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RULE 4 PERFORMANCE STANDARDS
<br />Groundwater — Five additional alluvial groundwater sites will be monitored, as a result of
<br />expanding mining activity into the Collom Expansion Area as described below. Please
<br />refer to Exhibit 26, Item 1 for additional details regarding the wells in the Collom
<br />Expansion Area listed below. The existing six alluvial groundwater sites will continue to
<br />be monitored to some degree. (Field parameters gathered during 1't through 4th quarters,
<br />lab samples taken during 2 °d quarter only).
<br />Monitoring
<br />Monitoring
<br />Monitoring
<br />Quarterly Parameters
<br />Annual Parameters
<br />Type
<br />Location
<br />Fre uenc
<br />Alluvial
<br />MC-04-011
<br />Quarterly
<br />Water level, Temperature,
<br />See Below
<br />Groundwater
<br />pH, Conductivity
<br />Alluvial
<br />MC -04 -022
<br />Quarterly
<br />Water level, Temperature,
<br />See Below
<br />Groundwater
<br />pH, Conductivity
<br />Alluvial
<br />MLC -04 -013
<br />Quarterly
<br />Water level, Temperature,
<br />See Below
<br />Groundwater
<br />pH, Conductivity
<br />Alluvial
<br />MJ -95 -014
<br />Quarterly
<br />Water level, Temperature,
<br />See Below
<br />Groundwater
<br />pH, Conductivity
<br />Alluvial
<br />MJ -95 -035
<br />Quarterly
<br />Water level, Temperature,
<br />See Below
<br />Groundwater
<br />H, Conductivity
<br />Alluvial
<br />Gossard
<br />Quarterly
<br />Water level, Temperature,
<br />See Below
<br />Groundwater
<br />Well6
<br />H, Conductivity
<br />Alluvial
<br />A -6 Well'
<br />Quarterly
<br />Water level, Temperature,
<br />See Below
<br />Groundwater
<br />pH, Conductivity
<br />Alluvial
<br />North Good
<br />Quarterly
<br />Water level, Temperature,
<br />See Below
<br />Groundwater
<br />Spring Well'
<br />pH, Conductivity
<br />Alluvial
<br />MT -95 -029
<br />Quarterly
<br />Water level, Temperature,
<br />See Below
<br />Groundwater
<br />pH, Conductivity
<br />Alluvial
<br />A-710 1�
<br />Water level, Temperature,
<br />See Below
<br />Groundwater
<br />pH, Conductivity
<br />Alluvial
<br />A-811 i�
<br />Water level, Temperature,
<br />See Below
<br />Groundwater
<br />pH, Conductivity
<br />1. MC -04 -01 — Located in the Collom Gulch valley fill, this site represents the condition of the Collom
<br />Gulch valley -fill aquifer adjacent to the proposed Collom Lite pit. This location is additionally
<br />designated as a "Point of Compliance" well for alluvial groundwater monitoring purposes.
<br />2. MC -04 -02 — Located in the Collom Gulch valley fill, this site represents the condition of the Collom
<br />Gulch valley -fill aquifer adjacent to the proposed Little Collom X pit.
<br />3. MLC -04 -01 — Located in the Little Collom Gulch valley fill, this site represents the condition of the
<br />Little Collom Gulch valley -fill aquifer below the proposed mining activities.
<br />4. MJ -95 -01 — Located in the West Fork Jubb Creek valley fill, this site represents the condition of the
<br />West Fork Jubb Creek valley fill aquifer adjacent to the northeast (downgradient) side of the
<br />proposed Collom Lite pit.
<br />5. MJ -95 -03 - Located in the Jubb Creek valley fill just downstream of the confluence of the West and
<br />East Forks of Jubb Creek, this site represents the condition of the valley -fill aquifer downgradient of
<br />the proposed Collom Lite pit.
<br />6. Gossard Well — Located within alluvium beneath the rail loop, this site represents the condition of
<br />the alluvial aquifer in the vicinity of the Gossard Coal Loadout Facility.
<br />7. A -6 Well — Located in the Good Spring Creek alluvium, this site represents the condition up-
<br />gradient of proposed and current mining activities.a
<br />8. North Good Spring Well — Located in the Good Spring Creek alluvium, this site represents the
<br />down -dip condition below existing and proposed mining activities.
<br />9. MT -95 -02 — Located in the Taylor Creek alluvium, this site represents the down -dip condition
<br />below current and proposed mining activities.
<br />10. A -7 — Located in the West Fork of Good Spring Creek alluvium, this site represents a potential
<br />down -dip condition below South Tayloi mining activities.
<br />Collom — Rule 4, Page 15 Revision Date: 9/28/11
<br />Revision No.: PR -03
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