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AWtiv 28, 21109 <br />C C. <br />'elf <br />600 <br />Shoat Strain <br />500 Rate Contow• <br />00002 <br />500 <br />00002 <br />00003 <br />300 _ 00005 <br />oooos <br />:o0 00006 <br />00007 <br />100 00008 <br />00009 <br />0 Factor of Safety: 1.88 <br />-f- - Phreanc Surface <br />inn <br />5d) Spoil 2, Toe Alva Model, Phreatic Surface at Base of Fill <br />Figure 5. FS Values for West-Section Model <br />4.0 CONCLUSIONS <br />pe sire l <br />During the course of this analysis, three different sections of the toe-buttress structure <br />along with the K-Pit backtill were investigated tier long-term stability against global slope <br />failures. Previously calibrated rock-mass parameters were assigned to the geologic tortnations <br />underneath the proposed toe buttress and the spoil within the buttress were assigned with <br />appropriate strength properties derived using previously established empirical relationships. The <br />developed models were assigned with alternative phreatic surfaces that are most likely to reflect <br />long-term seepage conditions likely to exist within the toe buttress. <br />Based on the results obtained during the analysis, it may be concluded that the current <br />toe-buttress configuration appears to be stable in the long term against global slope failure, if <br />constructed accordinu, to proper standards for such structures. Also. AAI does not foresee any <br />major tilundation failure issues with the proposed toe-buttress configuration. <br />5.0 OtitiTltU("1'1O\' 11tiPE("1-101 <br />AAI and "i_MI will work together to insure that the construction is inspected at all key <br />phases. The inspections should be at least quarterly during the following critical construction <br />phases. Inspections shall meet the tollowing requirements as directed by the Regulations of the <br />Colorado Mined Land Reclamation Board for Coal Mining': <br />(u) The fill shall he il7.Vj)eClec1.lor- stcrhilitt• hl• a registerecl engineer or other <br />ylurliliecl jlrulilssionul sitleciulist e.?llerienc eel in eonstrlic'non of eul-/h ullcl <br />rurkJill embtlnkmews i mler the clirec•tion of ti y11c11i1iet11w(?1i,ssionul engineer <br />tit least quaff-Ic'rl1' 1111•o11ghu111 the colisfi-uctiorl and chwing the following <br />' Colorado Division of Minerals and Geology (198(1) Regulations of the Colorudu Alined Lund Rec•lul»utioll Board <br />for Coal shining, effective August 30, Page 305. Section 4.09.1. <br />Agapito Associates, Inc.