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This article is largely a copy paste from http://www.epa.gov/R5Super/npl/minnesota/MND980823975.htm. As the EPA material is pulic domain, this is acceptable (I've added an attribution template to note the source). However, it is not great practice to use a single source which may not be unbiased. The artcicle could be impriioved by adding material from other references. See also discussio at MRG talk page on this issue
