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10. Name Location Design flab 13l (As-Builti • Sedimentation Strudure 005 North II-W Attachment 1 &3 Sedimentation Strudure 006 (Phase II) it-W Attachment 134 Sedimentation Strudure 0(16 and Pre- II-W Attachment 134C u • Settling basin (Phase I~ Sedimentation Structure 006 (Phase h II-W Attachment 13.tE Sedimentation Strudure 009 North II-W Attachment 1&5 Sedimentation Strudure 015 II-W South Attachment 13-56 Sedimentation Strudure 016 fl-W South Attachment 13-56 Sedimentation Strudure 017 II-W South Attachment 1&56 Stock Tanks Seneca Coal Company (SCC) construds temporary stock tanks in the reclaim areas at the Seneca operations. These small tanks wiN benefit both livestock grazing and wildlrfe utilization and will enhance the interim and final postmining land use of the reclaimed areas. The stock tanks slow the peak runoff from precpitation events and snowmeN and help to minimize erosion in the reclaimed area. Design and Construction. The stock tanks are small structures to enhance the postmine livestock and wildlife utilization. The capacity of the tanks are less than two acre-feet and the vertical height of the embankments is five feet or less, as measured from the upstream toe to the bottom of the emergency spilhxay. The drainage area for each tank is large enough fo maintain an adequate supply of water into the tank. All stalk tank locations are in drainage that are normally dry. All permanent and temporary stock tanks will meet the design criteria specified in Rule 4.05.9. All impoundments intended for retention as permanent postmining features shat) comply with applicable state engineer rules and regulations. Access to the tank sites, in reclaimed areas, during the construction phase will be along drainage bottoms or along temporary access roads to minimize damage to vegetation. N necessary, access routes will be reseeded with an approved seed mix. All topsoil will be salvaged prior to tank construction and spoil material will be used for construction of the embankments. Atter construction, topsoil will be replaced on the embankment and adjacent disturbed areas above the elevation of the emergency spillway. Each site will be seeded with the approved seed mbk. There are eight (8) existing temporary stock tanks at II-W: T-1, T-2, T-3, T-5, T-18, T-20, T-22 and T-24. Stock tanks T-1, T-2, T-3, T-22, and T-24 were constructed in 1991 and have been maintained in accordance with the methodology presented in this section and set forth in Attachment 13-11, TR-19 TR-t4 TR-29 (Design) TR48 TR-17 TR-35 TR-38/fR-40 PR-04 Stock Tank Typical Design. MR-57 7 Revised Ot/05