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~~ <br />1 <br />3.0 HYDROLOGY AND MINE DEVELOPMENT <br />' This monitoring period from October 1, 1997 to September 30, 1998 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 />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 />' Di <br />f <br />f <br />h <br />t <br />d <br />1 <br />RP2/3 <br />d RP4 i <br />t <br />R <br />d W <br />h <br />t <br />SS <br />d <br /> rom pon <br />sc <br />arge o <br />s <br />orm wa <br />er <br />s <br />, <br />an <br />n <br />o <br />as <br />an <br />- <br />e <br /> DP-1 into Scullion Gulch, White River tributaries. <br /> <br /> • Decline in piezometric level in upper sandstone facies at 2-12U as the result of <br />t subsidence above longwall panel #1. This hole has been mined out. <br /> • Decline in piezometric levels in monitor holes at the 2-7, 35~ and 36-2 locations <br />' due to very nearby mining, although an increase in the water level at 36-2 was <br /> noted this monitoring period. <br /> • D <br />li <br />i <br />i <br />i <br />l <br />l i <br />"l <br />d <br />f <br />" <br />h <br />l <br />f l <br /> ec <br />ne <br />ezometr <br />n p <br />c <br />eve <br />n <br />ower san <br />stone <br />acies <br />as t <br />t o <br />e resu <br />eaking <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 />' 3.2 Comparison of Projected Impacts With Observed Impacts <br />' The comparisons of the projected impacts (probable hydrologic consequences) with the <br />observed impacts are discussed in the following. <br />' The water withdrawal rate from the lagoon in the White River Alluvium this reporting year <br />(October 1, 1997 to September 30, 1998) was estimated at 142,258,045 gallons or 436.6 <br />ie <br />1 <br />