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Mr. Larry Perino <br />October 24, 1994 <br />Page No. 3 <br />c) The post plugging monitoring program must be able to identify any discharges that reach Cement <br />Creek downstream of the American Tunnel, and must continue long enough to allow any such <br />discharges to appear. The monitoring program must continue long enough to insure that there has <br />been adequate time for any seepage from the mine workings, or other potential sources of <br />pollutants, to have reached the surface. We feel that the monitoring plan must be modified to <br />adequately characterize water quality. Please see our letter of March 23, 1994 for a further <br />discussion on this. It was my understanding that Sunnyside would be setting up a meeting to <br />have technical representatives discuss the monitoring plan in further detail. <br />d) It should be noted that while the chronic WET toxicity level of 1.6 mg/1 for bromide is associated <br />with the LC effect, the chronic WET effect used in permit limitations is "no significant <br />difference in toxicity between the control and any effluent concentration less than or equal to the <br />IWC ". <br />e) It should be verified that there is no background bromide in the receiving streams in the vicinity <br />of the Sunnyside mine. <br />We hope this addresses your concerns. Please note that this letter is by no means the extent of the <br />Division's analysis on these subjects. Please contact me with any questions. <br />Sincerely, <br />Patricia A. Nelson, P.E., Chief <br />Industrial Permits and Enforcement Unit <br />Permits and Enforcement Section <br />WATER QUALITY CONTROL DIVISION <br />cc- Jim Horn, Field Support Section <br />Local Health Department <br />MS -3 File <br />Richard Horstmann, Permits and Enforcement Section, WQCD <br />Amelia Whiting, Attorney General's Office <br />Allen Sorenson, Division of Minerals and Geology <br />David Holm, Water Quality Control Division <br />