| Approximately 50,000 gals. of gasoline leaked from underground storage tank in the Hazleton, PA area, producing a vapor threat to about 400 homes from the flow of the gasoline into sanitary sewer lines. In 1993, the PADER found that the gas was migrating through the sewer trench. Sewer vent traps were installed and an underflow drain was constructed to reduce the flow of gasoline in the Black Creek waterway. In 1996, the USEPA/ERT and the USACE developed a computer model to track the flow of the spill and installed soil-vapor extraction systems. A response and cleanup plan was instituted, includuing placing sewer vent traps in all the homes, installing temporary carbon-air filtration systems where necessary, installing soil-vapor recovery systems, and replacement of part of the sewer line. Additional soil-vapor extraction and biosparging was used to reduce the gasoline plume. A community information trailer was set up on the property to serve as a clearinghouse for the residents, with daily and weekly fact sheets and press releases. Running time is 14 minutes. |