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1 <br />' I. <br />r 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 1992, reported monitoring <br />' activities up through the end of 1990. This report discusses data for <br />parameters which have been collected on an on-going basis from the period <br />beginning in October 1981 through October, 1992. <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; and Moffat <br />Stability. A compilation of the raw data is provided in the Appendices. <br />1 II. RYDROLOGIC 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 1987. 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 is recorded on Trout Creek <br />below the Moffat mining area at TR-b. Surface water samples are collected <br />above and below the mine at TR-A and TR-D, respectively. Additional surface <br />water sampling sites along Trout Creek are taken at TR-B (upstream of the <br />active mining area and downstream of the West Ridge area) and TR-C (located <br />_ adjacent to the active mining area). Sampling at TR-C was started in April of <br />1985 in anticipation of mining the Moffat area. Ground water samples are <br />collected from three wells completed in the alluvium along Trout Creek (TR- <br />1 1.5, TR-3 and TR-4) and from a spoils well (WR-1) located at the base of the <br />West Ridge area. Ground water levels are collected from six wells (215w, <br />215L, 218w, 218L, M892S and M892L) located in the Moffat area. <br />`i <br />1 <br />) <br />1 <br />