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I. INTRODUCTION <br />The purpose of this report is to provide updated information pertaining to the on-going <br />hydrologic monitoring program developed for the Edna Mine and discuss trends in surface <br />and ground water quality which have become evident over the past decade. The previous <br />report, dated February 2006, reported monitoring activities up through the end of 2005. This <br />report discusses data for parameters which have been collected on an on-going basis for the <br />period 1997 through 2006. <br />The report is divided into several sections including: Hydrologic Monitoring Network; <br />Surface Water; Ground Water; Surface Water-Ground Water Interactions; Quality Assurance; <br />Annual Spring and Seep Survey; Moffat Stability; and Trout Creek Sandstone. A compilation <br />of the raw data is provided in the Appendices. <br />II. 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 <br />shorter duration). Instantaneous streamflow was recorded on Trout Creek below the Moffat <br />mining area at TR-b prior to July 1994. During June 1994, a continuous streamflow recorder <br />was installed at TR-b. Therefore, monitoring data after June 1994 has been collected on the <br />same schedule as at TR-a. Surface water samples are collected above and below the mine at <br />TR-A and TR-D, respectively. Additional surface water sampling sites along Trout Creek are <br />TR-B (located adjacent to the East Ridge area) and TR-C (located adjacent to the Moffat <br />area). Ground water levels and samples are collected from three wells completed in the <br />alluvium along Trout Creek (TR-1.5, TR-3 and TR-4) and from a spoils well (WR-1) located <br />at the base of the West Ridge area. Additional ground water levels are collected from six <br />wells (215W, 215L, 218W, 218L, 8925 and 892L) located in the Moffat area. Finally, the <br />Trout Creek Sandstone water quality is monitored downdip of mining activity via samples <br />taken from Well TCS-1. All of the monitoring sites are shown on Exhibit 4.6-26 of the permit <br />