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<br />2 <br /> <br />open pit and underground mine dewatering and slope stability studies; and an evaluation of the <br />stability of underground mine openings in soft rock. For evaluating the feasibility of in situ leaching <br />of copper ore, he directed the assembly and use of special borehole testing equipment. He has <br />supervised and participated in dewatering studies for several proposed mine shafts, two of which <br />extended to depths of approximately 3.000 feet. His responsibilities on these shaft dewatering <br />studies included an analysis of expected ground water inflows and an evaluation of potential inflow <br />control measures stich as grouting and freezing. <br /> <br />Several other projects directed by Mr. Davidson were concerned with the design of linings <br />and containment systems for heap leaching operations. <br /> <br />Mr. Davidson served as chief engineer for a company providing Menard pressuremeter testing <br />and consultation services. During this period, he also served as chief engineer for a company <br />specializing in the application of artificial freezing for construction excavations and shafts. One <br />major project involved stabilization and waterproofing of a construction excavation approximately <br />100 feet wide by 150 feet long by 50 feet deep. using artificial ground freezing techniques. He <br />directed a preliminary research program concerning the application of cryogenics to construction <br />freezing. <br /> <br />":, <br /> <br />He received a Bachelor of Science degree in civil engineering from Iowa State University and <br />obtained a Master of Science degree in soils engineering. His thesis research was on the subject of <br />soil stabilization using lime. He is a member of the American Society of Civil Engineers and the <br />National Society of Professional Engineers. He is a licensed professional engineer in the states of <br />Colorado. Wyoming. and South Dakota. <br /> <br />. <br /> <br />. <br /> <br />. <br />