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<br />9. <br />5. HYDROGEOLOGY <br />' 5.1 SIMULATION OF INFLOWS TO THE ACTIVE PIT <br />' Using aquifer data and active pit configuration measurements, <br />inflows to the pit were simulated for several cases using the <br />' computer model described in section 4.3. Model drawdowns and <br />aquifer boundary conditions were required to be representative <br />' of actual drawdowns in the current active pit area. Drawdown of <br />the water table in the pit averages about 33 feet below the <br />' estimated mated original groundwater surface and pit inflow is <br />estimated at about 10 gpm. For the most representative case, a <br />recharge boundary was assumed to the west, with all other direc- <br />t tions considered continuous (See plate 3). Mining in this pit <br />has proceeded to approximately 30 feet below the projected sur- <br />' face of Stollsteimer Creek. <br />' The value for transmissivity that represents the best approxima- <br />tion to the actual field situation was determined to be 320 <br />' gpd/ft with inflow to the pit calculated at 10 gpm. Input <br />values and output from the program are given in Table 3 and Fig. <br />3, respectively. <br />5.2 PROJECTED GROUNDWATER INFLOWS TO THE PROPOSED BARREN~RIDGE PIT <br />' Information provided by CMCC indicates that the mine progression <br />' will not proceed below the projected potentiometric surface of <br />Stollsteimer Creek. Therefore, the groundwater inflow to a pit <br />' located along the Barren Ridge will only result from infiltra- <br />tion of precipitation to the local surface area. <br />' Two methods for the determination of inflow were utilized. The <br />first method uses aquifer parameters determined from the aquifer <br />1 <br />1 <br />D A PD EAUd •SSOCU 1E5 U4i~ED <br />