The Butler Mine Tunnel site is located in Pittston Township, Pennsylvania. The tunnel was constructed in the 1930s to provide mine drainage for an estimated 5-square-mile area of underground coal mines. Illegal disposal of liquid industrial wastes into a mine ventilation borehole at the Hi-Way Auto Service (HWAS) Station contaminated the underground mine areas drained by the tunnel. In 1985, the tunnel discharged about 100,000 gallons of waste oil into the Susquehanna River, following heavy rains associated with Hurricane Gloria. These activities contaminated surface water with hazardous chemicals. Following cleanup, operation and maintenance activities are ongoing.