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<br />I <br />I <br />I <br />I <br />I <br />I <br />I <br />I <br />I <br />I <br />I <br />I <br />I <br />I <br />I <br />I <br />I <br />I <br />I <br /> <br />3.0 <br /> <br />FIELD INVESTIGATION <br /> <br />3.1 General <br /> <br />A field investigation program was conducted at Gurley <br />Reservoi r to provi de surface and subsurface data and to evaluate <br />the layout and existing condition of the dam and outlet works. The <br />program was completed in several phases during March, April, May <br />and June 19B7. The work included: <br /> <br />1. A surveying program to establish existing conditions, <br />including airphoto and ground survey studies; <br /> <br />2. Site inspections including visual evaluations of the dam, <br />foundation and outlet works; <br /> <br />3. A subsurface exploration program including backhoe test <br />pits, boreholes and standpipe piezometer installation; <br /> <br />4. A surface geophysical program including self potential <br />and resistivity surveys; and <br /> <br />5. A performance monitoring program including measurement of <br />spring flows downstream of the dam and measurement of <br />groundwater levels in the piezometers. <br /> <br />3.2 Surveying Program <br /> <br />Aeri a 1 photographs of the dam and reservoi r were taken on May <br />7, 19B7. Topographic maps of the pertinent areas were then prepared <br />based on the aerial photography. A map of the dam was developed <br />using two-ft contour intervals and is shown on Figure 4. A map of <br />the dam and reservoir was developed using five-ft contour intervals <br />and is shown on Figure 3. <br /> <br />-4- <br />