The ESCO Manufacturing site in Greenville, Texas was used from 1945 to 1991 to manufacture and repair electrical transformers and switchgear. Investigations in the 1980s found improper disposal of transformer oil on site. Testing in the 2000s detected very high levels of toxic PCBs in soil down to 15 feet deep, and in a nearby ditch. PCBs, asbestos, lead and other contaminants were found on site and in surrounding properties. Cleanup plans are underway to excavate contaminated soils and replace them to address risks to local residents and the environment from site contamination.