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EFCI's monitoring program for the Southfield Mine addresses four (4) specific areas: <br />• o Surface Water Flows in the Ephemeral Drainages of Magpie, Newlin, <br />Second Alkali, and Oak Creeks <br />o Surface Water Discharges from Sedimentation Ponds <br />o Ground Water in a Series of Monitoring Wells <br />o Ground Water Inflows and Dewatering from Active Workings <br />Each component of the hydrologic monitoring program reflects different characteristics <br />and intervals of flow. Consequently, the Southfield monitoring program has been <br />designed to provide an effective record of hydrologic conditions and identify any <br />changes in the noted hydrologic systems. EFCI will collect surface water quality <br />samples and take flow measurements on both Newlin and Oak Creeks. Upstream and <br />downstream monitoring will be performed concurrently, on a quarterly basis, when <br />surface flow is present. <br />Since Magpie Creek is tributary to Newlin Creek and flows in response to snowmelt <br />and storm runoff, the primary hydrologic information of relevance for Magpie Creek is <br />peak runoff rates. Accordingly, EFCI will install crest gages adjacent to the Magpie <br />. Creek diversion in order to measure peak flows at the upstream and downstream <br />monitoring locations. With the exception of flows in Magpie Creek resulting from <br />discharge of pond dewatering flows, EFCI will monitor and record crest stage readings <br />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 at its single monitoring location. <br />EFCI will establish a crest gage on Second Alkali Creek to permit ongoing monitoring <br />of peak flows. <br />All surface monitoring sites are shown on Mine Area Surface and Groundwater <br />Hydrology Map, (Map 12) and the Loadout Area Surface and Groundwater Hydrology <br />Map, (Map 13). <br />Ground water within the mine area will be monitored and sampled at five (5) ground <br />water monitoring wells. The locations of these wells are shown on the Mine Area <br />Surface and Groundwater Hydrology Map, (Map 12). <br />2.05.6 - 52 Revised 02/16/01 <br />Technical Revision No. 29 <br />