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Slurry Wall Design Report <br /> Loloff Pit <br /> 5/24/2016 <br /> Page 10 of 16 <br /> Percentage of Mix Design Components <br /> Mix Design A— Davis Farms Mix Design B— Derr Import <br /> Fines <br /> Dry Unit Weight Volume Basis Dry Unit Weight Volume Basis <br /> Basis Basis <br /> Sand 75% 73% 57% 55% <br /> �S­upplemental Fines 25% 27% 43% 45% <br /> To yield 1.0% dry-added bentonite, 1,067,600 lb of dry powdered bentonite is required. This <br /> amount does not include the bentonite needed to make slurry. The distribution rate for the mix <br /> design components has been determined for various reaches of the alignment as shown on <br /> Table VI. <br /> Water at the site tested very hard (740 mg/L CaCO3). The impact of this is that the lab had <br /> to add 9.5% bentonite to the water to generate a slurry that meets the slurry <br /> specifications (marsh funnel viscosity> 40 seconds). If the marsh funnel viscosity can be <br /> obtained, as little as 5% bentonite in the slurry is allowed per the project specifications. <br /> One option to achieve this is to add soda ash to "soften" the water and increase <br /> bentonite yield. <br /> The backfill mix design is detailed in Specification Section 31 56 00. <br /> BRIERLEY <br /> ASSOCIATES <br /> Creating Space Underground <br />