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and consequently no leaching is expected to take place in the underlying <br /> <br />major portion of the dump. <br />Terracing the faces of the rock disposal pile was considered. The idea was <br />rejected, however, because terraces do not occur on natural talus slopes in <br />the oil shale. Terracing the pile would seriously affect its similarity to <br />the nearby natural talus slopes and detract from the natural aesthetics. <br />A waste pond at the toe of the pile was also considered. Since the perm- <br />eability of pile surface will be minimized as outlined above and the dust <br />content is low, no waste pond is deemed to be needed. <br />OXY has conducted a surface water analytical program in the waste pile <br />area since early 1975 and this program will be maintained as long as <br />needed to collect adequate baseline data and information concerning the <br />• effect of OXY operations on the surface hydrology regime. Samples are <br />regularly collected from Roan Creek and from the tributaries to Roan Creek <br />that drain OXY land. Logan Wash and its tributaries flow for short periods <br />during the spring but otherwise flow only during rare heavy thunderstorms. <br />Dry Gulch where the rock disposal pile will be located has not been ob- <br />served to flow since inception of the OXY work in June, 1972. Samples <br />will be collected from the upper part of Logan Wash and/or Dry Gulch <br />when and if it flows. To date the material collected has been baseline <br />data on the quality of water in the drainage basins adjacent to OXY land. <br />Streams that flow as a result of the torrential thunderstorms that are the <br />source of essentially all the water in the Logan 4lash area are normally <br />fully loaded. When maximum flowing occurs the stream's load-carrying <br />power is at a maximum and erosion occurs. But as the flow diminishes the <br />-14- <br />