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<br />/~:~;,~ <br /> <br />,,'_1 <br /> <br />W <br />~:J <br /> <br />w <br /> <br />This Thesis for the Master of Science Degr~e by <br /> <br />Duane Dean Helton <br /> <br />has been approved for the <br /> <br />Department of <br /> <br />Civil and Environmental Engineering <br /> <br />by <br /> <br />I <br /> <br /> <br />c <br /> <br /> <br /> <br />#L <br />, -"~ c::>/k <br />Ernest Flack <br /> <br /> <br />Date De,(.] , /c /'172- <br />, <br />