Superfund Site: OLIN CORP. (MCINTOSH PLANT)
Superfund Site Profile
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The Olin Corp. (McIntosh Plant) site is located in McIntosh, Alabama. It includes an area where the Olin Corporation (Olin) has operated a chemical manufacturing facility since 1952. EPA placed the site on the Superfund program’s National Priorities List (NPL) in 1984 primarily because of contaminated groundwater resulting from facility operations. In 1987, Olin started treating contaminated groundwater under the Resource Conservation and Recovery Act (RCRA) corrective action program. The plant is both a RCRA facility and an NPL site.
The site is located one mile east-southeast of McIntosh in Washington County, Alabama. Site surroundings include the Tombigbee River to the east and residential and commercial properties to the west. The Ciba-Geigy Corporation (Macintosh Plant) site borders the site to the north and River Road runs along the site’s southern edge. Broader site surroundings include industrial, commercial, agricultural and residential land uses. The main plant and associated properties cover about 1,500 acres. From 1952 until 1982, Olin produced chlorinated organic pesticides, chlorine, caustic soda and sodium hypochlorite at the site. Presently, Olin produces chlorine, caustic soda and sodium hypochlorite and blends and stores hydrazide compounds at the site.
EPA, the Alabama Department of Environmental Management (ADEM) and Olin, the site’s potentially responsible party (PRP), have investigated site conditions and taken steps to clean up the site in order to protect people and the environment from contamination. Site investigations and cleanup activities have focused on two areas, which EPA refers to as operable units, or OUs. These area include OU-1: the active production facility, solid waste management units (SWMUs) and the upland area of the Olin property; and OU-2: the Olin Basin located next to the Tombigbee River, a floodplain and a wastewater ditch leading to the basin.
Under OU-1, by monitoring and treating groundwater, complying with RCRA requirements, enforcing institutional controls and conducting required Five-Year Reviews, EPA, ADEM and the site’s PRP continue to protect people and the environment from OU-1 site contamination.
A Record of Decision for OU-2 was completed in April 2014.The selected remedy is an in-place cap with institutional controls and monitoring. This remedy will address the remaining contamination in the Olin Basin located next to the Tombigbee River.
A fish consumption advisory is in effect for part of the Tombigbee River near the site.