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RULE 4 PERFORMANCE STANDARDS <br /> <br />Collom – Rule 4, Page 11 Revision Date: 7/28/21 <br /> Revision No.: MR-237 <br />location is additionally designated as a “Point of Compliance” well for valley fill groundwater monitoring <br />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 Collom <br />Pit. <br />6. Gossard Well – Located within valley fill beneath the rail loop, this site represents the condition of the valley <br />fill aquifer in the vicinity of the Gossard Coal Loadout Facility. <br />7. A-6 Well – Located in the Good Spring Creek valley fill, this site represents the condition up-gradient of and <br />current mining activities. <br />8. North Good Spring Well – Located in the Good Spring Creek valley fill, this site represents the down-dip <br />condition below existing and mining activities. <br />9. MT-95-02 – Located in the Taylor Creek valley fill, this site represents the down-dip condition below current <br />and mining activities. <br />10. A-7 – Located in the West Fork of Good Spring Creek valley fill, this site represents a potential down-dip <br />condition below South Taylor mining activities. <br />11. A-8 - Located in the West Fork of Good Spring Creek valley fill, this site represents the condition up- <br />gradient of South Taylor mining activities. <br />12. Trout Creek Well – Located on the northeastern edge of the Collom Pit, this site respresents the regional <br />aquifer condition of the Trout Creek Sandstone. <br />13. LGSW-1 – Located along Good Spring Creek, this site represents the down gradient condition below mining <br />activities, and is designated as a “Point of Compliance” well for the alluvial aquifer on Good Spring Creek. <br />The applicable standards are the Department of Public Health and Evnironment Water Quality Control <br />Comission Regulation 41 - The Basic Standards for Ground Water, Interim Narrative Standard. How the <br />Interim Narrative Standard will be implemented is described in Volume 2C, Exhibit 7, Item 19, Section 4 and <br />the applicable standards are found in Volume 2C, Exhibit 7, Item 19, Table 16. <br />14. LWCW-1 – Located below the confluence of Wilson and Taylor Creeks, this site respresents the down <br />gradient condition below mining activities and is designated as a “Point of Compliance” well for the alluvial <br />aquifer on Wilson and Taylor Creeks. The applicable standards are the Department of Public Health and <br />Evnironment Water Quality Control Comission Regulation 41 - The Basic Standards for Ground Water <br />Interim Narrative Standard. How the Interim Narrative Standars will be implemented is described in Volume <br />2C, Exhibit 7, Item 19, Section 4 and the applicable standards are found in Volume 2C, Exhibit 7, Item 19, <br />Table 16. <br /> <br />Groundwater Laboratory Parameters <br />pH Conductivity at 25oC Total Dissolved <br />Solids Bicarbonate (HCO3-)D Calcium (Ca+2)D <br />Magnesium (Mg+2)D Ammonia (NH3)D NitrateD Phosphate (PO4-3 as P)D Sodium (Na+)D <br />Sulfate (SO4-2)D Arsenic (As)D Iron (Fe)D Lead (Pb)D Manganese (Mn)D <br />Mercury (Hg)D Selenium (Se)D Zinc (Zn)D <br />D = Dissolved <br /> <br /> <br />Prior to mining at Lower Wilson, the following three valley fill groundwater monitoring sites will be <br />added: <br /> <br />1. MW-95-01 – Located in the Wilson Creek valley fill, this site represents the upstream, <br />undisturbed background conditions of the valley fill aquifer. <br />2. MW-05-03 – Located in the Wilson Creek and unnamed drainage valley fill, this site <br />represents valley fill groundwater quality immediately downgradient from Lower Wilson. <br />3. MW-95-02 – Located in the Wilson Creek valley fill, this site represents the downgradient <br />conditions below Lower Wilson and the haul road. <br /> <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.