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100-ton roak dust storage tank, 300 feet of overhead powerline, aryl a small amg3ressor aryl associated control systems for material transfer. The pad area is graded so that all drainage from the pad is either retained on the pad or diverted by a containment been located along the east edge of the pad to a e~;e,orif- fence located at the end of the berm. The cxlimant fence is designed to safely pass all runoff frrxn a 10-year, 24-hour event. In addition, a berm on the west side of the pad prevents any undisturbed area ninon. The disturbance area for the rock dust storage facility is small, totalling only 0.22 acres. Drainage is effectively controlled by the gravel surfacing aryl the ccx9imant fence, preventing any adverse impacts on downstream water rn,a~ ity. ZYre subject area is approximately 400 feet above the related w~derground mine workings and there is no mine water discharge or associated potential for mixing with surface runoff. Given • these factors, the rock dust storage facility is congaatible with the exemption criteria of Rule 4.05.2(3). EFCI will ccumait to ongoing maintenance of the sedimnt fence during active operations, including inspections and repair of any damage and periodic sediment removal. In ogler to confirm the previous it~licit approval, EFCZ respectfully requests that the CSII.RD issue a specific Small Area Exemption approval for the rock dust storage facility. EAST lDADOiTP AREA - F13RMER TR[JCK 20R[~iJNU In response to a Notice of Violation relating to drainage design concerns, EFCI reviewed existing drainage structures and related designs for the Fast Loadout Area. 'This review resulted in a decision to simplify drainage systems in the area south of the railroad tracks to separate disturbed and undisturbed area drainage. • The only mining related disturbance in the southern portion of the Fast loadout Area is the existing topsoil stockpile and a closed depression. C \...860\TR1fi .REV n/o6/s3 lpm 203R Revised -November 1993