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- 9 - <br /> <br />i <br />n <br />year for exactly the same reasons. <br />This observation is of crucial importance for the proposed <br />construction. It indicates that sliding would be triggered in <br />the future when unsupported cuts are excavated, or fills <br />placed on steep slopes which are frequent in the landslide <br />area. These cuts or fills or other structures might be tem- <br />porarily stable during a dry season such as the fall or winter, <br />but they would become unstable during the spring season when <br />the combination of snow melt and rain apparentlq causes the <br />saturation of certain areas. <br />There is probably only one method available to eliminate <br />potential stability problems within the landslide area: to <br />eliminate the possibility of the saturation within the areas <br />of the proposed construction. The saturation could be averted <br />by careful drainage of zones which are critical for the stab- <br />ility of individual structures. Drainage comprises a powerful <br />tool which can significantly increase the stability. <br />We feel that if ground water conditions are improved at <br />locations of individual structures and facilities, so that <br />ground water levels are lowered to acceptable depths and the <br />potential of their increase is eliminated, the proposed con- <br />struction can be safely realized. As will be discussed later, <br />ground water should be lowered to depths of 10 feet or more. <br />Ia the following parts of this report, more specifics <br />will be discussed for individual structures located within <br />the landslides area. <br />ac.ns.ocauu...n.c <br />