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During the permanent cessation phase of the operation the surface <br />water monitoring will be reduced. Monitoring on mine discharges <br />and pond discharges will be done according to requirements of CDPS <br />permit no. CO-0029599. Monitoring on upper and lower North <br />Thompson Creek will be reduced to biannual quality monitoring <br />according to the following parameters: <br />Total Dissolved Solids <br />pH <br />dCalcium <br />v Iron <br />v Manganese <br />Sulfate <br />Copper (mine <br />seepage only) <br />'Total Suspended Solids <br />Bicarbonate <br />/Chloride <br />~ Magnesium <br />/Sodium <br />u Zinc <br />The discharge from the No. 1 Mine seepage water treatment ponds <br />will be sampled and analyzed annually in June. June 1989 was the <br />date of the first required sample. The sample will be analyzed for <br />the same parameters listed above for North Thompson Creek including <br />on additional parameter which is copper. <br />The flumes on North and Middle Thompson Creek were removed in the <br />summer of 1986 and flow measurements have been discontinued. All <br />other monitoring on Middle Thompson Creek will be discontinued. <br />Monitoring on the Roaring Fork River was discontinued in previous <br />revisions the permit. <br />3.6.1.4 Alternative Water Supply <br />The only known use of ground water within the permit area and <br />adjacent areas was by the North Thompson Creek Mine. The mine's <br />water supply was provided by water pumped from the underground <br />workings. This water was appropriated under rights purchased from <br />Anschutz Corporation. The mining operation did not divert or use <br />the surface water from North Thompson Creek. <br />The North Thompson Creek Mine filled during 1988. Since that time, <br />all of the water that flows into the mine, flows out and is passed <br />through treatment ponds. This water is discharged back into North <br />Thompson Creek or contained in on site ponds during most of the <br />year. Seasonally from April through November, a small amount of <br />this water, (10 gpm +/-), is pumped upslope for use for agriculture <br />and stock watering. <br />The only consumptive use of the mine water is storage and seasonal <br />use. At any time this use could be curtailed. Therefore if there <br />were a "call" on North Thompson Creek, all of the mine water would <br />be returned to the creek through the treatment ponds. Since there <br />is no ongoing need for the mine water, no alternative water supply <br />is necessary. <br />3-86 Rev. 6-10-932 <br />i <br />