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• concentration for the 7 North Angle discharge decreased in 1994 to about 1000 mgll as <br />compared to 1285 mg/I in years 1991 and 1992. This trend is related to the accumulation <br />of water in the North Angle Sump location while the pump was out of order. This water <br />was allowed to equilibrate within old workings and rubbelized subsidence panels. The <br />maximum concentrations of 1474 mg/I represents this equilibrium concentration and also <br />provides an indication of the expected post mining TDS concentrations in rubbelized zone <br />and underground mine workings. Likewise, this decrease illustrates the effects of flushing <br />upon the TDS concentrations with normal periodic discharge. <br />• <br />• <br />2 <br />