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EFFLUENT MONITORING 1 A large number of sedimentation control structures at Mine 1 and Mine 2 are monitored. Of these, only Stations 39, 57, 84 and 87 at Mine 1 and no stations at Mine 2 had significant flows in the Water Year 1987. One of the ' sites at Mine 2 has had occasional discharges in recent years while a few of the other sites at both areas have discharged infrequently during the period of record. Most of the Mine 1 ponds are in the Foidel Creek drainage, only Pond H (Site 57) is in the Middle Creek drainage. All of the Mine 2 ponds ' are in the Fish Creek drainage. Ponds D (Site 84) and G (Site 55) at Mine 1 are effected by the underground operations. Pond D receives inflow from the underground mine discharge water and the waste rock disposal area as well as runoff from the surface mine. Pond G receives runoff from the surface facilities of the underground and surface mine. Flows The flow rate data for the effluent stations is summarized on Table 52. The historic discharge data for the ponds with significant 1987 water discharges at Mine 1 are presented in figures 42 and 44. Discharges from these ponds are effected by the mining activities, seasonal variations, and spoil springs. All of the plots show the typical seasonal variation with high flows during spring runoff. Flistorically, discharges from the ponds ceased in the summer and did not begin again until the next spring. Three ponds, A (Site 39), D (Site 84) and F (Site 87), began discharging year-round in late ' 1984. This is due to the spoil springs located 1n the drainages of Ponds A and F and the underground mine discharge to Pond D. Pond A now has a base ' flow of approximately 1.4 cfs, Pond D 0.23~f~ and Pond F 0.1 cfs. These flows have changed Foidel Creek from a annual to a perennial stream. Peak discharges from the ponds do not seem ve changed significantly because ' the spoil spring water would have discharged as snowmelt runoff anyway. CJ - 10 - 1