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<br />1 <br />MINREC, INC. <br />' NORTH THOMPSON <br />1990 AHR <br /> <br />1 <br />1 <br />1 <br /> <br />1 <br /> <br /> <br />1 <br />1 <br />1 <br />1 <br />1 <br /> <br />1 <br />CREEFi MINES <br />MINE WATER QUALITY <br />Page 3 <br />The quality of the No. 3 Mine discharge is measured monthly. <br />Prior years monitoring of this discharge has been summarized into <br />a monthly format and is included in Appendix IV. The quality of <br />the discharge from the mine shows little change from previous <br />Years. <br />The quality of the No. 1 Mine discharge is presented in a <br />table in Appendix IV. As of November 1, 1989 the CDPS discharge <br />permit was revised to allow up to 3.6 ppm iron in the mine dis- <br />charge. The quality of the discharge from the mine shows little <br />change from prior years. <br />ANTICIPATED IMPACT <br />Discharge from the No. 1 mine continues to slightly impact <br />the quality of water in North Thompson Creek. The mine water <br />discharge has a low iron content and an acceptable pH, however <br />its conductivity is quite high. .4 30 gpm flow with a conduc- <br />tivity of 3000 discharging into a receiving stresm with a 5 cfs <br />flow and a conductivity of 1~0 would increase the conductivity of <br />the receiving stream to about 188 iahich is not considered sig- <br />nificant. <br />The entire mine site has been reclaimed and seeded. Good <br />plant growth occurred during 1988, 1989 and 1990. As vegetation <br />is established, the potential for drainage from the disturbed <br />area to contribute additional suspended solids into North <br />Thompson Creek is reduced. <br /> <br />