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2.0 HYDROLOGIC MONITORING NETWORK <br />The present monitoring network is a modification of the network used during baseline <br />monitoring. Continuous streamflow records are made for Trout Creek above the mine (TR-a) <br />from May through October (periods of freezing sometimes necessitate the records to be of shorter <br />duration). Instantaneous streamflow was recorded on Trout Creek below the Moffat mining area <br />' at TR-b prior to July 1994. During June 1994, a continuous streamflow recorder was installed at <br />TR-b. Therefore, monitoring data after June 1994 has been collected on the same schedule as at <br />TR-a. Surface water samples are collected above and below the mine at TR-A and TR-D, <br />' respectively. Additional surface water sampling sites along Trout Creek are TR-B (located <br />adjacent to the East Ridge area) and TR-C (located adjacent to the Moffat area). <br />Ground water levels and samples are collected from four wells. Three wells are completed in the <br />alluvium along Trout Creek (TR-1.5, TR-3 and TR-4) and one well is completed in the spoils <br />(WR-1) located at the base of the West Ridge area. An additional water quality well is <br />' completed in the Trout Creek Sandstone (TCS-1) monitored downdip of mining activity. Water <br />monitoring locations are shown on Plate 1. <br />The samples are analyzed for the parameters listed in Table 4.6-54, Section 4.6.8.4 of the permit. <br />Sampling frequency at the various sites is also listed in Table 4.6-54. Parameters measured in <br />the field include: pH, temperature, and specific conductivity. All other parameters measured are <br />' analytically derived at an independent laboratory. <br />The monitoring program has been altered via Technical Revisions 47 and 48. Monitoring wells <br />215W, 215L, 218W, 218L, M892S and M892L were discontinued September 21, 2007 in <br />accordance with TR-47. Monitoring wells TR-1.5, TR-3, TR-4, WR-1 and TCS-1, surface water <br />' flow monitoring sites TR-a and TR-b and surface water quality monitoring sites TR-A, TR-B, <br />TR-C and TR-D were discontinued September 2, 2009 in accordance with TR-48. <br />Page 2 <br />????Y ?YCENGINEERING