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<br />. <br /> <br />. <br /> <br />and jointing that might have an effect on the physical feasibility of the <br />sites. A survey will be made of the jointing revealed in rock outcrops of <br />the units that might affect stability or permeability of the foundation. <br /> <br />Specific requirements for each dam site are as follows: <br /> <br />Lake Avery - The surface geologic mapping at the Lake Avery site shall <br />focus on delineating the limits and nature of the alluvial overburden on <br />the left abutment and on describing the alluvium-bedrock contact. <br />Special attention shall be given to an apparent gravel-filled channel <br />southwest of the present dam. This channel, if verified, could have an <br />effect on the maximum height to which the dam could be raised. A source <br />of impermeable blanket and core material shall be sought because <br />previous investigations have indicated this as a critical need in <br />designing a larger dam. <br /> <br />Mainstem Sites - The surface geology of the entire study area along the <br />mainstem of the White River shall be mapped using the new topography. <br />Attention shall be given to accurately mapping the various lithologic <br />units that the river cuts through in this stretch. The mapping shall <br />record the strike and dip and principal joint patterns in these units. <br />Any significant faulting or folding of these units is to be shown on the <br />map. Special attention is to be given to investigating the possible <br />occurrence of landslides along the south side of the river. <br /> <br />Based upon the results of the geologic mapping, previous hydrologic <br />studies, and reservoir storage characteristics, the Contractor, in <br />cooperation with the State shall select the most feasible sites for <br />detailed site investigation. <br /> <br />Powell Park - Although the surficial geology of the reach of the White <br />River in which the Powell Park dam and reservoir is located has been <br />previously mapped in some detail, The Contractor shall upgrade this <br />work. The Powell Park site abutments are to be critically examined to <br />determine the best alignment for a dam axis. The reconnaissance study <br /> <br />A-5 <br />