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<br /> <br />3.0 HYDROLOGY AND MINE DEVELOPMENT <br />1 <br /> <br />This monitoring period from October 1, 1998 to September 30, 1999 has provided the <br />hydrologic information necessary to assess the adequacy of monitoring program, the adequacy <br />of the mitigative measures designed to protect the hydrology, and identify and quantify impacts <br />that may have occurred during this period. <br />' 3.1 Mining Related Hydrologic Impacts <br />t The only impacts identified to date include: <br />' Withdrawal of water for the mine from the lagoon adjacent to the White River <br />thus reducing the flow in the White River. BME has legal right to this water. <br />• Discharge of storm water from ponds SS-1, RP2/3 and RP4 into Red Wash and <br />DP-1 into Scullion Gulch, White River tributaries. <br />• Decline in piezometric level in wells TW-2-7, 2-7 and 35-4. These holes <br />' remained dry. <br />• Decline in piezometric level in upper sandstone facies at 2-12U as the result of <br />' subsidence above longwall panel #1. This hole has been mined out. <br />' • Decline in piezometric level in well 4-20. <br />• Decline in piezometric levels in monitor hole 36-2 location due to very nearby <br />mining, although an increase in the water level at 36-2 was noted in 1997-1998 <br />monitoring period. <br />• Decline in piezometric level in "lower sandstone facies" as the result of leaking <br />exploration holes (drilled in 1978) that were intercepted by mining, and possible <br />' effects of longwall mining. <br />' Subsidence in Red Wash resulting in ponding of surface water. The ponds <br />quickly fill with clay and silt with Red Wash maintaining its original channel. <br />1 <br />1 <br />16 <br /> <br />