Laserfiche WebLink
LABORATORS~ TESTING PROGRAM: <br />• Samples of typical waste material to be used in the proposed <br />pile were obtained on site by GEX personnel and shipped to ROCKY <br />MOUNTAIN GEOTECHNICAL'S headquarters in Colorado Springs. These <br />materials can best be described as a black carbonaceous gravel and <br />cobble material, with a considerable amount of sand and silt sized <br />particles. The material contained a significant ar:ount of coal frag- <br />ments, particularly in the smaller sizes. <br />The initial laboratory testing performed included specific <br />gravity, gradation, and Atterberg limits. The results of these <br />tests are shown on the enclosed Soil Summary Sheet. In general, the <br />sample contained roughly 26~ cobble sized particles, 44% gravel sized <br />particles, 22o sand sized particles, and 8~ silt sized particles. <br />The actual material to be placed would, of course, be expected to have <br />more larger sized particles, up to perhaps 12-inches in diameter. <br />The in-place densities of the Roadside Mine reject pile, as <br />determined by others in an earlier report, were examined in order to <br />determine typical in-place density for the waste material. The in- <br />place densities which were examined were obtained from Shelby tubes <br />and California split spoon samples, Thirty values were obtained which <br />range from about 63 pcf to about 100 pcf. The average was approxi- <br />mately 83 pcf. Based upon this information, a dry density of approxi- <br />mately 80 pcf was selected for preparing the triaxial testing samples. <br />The actual dry density at which the triaxial sample was remolded turned <br />out to be somewhat lower than this value. <br />In addition to the testing previously described, a triaxial test <br />• series was performed on the waste materials representative of the fill. <br />The test method used was consolidated, undrained (cu} test, with pore <br />