2009-08-13_PERMIT FILE - C1981019A ‎(7)‎

• Permit No: C1981019A
• IBM Index Class Name: Permit File
• Doc Date: 8/13/2009
• 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.
Quarterly Surface Water Field Parameters
Temperature Flow pH Conductivity
Ouarterly Surface Water Laboratorv Parameters
Flow pH Conductivity Total Dissolved Total Suspended
Solids Solids
Bicarbonate (HC03) Calcium (Ca+) Magnesium (Mg+) Ammonia (NH3) Nitrate-Nitrite
Phosphate Sodium (Na') Sulfate (SOO Arsenic (As) Iron - Total
PO4 as P) -- I
Lead (Pb) Mercury (Hg) Manganese (Mn)
r 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 - Six alluvial groundwater sites will be monitored (Field parameters gathered during Is'
through 4th quarters, lab samples taken during 2t,d and 4th quarters only).
Monitoring Tyne 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 Well3 Quarterly See Below
Alluvial Ground Water MT-95-024 Quarterly See Below
Alluvial Ground Water A-75 Quarterly See Below
Alluvial Ground Water A-86 Quarterly See Below
1. Gossard Well - Located within alluvium beneath the rail loop, this site represents the condition of the
alluvial aquifer in the vicinity of the Gossard Coal Loadout Facility.
South Taylor/Lower Wilson - Rule 4, Page 18 Revision Date: 3/04/08
Revision No.: TR-70