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<br />. <br /> <br />. <br /> <br />6 <br /> <br />3.0 PUASE I SCOPE OF WORK <br /> <br />The following subsections describe the proposed Phase I scope of <br />work. <br /> <br />3.1 Field Investigations <br /> <br />3.1.1 Borehole Investigations <br /> <br />A borehole investigation program will be performed to determine <br />dam construction materials; if the dam has an internal seepage <br />cutoff wall; the hydraulic pressures within the dam; in-situ <br />hydraulic ~onductivity of the dam and bedrock materials; and <br />potential borrow sources. We have assumed that access to the dam <br />and borrow areas will be provided by the Town of Victor. <br /> <br />During all drilling, boreholes will be advanced with a 4-inch <br />. diameter tricone bit using water to flush away cuttings. Casing <br />will be advanced just behind the rotary bit to preyent caving of <br />the borehole, <br /> <br />Angle Borings--The program will initially consist of drilling at <br />least three shallow angle holes along the west (downstream) side <br />of the crest in an attempt to locate some type of internal cutoff <br />wall within the dam (Figure 2). If a cutoff wall is found, two <br />additional holes will be drilled between the initial three holes <br />in a similar matter to help locate its exact location, <br /> <br />Vertical Embankment Borings--Next, two vertical holes will be <br />drilled into the embankment from the crest (Figure 2), Assuming <br />that coarse-grained materials are encountered, California drive <br />tube samples will be obtained (and blows/foot recorded) every <br />5 feet in depth, If cohesive soils are encountered in the <br />