills could trigger new deformations of these old land- <br />slides or they could trigger the development of new landslides. <br />We have inspected the aerial photographs that cover most <br />of the sutdy area. In addition, we have inspected both sides <br />of the valley, not only along the alignment of the haul road, but <br />also higher in the slope and below the road. <br />As it is common in other parts of West Colorado in the <br />Mesa Verde Group, signs of instability have been found. It <br />appears that they are limited to the southern slope of the <br />valley; we have not detected any significant instability features <br />on the northern side. <br /> <br />