CA006 – Ferox™, Pneumatic Fracturing
Industrial Facility, Carson, California
Figure 1: Pneumatic Fracturing Event in Carson, California
A successful pilot test lead to a full-scale implementation of Pneumatic Fracturing (PF) and proppant injection at a former industrial facility in Carson, California. The existing SVE extraction system installed to remove extensive PCE contamination within the unsaturated soils had reached an asymptotic mass removal. The objective of the PF application was to enhance the extraction rate by increasing the bulk permeability of the treatment zone to achieve additional mass removal.
ARS fractured 45 boreholes between the depths of 40 ft. bgs and 35 ft. bgs in a silty and clayey sand formation while injecting a sand proppant to maintain the aperture of the created fractures in facilitation with the vapor extraction of the system.
After the Pneumatic Fracturing application, 12 of the 45 boreholes were converted into additional SVE extraction wells. Immediately after the conversion, they produced the highest VOC recovery rates of all the SVE wells at the site. One year after the PF implementation, 6 of the converted wells were still extracting significant quantities of PCE.