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NPL Site Narrative for Lehillier/Mankato Site
LE HILLIER/MANKATO
Le Hillier/Mankato, Minnesota
Federal Register Notice: September 8, 1983Conditions at listing (July 1982): The Le Hillier/Mankato Site covers 6,400 acres in Le Hillier, just west of Mankato, Minnesota. In October 1981, the State discovered chlorinated organic solvents in the community's ground water. The contamination may come from degreasers used in cleaning local septic tanks.
Le Hillier is located in a floodplain of the Blue Earth and Minnesota River. Until 1976, when the U.S. Corps of Engineers constructed a dike around this area, it was subject to seasonal flooding. The contaminated area of Le Hillier/Mankato has permeable soils that allow liquids to infiltrate rapidly into the aquifer, thought to be 20 to 25 feet below the surface; bedrock (sandstone) is at about 60 feet.
Status (July 1983): EPA and the State are conducting a preliminary hydrogeological study of this area to determine the source(s) of contamination and the extent of the contaminated plume of ground water.
For more information about the hazardous substances identified in this narrative summary, including general information regarding the effects of exposure to these substances on human health, please see the Agency for Toxic Substances and Disease Registry (ATSDR) ToxFAQs. ATSDR ToxFAQs can be found on the Internet at http://www.atsdr.cdc.gov/toxfaq.html or by telephone at 1-888-42-ATSDR or 1-888-422-8737.