Fanwood Creosote Site

In-Situ Geochemical Stabilization (ISGS) was utilized at a site located near Fanwood, New Jersey to remediate soils and groundwater impacted by the historical release of creosote and heavy ended petroleum compounds.

The compounds of concern included benzene, Benzo(a)anthracene, Benzo(a)pyrene, and multiple other VOC and SVOC contaminants. The in-situ program covered a total area of 8,955 square feet and treated soil and groundwater from 5-10 ft below ground surface.

The remedial liquids were injected into 44 points via direct push technologies. Two intervals from 5-7 and 8-10 feet below ground surface (bgs) were used to inject the liquids into the targeted media affecting a radius of 7.5 feet for each point.

In-Situ Geochemical Stabilization (ISGS) entails the use of modified permanganate solutions for the purposes of mass removal and flux reduction (i.e., NAPL stabilization). As the oxidant migrates through the treatment area, various biogeochemical reactions destroy the targeted compounds present in the dissolved phase.

This causes a "hardening" or "chemical weathering" of the NAPL as it steadily loses its more labile components, resulting in a net increase in viscosity of the organic material, yielding a more stable, recalcitrant residual mass.

The insoluble MnO₂ precipitate that results from permanganate oxidation and other mineral species accumulate along the NAPL interface, physically coating the NAPL and thereby reducing the flux of dissolved-phase constituents into the groundwater.

Unlike typical ISCO applications, ISGS is used to encapsulate NAPL, with chemical oxidation being a secondary effect. The overall oxidant dosing is often substantially less than typical ISCO applications, resulting in rapid, highly effective treatment at a much lower cost.