In-Situ Chemical Oxidation of Saturated and Unsaturated Petroleum-Containing Soils at a Historic Railroad Site

摘要

Malcolm Pirnie, Inc. was retained to evaluate and implement remedial alternatives to address soil containing diesel fuel compounds at a former railroad engine house facility in upstate New York. Due to the presence of historic structures and on-site operations, soil excavation was not practical. Traditional in-situ approaches would not have achieved site closure within the client's timeframe. Based on these site constraints, in-situ chemical oxidation was chosen as the preferred remedial alternative. A targeted treatment program was used to remediate unsaturated and saturated soils. This program consisted of multiple injections at varying depths within each of 148 temporary Geoprobe~® injection points during two, separate, 10-day treatment events. The use of in-situ chemical oxidation at this site greatly reduced the time and cost required for treatment. The actual treatment time was less than three months. The results of the post-treatment samples show that the concentrations of volatile and semi-volatile organic petroleum compounds were reduced by approximately 70 percent, while the total petroleum hydrocarbon concentration was reduced by nearly 50 percent. The project has shown that the use of this technology can be as effective as traditional in-situ treatment technologies used for treating unsaturated and saturated subsurface diesel fuel contamination.