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Runoff from the disturbed area will flow through the designed <br />• collection ditch to a sediment fence located at the west end of the <br />ditch as shown on Map 30, Drainage and Sediment Map. All drainage <br />structures are designed to safely pass the peak discharge from a 10- <br />year, 24-hour event. Design calculations can be found in Appendix <br />C, Hydrologic Documentation. Given the Explosives Bunker location, <br />there is little potential for mixing of surface drainage from this <br />site with mine water discharge or other surface runoff. EFCI <br />recognizes the potential for erosion associated with County Road 92, <br />which provides access to both the Newlin Creek Mine and ties to the <br />Explosives Bunker access road. EFCI is working with both the County <br />and surface land owner to address this concern through ongoing <br />maintenance consistent with applicable regulatory drainage control <br />provision for light-use roads. <br />Given that the Explosives Bunker area, in its current configuration, <br />with runon and runoff diversions and sediment fence, is compatible <br />with the exemption criteria of Rule 4.05.2(3), EFCI respectfully <br />• requests MLRD approval of a Small Area Exemption for this facility. <br />C~ <br />C:\B60TR-21.RESP <br />o~/zb/9s 3:34pm kep 206a R@vised - July 1995 <br />