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1 <br /> <br />I. Introduction <br />The purpose of this report is to provide updated information on the <br />on-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 />previous seven years. The previous report, dated December 1987, reported <br />'~ monitoring activities up through the end of 1987. <br />Several changes were made to the surface and ground water monitoring <br />programs during 1988. Therefore, this report discusses data for parameters <br />which have been collected on an on-going basis from the period beginning in <br />October 1981 through October, 1988, as well as, additional parameters which <br />have been incorporated into the monitoring programs. <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, and Annual Spring and Seep Survey. A <br />compilation of the raw data is provided in the appendix. <br />II. Hydrologic Monitoring Network <br />t The present monitoring network is a modification of the network used during <br />baseline monitoring. The modifications are mostly simplifications justified <br />by the monitoring records from 1978 through 1987. Continuous streamflow <br />records are made for Trout Creek above the mine (TR-a) from May through <br />' October (periods of freezing sometimes necessitate the records to be of <br />shorter duration). Instantaneous streamflow is recorded on Trout Creek below <br />the proposed 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 (downstream of the <br />active mining area and upstream of the Moffat area) and TR-C (located adjacent <br />to the Moffat area). Sampling at TR-C was started in April of 1985 in <br />anticipation of mining the Moffat area. Ground water samples are collected <br />from three wells completed in the alluvium along Trout Creek (TR-1.5, TR-3 and <br />TR-4) and from a spoils well located at the base of the West Ridge area. <br />1 <br /> <br />