2010-05-07_GENERAL DOCUMENTS - C2009087

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structure of this pond are proposed for PSCM operations. 'The pond has a permanent pool of 5.1 acre-feet. Pond 004 Pond 004 was constructed in 1982 when Seneca II mining entered the Fish Creek basin in the southeast part of the permit area. Pond 004 is located on Cow Camp Creek and drains an area of 393 acres, composed of surface runoff and coal spoil leachate from reclaimed lands proposed for transfer from the Seneca II Mine to the PSCM. Spoil spring inflow maintains a 10-acre-foot permanent pool in the pond. The Division approved Ponds 002, 003, 004, and Pecoco as permanent impoundments in TR-37 to the Seneca II Mine permit application (C-80•-005). The approval was based on permanent impoundment demonstrations that included letters from the appropriate landowners requesting that the ponds be left in palace as permanent features. Certified as-built designs for the ponds and the diversions to the ponds are provided in Section 3 of Exhibit 2.05.3-E2 of the PSCM permit application. The designs include the original permanent impoundment demonstrations. Ponds 002, 003, 004, and Pecoco will treat all disturbed area drainage, with the exception of drainage from the bone yard and office/warehouse office areas in the North Facilities area. With the exception of the previously described changes to the PeCoCo pond spillway, PSCM does not propose modifications to the ponds, and the as-built designs indicate the ponds are adequately designed for PSCM's operations; thereifore, the Division proposes to approve the ponds for use in the PSCM's operations and as permanent impoundments in the PSCM permit area. Two sumps having total capacity of 4.8 acre-feet will be used in the coal stockpile area for pre-treating runoff from the South Facilities area prior to its flow to Pond 002. Two sumps having total capacity of 1.9 acre-feet will be used immediately outside the portals for collecting runoff in the portal area and for temporary storage ofunderground mine water. Appendix 2.05.3-E-E of the permit application contains designs for all of the sumps. D. Acid-forming and Toxic-forming Spoil The PSCM will re-disturb surface mine spoil during the excavation of the portal face- up area. The PSCM will also generate underground development waste during mining. Sections 2.04.6 and 2.04.9 of the permit application describe the chemical characteristics of soil, overburden, and the Wadge coal seam. The chemical data indicate no acid-forming or toxic-forming materials. Volume 3, Tab 6 of the Seneca II Mine permit application describes chemical characteristics of the overburden and interburden on the reclaimed lands that are proposed for transfer to PSCM permit area. The Division has previously found that acid and toxic-forming materials will not constitute a problem in the Wadge mining areas of the Seneca 11 Mine permit area based on an absence of such materials (Seneca II Mine findings document). Although minor amounts of poor to unsuitable zones were found in Wolf Creek seam and Lennox seam mining areas, potential impacts were Peabody Sage Creek Mine 22 May 7, 2010