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-1???-?I?PR-? <br />??? l?ngineering Adequacy Review <br />?? J'uly X009 <br />Page 3 of 4 <br />'lease adjust the si?? from ?Q inches ?? ?? inches far ??? ?cnd?rdrain Material <br />req?ciren?ent. <br />Response: ?'igurc ?? and Appendix A of the report have been revised to reflect the <br />?? inch minimum rock size. <br />Items reso??e? -? ?a ?u„rt?er a??i'o?t is rear <br />AA,? horse ud? ?'i?? Stu?i?i?a?ysls <br />section .o -1VIode1 Results <br />For Model 3, AAI uses a highly weathered, slal'?able material, with fair compaction <br />?carrespanding approximately to the last entry in Tables ? and 7}, in the analysis. The <br />estimated composition of the horse gulch Fill will be 40°I? shale and ?a?1o sandstone <br />Table G}, with high ?rariability and segregation present throughout the Fill. Where maybe <br />no accurate way to model f ar such variable composition, and AAI's stated approach is, <br />"nat to model for the worst case but rather the worst reasonably expected case" ?AAI, <br />Page ??, ?? the variaus rrlaterials included in Tables 5 and 7, it appears to the Division <br />that "?haley material fair compaction" may exist in the H? dill in rather large proportion. <br />The estimated cohesion for this material is a mere ?1?0 psf, and the lops- analysis <br />predicted a failure surface occurring in this layer rather than within the clay beneath. <br />Please provide a discussion evl?atin? tiZe sensitivity ?i?'any? of ?? ?ro?ose? Norse <br />tech Fi?? to the possibility of as n??cch as ??? of the vc?r??ne of the f ??? b?i?g comprised <br />of `this un-weathered sh??e ?atrta? wi?h?air' compaction. <br />Response: section 3,o has l?cen revised to include ? model hand discussion of the <br />modeY? of the Horse gulch Fiilcomprised of un-weathered shale material with fair <br />compaction, <br />Item re?o?ved - ?? further ?ct??n is re?uirerif <br />section 4,p - Underdrain ?csign and construction <br />4.? Drain Design ?- A bulldozer will cut a trench along the proposed alignment for the <br />underdrain, According to the second paragraph on Page ??, dragline spoil will be <br />allowed to drape over the core to faun the Ater system. The drain design details in <br />Appendix A would seem to indicate that the coxe will be constructed of very coarse <br />boulders ahead a? the advancement of the dragline fill, but the text daes not specifically <br />state that to be true, <br />Please provide additional d?tai? in the test to describe the ?nethcd of ?nderdrain core <br />construction in advance o the dra?line operation,