A view of the Lansing Plant 2 RACER site where the use of a propane biosparge system is proposed to clean up 1,4 dioxane clean up on Thursday, April 11, 2019, in Lansing, Mich. The underground plume of chemical pollution at the site of a former GM plant is creeping toward wells that supply some of the Lansing region's drinking water. (Nick King/Lansing State Journal via AP)
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