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• During the permanent cessation phase of the operation the surface water monitoring will be <br />reduced. Monitoring on mine discharges and pond discharges will be done according to <br />requirements of CDPS permit number CO- 048233 Monitoring on upper and lower North <br />Thompson Creek will be reduced to biannual quality monitoring in May and September <br />according to the following parameters: <br />-Total Dissolved Solids <br />-pH <br />- Calcium <br />Iron <br />- Manganese <br />- Sulfate <br />_Total Suspended Solids <br />Bicarbonate <br />_ Chloride <br />Magnesium <br />- Sodium <br />Zinc <br />- Copper (mine seepage only) <br />The discharge from the No. 1 Mine seepage water treatment ponds will be sampled and <br />analyzed annually in June. June 1989 was the date of the first required sample. The <br />sample will be analyzed for the same parameters listed above for North Thompson Creek <br />-- including 2n additional parameter which is copper. <br />The flumes on North and Middle Thompson Creek were removed in the summer of 1986 <br />and flow measurements have been discontinued. All other monitoring on Middle <br />• Thompson Creek will be discontinued. Monitoring on the Roaring Fork River was <br />discontinued in previous revisions the permit. <br />3.6.1.4 Alternative Water Supply <br />The only known use of ground water within the permit area and adjacent areas was by the <br />North Thompson Creek Mine. The mine's water supply was provided by water pumped <br />from the underground workings. This waterwas appropriated under rights purchased from <br />Anschutz Corporation. The mining operation did not divert or use the surface water from <br />North Thompson Creek. <br />The North Thompson Creek Mine filled during 1988. Since that time, all of the water that <br />flows into the mine, flows out and is passed through treatment ponds. This water is <br />discharged back into North Thompson Creek or contained in on site ponds during most of <br />the year. Seasonally from April through November, a small amount of this water, (10 gpm <br />+ / -), is pumped upslope for use for agriculture and stock watering. <br />The only consumptive use of the mine water is storage and seasonal use. At any time this <br />use could be curtailed. Therefore if there were a "call" on North Thompson Creek, all of <br />the mine water would be returned to the creek through the treatment ponds. Since there is <br />no ongoing need for the mine water, no alternative water supply is necessary. <br />n <br />\J <br />3 -86 3/10 <br />