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During the permanent cessation phase of the operation the surface water monitoring will be <br />reduced. Monitoring of pond discharges will be done according to requirements of CDPS <br />permit number CO -048233. Monitoring on upper and lower North Thompson Creek will be <br />reduced to biannual quality monitoring in May and September according to the following <br />parameters: <br />Total Dissolved Solids Total Suspended Solids <br />pH Bicarbonate <br />Calcium Chloride <br />Iron Magnesium <br />Manganese Sodium <br />Sulfate Zinc <br />Copper (mine seepage only) <br />The discharge from the No. 1 Mine water treatment ponds (Outfall 001) will be sampled <br />and analyzed annually in June if the discharge flows into North Thompson Creek. June <br />1989 was the date of the first required sample. The sample will be analyzed for the same <br />parameters listed above for North Thompson Creek including an additional parameter <br />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 water was 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 />3-86 5/17 <br />