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RULE 4 PERFORMANCE STANDARDS <br />• 4. MT-95-02 -Located in the Taylor Creek alluvium, this site represents the down-dip condition <br />below current and proposed mining activities. <br />n„arterly Alhwial Ground Water Parameters <br /> <br />pH Conductivity at <br />25°C Total Dissolved <br />Solids Bicarbonate <br />(HC03-) +z <br /> <br />Calcium (Ca ) <br />Magnesium (Mg+z) Ammonia (NH3) Nitrate Phosphate (PO4 <br />as P) Sodium (Na+) <br />Sulfate (SO4) 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 <br />to the sampling schedule: <br />MW-95-O1 -Located in the Wilson Creek alluvium, this site represents the upstream, <br />undisturbed background conditions of the alluvial aquifer. <br />MW-OS-03 -Located in the Wilson Creek and unnamed drainage alluvium, this site <br />represents alluvial groundwater quality immediately downgradient from Lower <br />Wilson. <br />MW-95-02 -Located in the Wilson Creek alluvium, this site represents the <br />downgradient conditions below Lower Wilson and the proposed haul road. <br />It is reasonable to expect potential future monitoring activities for the Lower Wilson locations to <br />mirror those for the existing operation as it pertains to frequency and specific parameters. <br />• Groundwater, Fill Piezometers -The Streeter Draw piezometer and the Section 16 Fill piezometer <br />will be monitored annually for water levels. The West Pit Fill piezometer will be monitored <br />quarterly for water levels. After mining, two additional piezometers will be installed into the toes <br />of East Taylor Fill and West Taylor Fill as described in Exhibit 21 Item 1. These piezometers <br />will be added to the monitoring program. <br />4.05.14 - 4.05.18 Various Topics <br />These sections are addressed in the original permit and will not change with addition of the South <br />Taylor/Lower Wilson permit revision. <br />RULE 2 4.06 TOPSOIL <br />The topsoil removal, storage, and redistribution plan for the proposed disturbed area associated with <br />the Lower Wilson and South Taylor mining areas will follow the procedures described in Section <br />4.06 of the original permit and as described in Section 2.05.3 (5) and 2.05.4 (2) (d) of this South <br />Taylor/Lower Wilson Permit Revision document. <br />J <br />South Taylor/Lower Wilson -Rule 4, Page 19 Revision Date: 6/28/07 <br />Revision No.: MR-88 <br />