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FMC Corporation (Fridley Plant)
The 18-acre FMC Corporation (Fridley Plant) is a United States Environmental Protection Agency Superfund site located in Anoka County, Minnesota, several hundred feet east of the Mississippi River. Solvents, paint sludge, and plating wastes were generated and disposed of in an on-site dump from the 1940s until 1969. Minnesota Pollution Control Agency (MPCA) staff sampled site surface and groundwater in the early 1980s and confirmed that ground and surface water were contaminated by industrial solvents. In the 1980s, solvents from the site were detected in the city of Minneapolis drinking water system intake that is located downgradient of where the FMC site groundwater contaminant plume enters the river.
To address this, the Minneapolis surface water intake was moved further downstream and into the center of the river. Regular sampling of the water from the intake has shown no exceedences of contaminants since the 1980s. Because of the threat posed to Minneapolis drinking water, this site received one of the highest Hazard Ranking System (HRS) scores of all sites on the Superfund National Priorities List (NPL). However, that threat was mitigated by relocating the intake. Cleanup work at the FMC site was initiated in the 1980s, and the groundwater extraction wells that were installed as part of the remedy have been in operation since that time.
==Threats and contaminants==
FMC site groundwater is contaminated with volatile organic compounds (VOCs) including trichloroethylene (TCE). Soil that was excavated in the 1980s was also contaminated with TCE. The main health risk at the FMC site would be if someone were to use contaminated groundwater as a drinking water supply. TCE believed to be from the site was detected in high concentrations in groundwater wells located near the Mississippi River and is believed to have contributed to the detection of VOCs in the Minneapolis drinking water supply intake in the 1980s. However, the surface water intake was moved further downstream and no exceedences of VOCs have been detected in the intake since that time. In addition, because no private drinking water wells are in the area, no residents are directly exposed to the contaminants in the site groundwater.
抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』
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