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• GRAND MESA COAL COMPANY <br />1988 ANNUAL HYDROLOGIC REPORT <br />HYDROLOGIC YEAR 10/87 - 9/88 <br />During the 1988 hydrologic year, Grand Mesa Coal Company <br />reclaimed its Red Canyon mine site. The entire site was con- <br />toured, seeded and mulched in accordance with the approved <br />reclamation plan. The on site monitoring points were all <br />preserved. T7ao of the refuse piezometers were extended. <br />This year's report is formatted the same as the 1987 report. <br />Monitoring values are compared with the average of previous <br />values for the same month. The averages generally include <br />monitoring results from 1981 through 1987. The averages shown in <br />this report are slightly different from last year's report be- <br />cause the 1987 values are included in the averages. <br />SURFACE WATER <br />Table 5-88 shocas the surface water monitoring results for this <br />water year compared to the averages of previous monitoring <br />results for the same month. <br />• According to the local irrigation office, 1988 was a below <br />average year for run-off. Although spot flow readings taken in <br />May can vary because of the timing and intensity of snowmelt, the <br />May readings on Ward Creek, Williams Creek and SP-D sll show very <br />low flows compared to the prior averages for May. The September <br />measurements are a good indication of how the irrigation season <br />went. The late season flows on the creeks are augmented by <br />reservoir discharge. Low flows in the fall indicate that the <br />reservoir water is near depletion. The measured flows in Septem- <br />ber in sll but Williams Creek show lower than average flows. The <br />conductivity in the creeks is generally related to the flow: the <br />lower the flow the higher the conductivity except during periods <br />of very high flow when the conductivity will be high because of <br />turbid water. In general all of the creeks showed low flow and <br />high conductivity in both May and September. <br />The flow in springs this year was generally lower than the <br />average. Flow in all of these springs is related to the amount <br />of water being used for irrigation. <br />The sediment pond did not discharge during the year. Previous <br />discharges were related to mine discharge. There were at least <br />two precipitation events during 1988 that contributed water to <br />the sediment pond, however neither produced enough water to fill <br />the pond above the level of the sediment pond's primary spillway. <br /> <br />I <br />