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' - 14 - <br />' 3.2 WASTE ROCK PILE LOADING EFFECT <br /> The placement of the future waste rock pile on the sur- <br /> face of the upper bench will inevitably influence the present <br /> stability conditions. If the waste pile is constructed so that <br /> its toe extends all the way north to the crest of the upper <br />' bench, the loading effect of the pile could trigger further <br /> sliding as it would lower the existing factor of safety of the <br /> slope. <br />' The evaluation of this loading effect is an item of <br /> primary importance; the loading effects of this pile have been <br /> investigated by a series of stability aralyses. <br />' <br /> 3.3 TUNNELING BELOW FUTURE WASTE ROCK PILE <br /> Th <br />h <br />i <br />f <br />d fi <br />i <br /> e construct <br />e propose <br />ve m <br />on o <br />ne entries will <br />t <br /> comprise an important interference into the slope. As was dis- <br />' cussed in previous reports by GEO-HYDRO Consulting, Inc., the <br /> first portions of the proposed entries, adjoining the portals, <br />' will be driven in landslide deposits. It will be of crucial <br /> importance that the deformations of the old landslides are not <br /> renewed. It will be of the same importance to drive the deeper <br /> portions of the tunnels, when they reach the intact bedrock, <br />' with the same caution so that no new landslides are triggered. <br /> Any larger landslide during the construction would result in <br /> considerable difficulties and increased costs of tunneling. In <br /> addition, the use of the upper bench for other purposes could <br /> be endangered as well, since the slope deformations could <br />h <br />b <br />h <br />il <br />h <br />f <br />f <br />d <br /> enc <br />. <br />eas <br />y exten <br />to t <br />e sur <br />ace o <br />t <br />e upper <br />1 <br />1 <br />' <br /> ceo++rono consu~mw, iNC. <br />