OCR Text |
Show More field investigation and planning refinement would be carried out as proposed construction dates approach. Economic constraints have deferred the gathering of specific data. In the absence of both detailed environmental assessment studies and specific design and alinement data, this discussion is confined to the types of environmental problems to be faced and the general impacts to be expected. ( a) There would be problems in disposing of materials derived from the 7.6 miles of tunnel and the displaced materials from 2.4 miles of buried pipeline and the nearly 1 mile of penstock. Some of this material would be used in the construction of Syar Dam and Dike. ( b) There would be environmental problems associated with the removal of pervious, impervious and riprap materials for construction of dam embankments. Materials exploration has not been completed„ ( c) There would be problems in the construction of the required 7.26 miles of new road and the 0.71 miles of road relocation. ( d) There would be problems in constructing about 10 miles of transmission lines. Some of the potential difficulties that could occur are described in a U. S. Forest Service Report entitled Diamond Fork Hydrologic Analysis Central Utah Project.' 0 Some excerpts from this study are presented in the following paragraphs to illustrate potential problems. Forest Service Report on Diamond Fork Power System " Project Construction " 1. Paved Road: " a. Highway 50- 6 to Palmyra Campground ( Section 1) " Construction potential is good. The land mass is stable. Preferable road location is on the bench area above the proposed reservoir since this will lessen the erosion adjacent to the reservoir. Road drainage should be well engineered to minimize erosion. " b. Palmyra to Narrows ( Section 2) " Special precautions should be taken to ensure that sediment does not enter the stream channel during construction or post construction. Since the road is adjacent to live water along most of 252 |