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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, PSC does not propose additional <br /> modification to the ponds for the use in the PSC operations. Pond 004 <br /> received Phase III Bond release with the approval of SL-4 in June of 2018. <br /> Pond 004 collects runoff as well as water from two long term spoil springs. <br /> These springs are sampled and regulated through the PSC NPDES permit but no <br /> longer regulated by the Division. <br /> D. Acid-forming and Toxic-fanning Spoil <br /> The PSC re-disturbed the Seneca II surface mine spoil during the excavation <br /> of the PSC portal face-up area. The PSC will also generate underground <br /> development waste during mining. Sections 2.04.6 and 2.04.9 of the permit <br /> application describe the chemical characteristics of soil, overburden, and the <br /> Wadge coal seam. The chemical data indicate no acid- forming or toxic- <br /> 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 PSC mining operation are <br /> discussed in Section 2.05.6(3)(b)(111) of the permit application. Of the <br /> various probable hydrologic consequences predicted for the PSC, 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 <br /> of Little Grassy Creek at Pond 002 from coal spoil leachate that has flowed <br /> into the pond from reclaimed Seneca II Mine surface pits since the pond was <br /> constructed. <br /> Page 16 of 27 <br />