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<br /> <br /> <br /> <br /> <br />I 1 <br />I 1 <br />I 1 <br />i~ <br />i~ <br />~' <br />~l <br />1 <br />1 <br />1 <br />1 <br />EFFLUENT MONITORING <br />The direct mine inflow, and discharges aze discussed in the preceding section. In addition to <br />the direct discharges there are other effluent sites associated with the operation. The <br />underground discharge mixes with water from the adjacent surface mine and then discharges <br />through a point permitted by CYCC. The two sites associated with the underground operations <br />on Foidel Creek are: 1) Site 7, the discharge point from the Waste Rock disposal pond, and <br />2) Site 84 (NPDES Site 005, Permit No. CO-0027154), the discharge point for Pond D which <br />receives the discharge from the waste rock pond and the underground mine. During 1989 Site <br />7 did not discharge. The outflow from the Fish Creek Tipple Sediment Pond (Pond E) is also <br />monitored at Site 62 (Site 001, NPDES Permit CO-0036684). <br />Flows <br />The Historic discharge date for Pond D is presented on Figures 43 and 44. Discharges from <br />this site are effected by the mining activities and by seasonal variations. Prior to the <br />construction of the underground mine Pond D did not discharge continuously. Since the opening <br />of the underground mine the Pond has discharged almost continuously. This is because of <br />discharges of water from the underground mine and bemuse of past discharges of water from <br />the waste rock site (Area 2 Pit). The amount of waste rock disposed of in the site in 1990 was <br />38,500 tons (Table 54). The level of the waste rock pond was pumped down in early 1986 and <br />the pond has discharged only once since January, 1986. That was in May, 1988. The discharge <br />from Pond D was almost wholly from discharge from the underground mine in 1989. <br />The historic discharge from Pond E is plotted on Figure 49. It exhibits the same seasonal <br />pattern as the streams. The magnitude of the discharge was less than 53'0 of the stream flow <br />during the 1980 irrigation season. <br />12- <br />