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C. Sedimentation Ponds <br /> Sediment ponds to be constructed to treat disturbed area runoff are Ponds 10, <br /> 11, 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 to Pond 10. <br /> Pond I 1 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 similar 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 forming 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 11 and Seneca 11 West operations, <br /> such occurrences are expected to be infrequent and small. <br /> 1. The Division will require that all acid- or toxic-forming spoil be <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 <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 /> the permit application, and summarized briefly in tables 1-4 in this document. <br /> Your Mine 23 Ociober 19, 1999 <br />