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TABLE 61 <br />KERR AREA HYDROLOGIC MONITORING SCHEDULE <br />WATER QUALITY — PART 1 <br />Constituent <br />Surface <br />Discharge <br />Points <br />Alluvial <br />Wells <br />Temperature (field) <br />M <br />M <br />pH (field) <br />M <br />M <br />Elec. Cond. (field) <br />M <br />Oil and Grease (vis) <br />re <br />Settleable Solids <br />NAM <br />Total Dissolved Solids <br />Q <br />Iron <br />Q <br />Manganese <br />Q <br />Sulfate <br />Q <br />- <br />Carbonate <br />Q <br />Bicarbonate <br />Q <br />Potassium <br />Q <br />Calcium <br />Q <br />Magnesium <br />Q <br />Sodium <br />Q <br />S.A.R. <br />Q <br />Chloride <br />Q <br />Nitrate- Nitrogen <br />Q <br />WATER QUANTITY — PART 2 <br />Monitoring Facility <br />Measurement <br />Accuracy <br />Weekly/Monthly <br />Surface Discharge <br />Points <br />Flow (Water Depth <br />in Wier or Flume) <br />0.01 ft <br />Weekly/Monthly <br />Sediment Ponds <br />Sediment Level in <br />Pond <br />0.1 ft <br />Quarterly <br />Alluvial Wells <br />WATER UNE <br />OA FT <br />Monthly <br />Notes: <br />(1) Not monitored at Site 320 <br />• Monthly (M) — monitored monthly during March through October <br />• Quarterly (Q) — monitored quarterly during April through October <br />• Semi - annually — monitored twice per year <br />Surface Discharge Points — — 319 and 320 (Loadout) <br />Alluvial Wells — - AP -1 and AP -2 ( Loadout) <br />vis = visual check for oilgrease <br />GEp.seo <br />Note: As of the approval of TR -23, monitoring as scheduled in this table-will-eerie for all wells and surface water <br />discharge points associated with the mine. Those associated with the Loadout will continue as scheduled. <br />TR -23 (6.PPRovEO) <br />Revised May 2007 <br />