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livestock weteri ng. The discussion mentions that ell aquifers st the Seneca 11-V Mine have exhibited several parameter concentrations in excess of both irrigation and livestock • standards compered, rendering them questionable regarding their suitebtl(ty for either irrigation or livestock. All bedrock aquifers affected by mining have been determined to have trensmiseivities less then 1 ft2/day, which would also preclude their use for yielding sufficient water for irrigation, or even livestock. Ground Yater quality Summary. The limited amount of mining that has occurred at this mine (mining began in 1990) has had no effect on ground water quality during the 1994 water year. TDS increases above baseline ranges can be attributed to natural conditions (Yell 15Y). Average TDS values in 1994 were less then the baseline range for Yells 6A2, 140V, 170Y, and 1BOV. Surface Yater At Seneca II-Y, all stream sites are monitored monthly (excluding December to March) for flow and field parameters. Samples obtained et these sites ere analyzed for the surface water parameter list, Table 10 (Appendix A) during April, June, end September. Eight springs ere monitored at Seneca II-Y. They are monitored for flow, field parameters, • and the surface water parameter list semiannually (once in April-June, then again in September-November). A summery of surface water monitoring sites and sampling frequencies is presented in Table 11 (Appendix A). AlL surface water data is found in Appendix E. Discharge monitoring reports. for NPDES 005, 006 and 009 can be fourwi in Appendix F. Dsts for each site begins with a flow hydrograph of all historic data (plus sn annual hydrograph for MPDES cites), followed by a statistical summary of water quality data for the current water year, and then a listing of individual water quality and quantity data for the current water year. Percent milliequivelent values ere presented in Tabl ea 12 and 73 (Appendix A). All date prior to 1990 has been averaged together to provide the baseline (i.e., premining) conditions that existed. In addition, the range of total dissolved solids (TDS) that existed prior to mining is also given. Since mining began in 1990, that data end all subsequent data are listed separately. The following discussion of water quslity will limit itself to s description of major tons. A separate section, Comparison of Surface Veter quslity to 4ater Use Standards, will list those samples that exceed water use elands rds. Leb samples ere handled in a matter identical to whet was discussed ee rl ter in the ground water • 8