Interim Remedial Soil Excavation and Ferox In Situ Treatment
Project Name: Manufacturing Facility
Client: Government Agency
Location: Down State New York
Impact Characterization: Release of unknown quantities of chlorinated solvents, including Freon 113, resulting in an adverse impact to the subsurface soil and groundwater regimes. Sensitive receptors to the release include a regulated wetland area.
Technical Overview: PES initiated its site involvement with a technical evaluation of (existing) subsurface investigation and groundwater monitoring files. A limited subsurface investigation was conducted to pre-characterize soil associated with a documented Freon 113 impacted area. The remedial approach was tailored to provide substantial financial relief for the project by pre-planning and live-loading contaminated soils as well as to accelerate contaminant mitigation.
The presence of Freon 113, necessitated additional pre-remedial action planning that included the creation of a Site Management Plan, Erosion Control Plan, CIH certified Health and Safety Plan, and Soil Transportation Plan.
Following diversion of the drainage utility by PES the remedial soil excavation phase of the project commenced utilizing cut and fill excavation methodology. Excavation direction was performed utilizing regular field screening via a properly calibrated photo-ionization detector (PID) and head space methods during the excavation process. A total of approximately 100 tons of impacted material was excavated, transported to, and disposed of at Seneca Meadows.
Documentation of the end result of the excavation on the environmental quality of the site’s soil was provided through the collection of soil samples for laboratory analysis. Resulting data was used to confirm compliance with the project objectives.
PES in conjunction with ARS Technologies implemented Ferox Technology at the subject site. The injection process was implemented to facilitate the in situ reduction of documented halogenated compounds. The Ferox technology process consisted of multi-phase injection (using a gas carrier) and emplacement of specific quantities of highly reactive zero-valent iron (ZVI) powder directly into identified subsurface contaminant zones.
The Ferox Technology provided direct treatment of the target organics. In addition, the process creates favorable in situ treatments areas down gradient of the primary target area. To maximize the dispersion of the ZVI powder, ARS utilized a gas-based atomization approach. Pneumatic fracturing methods were utilized (where required) to enhance existing fractures and planes of weakness surrounding each injection well. The enhancement of the fracture network provides increased reagent distribution.