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Slurry Wall Design Report <br /> Loloff Pit <br /> 5/24/2016 <br /> Page 13 of 16 <br /> 3. Monitor all instruments and interpret readings during construction. Hall-Irwin shall notify <br /> Brierley Associates if movements in either the horizontal or vertical direction at any of <br /> the instrumentation exceeds 0.25 inch. <br /> 4. Prior to slurry wall construction, establish a baseline by surveying the survey reference <br /> and settlement monitoring points a minimum of 3 times on three separate days prior to <br /> slurry wall construction between STA. 16+00 and STA. 31+00. <br /> 6.7 Construction Water <br /> Water for construction activities including slurry and backfill mixing shall be on-site water from <br /> the existing dewatering operations or groundwater permitted for construction use. <br /> 6.8 Slurry Wall Cap <br /> Upon completion of slurry wall construction, a protective cap shall be constructed on top of the <br /> slurry wall, as shown on Sheet SH-19. This cap shall consist of a 1-ft thick layer of granular <br /> material placed over the top of the slurry wall as shown. The cap is only required between <br /> approximate STA. 10+15 and STA. 33+65 where there is no low permeability berm constructed <br /> on top of the slurry wall. <br /> 6.9 Site Reclamation <br /> After completing backfill placement, areas disturbed by construction shall be cleaned of all <br /> debris, excess excavation material, and excess slurry. Using on-site material, permanent fills <br /> will be placed as shown on sheets SH-11 through SH-17. Permanent fills have been designed <br /> to accommodate a 15-foot-wide permanent level pad at elevation 4634 ft which may be used for <br /> an access road around the future reservoir. Design of the access road is excluded from the <br /> scope of the work. <br /> The temporary fill slopes required as part of the work pad construction are not intended to be <br /> incorporated into the final reclamation slopes, and Brierley has assumed that these fills will be <br /> removed prior to constructing the permanent reservoir slopes. If temporary fills associated with <br /> the work pad construction will ultimately be incorporated into the permanent reservoir slopes, <br /> these fills will be required to be compacted in place during construction in accordance with <br /> specification section 31 23 00. Final cut and fill slopes around the site should have a maximum <br /> slope of 3H:1V. Design of the permanent reservoir slopes, with the exception of those shown on <br /> sheets SH-11 through SH-17 are excluded from the scope of work. <br /> 6.10 Temporary Excavation Slope Considerations <br /> After installation of the slurry wall, the crest of any temporary excavation slopes required for <br /> mining operations shall be a minimum distance of 10 ft from the edge of the slurry wall and <br /> slopes shall be 2H:1 V or flatter, as shown on sheet SH-19. Mining closer to the slurry wall than <br /> the limits described herein may jeopardize the stability of the slurry wall. <br /> BRIERLEY <br /> ASSOCIATES <br /> Creating Space Underground <br />