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C. Sedimentation Ponds <br />Sediment ponds to be constructed to treat disturbed area runoff are Ponds 10, <br />l 1, 12, 13, and 14. Ponds 10, 11, and 12 were constructed during the first <br />permit term. Pond 10 treats disturbed area runoff from approximately 385 <br />acres. in addition to approximately 550 acres of undisturbed area. Mining <br />disturbance for the first four years of the permit term will drain [o Pond 10. <br />Pond 11 treats runoff from approximately 78 disturbed acres. Runoff from <br />roughly 64 undisturbed acres will also be routed through the pond. Pond 12 <br />treats runoff from approximately 80 undisturbed acres and 237 acres of <br />disturbed area. Ponds 13 and 14 will be constructed during the second permit <br />term. <br />There are no variances from the requirements of the Rules and Regulations <br />proposed at this time. Therefore, no specific findings regarding <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 nearby 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 be acid-forming or toxic-forming. This is due to acid fornung potential of <br />a fraction of Wolf Creek overburden and low pH and high Boron found in <br />and near 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 or toxic forming spoil material at the surface <br />of regraded pits. Any areas with characteristics 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 nearby 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 be <br />buried or otherwise treated, as discussed above. $urial within thirty <br />days is not feasible and the delay will not result in any material risk <br />of water pollution or other environmental damage. (4.05.8(3)). <br />E. Surface and Ground Water Monitoring <br />Seneca Coal Company has devised a water monitoring plan that will enable <br />the Division to determine what, if any, impacts the operation will have on the <br />prevailing hydrologic balance. The plan is described in detail in Tab 15 of <br />[he permit application, and summarized briefly in tables 1-4 in this document. <br />Yuut Mme 23 March 6. ?001 <br />