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EVO/BIOAUGMENTATION FOR TREATMENT OF TRICHLOROETHENE BY BIOBARRIER AND SOURCE INJECTION APPROACH
Fogas, C., M. Kozar, B. Bakrania, and E. Schleicher.
Fourth International Symposium on Bioremediation and Sustainable Environmental Technologies, May 22-25, 2017, Miami, FL. 30 slides, 2017

Enhanced in situ bioremediation using emulsified vegetable oil (EVO) was selected to treat chlorinated VOCs (mainly TCE, >10 mg/L) in groundwater in a glacial till aquifer beneath an urban setting to remove the source and provide for monitored natural attenuation. The 900 ft long plume originates in an on-site source area in the upper portion of the aquifer and follows a downward gradient to the lower portion of the aquifer off site. A lens of more uniform clean sand occurs in the till at depth and represents a preferential flow pathway. The 100 ft thick impacted glacial till aquifer lies over a less impacted Triassic basin bedrock aquifer. EVO plus bioaugmentation was selected for long-term passive treatment in this difficult urban setting. A total of 25,937 lbs of Newman Zone® Standard EVO at 10% concentration (31,438 gal in solution) was injected in the bioremediation treatment zones over a period of 14 days. Injection through permanent monitoring wells (installed by rotosonic drilling) was selected owing to the difficult drilling environment (tight till with gravel and cobbles). This presentation outlines the remedial approach, implementation, and progress. https://www.obg.com/uploads/insights/Battelle_Presentation_Fogas.pdf



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