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• Minimization of the area disturbed <br />• Collection and retention of runoff and backfill groundwater discharge from disturbed areas prior to <br />• release to receiving streams <br />• Proper design and construction of roads <br />• Periodic pumping of water accumulation in the pit to surface retention structures <br />• Contemporaneous reclamation <br />• Contour furrowing <br />• Localized erosion control practices <br />• Revegetation <br />Additional sediment control associated with Tipple 2 is found under Section 780.12, page 780-36, and Permit <br />Renewal Map ~. As previously noted, mining and reclamation activities were carefully planned and sequenced to <br />minimize the total area of disturbance at any point in time. Surface disturbance did not directly impact the stream <br />channel of any major area drainage. By minimizing the total area of disturbance, potential surface water impacts <br />were limited. <br />Mining at the Eckman Park Operation did not occur within the Floodplain areas of major drainages. Potential <br />.impacts to surface water quality and quantity result indirectly from effects of runoff from lands adjacent to the <br />major creeks and from groundwater discharges from backfilled areas. <br />Construction of sedimentation control structures is the principle method used to limit the amount of suspended <br />solids discharge to the receiving drainage. Sedimentation control structures allow monitoring and control of <br />discharges from the disturbed area. As described under Section 780.25, all sedimentation ponds which are used to <br />retain sediment from the Eckman Park Operation have been designed and sized in accordance with accepted <br />engineering practices. Tlie ponds are sized [o contain the runoff volume resulting from a 10-year, 24-Hour <br />precipitation event occurring over the contributing drainage area as well as a 3-year accumulation of sediment. <br />The sedimentation ponds incorporate an emergency spillway designed for the 100-year, 24-hour precipitation <br />event and anon-clogging, gated dissipating outlet <br />• <br />1996 Permit Ren. Permit Renewal 780-144-8 Revised 3/18/97 <br />