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1 <br />MINREC, INC. Page 2 <br />' NORTH THONIPSON CREEK MINES <br />1990 AHR <br />' GROUND WATER QUALITY <br />' The results of monitoring wells D-lA and D-2A which are lo- <br />cated near the toe of the refuse pile are presented in Appendix <br />II. D-lA is directly below the refuse pile and D-2A is 200 feet <br />' to the west of D-lA. Monitoring results for prior pears are sum- <br />marized by quarter to make it comparable to the current monitor- <br />ing schedule. <br />' Graphs have been prepared which show quarterly water level <br />and conductivity measurements for both wells. The water level <br />measurements for the year were consistent with prior years data. <br />The conductivity measurements were also consistent with prior <br />years. The pH measurements for the wells were similar to prior <br />.years monitoring. <br />' MINE FLOWS <br />' Water from the No.l Kline continued to be treated and dis- <br />charged to North Thompson Creek during the year. During Septem- <br />ber 1989 a third settling pond was constructed on site to handle <br />' the No. 1 Mine water. The new pond is referred to as the long <br />pond. The additional settling time provided by the long pond is <br />adequate to allow the iron to settle from the mine water and be <br />in compliance for discharge into North Thompson Creek. No chemi- <br />cals have been added to the mine water since the long pond was <br />put in service. The lone pond worked very effectively during <br />1990. <br />' All of the water flowing into the No. 1 Mine is being al- <br />lowed to flow out of the mine into the treatment ponds. Measure- <br />' ments of the water level in the mine show that the level of water <br />inside the mine has been stable during the year. <br />' The No. 3 Mine continues to discharge water which is piped <br />from a point source inside the mine. The mine is also filling <br />with raster. The rate at which the mine is filling has slocaed <br />significantly during the past year. In the preceding 12 months <br />t the mine has filled at a rate of 0.36-feet per month. In the <br />preceding 3 months the mine has filled at a rate of 0.13-feet per <br />month. Before the mine discharges it must fill another 10.7 <br />feet. If the mine continues to fill at the 0.36-feet per month <br />rate, it will be full to the point of discharge in about 30 <br />months. A table of the No. 3 Mine water level measurements and a <br />' graph which shows the increase in water level over time are <br />presented in Appendix III. <br /> <br />