2007-08-20_PERMIT FILE - C1981019A ‎(2)‎

• Permit No: C1981019A
• IBM Index Class Name: Permit File
• Doc Date: 8/20/2007
• Section_Exhibit Name: Rule 4 Performance Standards -ST
• Media Type: D
• Archive: Yes

RULE 4 PERFORMANCE STANDARDS
1. Lower Taylor Creek (LTC) represents the water quality conditions of Taylor Creek directly
downstream of the South Taylor mining area and immediately prior to the confluence with Wilson
Creek and immediately downstream of the Gossard Loadout.
2. Lower West Fork Good Spring Creek (LWFGSC) represents this tributary after potential impacts
caused by South Taylor mining.
3. East Fork Good Spring Creek (EFGSC) represents the upstream, undisturbed background condition
of the East Fork Good Spring Creek.
4. Upper West Fork Good Spring Creek (UWFGSC) represents the upstream, undisturbed background
condition of the West Fork Good Spring Creek.
5. New Upper Good Spring Creek (NUGSC) represents the water quality of Good Spring Creek
downstream of the confluence of the east and west forks of the creek and downstream of the South
Taylor mining area.
6. Lower Good Spring Creek (LGSC) represents the water quality downstream of the South Taylor and
existing mining areas.
•
Monthly Surface Water Parameters
pH Conductivity Temperature Total Suspended Solids Flow
nuarterly Surface Water Parameters

Flow
pH
Conductivity Total Dissolved
Solids Total Suspended
Solids
Bicarbonate (HC03) Calcium (Ca+) Magnesium (Mg+) Ammonia (NH3) Nitrate-Nitrite
Phosphate Sodium (Na+) Sulfate (SO4) Arsenic (As) Iron -Total
(PO4 s as P)
Lead (Pb) Mercury (Hg) Manganese (Mn) Selenium (Se) Zinc (Zn)
Prior to mining at Lower Wilson, the following three surface water monitoring sites will be added
to the sampling schedule:
1. Upper Wilson Creek (UWC) represents water quality upstream of all mining impacts.
2. Upper Middle Wilson Creek (UMWC) represents water quality downstream of the
proposed Lower Wilson mining area.
3. Lower Wilson Creek (LWC) represents water quality immediately upstream of the
confluence with Taylor Creek.

It is reasonable to expect potential future monitoring activities for the Lower Wilson locations to
mirror those for the existing operation as it pertains to frequency and specific parameters.
Groundwater -Four alluvial groundwater sites will be monitored.

Monitoring Type
Monitoring Location Monitoring
Fre uenc
Quarterly Parameters
Alluvial Ground Water Gossard Well Quarterly See Below
Alluvial Ground Water A-6 We112 Quarterly See Below
Alluvial Ground Water North Good Spring We113 Quarterly See Below
Alluvial Ground Water MT-95-024 Quarterly See Below
1. Gossard Well -Located within alluvium beneath the rail loop, this site represents the conatuon or
the alluvial aquifer in the vicinity of the Gossard Coal Loadout Facility.
2. A-6 Well -Located in the Good Spring Creek alluvium, this site represents the condition up-
gradient of proposed and current mining activities.
3. North Good Spring Well -Located in the Good Spring Creek alluvium, this site represents the
down-dip condition below existing and proposed mining activities.
South Taylor/Lower Wilson -Rule 4, Page 18
Revision Date: 6/28/07
Revision No.: MR-88