Laserfiche WebLink
Section 780.21(b) Continued. <br />restoration •of the premining hydrologic balance. The scope and <br />analysis of the prediction of probable hydrologic consequences has <br />been limited by necessity to those effects which will likely be <br />observed and measureable in the on-going hydrologic monitoring <br />program proposed in Section 780.21 (b). <br />In summary, the potential effects of mining on ground water systems <br />in the mine plan and adjacent area will be (1) partial dewatering <br />of the coal aquifer; (2) temporary drawdown of water levels in the <br />adjacent area, (3) a temporarily increased postmining recharge <br />rate, (4) leaching of soluble lone in backfilled areas, and (5) <br />transport of accumulated dissolved salts through the coal aquifer <br />out of the mine plan area. Because no excavation or mining occurs <br />at the tipple there will be no effect upon any ground water systems <br />by operations at the Kerr Tipple Area. Probable consequences of <br />mining on surface water systems will be (1) increased runoff and <br />erosion within the mine plan area only during operations, (2) <br />increased sediment load in drainages within the mine plan area <br />during operations, (3) increased salt loading in streams draining <br />the mine plan area, and (4) a change in the ion balance of surface <br />water drainage in the mine plan and tipple areas. <br />Ground Water Effects <br />Dewatering <br />Data used to determine dewatering of the coal aquifer were ex- <br />tracted from Map 1, Kerr Mine Area Mine Plan, Hap 6, Kerr Mine Area <br />Geology, and Map 15, Kerr Mine Area Ground Water Hydrology. Moni- <br />tor well and pump test data presented in Section 780.15 were also <br />used. Equations and methods of analysis were taken from Lohman <br />(1972) and Walton (1962). <br />780-111 <br />