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<br />Memo to Bruce Humphries -2- April 21, 1942 <br />There is no leak detection system for the tailings impoundment. If an <br />unsaturated flow occurs which transmits contaminents to the water-table, the <br />first indications will be at the down-gradient monitoring wells. Long-term <br />monitoring of these wells is imperative, as it appears that a two-foot head on <br />the geo-membrane would result in an increase in sub-soil moisture content that <br />would lead to unsaturated flow to the water-table. As stated in my memorandum <br />dated April 14, 1992, a one-foot head on the liner should not result in <br />exceedence of the specific retention of the impoundment sub-soils and <br />subsequent unsaturated flow to the water-table. <br />ACS/bjw <br />Enclosure <br />2682E <br />