Laserfiche WebLink
GROUND MATER <br />•The water level monitoring on the Rapid Creek and Cottonwood Creek piezometers <br />was reduced to a monthly schedule through the summer and fall. The results of <br />monitoring for the 1987 season are shown on data page GA-1. The piezometers <br />on lower Rapid Creek, GWMS-OlA and 016, and on upper Rapid Creek, GWMS-03A and <br />03B, show a typical seasonal variation with high levels in the early summer and <br />low levels in the late summer. The relative water levels on these piezometers <br />remained uniform during the year. The Cottonwood Creek piezometers GWMS-02A <br />which is developed in the lower portion of the alluvial material showed little <br />variation while -02B which is developed in the entire alluvial interval showed <br />a large variation. The water levels in the Rapid Creek and Cottonwood Creek <br />piezometers were generally lower than in 1986 corresponding to lower surface <br />water flows in 1987. <br />The monitoring on the Cameo refuse disposal area piezometers was done quarterly. <br />The following is a listing of average water levels in these piezometers for the <br />past 4 years: <br />Hater Year CRDA-O1 Elev. CRDA-02 Elev. CRDA-03 Elev. <br />1984 13.6 4866.4 26.6 4854.8 21.0 4863.3 <br />1985 14.9 4865:2 28.4 9853.0 23.8 48b0.5 <br />1986 15.1 4864.9 27.0 4854.4 21.1 4863.2 <br />1987 16.1 4863.9 25.8 4855.6 20.4 4863.9 <br />The water level in CRDA-O1 continued to decrease and the water levels in CRDA-02 <br />and 03 continued to increase. A slight seasonal variation was noted in all three <br />piezometers. <br />The piezometers at the unit train loadout, UTL-O1 thru 04, showed a seasonal <br />change. As shown on the following table, the average water levels on all 4 points <br />were the lowest since monitoring began. <br />Mater Year UTL-O1 UTL-02 UTL-03 UTL-04 <br />1984 7.5 7.0 4.9 3.5 <br />1985 7.9 7.8 6.2 3.5 <br />1986 7.9 6.5 4.8 3.6 <br />1987 10.3 8.5 7.3 4.8 <br />The UTL piezometers are believed to be closely related to the Colorado River <br />Water level. The Colorado River reached lower levels in 1987 than in the past <br />few years. <br />MINE MATER <br />The mine inflows studies for this year's report were done in October and November <br />1987. The schedule for the annual mine inflows studies will be changed to <br />September for future reporting. Tables M87-1 and 2 are a summary of locations <br />monitored, flows and field measurements. The location numbers correspond to <br />monitoring locations shown on the 1987 Mine Inflows Map. <br /> <br />- 3 - <br />