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RULE 4 PERFORMANCE STANDARDS <br /> <br />Collom – Rule 4, Page 9 Revision Date: 3/20/24 <br /> Revision No.: MR-254 <br />Water Good Spring <br />Creek <br />(EFGSC)8 <br />Parshall Flume. Volume <br />added to LWFGSC <br />measurement to apply to <br />actual flow for NUGSC. <br />Parshall Flume. Volume <br />added to LWFGSC <br />measurement to apply to <br />actual flow for NUGSC. <br />Surface <br />Water <br />Upper West <br />Fork Good <br />Spring Creek <br />(UWFGSC)9 <br />Quarterly Flow from Parshall <br />Flume. See List Below <br />Flow from Parshall Flume. <br />See List Below <br />Surface <br />Water <br />New Upper <br />Good Spring <br />Creek <br />(NUGSC)10 <br />Quarterly <br />See List Below. Flow <br />estimated by combining <br />measurements taken from <br />LWFGSC & EFGSC. <br />See List Below. Flow <br />estimated by combining <br />measurements taken from <br />LWFGSC & EFGSC. <br />Surface <br />Water <br />Lower Good <br />Spring Creek <br />(LGSC)11 <br />Quarterly Flow from Parshall <br />Flume. See List Below <br />Flow from Parshall Flume. <br />See List Below <br /> <br />1. Upper Collom Gulch (UCG) represents the water quality conditions in Collom Gulch upstream of the Collom <br />Lite mining area. No impact on flow or water quality at UCG is anticipated. <br />2. Lower Collom Gulch (LCG) represents the conditions in Collom Gulch downstream of mining impacts. No <br />impact on flow or water quality at UCG is anticipated. <br />3. Lower Little Collom Gulch (LLCG) represents the conditions in Little Collom Gulch downstream of all <br />mining disturbances. Because Little Collom Gulch is ephemeral, and the mining area extends nearly to the <br />headwaters, no upstream monitoring location can be established. <br />4. West Fork of Jubb Creek (WFJC) represents conditions in the Jubb Creek watershed adjacent to the mining <br />disturbance. <br />5. Confluence of Jubb Creek (CJC) represents the aggregate water quality in the Jubb Creek basin, downstream <br />of potential mining impact areas. <br />6. Lower Taylor Creek (LTC) represents the water quality conditions of Taylor Creek directly downstream of <br />the South Taylor mining area and immediately prior to the confluence with Wilson Creek and immediately <br />downstream of the Gossard Loadout. <br />7. Lower West Fork Good Spring Creek (LWFGSC) represents this tributary after potential impacts caused by <br />South Taylor mining. <br />8. East Fork Good Spring Creek (EFGSC) represents the upstream, undisturbed background condition of the <br />East Fork Good Spring Creek. <br />9. Upper West Fork Good Spring Creek (UWFGSC) represents the upstream, undisturbed background <br />condition of the West Fork Good Spring Creek. <br />10. New Upper Good Spring Creek (NUGSC) represents the water quality of Good Spring Creek downstream of <br />the confluence of the east and west forks of the creek and downstream of the South Taylor mining area. <br />11. Lower Good Spring Creek (LGSC) represents the water quality downstream of the South Taylor and existing <br />mining areas. <br /> <br />Quarterly Surface Water Field Parameters <br />Temperature Flow pH Conductivity <br /> <br />Quarterly Surface Water Laboratory Parameters <br /> <br />pH Conductivity @ 25oC Total Dissolved <br />Solids Total Suspended Solids <br />Calcium (Ca+2)D Magnesium (Mg+2)D Ammonia (NH3)D Nitrate-NitriteD <br />Sodium (Na+)D Sulfate (SO4-)D Arsenic (As)TR Iron - TotalT <br />Mercury (Hg)T Manganese (Mn)TR Selenium (Se)TR Zinc (Zn)TR <br />Phosphorus (P)T Lead (Pb)TR Bicarbonate <br />(HCO3)D <br /> <br />D = Dissolved <br />T = Total