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RULE 4 PERFORMANCE STANDARDS <br />r1 <br />U <br />u <br />4uarterly Surface Water Parameters <br />Flow pH Conductivity Total Dissolved <br />Solids Total Suspended <br />Solids <br />Bicazbonate (HCOs) Calcium (Ca'Z) Magnesium (MG"'Z) Ammonia (NHS) Nitrate-Nitrite <br />Phosphate (PO; as P) Sodium (Nay) Sulfate (SO4) Arsenic (As) Iron -Total <br />Lead (Pb) Mercury (Hg) Manganese (Mn) Selenium (Se) Zinc (Zn) <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 with <br />Taylor Creek. <br />It is reasonable to expect potential future monitoring activities for the Lower Wilson locations to mirror <br />those for the existing operation as it pertains to frequency and specific parameters. <br />Groundwater- Four alluvial groundwater sites will be monitored. <br />Monitoring Type Monitoring Location Monitoring Frequency Quarterly Parameters <br />Alluvial Ground Water Gossazd Well' Quarterly See Below <br />Alluvial Ground Water A-6 WellZ Quarterly See Below <br />Alluvial Ground Water North Good Spring Well Quarterly See Below <br />Alluvial Ground Water MT-95-02" Quarterly See Below <br />I. Gossard Well -Located within alluvium beneath the rail looq [his site represents the condition of the <br />alluvial aquifer in the vicinity ofthe Gossard Coal Loadout Facility. <br />2. A-6 Well -Located in [he Good Spring Creek alluvium, this site represents the condition up-gradient of <br />proposed and cameo[ mining activities. <br />3. North Good Spring Well -Located in [he Good Spring Creek alluvium, this site represents [he down-dip <br />condition below existing and proposed mining activities. <br />4. MT-95-02 -Located in the Taylor Creek alluvium, [his site represents the down-dip condition below current <br />and proposed mining activities. <br />Ouarterly Alluvial Ground Water Parameters <br />PH Conductivity at <br />25°C Total Dissolved Solids Bicarbonate (HC03) Calcium (Ca~Z) <br />Magnesium (MG-'~) Ammonia (NH3) Niuate Phosphate (PO; as P) Sodium (Nay) <br />Sulfate (SOq) Arsenic (As) Iron (Fe) Lead (Pb) Manganese (Mn) <br />Mercury (Hg) Selenium (Se) Zinc {Zn) Water Level <br />Prior to mining at Lower Wilson, the following three groundwater monitoring sites will be added to the <br />sampling schedule: <br />1. MW-95-01 -Located in the Wilson Creek alluvium, this site represents the upstream, <br />undisturbed background conditions of the alluvial aquifer. <br />2. MW-OS-03 -Located in the Wilson Creek and unnamed drainage alluvium, this site <br />. represents alluvial groundwater quality immediately downgradient from Lower Wilson. <br />South TaylodLower Wilson- Rule 4, Page I S Revision Date: 4/25/07 <br />Revision No.: PR-02 <br />