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<br />M99012GE <br />7/29/99 <br />Page Two <br />The results of our additional slope stability analysis indicated <br />that the two (2) feet thick layer of ventilation shaft spoil <br />material will not significantly influence the calculated <br />theoretical factor of safety for static condition of the pile. The <br />calculated theoretical factor of safety determined by our <br />additional stability analysis was influenced by the layer of <br />ventilation shaft spoil material less than two (2) percent with the <br />resulting calculated theoretical factor of safety greater than 1.5. <br />If you have any questions concerning the geotechnical engineering <br />aspects of your project or if we may be of further assistance <br />please contact us. <br />Respectfully Submitted: <br />LAMBERT AND ASSOCIATES <br />rm~W. Jo ,ston, P.E. <br />/. <br />NWJ/nr <br />Reviewed By• • <br />_" ._-_ <br />-~` a-_' <br />Dennis D. La t;"P.E. <br />,~ <br />cc: Jim Stover <br />lambert anD ~,o,~ociateo <br />COrvSULTIrvG GEO TEG HHICAL ENGINEERS ArvG <br />MATERIAL TESTING <br />