A Rigorous Demonstration of Permeability Enhancement Technology for In Situ Remediation of Low Permeability Media
Technical Report,24 Jul 2014,24 Jan 2019
CDM Smith Federal Programs Corporation Denver United States
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This study demonstrated the use of permeability enhancement technology i.e., environmental fracturing to facilitate enhanced amendment delivery and distribution in low-permeability materials. The overall objective of this project is to compare the performance and cost benefits of hydraulic and hybrid pneumatic permeability enhancement for in situ treatment at low permeability sites. The technology demonstration was performed at three separate sites with low-permeability lithologies including the Marines Corps Base - Camp Pendleton MCB-CP Site 1115 located in Oceanside, California the Lake City Army Ammunition Plant LCAAP Site 17D located in Independence, Missouri and the Grand Forks Air Force Base GFAFB site TU504 located in Grand Forks, North Dakota. The hydraulic approach to permeability enhancement was performed at all three aforementioned sites. In addition, hybrid pneumatic permeability enhancement was performed at LCAAP to provide a direct comparison between the hydraulic and the hybrid pneumatic approach to permeability enhancement. Advanced geophysics monitoring tools including tilt meter monitoring, electrical conductivity logging EC logging, and electrical resistivity tomography ERT were used to evaluate the vertical and horizontal extent of amendment distribution resulting from permeability enhancement, and conventional soil confirmation and groundwater performance monitoring were used to validate the geophysics monitoring tools.