Laserfiche WebLink
<br /> <br />1990 ANNUAL HYDROLOGIC REPORT <br />PAGE 2 <br /> <br />According to the local irrigation office many of the area <br />springs have dried up during the preceding three years. The <br />flows in Springs 1 & 3 this year were lower than average which is <br />to be expected. The revised hydrologic monitoring program ex- <br />pands the sampling of springs 1 & 3 to flow and conductivity <br />twice each year because the quality of the springs may be im- <br />pacted by water which may seep into the alluvium from the old <br />mine workings. Both springs had a conductivity which was rela- <br />tively close to their respective historic averages. The conduc- <br />tivity of the springs will probably .show some increase in the fu- <br />ture if the flows in the springs continue to decrease. <br />The revised hydrologic monitoring program provides for addi- <br />tional monitoring to determine if run-off from the mine site has <br />any impact on the water quality in the Carbon Ditch. SP-D is the <br />upstream monitoring point and SP-DA is the new downstream <br />monitoring point on the Carbon Ditch. SP-D is located on the <br />Carbon Ditch at a point that would not be impacted by surface <br />run-off from the mine site. SP-DA is located downstream on the <br />• Carbon Ditch at a point that could be impacted by surface run-off <br />from the mine site. Both points are monitored during May and <br />September for field parameters and total suspended solids, (TSS). <br />During May there was flow in the Carbon Ditch. The monitoring <br />results did not show any degradation of quality from SP-D to SP- <br />DA. There was no flow in the Carbon Ditch on the day the sam- <br />pling was performed in September. <br />The sediment pond did not discharge during the year. It did <br />not have any water in it at all during the year. <br />GROUND WATER <br />Table G-90 shows the ground water monitoring results for <br />this water year compared to the averages of previous monitoring <br />results for the same months. The alluvial piezometers near the <br />sediment pond are the only ground water that is currently being <br />monitored. <br />The alluvial piezometers showed water levels consistently <br />lower than average during the year. The water depths were <br />greater than have ever been measured which reflects the dry con- <br />ditions in the area and the lack of run-off reaching the sediment <br />pond. <br />• <br />