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PART R <br />Page No. 6 <br />Permit No. COG-850000 <br /> Limitations - Monitorin Sample <br />Parameter 30-Day 7-Day Daily Rationale Frequency 1 Type <br /> Avg. Avg. Max. <br /> <br />-------------- Federal Effluent Lim <br />----- itation Guid elines-------------- --------____________ <br />g~ <br />--------- <br />Total Suspended Solids, m <br />Re ort. <br />p <br />NA <br />Re ort <br />P <br />Federal ELG <br />Weekly <br />Grab <br />Total Iron, mg/1 <br />Existing Sources (before Report NA Report Federal ELG Weekly Grab <br />5/4/84) Report NA Report <br />New Sources (after 5/4/84) <br />Settleable Solids, ml/1 <br />Report <br />NA <br />Report <br />Federal ELG <br />Weekly <br />Grab <br />3. Effluent Limitations -Western Alkaline Coal Mining <br />a. Applicability <br />In addition to the requirements under Part LB.1 above, westem alkaline coal mines are subject to 40 CFR Part 434 <br />Subpart H. This subpart applies to alkaline mine drainage at western coal mining operations from reclamation areas, <br />brushing and grubbing areas, topsoil stockpiling areas, and regraded areas, where the discharge, before any treatment <br />has a pH equal to or greater than 6.0; has a dissolved iron concentration less than 10 mg/L; and has a net alkalinity <br />that is greater than zero. The effluent limitations in this subpart apply until the appropriate SMCRA authority has <br />authorized bond release. <br />1. Brushing and grubbing area means the area where woody plant materials that would interfere with soil salvage <br />operations have been removed or incorporated into the soil that is being salvaged. <br />2. Regraded area means the surface area of a coal mine that has been returned to required contour. <br />3. Topsoil stockpiling area means the area outside the mined-out area where topsoil is temporarily stored for use in <br />reclamation, including containment berms. <br />4. Reclamation area means an area that was previously disturbed as a part of the coal mining operation that is being <br />reclaimed. <br />b. Sediment Control Plan <br />The following items apply to those facilities, and specifically those areas, outlined under Part I.B.2.a above. <br />1. The operator must submit asite-specific Sediment Control Plan to the permitting authority that is designed to <br />prevent an increase in the average annual sediment yield from pre-mined, undisturbed conditions. The Sediment <br />Control Plan must be approved by the permitting authority and be incorporated into the permit as an effluent <br />limitation. The Sediment Control Plan must identify best management practices (BMPs) and also must describe <br />design specifications, construction specifications, maintenance schedules, criteria for inspection, as well as <br />expected performance and longevity of the best management practices. <br />2. Using watershed models, the operator must demonstrate that implementation of the Sediment Control Plan will <br />result in average annual sediment yields that will not be greater than the sediment yield levels from pre-mined, <br />undisturbed conditions. The operator must use the same watershed model that was, or will be, used to acquire the <br />SMCRA permit. <br />3. The operator must design, implement, and maintain BMPs in the manner specified in the Sediment Control Plan. <br />a. Sediment means undissolved organic and inorganic material transported or deposited by water. <br />b. Sediment yield means the sum of the soil losses from a surface minus deposition in macro-topographic <br />depressions, at the toe of the hillslope, along field boundaries, or in terraces and channels sculpted into the <br />hillslope. <br />• <br />