Sampling of the Kalamazoo, Mich., water supply indicated unacceptable levels of tetrachloroethylene from an unknown source In a portion of the city's water distribution system and in one of the city's well fields. Sequential test wells were drilled to identify the source of contamination and to plot its movement through the aquifer. Purge wells now protect the remainder of the well field from future contamination by the abandoned dry cleaning business that was found to be the source of the contamination.
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