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- 12 - <br />soils of the terrace deposits comprise the best available <br />material for construction purposes (road subbase, compacted <br />fills, etc.). Additional testing would be required to verify <br />the quality of these materials. <br />colluvial_soils are a geotechnical unit which occurs mostly <br />--------- ----- <br />in the upper part of the road alignment. As discussed earlier, <br />we believe that these colluvial soils are originally landslide <br />deposits. They have a considerable thickness as can be seen in <br />several road cuts excavated in this material. At several loca- <br />tions, such as in the portal cut and in the cut No. 4, the <br />thickness of the colluvial soils is apparently limited as rock <br />• outcrops can be seen close to the toe of the cut. Further excava- <br />tions at these locations will very probably encounter rock at a <br />shallow depth. <br />colluvial soils are usually sandy and silty clays often <br />containing angular cobbles and boulders of sandstone or siltstone. <br />At the portal cut, they contain numerous fragments of burnt shale. <br />Two samples of the colluvial soils (samples No. 1 and 2) were tested. <br />Talus-deposits occur on steep valley slopes, mostly below <br />conspicuous sandstone cliffs. They occur mostly in the lower valley <br />part along the Munger Creek, but they are also frequent in the lower <br />part of the Munger Creek tributary valley. Typically, sandstone <br />• cliffs intercept talus slopes. The thickness of these deposits is <br /> probably limited, increasing toward the bottom of the valley. <br />