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<br />. <br /> <br />. <br /> <br />done earlier indicated that a better site than that originally filed <br />upon may exist about three miles upstream. A suitable site for a <br />conventional spillway will be important in selecting the most suitable <br />alignment. <br /> <br />Consideration shall be given to trying to locate beds of harder <br />sandstone within the top of the Wasatch Formation or base of the Green <br />River Formation that might serve as suitable foundation for an RCC dam. <br />Attention shall be given to jointing and faulting within the harder <br />units. Based upon this mapping and area-capacity curves, the <br />Contractor, together with the State, shall select one site for the <br />detailed foundation investigation. <br /> <br />Task 5 - Reservoir Area Evaluation - The south, or left, side of the White <br />River in the designated mainstem region has been mapped by the USGS and <br />others as containing several significant landslides. These slides, if they <br />exist, could render infeasible a particular dam abutment or could pose a <br />significant hazard to reservoir slope stability. Most of the existing <br />interpretation has been based upon aerial photography and has not been <br />confirmed by surface mapping or subsurface investigation. The Contractor <br />shall drill in approximately three locations, if necessary, to ascertain the <br />characteristics of areas that indicate landslides. <br /> <br />For each dam site, a detailed and accurate height-area-capacity table shall <br />be produced. The area versus dam height relationship is to be subdivided <br />into the types of lands that would be inundated by a reservoir. Other <br />characteristics of the reservoir shall be tabulated to assist in preparing <br />overall cost estimates and in conducting future feasibility and <br />environmental studies. Items such as miles of stream, residential <br />buildings, roadways, power lines, and telephone lines within various levels <br />of reservoir areas shall be measured and displayed. <br /> <br />Task 6 - Foundation Investigations - After the dam axis has been selected at <br />Powell Park and at the two upstream mainstem sites, the Contractor shall <br />conduct subsurface exploration and testing of the foundation and abutment <br /> <br />A-6 <br />