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EFCI's monitoring program for the Southfield Mine addresses four (4) specific <br />areas: <br />• Surface Water Flows in the Ephemeral Drainages of Magpie, Newlin, <br />Second Alkali, and Oak Creeks <br />• Surface Water Discharges from Sedimentation Structures <br />• Groundwater in a Series of Monitoring Wells <br />• Groundwater Inflows and Dewatering from Active Workings <br />Each component of the hydrologic monitoring program reflects different <br />characteristics and intervals of flow. Consequently, the Southfield monitoring <br />program has been designed to provide an effective record of hydrologic <br />conditions and identify any changes in the noted hydrologic systems. EFCI will <br />collect surface water quality samples and take flow measurements on both <br />Newlin and Oak Creeks on asemi-annual basis. <br />Since Magpie Creek is tributary to Newlin Creek and flows only in response to <br />snowmelt and storm runoff, the primary hydrologic information of relevance for <br />Magpie Creek is peak runoff rates. Accordingly, EFCI will monitor and sample <br />flows on a daily basis at any time significant flows occur in Magpie Creek. <br />As an ephemeral stream, monitoring procedures for Second Alkali Creek will be <br />essentially the same as discussed for Magpie Creek. EFCI will monitor and sample <br />flows on an opportunistic basis at any time significant flows occur in Second Alkali <br />Creek. <br />All surface monitoring sites are shown on Mine Area Surface and Groundwater <br />Hydrology Map, (Map 12), the Loadout Area Surface and Groundwater Hydrology <br />Map, (Map 13), and the Southfield Reclamation Plan Map (Map 33). <br />Groundwater within the mine area will be monitored and sampled at four (4) <br />groundwater monitoring wells. The locations of these wells are shown on the <br />Mine Area Surface and Groundwater Hydrology Map, (Map 12) and the Southfield <br />Reclamation Plan Map (Map 33). <br />MR-50 2.05.6-52 Revised -June 2003 <br />