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-5 - <br />existing ground surface at the time of our field explora- <br />tions. <br />STABILITY ANALYSES <br />IDEALIZED EMBANKMENT SECTION <br />Since the portion of the embankment in which <br />stability was questioned lies between stations 2+00 and <br />4+50, we selected the section at 4+50 for our stability <br />analyses. The portion of the embankment underlain by <br />the silt stratum is highest at this location. Embank - <br />went geometry selected for stability analyses is the <br />same as shown on Plate C-1426, dated May 30, 1974, and <br />prepared by Davis Engineering Services, Inc. <br />The soil and rock strata beneath the embank- <br />ment were idealized from the information obtained from <br />our borings and test pits. The brown silt, which was <br />considered to be the problem soil, was modeled as an 8 - <br />foot -thick layer under the entire embankment. This is <br />a conservative estimate, since it was only found at <br />three of nine locations explored. Another soil layer, <br />consiting predominantly of silty and clayey sands, was <br />modeled beneath the silt. Weathered bedrock was assumed <br />IIA MFS 1! M,1llOF <br />