The Suffern Village Well Field site is located in Rockland County, New York. The Village of Suffern operates four production wells that provide water to approximately 12,000 people. In September 1978 monitoring activities detected 1,1,1-trichloroethane (TCEA), a common industrial chemical compound, and trace VOCs in the municipal water distribution system. In December 1978, wells 1,2 and 4 with TCEA levels of 90-114 ppb were shut down. Municipal water supply requirements were met by well 3. A subsequent survey identified the Tempcon Corporation, a small local oil burner reconditioning business, as the source of TCEA. In January 1979, Tempcon ceased using a seepage disposal pit and TCEA-based cleaning products. By March 1979, removal of waste material and excavation and devolatilization of contaminated soils were completed. A spray aeration treatment system was then implemented to remove TCEA from the municipal water supply. Monitoring results indicate TCEA levels in the four wells below the New York State Department of Environmental Conservation (NYSDEC) guideline of 50 ppb.