2012-09-06_PERMIT FILE - C1981019A

• Permit No: C1981019A
• IBM Index Class Name: Permit File
• Doc Date: 9/6/2012
• Section_Exhibit Name: Rule 4 Performance Standards -ST
• Media Type: D
• Archive: Yes

RULE 4 PERFORMANCE STANDARDS
• 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.
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.
4. MT -95 -02 — Located in the Taylor Creek alluvium, this site represents the down -dip condition below current
and proposed mining activities.
5. A -7 — Located in the West Fork of Good Spring Creek alluvium, this site represents a potential down -dip
condition below South Taylor mining activities.
6. A -8 - Located in the West Fork of Good Spring Creek alluvium, this site represents the condition up- gradient
of South Taylor mining activities.
•
!4arterly Alluvial Ground Water Field Parameters
Temperature I Water Level I pH I Conductivity
Ouarterly Alluvial Ground Water Laboratory Parameters
pH
Conductivity at 25 °C
Total Dissolved
Solids
Bicarbonate (HCO3 )D
Calcium (Ca +z)D
Magnesium (Mg +2)D
Ammonia (NH3 )D
Nitrate
Phosphate (PO4 -3 as P)
Sodium (Na +)D
Sulfate (SO4)
Arsenic (As)
Iron (Fe)
Lead (Pb)
Manganese (Mn)
Mercury (Hg)
Selenium (Se)
Zinc (Zn)
D = Dissolved
TD = Total Dissolved
T = Total
TR = Total Recoverable
Prior to mining at Lower Wilson, the following three groundwater monitoring sites will be added to the
sampling schedule:
1. MW -95 -01 — Located in the Wilson Creek alluvium, this site represents the upstream,
undisturbed background conditions of the alluvial aquifer.
2. MW -05 -03 — Located in the Wilson Creek and unnamed drainage alluvium, this site
represents alluvial groundwater quality immediately downgradient from Lower Wilson.
3. MW -95 -02 — Located in the Wilson Creek alluvium, this site represents the downgradient
conditions below Lower Wilson and the proposed haul road.
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, Fill Piezometers - The Streeter Draw piezometer and the Section 16 Fill piezometer will be
monitored annually for water levels. The West Pit Fill piezometer will be monitored quarterly for water
levels. After mining, two additional piezometers will be installed into the toes of East Taylor Fill and
West Taylor Fill as described in Exhibit 21 Item 1. These piezometers will be added to the monitoring
program.
4.05.14 — 4.05.18 Various Topics
These sections are addressed in the original permit and will not change with addition of the South
is Taylor/Lower Wilson permit revision.
South Taylor /Lower Wilson — Rule 4, Page 19 Revision Date: 9/02/09
Revision No.: TR -81