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<br />I. ZNTRODVCTION <br />The purpose of this report is to provide updated information on the on- <br />going hydrologic monitoring program developed for the Edna Mine and discuss <br />trends in surface and ground water quality which have become evident over the <br />past decade. The previous report, dated February 1995, reported monitoring <br />activities up through the end of 1994. This report discusses data for <br />parameters which have been collected on an on-going basis from the period <br />beginning in January 1986 through December 1995. <br />The report is divided into several sections including: Hydrologic <br />Monitoring Network; Surface Water; Ground Water; Surface Water - Ground Water <br />Interactions; Quality Assurance; Annual Spring and Seep Survey; Moffat <br />Stability; and Trout Creek Sandstone. A compilation of the raw data is <br />provided in the Appendices. <br />. II. HYDROLOGIC MONITORING NETWORK <br />The present monitoring network is a modification of the network used <br />during baseline monitoring. The modifications are mostly simplifications <br />justified by the monitoring records from 1978 through 1997. Continuous <br />streamflow records are made for Trout Creek above the mine (TR-a) from May <br />through October (periods of freezing sometimes necessitate the records to be <br />of shorter duration). Instantaneous streamflow was recorded on Trout Creek <br />below the Moffat mining area at TR-b prior to July 1994. During June 1994, a <br />continuous streamflow recorder was installed at TR-b. Therefore, monitoring <br />data subsequent to June 1994 is provided on the continuous schedule as at TR- <br />a. Surface water samples are collected above and below the mine at TR-A and <br />TR-D, respectively. Additional surface water sampling sites along Trout Creek <br />are TR-B (upstream of the most recent active mining area and downstream of the <br />West Ridge area) and TR-C (located adjacent to the most recent active mining <br />area). Ground water Levels and samples are collected from three wells <br />completed in the alluvium along Trout Creek (TR-1.5, TR-3 and TR-4) and from a <br />spoils well (WR-1) located at the base of the West Ridge area. Additional <br />• ground water levels are collected from six wells (215W, 215L, 218W, 218L, 8925 <br />and 892L) located in the Moffat area. Finally, the Trout Creek Sandstone <br />1 <br />