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RULE 4 PERFORMANCE STANDARDS <br />Water <br />Fork Good <br />Total Dissolved <br />Solids <br />Parshall Flume. Volume <br />Parshall Flume. Volume <br />Magnesium (Mg +2)D <br />Spring Creek <br />Nitrate - Nitrite <br />added to EFGSC <br />added to EFGSC <br />Arsenic (As) <br />(LWFGSC)' <br />Mercury (Hg) <br />measurement to apply to <br />measurement to apply to <br />Zinc (Zn) <br />Phosphorus (P) <br />Lead (Pb) <br />actual flow for NUGSC. <br />actual flow for NUGSC. <br />East Fork <br />HCO3 )D <br />Flow Onlv taken from <br />Flow Only taken from <br />Surface <br />Good Spring <br />TR = Total Recoverable <br />Parshall Flume. Volume <br />Parshall Flume. Volume <br />Water <br />Creek <br />Quarterly <br />added to LWFGSC <br />added to LWFGSC <br />(EFGSC)' <br />measurement to apply to <br />measurement to apply to <br />actual flow for NUGSC. <br />actual flow for NUGSC. <br />Upper West <br />Surface <br />Fork Good <br />Quarterly <br />Flow from Parshall <br />Flow from Parshall Flume. <br />Water <br />Spring Creek <br />Flume. See List Below <br />See List Below <br />UWFGSC)4 <br />New Upper <br />See List Below. Flow <br />See List Below. Flow <br />Surface <br />Good Spring <br />Quarterly <br />estimated by combining <br />estimated by combining <br />Water <br />Creek <br />measurements taken from <br />measurements taken from <br />(NUGSC)' <br />LWFGSC & EFGSC. <br />LWFGSC & EFGSC. <br />Surface <br />Lower Good <br />Spring Creek <br />Quarterly <br />Flow from Parshall <br />Flow from Parshall <br />Water <br />(LGSC <br />Flume. See List Below <br />F1ume.See List Below <br />1. Lower Taylor Creek (LTC) represents the water quality conditions of Taylor Creek directly downstream of the <br />South Taylor mining area and immediately prior to the confluence with Wilson Creek and immediately <br />downstream of the Gossard Loadout. <br />2. Lower West Fork Good Spring Creek ( LWFGSC) represents this tributary after potential impacts caused by <br />South Taylor mining. <br />3. East Fork Good Spring Creek (EFGSC) represents the upstream, undisturbed background condition of the East <br />Fork Good Spring Creek. <br />4. Upper West Fork Good Spring Creek ( UWFGSC) represents the upstream, undisturbed background condition of <br />the West Fork Good Spring Creek. <br />5. New Upper Good Spring Creek (NUGSC) represents the water quality of Good Spring Creek downstream of the <br />confluence of the east and west forks of the creek and downstream of the South Taylor mining area. <br />6. Lower Good Spring Creek (LGSC) represents the water quality downstream of the South Taylor and existing <br />mining areas. <br />Temperature I Flow I pH I Conductivity <br />Ouarterlv Surface Water Laboratory Parameters <br />pH <br />Conductivity @ 25 °C <br />Total Dissolved <br />Solids <br />Total Suspended Solids <br />Calcium (Ca+2)u <br />Magnesium (Mg +2)D <br />Ammonia (NH3) <br />Nitrate - Nitrite <br />Sodium (Na +) <br />Sulfate (SO4) <br />Arsenic (As) <br />Iron - Total <br />Mercury (Hg) <br />Manganese (Mn) <br />Selenium (Se) <br />Zinc (Zn) <br />Phosphorus (P) <br />Lead (Pb) <br />Bicarbonate <br />HCO3 )D <br />D = Dissolved <br />TD = Total Dissolved <br />T = Total <br />TR = Total Recoverable <br />Prior to mining at Lower Wilson, the following three surface water monitoring sites will be added to the <br />sampling schedule: <br />South Taylor /Lower Wilson — Rule 4, Page 1 I Revision Date: 12/18/13 <br />Revision No.: MR -129 <br />