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<br />`3 December 1986 7 <br />863-2052 <br />3.0 LABORATORY TESTING <br />As previously described, excess spoil stability analyses were <br />performed using assumed material properties based on previous <br />sampling and laboratory testing within and adjacent to the Little <br />Middle Creek tract. Parameters assumed in the stability analyses <br />include the following. <br />Material Type <br />Spoil, loose <br />Spoil, compacted <br />Bedrock/spoil contact <br />Intact bedrock <br />Friction <br />Unit Weight Cohesion ~ Angle <br />(pcf) (psf) (degrees) <br />110 0 37 <br />120 300 33 <br />140 0 25 <br />145 10,000 35 <br />Soil, rock, and spoil material samples collected during ;this <br />field investigation were carefully examined to determine whether <br />these materials exhibit physical properties (unit weight, co- <br />hesion, and friction angle) comparable to those previously <br />assumed. Although the rock encountered varies considerably in <br />terms of gradation, weathering, and cementation, no soft (low <br />shear strength) units were detected. Because of this, no addi- <br />tional strength testing was performed in connection with this <br />investigation. <br />Laboratory testing of samples collected during October 1986 was <br />limited to classification testing of two mine spoil samples <br />obtained from B-4. Gradation testing (ASTM D-422) of samples <br />collected from depths of 6.5 and 17.0 feet confirms that the <br />spoil is characterized as a well-graded gravel with little to <br />Golder Associates <br />