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C. Sedimentation Ponds <br />Sediment ponds to treat disturbed area runoff are Pond 002, PeCoCo <br />Impoundment, Pond 003, and Pond 004. The Division approved these ponds <br />as permanent impoundments in TR37 to the Seneca II Mine permit. With the <br />exception of the PeCoCo pond spillway, which has been converted to a single <br />channel for primary and emergency spillways, PSCM does not propose <br />additional modification to the ponds for the use in the PSCM operations. <br />D. Acid-forming and Toxic -forming Spoil <br />The PSCM re -disturbed the Seneca II surface mine spoil during the <br />excavation of the PSCM portal face -up area. The PSCM will also generate <br />underground development waste during mining. Sections 2.04.6 and 2.04.9 of <br />the permit application describe the chemical characteristics of soil, <br />overburden, and the Wadge coal seam. The chemical data indicate no acid- <br />forming or toxic -forming materials. <br />E. Surface and Ground Water Monitoring <br />The applicant will conduct monitoring of ground water in a manner approved <br />by the Division. The ground water monitoring plan is listed in Table 2.04.7- <br />T9 (4.05.13(1)): <br />The applicant will conduct monitoring of surface water in a manner approved <br />by the Division. The monitoring plan is listed in Table 2.04.7-T-10 <br />(4.05.13(2)): <br />F. Probable Hydrologic Consequences <br />Probable hydrologic consequences of the proposed PSCM mining operation <br />are discussed in Section 2.05.6(3)(b)(iii) of the permit application. Of the <br />various probable hydrologic consequences predicted for the PSCM, loading of <br />streams with salts (mainly calcium sulfate) is considered to be the most <br />substantial impact. This loading is the continuation of on-going salt -loading of <br />Little Grassy Creek at Pond 002 from coal spoil leachate that has flowed into <br />the pond from reclaimed Seneca II Mine surface pits since the pond was <br />constructed. <br />Underground activities approved at the PSCM are not predicted to add to the <br />currently on-going salt loading of surface water, as all water that seeps into <br />the underground mine workings is either expected to be consumed by dust <br />control in the workings or is predicted to dilute the water in Pond 002. If all <br />