Do you have any reasonable idea of what caused that contamination?
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Somalians using it as a bathroom.
And it is no longer Lake Calhoun, that is racist.
http://www.minneapolisparks.org/news/2018/01/29/lake_calhoun_officially_recognized_as_bde_maka_ska/
Is this a joke? B-day...really? So it is a toilet then, officially.