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Brannan Aggregate hired Hall-Irwin to construct two slurry walls around cells 7A and 7B of their Morton Lakes mining site in Fort Lupton. We conducted preconstruction design meetings with the engineer to establish the alignment and ensure maximum allowable storage. We also coordinated with the owner to temporarily move their conveyor belts, fill a tunnel, and move several stockpiles to neighboring sites before work began. This spring's heavy rains have complicated construction, filling both cells with water and blowing out a portion of cell 7A's already completed wall. This pushed back the schedule as we had to allow the ground to dry out before installing the cap over 7B's wall, and then went back to reinstall the compromised section of 7A. Our working relationship with Brannan has been excellent throughout, and they will soon have two functioning, certified slurry walls.