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§2. OS APPLICATION FOR PERMIT FOR SURFACE OR UNDERGROUND MINING ACTIVITIES -- MINIMUM REQUIREMENTS FOR OPERATION AND RECLAMATION PLANS. 2.05.6 Mitigation of Surface Coal Mining Operation Impacts. (Cont'd.) (3) (b) (ii) (A & B) (Cont'd.) Trailer location (see Volume 8, Map No. 8-2, and Volume 8, pages SAE-21 thru SAE-25). Flow from the site is filtered through the naturally occurring vegetative filter below the site. The vegetative filter area is undisturbed, consists primarily of dense oak brush with a grass understory, and has accumulated a thick, nearly continuous layer of litter and detritis. Cover in the vegetative filter area is conservatively estimated at 70~. No mixing of surface drainage and underground mine drainage occurs within or results from this small area exemption. The Sedcad modeling utilized to describe this site predicts runoff from the site will occur in compliance with the allowable settleable solids concentration. (5) (6) Bowie No. 1 Mine Fan level - consisting of approximately 2.8 acres of disturbance previously approved as a small area exemption (see Volume 8, Map No. 8-lA) The operator agrees to provide an analytical demonstration that the area does not contribute non-compliant sediment loads to the surrounding drainages. This demonstration will entail the installation of silt fences in appropriate locations below the area of disturbance and the subsequent sampling of runoff events. The silt fences will be examined periodically and maintained to ensure adequate function at all times. Samples will be analyzed for compliance with the NPDES settleable solids standard when measurable runoff occurs at designated sampling points in response to precipitation events of less than 10-year, 24-hour magnitude. No mixing of surface drainage and underground mine drainage occurs within or results from this small area exemption. ()12-1o S Revised 11/20/92 /j?P2oVaD Revised 9/21/01 G/2y/o `1 113b