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ENVIRONMENTAL CONSTRUCTION AND REMEDIATION Groundwater Barriers By Deep Soil Mixing Geo-Con, Inc.'s scope of work consisted of constructing two groundwater cutoff barriers within Section 36 of Rocky Mountain Arsenal. The first barrier was constructed at the Complex location and the second at the Shell location. Due to the possibility/risk of encountering highly contaminated soils and/or unexploded ordinances (UXOs), the design called for installing the proposed barriers utilizing in-situ deep soil mixing. This technique has inherent engineering features which help to control risk of volatilizing the soils during the mixing process. As an added safety factor, and due to the possibility of encountering chemical warfare material, all intrusive work was performed under level B protection. Impermix® slurry was utilized for blending with the in-situ soils due to the incompatibility/degradation of bentonite with the high concentration of brine salts within the groundwater. A total of approximately 178,800 square feet of soil-Impermix® groundwater barriers were installed. These barriers ranged in depth from 15 feet to 37 feet with a total length of 7,346 feet. Permeability of the installed barriers range from approximately 3 x 10-7 cm/sec to 2 x 10-8 cm/sec. Equipment utilized for the project included Geo-Con, Inc.'s four-shaft DSM rig and Impermix® batch plant along with various earth moving/support equipment. Despite inclement weather, the work was completed one month ahead of schedule.
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