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<br />.' <br /> <br />. <br /> <br />. . <br /> <br />..~- <br /> <br />i '1 <br /> <br />. -:. >. <br />.___~_~_L__ <br /> <br />.:.", <br /> <br />'-~""'-~~'---"-~_:-'--- <br /> <br />.'CO,,,,,,,,,,, <br /> <br />~ <br /> <br />Layouts and drawings shall be prepared to meet the ewca report standards. New <br />cost estimates shall be prepared' based on a more detailed computation of <br />quantities and unit prices. <br /> <br />The plan developed under this taslc shall become the preferred plan for repair <br />and rehabilitation to be used in the remaining feasibility analysis for each <br />Project. <br /> <br />7.2 Geotechnical Investigation <br />During the time that Taslc 2 is being carried out,. the programs for field <br />exploration and, laboratory testing of embanlanent, foundation, and potential <br />construction materials on each Project shall be refined. Test holes have been <br />drilled at the Comanche and Peterson Lalce sites in the past and this informa- <br />tion shall be utilized to the maximum extent possible in defining the pro- <br />gram. The scope of the geotechnical investigations at each site cannot be <br />fully defined in this scope of services as they are extremely dependent on the <br />results of the Taslc 2 site inspections. A significant amount of judgement <br />shall be required in combining the supplemental drilling and test results with <br />existing data to select preliminary design parameters. <br /> <br />For all three dams, the rehabilitation solutions are centered around the <br />structural stabil ity of the embankments and foundations. On all Projects, <br />seepage flows are contributing significantly to the problems and are of major <br />importance in carrying out stability analyses. Therefore, during the data <br />collection and review, field inspection and exploration, the objective .shall <br />be to fully identify and investigate all deficiencies of the dams and founda- <br />tions, and assess the observed seepage response during the early operations of <br />the 1986 season. <br /> <br />Various methods of either reducing or controlling seepage flows shall be <br />incorporated into alternative designs for each dam. The treatment for seepage <br />control shall be instrumental in the stability analysis. General stability <br />evaluations shall be made for the alternatives and more detailed stability and <br /> <br />-7- <br />