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RULE 4 PERFORMANCE STANDARDS
<br />Prior to mining at Lower Wilson, the following three surface water monitoring sites will be added to the
<br />sampling schedule:
<br />1. Upper Wilson Creek (UWC) represents water quality upstream of all mining impacts.
<br />2. Upper Middle Wilson Creek (UMWC) represents water quality downstream of the proposed
<br />Lower Wilson mining area.
<br />3. Lower Wilson Creek (LWC) represents water quality immediately upstream of the confluence
<br />with Taylor Creek.
<br />Groundwater — Five valley fill groundwater sites and one deep groundwater well will be monitored, as a
<br />result of mining activity in the Collom Pit as described below. Please refer to Exhibit 26, Item 1
<br />for additional details regarding the wells in the Collom Area listed below. Six valley fill
<br />groundwater sites will continue to b e monitored for the East Pit, West Pit, and South Taylor Pit.
<br />(Field parameters gathered during 15' through 4th quarters, lab samples taken during 2nd and 41h
<br />quarter only).
<br />Monitoriny-
<br />Monitoring
<br />Monitoring
<br />Quarterly Field Parameters
<br />Annual Parameters
<br />Te
<br />Location
<br />Fre uenc
<br />Valley Fill
<br />MC -04-01'
<br />Quarterly
<br />Water level, Temperature,
<br />See Below
<br />Groundwater
<br />pH, Conductivity
<br />Valley Fill
<br />MC -04-022
<br />Quarterly
<br />Water level, Temperature,
<br />See Below
<br />Groundwate
<br />pH, Conductivity
<br />Valley Fill
<br />MLC -04-013
<br />Quarterly
<br />Water level, Temperature,
<br />See Below
<br />Groundwater
<br />pH, Conductivity
<br />Valley Fill
<br />MJ -95-014
<br />Quarterly
<br />Water level, Temperature,
<br />See Below
<br />Groundwate
<br />pH, Conductivity
<br />Valley Fill
<br />MJ -95-035
<br />Quarterly
<br />Water level, Temperature,
<br />See Below
<br />Groundwater
<br />pH, Conductivity
<br />Valley Fill
<br />Gossard Wel16
<br />Quarterly
<br />Water level, Temperature,
<br />See Below
<br />Groundwater
<br />pH, Conductivity
<br />Valley Fill
<br />A-6 Well'
<br />Quarterly
<br />Water level, Temperature,
<br />See Below
<br />Groundwater
<br />pH, Conductivity
<br />Valley Fill
<br />North Good
<br />Quarterly
<br />Water level, Temperature,
<br />See Below
<br />Groundwater
<br />Spring Wella
<br />H, Conductivity
<br />Valley Fill
<br />MT -95-029
<br />Quarterly
<br />Water level, Temperature,
<br />See Below
<br />Groundwater
<br />pH, Conductivity
<br />Valley Fill
<br />A -710Q
<br />y uarterl
<br />Water level, Temperature,
<br />See Below
<br />Groundwater
<br />pH, Conductivity
<br />Valley Fill
<br />A -811Q
<br />y uarterl
<br />Water level, Temperature,
<br />See Below
<br />Groundwater
<br />H, Conductivity
<br />Groundwater
<br />Trout Creek
<br />12
<br />Quarterly
<br />Water level, Temperature,
<br />See Below
<br />Well
<br />Well
<br />pH, Conductivity
<br />1. MC -04-01 — Located in the Collom Gulch valley fill, this site represents the condition of the Collom Gulch
<br />valley -fill aquifer adjacent to the Collom Pit.
<br />2. MC -04-02 — Located in the Collom Gulch valley fill, this site represents the condition of the Collom Gulch
<br />valley -fill aquifer downgradient of the Collom Pit. This location is additionally designated as a "Point of
<br />Compliance" well for valley fill groundwater monitoring purposes.
<br />3. MLC -04-01 — Located in the Lower Collom Gulch valley fill, this site will be located north of the temporay
<br />spoils pile in Lower Collom Gulch. This location is additionally designated as a "Point of Compliance" well
<br />for valley fill groundwater monitoring purposes.
<br />4. MJ -95-01 — Located in the West Fork Jubb Creek valley fill, this site represents the condition of the West
<br />Fork Jubb Creek valley fill aquifer adjacent to the northeast (downgradient) side of the Collom Pit. This
<br />location is additionally designated as a "Point of Compliance" well for valley fill groundwater monitoring
<br />purposes.
<br />Collom —Rule 4, Page 10 Revision Date: 4/7/17
<br />Revision No.: RN -07
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