St. Albans Former Gas Station

The site is a former gas station located in St. Albans, West Virginia. The site was contaminated with benzene, toluene, ethylbenzene, xylene (BTEX), methyl tert-butyl ether (MTBE), and tert-butyl alcohol (TBA).

The area of concern was approximately 3,775 sq ft with a target vertical interval from ca. 6 to 12 feet below ground surface (ft bgs). The geology at the site is primarily clay with depth to groundwater at ca. 5 ft bgs. Two monitoring wells were addressed during the injection program, MW-5R and MW-9.

IET applied Provect-OX to the subsurface via a patented injection process and apparatus (US Patent 7,044,152) such that the activation processes occur in a controlled manner. A total of 19 injection points and 7,300 lbs of Provect-OX were utilized to treat the area of concern.

The Provect-OX rapidly oxidizes the organic contaminants present in soil and groundwater and provides long-term, sustained secondary bioremediation to manage residuals and prevent contaminant rebound. This is accomplished by using ferric iron (Fe III) as a safe and effective means of activating persulfate, which quickly yields sulfate and ferrate radicals for chemical oxidation treatment.

The process also enhances subsequent utilization of sulfate and iron as terminal electron acceptors for facultative redox reactions to support secondary biodegradation of any residual contaminant mass.

Field, geochemical and volatile organic compound data demonstrated successful treatment. Chemical oxidative conditions were evident during the first post-treatment sampling event, followed by a transition to reducing environments favorable for biological attenuation.