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<br />"'t' <br /> <br />,/ <br /> <br />r;~ <br />I. ": J <br /> <br />,-' -- <br /> <br />and incorporated into the stability computations during the process of <br />refining the preliminary design on the selected alternative for this project, <br />The same type of computational process shall be used in less detailed scope to <br />provide guidelines and evaluation data for the initial alternatives <br />presented, The geotechnical analysis shall also consider the future needs for <br />instrumentation or measuring devices to monitor performance after <br />rehabilitation, <br /> <br />Roller Compacted Concrete (RCC) may be a viable tool for providing adequate <br />erosion protection to the primary, secondary and emergency spillways, and to <br />meet design flood requirements, Therefore, 11KE shall make a field <br />reconnaissance of potential construction materials during the Task 2 site <br />visit and select one or more sources for sampling of potential RCC aggregate, <br />The samples shall be subjected to a battery of laboratory tests, as specified <br />in Section 7,2,2 of this Document, to detennine their physical <br />characteristics. In addition, at least one trial RCC mix shall be made and <br />cylinders cast for detennination of compressive strength and freeze-thaw <br />durabil i ty. <br /> <br />The following is a description of the .geotechnical exploration program <br />proposed for Barnes Meadow Dam. <br /> <br />7.2.1 General Scope of Geotechnical Investigation <br /> <br />Over the years, a total of 6 boreholes have been drilled through the dam and <br />downstream of the dam, While these holes have described the material <br />encountered in the embankment and foundation, only general descriptions of the <br />material encountered are available for review, No specific soil strength <br />parameters are available for use in the stability or seepage analysis, In <br />addition, no in-place penneability tests of the dam and foundation have been <br />perfonned. The deepest of the holes drilled previously penetrated only 42 <br />feet into the foundation material downstream of the dam and it cannot be' <br />definitely detennined whether the boreholes encountered a large boulder or <br />definitely penetrated bedrock. <br /> <br />- 8 - <br />