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<br />' EFFLOENT MONITORING <br />1 Two sediment control structures M3-S (Station 76) and M3-N (Station <br />24) are monitored at Mine 3. Pond M3-N (Station 24) is located at <br />the reclaimed area immediately north of the confluence of Foidel <br />Creek and Middle Creek and controls runoff from reclaimed areas <br />from the abandoned Middle Creek underground mine. Pond M3-S <br />(Station 76) is located south of the confluence and east of Middle <br />Creek and controls runoff from reclaimed areas east of Middle <br />Creek. <br />Flown <br />The flow rate data for the effluent sites are provided in the <br />tables attached to the report. Maximum 1991 flow rates are <br />compared with historic maximum flows in Table 14. Discharge from <br />these ponds is low and infrequent. Maximum discharge in 1991 was <br />0.086 cfs at Station 24 and 0.09 cfs at Station 76. Discharges <br />from these two ponds occur only as a result of large precipitation <br />events. Only five discharge events were detected at Station 24 <br />during 1991 and only four discharge events were detected at Station <br />76 in 1991. All the 1991 discharge events occurred during spring <br />runoff. <br />1 <br />1 <br /> <br />t <br /> <br /> <br /> <br /> <br /> <br />Water Quality <br />The water quality data for 1991 for the two effluent sites are <br />provided in the tables attached to the report. Specific <br />conductance plots are also included on Figure 21. Record summaries <br />included on Tables 21 through 24 shows that the discharge from <br />these sites did not contain constituents that would have a <br />detrimental effect on the water quality in Middle Creek. Neither <br />site is exhibiting any long term trends in specific conductance. <br />- 8 - <br /> <br />