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<br />• <br />• <br />Stream Flow CFS TDS Mg/1 <br />Alluvium 0.091 2800 <br />NF Gunnison 21 100 <br />Weighted Average 21.091 112 <br />Minimum River Flow - 21 CFS USGS Gauging Station 1976 - <br />1989. The value for total dissolved solids concentration for the <br />river is from recent sampling b.y Somerset Mining Company. The <br />TDS concentration for AA1 is the maximum value for the period <br />1983 throu,eh 1990. <br />Based upon the above calculation, the flor+ of contaminants <br />from the alluvium into the North Fork of the Gunnison River will <br />not have a measurable impact on the quality of water in the river <br />or the alluvial valley floors that are downstream of the Bear No. <br />3 Mine. <br />There is another theor,v regarding the contamination of r+ell <br />AA] that, is worthwhile explaining. It is believed that the <br />source of contaminants is springs and seeps located at the inter- <br />face of the alluvium and the hillside and not the coal or gob <br />stockpiles. These contaminants did not effect AA1 from 1983 to <br />1985 because of the high water level in the alluvium. The con- <br />taminants in AA1 became apparent at the same time the r+a ter level <br />in the alluvium dropped, because of abnormally low flows in the <br />river. This theory may be "tested" during 1991 because the flows <br />in the river are expected to be closer to normal. <br />r1RR <br />J <br />