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§2.05 APPLICATION FOR PERMIT FOR SURFACE OR UNDERGROUND MINING <br />ACTIVITIES --MINIMUM REQUIREMENTS FOR OPERATION AND RECLAMATION <br />PLANS. <br />4.05.2 and if the disturbed surface drainage area within the <br />total disturbed surface area is small, the exemption may be <br />given. <br />The operator has one area at the train loadout area which falls <br />within the guidelines of Rule 4.05.2(3)(a)(b). This area is <br />described as follows: <br />Mine Silo Area Railroad Outslooe <br />This area consists of approximately 1.5 acres of revegetated <br />disturbance occupying outslopes of the railroad embankment <br />developed at the train loadout facility. This small area <br />exemption is depicted on Map 7. Flow from this area travels <br />through a grass filter established below the site. The grass <br />filter consists of the toe of outslopes of the railroad <br />embankment developed at the train loadout facility. The grass <br />filter consists primarily of Smooth Brome and is established on <br />the perimeter of an irrigated orchard. Cover in the grass filter <br />area is conservatively estimated at 50 percent. No mixing of <br />surface drainage and underground mine drainage occurs within <br />or results from this small area exemption. <br />SedCad® modeling utilized to describe this site predicts runoff <br />from the site will occur in compliance with the allowable <br />settleable solids concentration. The SedCad® modeling is <br />presented in Exhibit 8 Protection of the Hydrologic Balance, <br />pages SAE-26 through SAE-30. <br />i~ <br />TR-020 <br />2.05 - 39 <br />3/01 <br />