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

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Peabody Sage Creek Mine — Drainage and Sediment Control Plan activities will not result in any change to the existing disturbance footprint (i.e., the disturbance 40 boundary will not change nor will activities historically associated with the area change). In discussions between SCCC and CDRMS representatives on March 9, 2009, CDRMS agreed that the submittal of the approved designs and as -built plans were sufficient for the Peabody Sage Creek Mine permit application package as long as there were no new disturbance in the contributing watershed. Since SCCC will not change the disturbance footprint or activities in this area the existing and approved drainage control network from the Seneca II Mine permit was not re- evaluated as part of this Plan. The previously approved design and as -built plans for this pond are presented in Appendix 2.05.3 -E2.B, Sediment Pond 003 As -Built Report. Pond 004: Pond 004 is an existing sediment pond. Pond 004 is permitted by the WQCD as an industrial wastewater treatment facility. Pond 004, which is tributary to Cow Camp Creek tributary to Fish Creek, collects runoff from reclaimed and revegetated areas previously disturbed by mining activities for the Seneca II Mine. Surface activities associated with the Peabody Sage Creek Mine will not re- disturbed the landscape in the Pond 004 watershed. Consequently, the existing and approved drainage control network constructed for the Seneca II Mine was not re- evaluated for this Plan in accordance with the CDRMS guidance received on March 9, 2009. The as -built information for Pond 004 is presented in Appendix 2.05.3 -E2.C, Sediment Pond 004 As -Built Report. PECOCO Pond: PECOCO Pond is an existing pre - settling impoundment within the Pond 002 watershed. Since discharge from PECOCO ultimately flows to Pond 002 it is not a permitted • industrial wastewater treatment facility and not subject to the rules and regulations of WQCD. Runoff from a portion of the closed and reclaimed Seneca II mine area flows to PECOCO; including some areas that used to flow directly to Pond 002. PECOCO Pond was re- evaluated for this Plan to assure the existing configuration can adequately control the runoff from the expanded drainage area. The pond evaluation is presented in Appendix 2.05.3 -E2.D, PECOCO Pond Design Report. Surface Facilities Area: The Plan includes several pre- settling sumps and a network of runoff diversion ditches that will collect runoff from the South Surface Facilities and Portal Area and route the runoff to Pond 002. Two sediment traps immediately downgradient of the coal stockpile pad (Upper and Lower Coal Stockpile Sumps [UCSS and LCSS], respectively) will be used in the Plan as settling basins to pre -treat runoff from the coal stockpile pad and ancillary surface facilities at the portal area before it flows to Pond 002. The design evaluation for the Coal Stockpile Sumps is found in Appendix 2.05.3 -E2.E, Coal Stockpile Sump Design Report. Two sumps (Portal Sump #1 and Portal Sump #2) are located within the portal area to collect storm runoff from the small watershed that drains directly into the pit, as well as, store mine water discharge. The portal area sumps are non - discharging; the base elevation is below the native ground surface and, consequently, they do not gravity drain to a sediment pond. Water in the portal area sumps will be used to support the underground mine operations or get pumped to the Coal Stockpile Sumps and ultimately Pond 002. The Portal Area Sump design evaluation is presented in Appendix 2.05.3 -E2.F, Portal Area Sump Design Report. A series of existing runoff collection ditches and culverts were constructed in the North Facilities • Area as part of the Seneca II Mine operations. SCCC will not modify the surface water control network for the North Facilities Area. A series of new ditches and culverts have been designed for 2.05.3 -E2.3