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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 will be monitored, as a result of mining activity in the <br />Collom Pit as described below. Please refer to Exhibit 26, Item 1 for additional details regarding <br />the wells in the Collom Area listed below. Six valley fill groundwater sites will continue to be <br />monitored for the East Pit, West Pit, and South Taylor Pit. (Field parameters gathered during Is` <br />through 4`h quarters, lab samples taken during 2nd and 4"' quarter only). <br />Monitoring <br />Monitoring <br />Monitoring <br />Ouarterly Field Parameters <br />Annual Parameters <br />Type <br />Location <br />Frequency <br />Valley Fill <br />MC -04-011 <br />Quarterly <br />Water level, Temperature, <br />See Below <br />Groundwater <br />pH, Conductivity <br />Valley Fill <br />MC -04-02` <br />Quarterly <br />Water level, Temperature, <br />See Below <br />Groundwater <br />pH, Conductivity <br />Valley Fill <br />MLC -04-023 <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 />Groundwater <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 Well' <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-7 10 <br />Quarterly <br />Water level, Temperature, <br />See Below <br />Groundwater <br />H, Conductivity <br />Valley Fill <br />�1 <br />A-8 <br />Quarterly <br />Water level, Temperature, <br />See Below <br />Groundwater <br />H, 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 proposed 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 -04-02 — Located in the Lower Collom Gulch valley fill, this site will be located directly north of the <br />temporay spoils pile to be located in Lower Collom Gulch. This location is additionally designated as a <br />"Point of Compliance" well 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 proposed Collom Pit. <br />This location is additionally designated as a "Point of Compliance" well for valley fill groundwater <br />monitoring purposes. <br />5. MJ -95-03 - Located in the Jubb Creek valley fill just downstream of the confluence of the West and East <br />Forks of Jubb Creek, this site represents the condition of the valley -fill aquifer downgradient of the proposed <br />Collom Pit. <br />Collom — Rule 4, Page 9 Revision Date: 4/18/16 <br />Revision No.: PR -04 <br />