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3.0 CONCLUSIONS AND RECOMMENDATIONS <br />. 3.1 Conclusions <br />1. Proposed Sedimentation Pond 005 is located in a geologically favorable <br />setting. <br />2. Most of the haul road alignment is in a stable geological environment. <br />That reach of the proposed haul road between Sta. 51+50 and St. 63+9C <br />encounters the least favorable geology within the total alignment; <br />however, major changes in the alignment could only be made by moving it to <br />the west, thus impinging on the natural drainage, creating a much steeper <br />cut slope, and moving into the snow shadow. <br />3. The potential for rockfall exists in that reach of the haul road alignment <br />between Sta. 26+00 and Sta. 35+00; however, this potential is concluded to <br />be low. <br />4. The lower part of the Williams Fork Formation includes shales that, upon <br />weathering, cause unstable ground and in extreme conditions, landslides. <br />The greater the proportion of shale to sandstone, the greater the <br />potential for unstable ground to develop. All of the unstable ground <br />mapped in the area has developed in the Williams Fork Formation. <br />5. Three categories of ground stability were established for this project, a) <br />Stabilized Ground (Qsq) in which movement has occurred in the past, but <br />which has apparently reached an equilibrium, b) Unstable Ground (Qug) in <br />which movement has occurred in the past, and probably continues today, and <br />c) Potentially Unstable Ground (Qpug) in which future movement is more <br />likely than in more stable areas. <br />6. Faults and other structural features do not appear to have adversely <br />affected 005 Gulch with respect to the proposed developments. <br />7. A positive causal relationship probably exists between ground stability <br />and precipitation based on knowledge of similar conditions elsewhere. <br />5 <br />