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1 <br />' 3.0 HYDROLOGY AND MINE DEVELOPMENT <br />' This monitoring period from October 1, 1995 to September 30, 1996 has provided the hydrologic <br />information necessary to assess the adequacy of monitoring program, the adequacy of the <br />mitigative measures designed to protect the hydrology, and identify and quantify impacts that may <br />' have occurred during this period. <br />' 3.1 Mlning Related Hydrologlc Impacts <br />The only impacts identified to date include: <br />• Withdrawal of water for the mine from the lagoon adjacent to the White River thus <br />reducing the flow in the White River. WFU has legal right to this water. <br />t • Discharge of mine water into Red Wash, a White River tributary. <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 levels in monitor holes at the 2-7, 35-4 and 36-2 locations <br />due to very nearby mining, although an increase in the water level at 35-4 and 36- <br />2 was noted this 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 quickly <br />' fill with clay and silt with Red Wash maintaining its original channel. <br />3.2 Comparison of Projected Impacts YVlth Observed Impacts <br />' The comparisons of the projected impacts (probable hydrologic consequences) with the observed <br />' impacts are discussed in the following. <br />The water withdrawal rate from the lagoon in the White River Alluvium this reporting year (October <br />' 1,1995 to September 30, 1996) was estimated at 68,983,044 gallons (199,4 acre-feet) acre-feet. <br />This compares with an expected withdrawal rate of 598 acre-feet per year at full production. <br />' Clean ccal production during this reporting period was 214,845 tons in addition to 230,313 tons <br />of bypassed (not cleaned but shipped) tons compared to projected full production of 1.3 million <br />tons per year. <br />' 18 <br />