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1 <br />' the project site. No further testing of soils in this area will <br />be performed unless determined necessary during site <br />' construction. <br />D.3.3 Material Characteristics <br />D.3.3.1 Geotechnical Characteristics <br />' Based on the project geology as described in Section D.1, <br />the Santa Fe Conglomerate is anticipated to t~e the least <br />competent constituent material of the waste ro~:k. For this <br />' reason, the waste rock disposal facilities have been designed <br />assuming that the Santa Fe Conglomerate materials may be <br />deposited in any area. The presence of the more competent <br />gneiss waste rock materials in any portion of the facilities <br />' will generally improve the geotechnical characteristics. <br />The engineering properties of the reworked ~:onglomerate <br />' waste rock materials have been estimated using classification <br />test results in conjunction with correlations from the <br />' engineering literature. The results of laboratory <br />classification tests on these materials are included in <br />Appendix D. Data ob*.ained from NAVFAC (1982) indicates that <br />loose friction angles between 30 and 40 degrees have been <br />' obtained for similar fill raterials. For analytical purposes, <br />a friction angle of 35 degrees for end-dumped wa<te rock has <br />been assumed. The cohesion intercept has been assumed to be <br />' zero. <br />The foundation materials beneath the waste rock disposal <br />facilities appear to be very similar to those beneath the silty <br />' upper horizon in the heap leach area. As noted in Section D.7, <br />these materials have been estimated to have a cohesion <br />1 intercept of zero and an internal effective stress friction <br />angle of 33 degrees. <br />1 <br />D-16 <br />