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RULE 4 PERFORMANCE STANDARDS <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 Lower <br />Wilson mining area. <br />3. Lower Wilson Creek (LWC) represents water quality immediately upstream of the confluence with <br />Taylor Creek. <br />It is reasonable to expect potential future monitoring activities for the Lower Wilson locations to mirror those <br />for the existing operation as it pertains to frequency and specific parameters. <br />Groundwater — Six alluvial groundwater sites will be monitored (Field parameters gathered during 1" through <br />4`h quarters, lab samples taken during 2 °d and 4`h quarters only). <br />Monitoring Type <br />Monitoring Location <br />Monitoring <br />Frequency <br />Quarterly Parameters <br />Calcium (Ca +2)o <br />Magnesium (Mg +2)p <br />Ammonia (NH3) <br />Alluvial Ground Water <br />Gossard Well' <br />Quarterly <br />See Below <br />Alluvial Ground Water <br />A -6 We112 <br />Quarterly <br />See Below <br />Alluvial Ground Water <br />North Good Spring We113 <br />Quarterly <br />See Below <br />Alluvial Ground Water <br />MT- 95 -02° <br />Quarterly <br />See Below <br />Alluvial Ground Water <br />A -75 <br />Quarterly <br />See Below <br />Alluvial Ground Water <br />A -86 <br />Quarterly <br />See Below <br />1. Gossard Well — Located within alluvium beneath the rail loop, this site represents the condition of the alluvial <br />aquifer in the vicinity of the Gossard Coal Loadout Facility. <br />2. A -6 Well — Located in the Good Spring Creek alluvium, this site represents the condition up- gradient of proposed <br />and current mining activities. <br />3. North Good Spring Well — Located in the Good Spring Creek alluvium, this site represents the down -dip <br />condition below existing and proposed mining activities. <br />4. MT -95 -02 — Located in the Taylor Creek alluvium, this site represents the down -dip condition below current and <br />proposed mining activities. <br />5. A -7 — Located in the West Fork of Good Spring Creek alluvium, this site represents a potential down -dip <br />condition below South Taylor mining activities. <br />6. A -8 - Located in the West Fork of Good Spring Creek alluvium, this site represents the condition up- gradient of <br />South Taylor mining activities. <br />Quarterly Alluvial Ground Water Field Parameters <br />Temperature Water Level I pH I Conductivity <br />Ouarterly Alluvial Ground Water Laboratory Parameters <br />pH <br />Conductivity at 25 °C <br />Total Dissolved <br />Solids <br />Bicarbonate (HCO3-)° <br />Calcium (Ca +2)o <br />Magnesium (Mg +2)p <br />Ammonia (NH3) <br />Nitrateu <br />Phosphate (PO4 as P) <br />Sodium (Na +) <br />Sulfate (SO4) <br />Arsenic (As) <br />Iron (Fe) <br />Lead (Pb) <br />Manganese FMn)TU <br />Mercury (Hg) <br />Selenium (Se) <br />Zinc (Zn) <br />D = Dissolved <br />TD = Total Dissolved <br />T = Total <br />TR = Total Recoverable <br />Prior to mining at Lower Wilson, the following three groundwater monitoring sites will be added to the <br />sampling schedule: <br />South Taylor /Lower Wilson — Rule 4, Page 12 Revision Date: 12/18/13 <br />Revision No.: MR -129 <br />