AMEC-BCI has provided services to Nu-West Industries at their Conda Phosphate Operations, in Soda Springs, Idaho for more than 10 years. Work at the site included the design, permitting and construction oversight of the first phase (125 acre cell) of a new gypsum disposal stack to manage the 1,800-acre-feet of gypsum slurry produced yearly at the site. AMEC-BCI is currently working on the design of the second phase of the stack, which will ultimately encompass approximately 300 acres. The gypsum stack was the first constructed in Idaho using the current Florida rules for gypsum stack construction.
The near surface stratigraphy of the site, located on the west edge of the Aspen Range Mountains, generally consisted of varying thicknesses of hillside wash, sand, silt, and lacustrine silt/clay materials. Portions of the site were underlain by shallow vuggy olivine basalt rock. Due to the variable subsurface conditions, the exposed rock areas required treatment prior to construction. In addition, non-plastic, low density silts susceptible to liquefaction during seismic events were present at the site and required consideration during design.
Phase I of the project was completed and constructed to meet the clients time constraints and has operated successfully.
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