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<br />TR-66 2.05 - 40 09/24 <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 /> <br />The operator has two small area exemptions at the train <br />loadout area which falls within the guidelines of Rule <br />4.05.2(3)(a)(b). These areas are described as follows: <br /> <br />Mine Silo Area Railroad Outslope <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 /> <br />SedCad7 modeling utilized to describe this site predicts runoff <br />from the site will occur in compliance with the allowable <br />settleable solids concentration. The SedCad7 modeling is <br />presented in Exhibit 8 Protection of the Hydrologic Balance, <br />pages SAE-26 through SAE-44. <br /> <br />Farmers Ditch Small Area Exemption <br />This area consists of approximately 0.8 acres of reclaimed <br />surface, including the reclaimed sediment pond. The runoff will <br />be directed to and filtered through a silt fence or straw wattle as <br />shown on Map-7. SedCad pages are included as SAE-1 though <br />SAE-9 (Tab 8) and demonstrate the small area exemption will <br />be in compliance with the allowable settleable solids <br />concentration. <br />