Laserfiche WebLink
-3- <br />• <br />ANALYSIS PROFILE <br />The previous configuration of Streeter fill which rose to the 7100 <br />foot level was analyzed by our firm for the Office of Surface Mining in 1979. <br />The results were presented in our report dated August 15, 1979 (Job No. 5368) <br />and included an explanatioh of analysis methods, material properties and <br />ground water conditions.. Because neither the base configuration nor ma- <br />terial properties have changed significantly much of the data has been used <br />in this work. References are presented at the end of this report. <br />Our analysis utilized strength and density properties for each of four <br />types of material; including spoil, colluvium, weathered bedrock, and bed- <br />rock. The spoil was .analyzed assuming no cohesion and angle of internal fric- <br />tion values of 35, 37, and 39 degrees. This range in strength conditions is <br />similar to that used in our original analysis and is sufficient to cover the <br />probable range in properties. The analysis also utilized reduced strength <br />values assuming saturation and weathering. These values include both cohesion <br />and angle of internal friction. We have used cohesion of 200 psf and angle <br />of internal friction values of 10, 15, and 25 degrees. We have assumed the <br />spoil has a total unit weight of 115 pcf. <br />Strength and material properties for the colluvium, weathered bedrock <br />and bedrock are consistent with those used in our previous analysis. For <br />the colluvium, we have used an angle of internal friction of 26 degrees with <br />zero cohesion and a unit weight of 120 pcf. Both the weathered and unweathered <br />bedrock are assumed to have a total unit weight of 135 pcf. The weathered <br />bedrock was analyzed using an angle of internal friction_ of 10 degrees and a <br />• cohesion of 2500 psf. The unweathered bedrock was assumed to have an angle <br />of internal friction of 30 degrees and 5,000 psf cohesion. <br />