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ENVIRONMENTAL CONSTRUCTION AND REMEDIATION Deep Soil Mixing Geo-Con's DSM technique is a highly effective contaminated soil treatment application that occurs without excavation or soil removal. DSM allows soil and wastes to be treated homogeneously in-place to depths of 120 feet. DSM has been proven successful in a remedial operation conducted under the auspices of the USEPA's Superfund Innovative Technology Evaluation (SITE) Program. Water table elevation has little effect on the process. In fact, DSM has been performed under water from barge-mounted equipment. The DSM system makes use of a crane-supported set of leads that guide a series of hydraulically driven mixing paddles and augers. As the ground is penetrated, a grout or other reagents, stored via pigs or silos and mixed at the batch plant, are fed through the center of each shaft. The auger flights loosen the soil to mix and remix it with paddles, which blend the stabilizing reagents with the soil. As the augers advance to a greater depth, the soil and reagent are remixed by the additional mixing paddles on each shaft. When the desired depth is reached, the augers are withdrawn and the mixing process is repeated on return to the surface. A continuous 30-inch-wide wall or stabilized block of soil is left behind without removing material, resulting in treatment of contaminated soil. DSM equipment uses four in-line mixing shafts, each producing a 36-inch diameter mixed column of soil. Due to the spacing of the shafts, there is continuous overlap with adjacent soil columns. As the equipment is currently configured, the depth capability is to 120 feet depending on the soil and its consistency.
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