Envirochem, NSL, and GLA sites, all located in Boone County, Indiana, are within the Pinley Creek watershed, which is part of the Eagle Creek Reservoir. Eagle Creek Reservoir serves as a public water supply for the City of Indianapolis. An unnamed ditch, which runs north and south between the Envirochem and NSL sites, and runs along the western boundary of the NSL, discharges to Pinley Creek. Envirochem and NSL, which are adjoining properties, were placed on the National Priorities List (NPL) in 1983 and 1984, respectively. Both Envirochem and NSL accepted solid and hazardous wastes. During 1989, synthetic fuels from the Envirochem site that were stored at the GLA site were released to the environment.

The 6.5 acre site was used as a solvent processing and reclamation facility from 1977 to 1982. Wastes such as resins, paint sludges, waste oils, and flammable solvents were received and stored on the site in drums and bulk tanks. On-site accumulation, unauthorized discharge of contaminated stormwater, poor management of drum inventory, unapproved burning of chlorinated hydrocarbons and other solvents, and spills prompted a site investigation conducted by the State and the U.S. Environmental Protection Agency (USEPA).