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GRAND MESA COAL COMPANY <br /> 1989 ANNUAL HYDROLOGIC REPORT <br /> PAGE 2 <br /> year because the quality of the springs may be impacted by water <br /> which may seep into the alluvium from the old mine workings . <br /> During September the conductivity of the two springs was measured <br /> and compared to similar measurements taken during the time period <br /> from 1982 to 1984 . Both springs had a conductivity which was <br /> less than their respective historic average. <br /> The sediment pond did not discharge during the year. By mid <br /> year the bottom of sediment pond completely dried out for the <br /> first time ever. <br /> GROUND WATER <br /> Table G-89 shows the ground water monitoring results for this <br /> water year compared to the averages of previous monitoring <br /> results for the same months . <br /> The coal seam piezometer water levels were generally higher than <br /> the average water levels this year as they were last year. This <br /> may show a delayed response to higher than normal run-off for the <br /> past several years . The water levels in each of the coal seam <br /> piezometers did decrease this year. <br /> • The water levels in the refuse pile piezometers all showed a <br /> slight decrease during the year probably as a result of the <br /> refuse pile being reclaimed during 1988 . There were no springs <br /> flowing out of the refuse pile . The ground around refuse pile <br /> piezometer P-6 settled slightly which put a kink in the PVC pipe. <br /> Water level measurements could still be taken for P-6 but grab <br /> samples could not . Since the revised hydrologic monitoring <br /> program does not include the refuse pile piezometers , P-6 was <br /> not repaired. <br /> The alluvial piezometers showed water levels both higher and <br /> lower than average during the year. The water levels were about <br /> 3-feet lower than average during July when the sediment pond was <br /> completely dry. <br /> MINE WATER <br /> The underground workings were not accessible for mine inflow <br /> monitoring in 1989 nor will they be accessible in the future. <br /> The water level in the mine is projected to stabilize below the <br /> portal according to the Kaman Tempo Report, Volume 8 of 8 of the <br /> permit application . For a projection of the mine filling <br /> schedule , please refer to the 1987 Annual Hydrologic Report. <br /> CONSUMPTIVE USE <br /> None . <br />