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4.05.2 and applicable State and Federal water quality standazds for receiving <br />streams, and also due to the fact that no mixing of surface drainage with a dischazge <br />from underground workings will occur. The small azeas to be exempted aze the <br />office area and two boneyard azeas. The three azeas comprise a total of 5.41 acres of <br />disturbance. (4.05.2(3)(b)(I)). <br />B. Diversions and Conveyance of Overland Flow <br />Drainage channels will be reestablished to their original natural pattern to minimize <br />erosion, to conserve soil moisture and promote vegetation. All postmine drainage <br />channels aze mulched and revegetated soon after topsoil placement as is practical <br />and the appropriate growing season occurs. <br />Seneca Coal Company has permitted one ephemeral stream channel reconstruction <br />on the reclaimed mine site; the Wolf Creek Fill Downdrain. The Wolf Creek Fill <br />diversion is permitted as arip-rapped trapezoidal channel with bottom width often <br />feet and 3hav side slopes. The downdrain was constructed in 1998 after the haul <br />road ramp is reclahmed and no longer needed. This diversion will divert surface <br />runoff away from the lower Wolf Creek Fill azea and is designed to convey the 100- <br />yeaz, 24-hour storm event. <br />A number of postmine drainage channels at the Seneca II mine are currently under <br />construction at the Seneca II Mine as part of the ongoing reclamation activities. <br />Designs for the reconstructed channels have been submitted and approved by the <br />Division in accordance with Rules 4.05.3 and 4.05.4. The postmine channel designs <br />were submitted through Technical Revision No. 32 to the permit application package <br />and subsequently approved in September, 1998. Postmining Drainage Control is <br />shown.on Exhihit 7-19 of the permit-application package. <br />Seneca Coal Company has permitted stock ponds at the Seneca II Mine. Stock <br />ponds have been constructed in drainages on reclaimed spoils in both the Wadge and <br />Wolf Creek mining azeas. The stock ponds aze temporary to assist in erosion <br />control, as well as provide water for wildlife and livestock. The stock ponds will <br />slow the peak runoff of precipitation events and help to minimize erosion in the <br />drainage channels. These small ponds will benefit both livestock grazing and <br />wildlife utilization of the reclaimed azea. Exhibit 7-7, Surface Hydrology Map, <br />depict the existing and proposed stock tanks. <br />SCC submitted Technical Revision No. 35 in February, 2002 to submit as-built <br />drawings and certifications for stock ponds and to request that several of these <br />structures remain as permanent features. Twenty-five stock ponds have been <br />constructed to date. SCC has reclaimed two of these stock ponds and proposes to <br />retain twelve of the stock ponds as permanent features. If approved through TR-35, <br />twelve stock ponds would be retained as permanent structures. Because there aze <br />outstanding adequacy issues, the proposed decision deadline for TR-35 has been <br />14 <br />