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<br />' 1. INTRODUCTION <br />' The purpose of this report is to provide updated information pertaining to the on-going hydrologic monitoring <br />program developed far the Edna Mine and discuss trends in surface and ground water quality which have become evident <br />' over the past decade. The previous report, dated February 2000, reported monitoring activities up through the end of 1999. <br />This report discusses data fur parameters which have been collected an an on-going basis for the period 1991 through 2000. <br />' The report is divided into .eeveral sections including: Hydrologic Moniroring Network; Surface Water; Ground <br />Water; Surface Water-Ground Water Interactions; Quality Assurance; Annual Spring and Seep Survey; Moffat Stability; and <br />Trout Creek Sandstone. A compilation of the raw data is provided in the Appendices. <br />11. HYDROLOGIC MONITORING NETWORK <br />' The present monitorin, network is a modification of the network used during baseline monitoring. Continuous <br />streamflow records are made for Trout Creek above the mine (TR-a) from May throueh October (periods of freezing <br />sometimes necessitate the records to be of shorter duration). Instantaneous streamFlow was recorded un Trout Creek below <br />the Moffat mining area al TR-b prior to July 1994. During June 1994, a continuous s[reamtlow recorder was installed at TR- <br />' b. Therefore, moniroring data after June 1994 has been collected on the same schedule as at TR-a. Surface water samples' are <br />collected above and below the mine at TR-A and TR-D, respectively. Additional surface water sampling sites along Trout <br />' Creek are TR-B (located adjacent to the East Ridge area) and TR-C (located adjacent to the Moffat area). Ground water <br />levels and samples are collected from three wells completed in the alluvium along Trout Creek (TR- L5, TR-3 and TR-4) and <br />' from a spoils well (WR-I) located at the base of the West Ridge urea. Additional ground water levels are collected from six <br />wells (215W. 215L, 21RW, 218L, 8925 and 892L) located in the Moffat area. Finally, the Trout Creek Sandsmne water <br />' quality is monitored downdip of mining activity via samples taken from Well TCS-I. All of the monitoring sites are shown <br />on Exhibit 4.6-26 of the permit document. <br />' WATER QUALITY ANALYSES AND SAMPLING FREQUENCY <br />' The samples are analyzed far the parameters listed in Table 4.6-54. Section 4.6.8.4 of the permit. Sampling <br />frequency at the various sites is also listed in Table 4.6-54. Parameters measured in the field include: pH. temperature, and <br />' specific conductivity. All other parameters measured are analytically derived at an independent laboratory. Surface water <br />data are contained in Appendix A and ground water data are contained in Appendix B. <br />III. SURFACE WATER <br />GAUGING STATIONS <br />' Figure 1 shows the cominuous streamtlow records for Trove Creek at TR-a and TR-b. The graphs showing the <br />' results of the gauging stations along Trout Creek indicate that the monitoring program is being placed an-line early enough in <br />