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~~ -5- ac-ft/ac disturbance). The Division found that the structures will still be capable of storing the required sediment, runoff, and mine water. Therefore no actual design modifications will be needed. The Division however, encourages CYCC to pursue a uniform sediment storage criteria either now of in the future. 8. The applicant's consultant states, within Exhibit B, that it is important to carefully control surface drainage within the vicinity of the modified highwall and spode slopes. The applicant has not provided sufficient detailed information ~ ijy3 regarding the surface drainage above the modified highwall. yw, '3 The applicant should provide additional detail to assure that ~%~ the highwall area will be properly drained in order to avoid '(~ ~~'~ infiltration of surface water which could affect the stability ~~~(J>~ `~ of the final h~ighwall. /c ~ 4''! ,yam I\. `~N 4,~ ~> L1 Ya. .,mat c~~.t~, d._,`. ~ ~ 0~- 71i~ ~, S~.uQ~~ o~ ,.e~ <. yl. Hvdtolocic BJalance: Ground Water (2.04.5. 2.06.7. ,i,,Y, /~y 2.05.3(4). 2.05.6(3). 4.05) ~-3 Hvdroloav Description - Ground Water Information 1. The applicant has listed the value of storage coefficient for the overburden aquifer to be 1.7 x 104 (p. 2.04.17, Vol. 1). Shouldn't this value be 1.7 x 10-4? The applicant should correct the typographic error. 2. The applicant should submit a revised map which shows the location of all monitoring wells to be used in the proposed ground water monitoring program. Currently. Map 9 does not show the location of the Fish Creek alluvial wells, well 001-5-10, and well 006-82-38. 3. Map 9 shows a "Dewaterinq Well" in the southeast cornet of Section 29. The applicant should provide a description regarding the proposed function of this well. It 1s assumed that this well is completed in the [eclaimed spoils aquifer and will be used to intercept spoils water before it teaches the proposed portal area. If this is the case, the applicant should provide an estimate of expected pumping rates, expected water quality, and a description of how the water will be handled and where discharge will occur. The probable hydrologic consequences of the discharge of this water should also be analyzed.