As part of the sales agreement, Koppers removed chemicals in the process tanks. Dupont removed all structures from the site, which is now vacant. The treatment process Koppers used consisted of loading railroad ties and telephone poles into cylinders and pressure injecting them with creosote or a mixture of No. 2 fuel oil and pentachlorophenol. In the treatment area were a pond filled with water used for fire protection and a sump where any effluent from the treatment process was collected. These compounds are constituents of creosote.
Ground water is the most important source of drinking water in the area.
The Artesian Water Co. draws drinking water from three wells within 3 miles of the site and blends it with other water to serve its 150,000 customers. The wells tap the Lower Potomac Formation, which consists of permeable deposits and is hydraulically connected to the overlying Columbia Formation, permitting water to move between them. Wetlands are present both on the site and bordering the site. The description may change as additional information is gathered on the sources and extent of contamination.