TN001 – Ferox™
Military Facility – Memphis, Tennessee
ARS completed the installation of a Ferox™ system to treat a CVOC source area with TCE and 1,1,2,2 PCA at a former military facility in Tennessee. The field effort consisted of a grid of 4 injection wells to emplace 25,000 lbs. of ZVI within the subsurface. During the injections, pressure influence at a distance of more than 25 ft. was observed. Sampling results three months after the injections showing 1,1,2,2 PCA concentrations to have been reduced by as much as 93% from a maximum of 40,800 ppb to 3,010 ppb within the center of the treatment zone. The majority of the monitoring points within the treatment zone have shown at least a 90% reduction in 1,1,2,2 PCA levels within the 3-month post-injection monitoring time-frame. This project also represented the first field application of a new integrated deep well drilling/injection method. Using sonic drilling, a pressurized water column advanced a 4-inch casing to the target injection depth in each hole. Once at depth, atomized slurry injections were applied to the formation as the casing was retracted from the hole. This innovative method offers several key advantages over conventional injection methods, for example: the ability to apply materials/chemicals at depths of several hundred feet, applicability in virtually all soil types, reduced quantity of soil cuttings, reduced field personnel exposure to hazardous chemicals as well as access to a very effective seal to facilitate good dispersion of the material into the subsurface.