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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 <br />