Langenback, J. | RemTEC Summit, February 26-28, 2019, Denver, Colorado. 29 slides, 2019

A remedial strategy used a large-diameter auger drilling with steam and zero-valent iron injection (ZVI) system to remediate a PCE source and facilitate a transition to long-term monitoring. An 8-ft diameter auger simultaneously mixed the subsurface and introduced hot air/steam to volatilize and strip chlorinated volatile organic compounds (CVOCs) from soil and groundwater, followed by injection of ZVI as a polishing step to provide treatment of residual CVOCs. During three months of remedy implementation, 500 lbs of PCE were extracted and treated. Utilizing real-time data collection and an adaptive treatment protocol enabled immediate responses to boring-specific data observations and optimized remedial efforts to maximize treatment efficiency. Post-processing of the real-time data was performed to calculate the CVOC mass removed from each treatment boring and to visually present the distribution of mass recovered from each boring and throughout the treatment area. Over one year of post-remediation performance monitoring documented that the remedial objectives were achieved with no CVOC rebound. https://www.remtecsummit.com/ext/resources/Static-Pages/presentations/Jim-Langenbach.pdf