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

• As described in this section, potential water quality impacts will be
minimized by EFCI's operational practices and specific mitigation
measures. Operating experience and monitoring data obtained to date
indicated no specific treatment measures other than conventional drainage
and sediment control are necessary to meet applicable effluent
limitations. Where practicable, temporary diversion ditches are utilized
to divert runoff from undisturbed areas around those areas affected by
mining and related activities. This approach minimizes total retention
capacity for sedimentation ponds, since retention volumes relate directly
to runoff volumes from contributing disturbed and undisturbed drainage
areas. Existing temporary and permanent diversion ditches are shown on
the Mine Area Surface and Groundwater Hydrology Map, (Map 12), Loadout
Area Surface and Groundwater Hydrology Map, (Map 13) and Drainage and
Sediment Control Map, (Map 20). In addition, a detailed discussion of
diversion ditch design, construction, operation, and maintenance is
presented later in this section. Design specifications and calculations
for diversion ditches are included in Exhibit 19, Drainage and Sediment
• Control Plan.
Other practices employed to meet the requirements of Part 4.05 include
prompt revegetation according to the time-tables set forth in Section
2.04.5, Reclamation Plan, control of both overland and ditch flow
velocities through proper grading, reestablishment of natural drainage
patterns and revegetation or placement of riprap in drainage channels, and
other localized flow and sediment control measures. No acid or toxic
forming materials are present in either mine or loadout disturbance areas
which would require selective placement or sealing. Chemical
characteristics of soil, coal, roof and floor materials and coal
processing refuse are discussed in Sections 2.04.6, Geology Description,
2.04.9, Soils Resource Information, and 2.05.6, Mitigation of Surface Coal
Mining Operation Impacts.
An evaluation of possible long-term effects of Southfield's mining and
related operations is presented in Section 2.05.6, Mitigation of Surface
• Coal Mining Operation Impacts. This evaluation indicates that long-term
adverse effects will be negligible and no special mitigation or water
treatment measures beyond those conventional methods discussed will be
4.05-3