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<br />t. <br />t <br />., <br />R" <br />g <br /> <br />i <br />l <br />Y <br />`I` , <br />,4ore recent data fr~groundwater and gas ronitorin~in the CPI <br />railway tunnel could indicate that waste disposed in the Detroit <br />River Group may have entered the freshwater aquifer. In <br />addition, temporal variations of chloride concentrations and the <br />ca,pJSition of gases entering the tunnel suggest that the <br />operation of gas caverns in the Salina Formation influences <br />movement of contaminants within and above the Detroit River <br />Group. This is an area which will require further investigation. <br />although industrial disposal operations have ceased, salt mina <br />wastes and oil field brines have continually been disposed in <br />the Detroit River Group. These activities, along with r=_sidual <br />pressures in the Detroit River and possibly, the storage of gas <br />and propane in salt cavens, may result in the migration o`_ <br />pollutants fran the deep ~.e11s up~~ard into the freshwater <br />aquifer and subsequently into the river. <br />