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<br />TABLE 1. PIIYSICAI. PROPERTIES OP OVERBURDEN ROC}:S <br />Rock Unit Property Mean Standard Deviation <br />Silly, Sandy Clay Angle of Internal Friction 29.07° 1.31° <br />CL Cohesion 413 PSF 263 PSF <br /> Density (as tested) 124.0 PCF 2.3 PCF <br /> Moisture (as tested) 18.3X 0.7X <br />' Saturation (as tested) 75.9X 4.87. <br />Claystone, sli.flitly Angle of Internal Friction 19.23° 2.08° <br />sandy Cohesion 1331 PSF 356 PSF <br />CH Density (as tested) ~ 134.2 PCF 1.9 PCF <br /> Moisture (as tested) 18.47. 0.7% <br /> Saturation (as tested) 89.8X 4.6% <br />Siltstone, very sandy, Angle of Internal Friction 31.86° 8.05° <br />slightly clayey Cohesion 1444 PSF 1545 PSF <br />1fL ~ Density (as tested) 132.4 PCF 1.2 PCF <br />. Moisture (as tested) 22.SX 0.8% <br />' Saturation (as tested) 97.SX 3.2% <br />~ale.(lower clay Angle of Internal Friction 11.43° 2.53° <br />z Claystone) Cohesion 2000 PSF 370 PSF <br />slightly sandy, Dcnsi[y (as tested) 129.7 PCF 0.8 PCF <br />contains numerous Moisture (as tested) 22.6X 0.47. <br />slacken sides Saturation (as tested) 91.SX 1.2% <br />CH <br />~_21- <br />