Key to the innovative method of reducing petroleum-based contamination is addition of manufactured bacterial cultures to soil windrows and frequent machine aerating to maximize natural digestion of organic contents. Expected costs and project time were cut 50 to 75 percent, and the resulting material met all environmental standards for reuse in refinery tank farming, filling and other applications. No incineration, transportation or landfilling of materials was necessary, and imported material needs also were reduced. Savings ranged up to $200 per ton for hazardous soils.
The Brown Bear 500 tractor was able to auger up to 3,000 cubic yards of soil per hour, achieving faster decomposition.
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