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RULE 4 PERFORMANCE STANDARDS
<br />
<br />Collom – Rule 4, Page 10 Revision Date: 7/28/21
<br /> Revision No.: MR-237
<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 />
<br />Groundwater – Eleven valley fill groundwater sites and one deep groundwater well will be monitored as a
<br />result of mining activity at Colowyo. Please refer to Exhibit 26, Item 1 for additional details regarding
<br />the wells in the Collom Area. Field parameters and laboratory anaylsis are gathered each quarter.
<br />
<br />Monitoring
<br />Type
<br />Monitoring
<br />Location
<br />Monitoring
<br />Frequency Quarterly Field Parameters Quarterly Parameters
<br />Valley Fill
<br />Groundwater MC-04-011 Quarterly Water level, Temperature,
<br />pH, Conductivity See Below
<br />Valley Fill
<br />Groundwater MC-04-022 Quarterly Water level, Temperature,
<br />pH, Conductivity See Below
<br />Valley Fill
<br />Groundwater MLC-04-013 Quarterly Water level, Temperature,
<br />pH, Conductivity See Below
<br />Valley Fill
<br />Groundwater MJ-95-014 Quarterly Water level, Temperature,
<br />pH, Conductivity See Below
<br />Valley Fill
<br />Groundwater MJ-95-035 Quarterly Water level, Temperature,
<br />pH, Conductivity See Below
<br />Valley Fill
<br />Groundwater Gossard Well6 Quarterly Water level, Temperature,
<br />pH, Conductivity
<br />See Below
<br />Valley Fill
<br />Groundwater A-6 Well7 Quarterly Water level, Temperature,
<br />pH, Conductivity
<br />See Below
<br />Valley Fill
<br />Groundwater
<br />North Good
<br />Spring Well8 Quarterly Water level, Temperature,
<br />pH, Conductivity
<br />See Below
<br />Valley Fill
<br />Groundwater MT-95-029 Quarterly Water level, Temperature,
<br />pH, Conductivity
<br />See Below
<br />Valley Fill
<br />Groundwater A-710 Quarterly Water level, Temperature,
<br />pH, Conductivity
<br />See Below
<br />Valley Fill
<br />Groundwater A-811 Quarterly Water level, Temperature,
<br />pH, Conductivity
<br />See Below
<br />Groundwater
<br />Well
<br />Trout Creek
<br />Well12 Quarterly Water level, Temperature,
<br />pH, Conductivity
<br />See Below
<br />Alluvial Well LGSW-1 Quarterly Water level, Temperature,
<br />pH, Conductivity
<br />Please see Volume 2C
<br />Exhibit 7, Item 19, Table 16
<br />Alluvial Well LWCW-1 Quarterly Water level, Temperature,
<br />pH, Conductivity
<br />Please see Volume 2C
<br />Exhibit 7, Item 19, Table 16
<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. The applicable standards are the
<br />Department of Public Health and Evnironment Water Quality Control Comission Regulation 41 - The Basic
<br />Standards for Ground Water, Interim Narrative Standard.
<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. The applicable standards are the Department of Public
<br />Health and Evnironment Water Quality Control Comission Regulation 41 - The Basic Standards for Ground
<br />Water, Interim Narrative Standard.
<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
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