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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 />6.0 <br />FIELD INVESTIGATIONS <br /> <br />6.1 SUMMARY <br /> <br />The original dam embankment was believed to be in stable condition. There were no known <br />visible signs of excessive seepage or sloughing to warrant an additional stability analysis. To <br />date, no intrusive investigations have been performed specifically for this feasibility report. <br />However, in January 1995, it was determined during an attempt to re-line the low-level outlet, <br />that the existing low-level outlet was damaged beyond repair. As a result, CDWR mandated an <br />emergency action such that no water will be stored behind Vouga Dam this year. Subsequently, <br />in February 1995, Vouga Dam was permitted to be breached and the low-level outlet removed. <br />During the dam breach construction, grab and test pit samples of the soils in the abutments and <br />general embankment area were taken for laboratory testing to assess the engineering <br />characteristics of these soils. Based on the laboratory tests, the embankment material removed <br />was considered adequate for placement in the reconstructed embankment. The gradation and <br />proctor results are included in Appendix E. Recent topography of the dam and spillway area is <br />shown in Figure 6-1. The surveyed topography has been modified to reflect the recent breach. <br /> <br />242161R1.DOC 02-12-97(3,08PM)/RPT <br /> <br />6-1 <br />