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• Blue Ribbon Mine - AHR Page 2 <br />• <br />• <br />GROUND WATER <br />The piezometers on the mine bench were monitored quarterly for <br />water level. Graphs are included with this report which show <br />historical water levels of the piezometers. <br />The water level in P-1 peaked in March which is typical and then <br />during the summer the water level dropped 12 feet to 17.6 feet in <br />September. <br />Piezometer P-2 showed a peak water level in March and then by <br />November it dropped 11.1 feet to a level consistent with prior <br />years records for this piezometer. <br />Piezometer P-3 showed water at 49.8 feet during March and for the <br />remainder of the year the piezometer was dry or nearly dry. <br />The piezometer at the top of the bench, P-4, showed little varia- <br />tion during the year. <br />The water level in P-5 averaged 10.7 feet deep during the year. <br />At the end of the year the water level in P-5 was 11.8 feet deep <br />measured from the bottom of the hole, (28.2 - 16.4). <br />Monitoring of piezometer P-6 was discontinued during the year <br />because it was destroyed by the 1993 bench cover material slump. <br />Both the north and south underdrains had less flow during 1994 <br />than 1993. The flow and mass average conductivity of the <br />underdrains for the last five years is summarized below. Flow is <br />presented in acre-feet. Conductivity is measured in umhos/cm. <br />.................. <br />': <br />NO. UNDERDRAIN <br />MID UNDERDRAIN <br />SO. UNDERDRAIN <br />Year Flow Cond Flow Cond Flow Cond <br />1990 0.0016 2300 0.000 0 0.010 4778 <br />1991 0.018 3034 0.000 0 0.020 4913 <br />1992 0.072 2916 0.000 0 0.034 3956 <br />1993 0.659 2615 0.048 1300 0.761 4451 <br />1994 0.010 2430 0.000 0 0.042 5076 <br />MINE WATER <br />The mine was sealed in 1966. No mine water inflow information <br />has been collected from the mine since it was sealed. <br />