2010-05-07_PERMIT FILE - C2009087A (28)

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Peabody Sage Creek Mine — Drainage and Sediment Control Plan channels generally collect surface runoff from closed and reclaimed Seneca II Mine operations areas and route the surface runoff to the existing ponds. The existing and approved Seneca II Mine • channels utilized in this Plan are summarized in Section 4.0, Ditch and Culvert Designs. 1.1 Operational Drainage and Sediment Control The drainage and sediment control structures that Sage Creek Coal Company (SCCC) will use during mining operations, including the existing Seneca 11 Mine structures, are shown on Map 2.05.3 M4, Drainage and Sediment Control Plan. Existing, approved structures permitted by CDRMS for drainage and sediment control at the closed Seneca U Mine constitute much of the operational drainage control network utilized in the Plan. The .drainage and sediment control plan covers approximately 3,605 acres: the drainage area for Pond 002 is 3,028 acres, the area for Pond 003 is 30.1 acres and the Pond 004 watershed is 547 acres. The extent of disturbance within each watershed from construction and operation of the Peabody Sage Creek Mine facilities is: • Pond 002 — approximately 120 acres. The disturbed acreage includes the South Surface Facilities and Portal Area, the topsoil stockpile and Roads "A ", `B" and "B/E1" • Pond 003 — approximately 13.5 acres. The disturbed acreage includes the North Facilities Area (the old Seneca II Mine shop/bathhouse /parking lot area, as well as some ancillary features) • Pond 004 — there are no disturbed acres within the watershed. • Office/Boneyard Small Area Exemption — this is an existing 5.4 acre SAE from the historic • Seneca II Mine operations An additional 56.7 acres within the Pond 002 watershed may be disturbed by Peabody Sage Creek Mine operations. This area, located east of Road "A" in the old Seneca 11 Mine "Pre -Law Mine Area" is being permitted as disturbed and consequently evaluated as disturbed in the hydrologic assessment for the watershed. Pond 002: Pond 002 is an existing sediment pond. Pond 002 is permitted by the Colorado Water Quality Control Division (WQCD) as an industrial wastewater treatment facility. Most of the surface disturbance associated with the Peabody Sage Creek Mine is within the Pond 002 watershed. Consequently, the pond and associated drainage network were re- evaluated for this Plan to assure Pond 002, in its existing approved configuration, retained sufficient capacity to meet the applicable rules and regulations of the Colorado Mined Land Reclamation Board for Coal Mining. The Pond 002 watershed is approximately 3,028 acres; 177 acres or approximately 6% of the area could be disturbed by Peabody Sage Creek Mine surface activities. The watershed is tributary to Little Grassy Creek which is tributary to Grassy Creek. The pond evaluation is presented in Appendix 2.05.3 -E2.A, Sediment Pond 002 Design Report. Pond 003: Pond 003 is an existing, approved sediment pond. Pond 003 is permitted by the WQCD as an industrial wastewater treatment facility. Pond 003 collects runoff from the North Facilities Area — the historic Seneca IT Mine shop /warehouse /ofce area. The approximately 30.1 acre • watershed is tributary to Grassy Creek immediately downstream of its confluence with Little Grassy Creek. While SCCC plans to utilize the North Facilities Area to support its mining operations, the 2.05.3 -E2.2