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<br />WOOdward-CIV_ <br /> <br />.' <br /> <br />indicate movement in the downstream slope, The field investigation we propose includes <br />investigation of this possibility. A sixth drill hole (as requested in the summary by Mr. <br />Templeton) could be included at a location determined after drilling the 5 primary drill <br />holes, or to the left of the outlet works; however, at this time we recommend a basic <br />program of 5 drill holes with a contingency for a sixth hole, <br /> <br />Piezometers will be installed in each of the drill holes. Drill holes from the crest and <br />downstream toe will be completed with open well (stand pipe piezometers), and the two <br />upstream piezometers will be completed with isolated tip piezometers installed in the <br />foundation soils. <br /> <br />We recommend that the piezometers be installed using combined piezometer/ <br />inclinometer casing. This option is discussed in Section 5 as Scope Option 1. <br /> <br />Task 2 - Surveying <br /> <br />Surveying will be performed to locate test holes and movement monuments. In addition, <br />we recommend limited surveying of the embankment geometry. The embankment <br />surveying will include one profile along the crest, one profile across the upstream slope <br />at mid height, 3 cross-sections of the embankment, and definition of locations of the <br />surface cracks. Survey data will be important in defining the geometry of the potential <br />slide area, providing cross-section data for stability analyses, and providing a basis for <br />quantity estimates for the repair measures. <br /> <br />Task 3 - Laboratory Testing <br /> <br />Testing will be completed in our in-house laboratory. Field samples will be reviewed by <br />our field geotechnical engineer/geologist and our geotechnical engineer performing the <br />analyses. Selected samples will be tested for engineering properties including moisture <br />content, dry density, specific gravity, gradation, Atterberg limits, and triaxial shear <br />strength. We anticipate that 2 to 3 triaxial shear envelopes will be performed - <br />consisting of envelopes on the foundation and embankment materials, If samples of the <br />slide plane are encountered and the plane consists of a thin layer of clay or claystone, <br /> <br />Woodward-Clyde Consultants <br /> <br />23360/PRO.4 12-08-93(8:53am)/RPT <br /> <br />4-2 <br />