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YIIL CONCLUSIONS <br />' Reclamation of surface facilities within the Landslide Boundary (the Substation <br />pad, Shop Warehouse pad, Portal Bench and upper portion of the Access Road) will <br />reguire.a special effort to ensure that the final post reclamation slopes remain <br />' stable.. Rio. ensure a Stability Factor- of Safety of 1.3 or more, the Dewatering <br />System which is to be installed during the initial stage of construction in these <br />areas, must remain in operation after the site has been reclaimed. The retaining <br />' walls on the downslope (or fill side) must be removed in order to return these areas <br />to their approximate original contours (AOC). This work should be done very <br />carefully in order to prevent damage to the dewatering system. The retaining walls <br />on the upslope (or cut side) of the access road can be removed or left and buried in <br />' place. These have little effect on final stability. However, the upslope (or cut <br />side) retaining walls in the vicinity of the Portal Bench and Portal Turnout should <br />be left in place since they have a tendency to increase localized stability of these <br />' areas. <br />Any construction within the Landslide Boundary will require special consideration <br />' and attention. For this reason, we believe the backfill and reclamation of theses <br />areas should be supervised by an experienced and qualified geotechnical or soils <br />engineer. <br />' sssssss <br />1 <br /> <br /> <br />Denver, April 9, 1981 <br />MERRICK do COMPANY <br />~et!// <br />Dave Frazier, P.E. <br />Project Manager <br />~~~ <br />Doug Most <br />Project Engineer <br />1 <br />' *0 15008 <br />~N ;F <br />i ~.s f <br />' ~ii9l '.~~NAL E. <br />y~~~~~/r~c'OF CO 1~ <br />1 <br />1 <br /> <br />' 15 <br />