2007-10-22_PERMIT FILE - C1981014A ‎(5)‎

• Permit No: C1981014A
• IBM Index Class Name: Permit File
• Doc Date: 10/22/2007
• Section_Exhibit Name: 4.05 Hydrologic Balance
• Media Type: D
• Archive: Yes

indicate that while surface and groundwater resources are limited in areas
affected by the Southfield operations, they will be adequate in terms of
both quantity and quality to support these proposed uses.
As described in Sections 2.05.4, Reclamation Plan and 2.05.6, Mitigation
of Surface Coal Mining Operation Impacts, the existing temporary diversion
on Magpie Creek will, upon completion of mining and related activities,
be modified to meet regulatory requirements far permanent diversions.
None of the other major drainages in the mine, loadout or adjacent areas
will be directly affected by mining and related activities. In addition,
natural surface flow patterns will be reestablished by reclamation of
disturbance areas to ensure effective transmission of surface water runoff
and minimize potential erosion.
Changes in water quality will be minimized during active mining and
reclamation through specific operation practices, localized drainage and
sediment control practices, and the use of drainage and sediment control
structures. The quantity of water available for proposed post-mining land
uses after complete reclamation of all surface disturbance including
sedimentation ponds will not be appreciably different than under pre-
mining conditions. Temporary localized depression of the piezometric
surface may occur in the mine area due to underground operations.
Continuous recharge following completion of mining will effectively
restore pre-mining piezometric levels and groundwater availability will
not be significantly impacted.
Water quality standards and effluent limitations for discharges from the
Southfield permit areas are regulated by the U.S. Environmental Protection
Agency and the Colorado Department of Health under the terms of NPDES
Permit Nos. CO-0036595 (Mine Area) and CO-0037109 (loadout Area) which are
included in Exhibit 4, Other Permits. Compliance with applicable NPDES
effluent limitations is obtained by diversion of runoff from undisturbed
areas around areas effected by mining operations, drainage and sediment
control measures, reclamation practices designed to effectively restore
effected areas, and a comprehensive ongoing monitoring program. Water
quality control measures are discussed in detail in Section 2.05.6,
Mitigation of Surface Coal Mining Operation Impacts.
4.05-2