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Slurry Wall Design Report <br /> Loloff Pit <br /> 5/24/2016 <br /> Page 1 of 16 <br /> 1 INTRODUCTION <br /> The Loloff Pit site is located in Greeley, Colorado as shown in Figure 1. Loloff is planning a soil- <br /> bentonite backfilled trench ("slurry wall')which will be installed from elevation 4634 ft into the <br /> underlying bedrock. The slurry wall will enclose an area that is an active mine site; it will function <br /> as a groundwater barrier. Performance of the liner and bedrock will eventually be demonstrated <br /> using a 90-day liner test as defined by the "State Engineer Guidelines for Lining Criteria for <br /> Gravel Pits (August 1999)". We designed the slurry wall to withstand up to 67 ft of differential <br /> water head from outside the slurry wall to inside the pit; dewatering the pit to bedrock will result <br /> in this differential. <br /> The proposed slurry wall will be approximately 5,574 ft long. The minimum depths of the slurry <br /> wall will range from approximately 45 to 75 feet, with an average trench depth of 60 ft and will <br /> be a minimum of 36 inches wide. The slurry wall backfill will consist of a low permeability soil- <br /> bentonite mixture. Parts of the slurry wall will be capped with a low permeability berm. Brierley <br /> Associates has been retained by Hall-Irwin Corporation (Hall-Irwin) to perform geotechnical <br /> investigation and design for the slurry wall and low permeability berm. Hall-Irwin will construct <br /> the slurry wall and low permeability berm for Loloff Construction (Owner). <br /> BRIERLEY <br /> ASSOCIATES <br /> Creating Space Underground <br />