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Red Canyon 1991 AHR Review <br />Page 4 <br />This is currently the only ground water monitoring that is <br />done. These piezometers are about 19 feet deep and are <br />completed into alluvium. Water levels for the piezometers <br />since 1983, are included on Table 4. There is a consistent <br />downward trend except for the spike during April 1989 and an <br />upward trend which begins in January 1991. However, the 1991 <br />Water Year data is still lower than the average water level. <br />The AHR states that the low water levels reflects the dry <br />conditions in the area and the lack of run-off reaching the <br />sediment pond. This explanation is acceptable. During <br />Division inspections, it has been noted that there is water in <br />the pond but is probably due to direct rainfall or snowfall. <br />Impact: There appears to <br />piezometers that <br />operation. <br />be no impact on the alluvial <br />could be attributed to the mine <br />Miscellaneous Comments <br />Table G lists all the piezometers on site, the outer diameter of <br />the pipe, the top elevation at the top of the casing, the ground <br />elevation, and the bottom elevation of the well. The table below <br />refers to the refuse piezometers. Because of additional refuse and <br />when the pile was reclaimed, more material was added and the top of <br />the casing had to be raised. The cumulative change in elevation <br />must be added to previous water levels in order to get the correct <br />level. <br />RCAHR <br />