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• I. INTRODUCTION <br />The purpose of this report is to provide updated information pertaining to 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 past <br />decade. The previous report, dated February 1997, reported monitoring activities up <br />through the end of 1996. This report discusses data for parameters which have been <br />collected on an on-going 'oasis for the period 1988 through 1997. <br />The report is divided into several sections including: Hydrologic Monitoring <br />Network; Surface Water; Ground Water; Surface Water-Ground Water Interactions; <br />Quality Assurance; Annual Spring and Seep Survey; Moffat Stability; and Trout Creek <br />Sandstone. A compilation of the raw data is provided in the Appendices. <br />II. }iYDROLOGIC MONITORING NETWORK <br />The present monitoring network is a modification of the network used during <br />baseline monitoring. Continuous streamflow records are made for Trout Creek above <br />the mine (TR-a) from May through October (periods of freezing sometimes necessitate <br />the records to be of shorter duration). Instantaneous streamflow was recorded on <br />• Trout Creek below the Moffat mining area at TR-b prior to July 1994. During June <br />1994, a continuous streamflow recorder was installed at TR-b. Therefore, monitoring <br />data after June 1999 has been collected on the same schedule as at TR-a. Surface <br />water samples are collected above and below the mine at TR-A and TR-D, respectively. <br />Additional surface water sampling sites along Trout Creek are TR-B (located adjacent <br />to the East Ridge area) and TR-C (located adjacent to the Moffat area). Ground <br />water levels and samples are collected from three wells completed in the alluvium <br />along Trout Creek (TR-1.5 TR=3 an~) and from a spoils well (WR-1) located at <br />the base of the West Ridge area. Additional ground water levels are collected from <br />six wells (215W, 215L, 218W, 216L, 8925 and B92L) located in the Moffat area. <br />Finally, the Trout Creek Sandstone water quality is monitored downdip of mining <br />activity via samples taken from Well TCS-1. All of the monitoring sites are shown <br />on Exhibit 9.6-26 of the permit document. <br />WATER QUALITY ANALYSES AND SAMPLING FREQUENCY <br />The samples are analyzed for the parameters listed in Table 9.6-59, Section <br />4.6.8.9 of the permit. Sampling frequency at the various sites is also listed in <br />Table 9.6-54. Parameters measured in the field include: pH, temperature, and <br />• specific conductivity. All other parameters measured are analytically derived at an <br />independent laboratory. Surface water data are contained in Appendix A and ground <br />water data are contained in Appendix B. <br />1 <br />