Laserfiche WebLink
- 10 - <br />• .this study is also a small slide that developed close to the <br /> sedimentation pond No. 4. <br /> 4.2 DIVERSION DITCH CUT <br /> The diversion ditch cut that has been excavated during <br /> the last years above the fan level is the longest and one of <br /> the highest cuts on the site. It is more than 2,000 feet long <br /> and its height reaches more than 90 feet at several locations. <br /> The slope of the cut varies from 45 to more than 50 degrees. <br /> The cut has been excavated partly in rocks and partly in <br /> soils. The cut portions in rock are generally slightly steeper <br /> than the cut portions in soil. <br /> Both ends of the cut and its west central portion have <br /> been excavated in rock. The rock has a character of inter- <br />. bedded layers of sandstone, siltstone, shales, and thin layers <br /> of coal. There are very few really hard and resistant layers <br /> present within the cut slope. <br /> The soils are apparently of colluvial character. It <br /> cannot be excluded that the length of transport is consider- <br /> able and that the soils were deposited by intermittent <br /> streams. The possibility that the soils are a landslide de- <br /> posit is very remote; this opinion will have to be verified <br /> during the Phase 2 studies. <br /> There are two distinct buried channels visible on the <br /> cut face; a larger one is in the central portion of the cut, <br /> a smaller one is in the west part of the cut. The central <br /> valley channel is very deep and its bottom is not visible in <br /> the cut face; the total height of the cut in this part is <br /> in soils. <br /> The colluvial soils are silt <br />and cla <br />brown soils <br />e <br /> y <br />y <br />y, <br /> r.[aNVOrocawxnMC.mc. <br />