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Pumpage in Illinois has exceeded the practical sustained yield every year since 1958 while in Wisconsin the practical sustained yield was reached about 1975. Two regional pumping cones have developed. One centered in the Chicago region has maximum drawdowns of more than 900 feet (275 m) while ...
Although Great Lake Region (including Illinois, Indiana, Michigan, Minnesota, Ohio, and Wisconsin) only has 16 % of the U.S. population, it owns 25 % of all the TRI facilities, most of which are concentrated in toxic release-intensive sectors of the fabricated metals (i.e., manufacture ...