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<br />2.1 Soil Borings <br />2.0 Previous Anal <br />Nine soil borings were used in the September 1997 report by Westec. These borings, listed as <br />WBH-O1 through WBH-09, show that the underlying foundation soils aze primarily low <br />plasticity, yellow-brown sandy lean clay and gravel. Boring WBH-04 shows that a layer of well <br />graded gravel with some clay and sand exists below the sandy lean clay and gravel. <br />2.2 Soil Parameters <br />The density of the foundation materials, using the Standazd Penetration Test (SPT), is very high, <br />having blow counts over 50 blows per foot in many azeas. A consolidated-undrained triaxial test <br />. with pore water pressure measurement was completed for a soil sample located at a depth of <br />15 feet in boring WBH-07. This test gave friction angle and cohesion results at the peak deviator <br />stress, 5 percent axial strain, and peak stress ratio. These results aze listed in Table 1. Also <br />listed in Table 1 is the soil moisture content and dry density at the time of testing. <br />Table 1 <br />Triaxial Test Results of Foundation Soil <br /> Friction An le Cohesion Moisture Content D Densi <br />Test Descri lion Test Condition de reel % c <br />k D Undrained 17.2 700 10.4 118.6 <br />eviator Stress <br />Pea Drained 26.5 410 10.4 118.6 <br />5 Percent Axial Undrained 15.2 570 10.4 118.6 <br />Strain Drained 26.0 450 10.4 118.6 <br />P <br />k S <br />R <br />i Undrained 17.0 420 10.4 118.6 <br />ea <br />tress <br />at <br />o Drained 27.1 410 10.4 118.6 <br />The properties for the friction angle, cohesion, and wet density used in the original design are <br />. listed in Table 2. <br />e:uw~zvw3waomPU~v~ta~.ace 2 <br />