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Colorado will be on site to observe and/or provide testing for vegetation and soil removal, <br /> underground working remediation, subgrade preparation, fill placement, SLF placement, <br /> underdrain and leak detection system installation, geomembrane installation, and LVSCF and <br /> DCF placement. Technical specifications for Phase 5 VLF are included in Appendix li. The <br /> earthwork and geomembrane test results and locations will be summarized in an as-built report <br /> certified by a professional engineer registered in the state of Colorado, a copy of which will be <br /> forwarded by CC&V to the DRMS for acceptance. <br /> 4.2 Site Layout <br /> The design and layout of Phase 5 VLF were developed to achieve several key objectives. The <br /> first objective was to provide a geotechnically stable layout, such that acceptable slope stability <br /> factors of safety(FOS)can be achieved. The second objective involved developing an effective <br /> remediation program for the underground workings located within the Phase 5 VLF footprint <br /> area. The third objective included providing adequate capacity for ore reserves. <br /> 5.1.2.2 Geotechnical Material Design Parameters <br /> The development of the conceptual stratigraphic model discussed above in Section 5.1.2.1 <br /> provides a framework on which to base the geotechnical analyses. Material design properties <br /> used in the stability analyses are discussed below and summarized on Drawings A700 through <br /> A720. <br /> Crushed tire. For the stability analysis, the crushed ore material was modeled with an angle of <br /> internal friction of 40 degrees with no cohesion, based on testing performed on Cresson ore <br /> material. The results of the testing performed on nominal V/2-inch minus Cresson ore was <br /> reported to the DRMS in a January 9, 1996, letter from CC&V titled, "Cresson Project: Permit <br /> M-1980-244: Procedures and Materials for 1996 Construction. " The results indicate a <br /> curvilinear failure envelope with internal friction angles ranging between 45 degrees(under low <br /> 37 <br />