EPA Superfund Program: MASON CITY COAL GASIFICATION PLANT, MASON CITY, IA

Superfund Site Profile

The 2.3-acre Mason City Coal Gasification Plant Site is located in downtown Mason City, Iowa. Beginning in the early 1900s, the site was the location of a manufactured gas plant which produced gas for lighting and heating purposes in the Mason City area. When natural gas became available, the plant was decommissioned and subsequently demolished. Residues from the gas manufacturing processes, commonly referred to as coal tar, were left on-site and resulted in soil and groundwater contamination. In June 1984, the city began excavation at the site for the installation of a new sewer line. During this excavation, coal tar was discovered in the subsurface soil and in subsurface structures. Approximately 1,000 to 1,500 gallons of coal tar were mixed with sand and deposited in an above-ground waste pile on the site. 

The contaminants associated with the production of manufactured gas include a group of compounds referred to as polynuclear aromatic hydrocarbons. Other contaminants found at manufactured gas plant sites include benzene, toluene, ethylbenzene and xylene. Some forms of cyanide, arsenic, phenolic compounds and metals may also be found.



The contaminants associated with the production of manufactured gas include a group of compounds referred to as polynuclear aromatic hydrocarbons. Other contaminants found at manufactured gas plant sites include benzene, toluene, ethylbenzene and xylene. Some forms of cyanide, arsenic, phenolic compounds and metals may also be found.


 

 

 


SITE STATUS

Construction
Complete?
Yes (04/28/2008)
Human Exposure
Status

Under Control
Contaminated Ground
Water Status
Under Control
Site-Wide Ready for
Anticipated Use?
Yes