U.S. EPA Superfund Project Website, 23 Oct 2018

The Vineland Chemical Company operated from 1949 to 1994 and produced arsenical herbicides and fungicides. The company stored by-product arsenic salts in open piles, lagoons and chicken coops, which led to contamination of groundwater, surface water, sediment, and soil throughout the area. To address arsenic-contaminated soil (OU1), EPA constructed an innovative soil washing facility that processed 70 tons of soil per hour. The facility processed over 400,000 tons of arsenic-contaminated soil and sediments until completion of the remedy in 2014. A pump-and-treat operation captures the flow of arsenic-contaminated groundwater from the plant site (OU2). Certain areas of exposed sediment/soil of the Blackwater Branch floodplain (OU3) became recontaminated with arsenic due to contaminated groundwater reaching the sediment/soil during ongoing implementation of the OU2 remedy. A ROD Amendment for the site was signed in September 2016 [https://semspub.epa.gov/src/document/02/393184] that modified the original OU3 remedial action to include in situ treatment, hot spot excavation, and performance monitoring. Subsequently, a pilot-scale air sparging system was installed at OU3 to effect treatment by injecting oxygen into the ground, causing a reaction with the arsenic that makes it immobile and insoluble. The pilot system was tested in 2016 in one portion of the plume and expanded to an adjacent area in 2017. The pilot system is described in slides at https://www.obg.com/uploads/insights/NSPE2018_DiMarcello-Vineland.pdf.