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' EFFLUENT MONITORING <br />The Foidel Creek Mine has no direct discharges. All of the underground discharges <br />mix with water from the adjacent surface mine and then discharge through a point <br />permitted by CYCC. The three effluent sites associated with the underground <br />operations are: 1) Site 7, the discharge point from the Waste Rock disposal pond, <br />2) Site 84 (NPDES Site 005, Permit N0. CO-027154), the discharge point for Pond D <br />which receives the discharge from the waste rock pond and the underground mine, <br />and 3) Site 83, the surface runoff inflow site to Pond D. <br />' Flows <br />' The historic discharge data for Pond D is presented in Figure 34. Discharges from <br />this site are effected by the mining activities and by seasonal variations. Prior <br />' to the construction of the underground mine Pond D did not discharge <br /> continuously. Since the opening of the mine the Pond has discharged almost <br /> continuously. This i s bec ause of discharges of water from the underground mine <br /> and because of the d ischarge of water from the waste rock site (Area 2 Pit). <br /> During late 1985 and early 1986 a large quantity of water was pumped out of the <br /> waste rock disposal site to accommodate backfilling and grading operations <br /> conducted by CYCC. This significantly increased the discharge through Site 7 <br />' (Figure 35) and out of Pond D. The amount of waste rock disposed of in the site <br />in 1986 was 1693 yards (Table 46). The level of the waste rock pond was pumped <br />' down at the end of this period and the pond has not discharged since January, <br />1986. It is expected to refill during the spring of 1987. <br />' Water Quality <br />1 <br /> <br />1 <br /> <br /> <br />Summaries of the water quality data for Sites 83 and 84 are presented on Tables 47 <br />to 50 and on Figures 36 to 39. The dissolved solids data shows some typical <br />seasonal variation: the water quality improves during spring runoff. The <br />discharge also shows the effects of the waste rock site: the dissolved solids <br />levels dropped after the discharge from the waste rock pond stopped in <br />~~. ~I .o <br />"~J ~°',IS s~'~r~ <br /> <br />