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C. Sedimentation Ponds <br />Sediment ponds to be constructed to treat disturbed area runoffaze Ponds 10, <br />11, l la, 12, 13, and 14. Ponds 10, 11, and 12 were constructed during the <br />first permit term. Ponds 1 I a, 13, and 14 were constructed during the second <br />permit term. Pond 10 treats disturbed azea runoff from approximately 385 <br />acres, in addition to approximately 550 acres of undisturbed azea. Pond 11 <br />treats runoff from approximately 78 disturbed acres. Runofffrom roughly 64 <br />undisturbed acres will also be routed through the pond. Pond lla was <br />designed to control runoff and erosion east of the North Pit. Pond 11 a was <br />installed at the head of the YPM-12 drainage above Pond 11; approximately <br />57 acres of disturbed area runoff flows to Pond lla and subsequently <br />dischazges to Pond 11 for treatment prior to dischazge. Pond 12 treats runoff <br />from approximately 31 undisturbed acres and 287 acres of disturbed azea. <br />Pond ] 3 treats disturbed area runoff from approximately 23.5 acres and <br />undisturbed azea runoff from approximately 9.8 acres. Pond 14 treats <br />disturbed azea runoff from approximately 117 acres, in addition to <br />approximately 37 acres of undisturbed area. <br />There are no variances from the requirements of the Rules and Regulations <br />proposed at this time. Therefore, no specific findings regazding <br />sedimentation ponds have been made. <br />D. Acid-forming and Toxic-forming Spoil <br />The over and interburden material associated with the Wadge and Wolf Creek <br />coal seams at the Yoast Mine is similaz in nature to the corresponding <br />materials at the neazby Seneca II and Seneca II West coal mines. Only a <br />minor portion of the spoil generated by the mining operation has the potential <br />to beacid-forming ortoxic-forming. This is due to acid forming potential of <br />a fraction of Wolf Creek overburden and low pH and high Boron found in and <br />neaz the Lennox coal seam. Seneca Coal Company will sample regraded <br />spoil material in areas of potential concern prior to replacement of topsoil to <br />determine the presence of acid ortoxic forming spoil material at the surface <br />of regraded pits. Any azeas with chazacteristics unsuitable for plant growth <br />will be treated chemically or buried with at least four feet of topsoil. Based <br />on the observations at the neazby Seneca II and Seneca II West operations, <br />such occurrences are expected to be infrequent and small. <br />The Division will require that all acid- or toxic-forming spoil is <br />buried or otherwise treated, as discussed above. Burial within thirty <br />days is not feasible and the delay will not result in any material risk of <br />water pollution or other environmental damage. (4.05.8(3)). <br />E. Surface and Ground Water Monitoring <br />Yoast Mine 24 August 3, 2005 <br />