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livestock watering. The discussion mentions tDat all aquifers at the Seneca II~N Mina have exhibited aevaral parameter concentrations in excess of both irrigation and livestock standards comyared, rendering them quaetioaable regarding their suitability for eitDar itrigatioa or livestock. All bedrock aquifers affected by mining have been determined to Dave traaemiesivi ti as lase than 1 ft~/day, wbi cD would also preclude their vea for yielding sufficient water for irrigatzoa, or even livestock. Ground Water Quality Summary. TDe limited amount of mining that has occurred at this mice Iminlaq began is 1990) Dee Dad little effect on ground water quality this year. Inereasiaq TDS trends at walls downgradiant of mining axe jus[ beginning to be observed at Wells WHAL7-2, WSAL12, WOV17, and WW14. Agricultural ground water standards for bozos, cDloridea, pA, fluorides, iron, maaganesa, dissolved solids, and sulfates were exceeded at certain monitoring wells. Surface Water AL Seneca II-W, all stream sites are monitored monthly lexcluding November to February) for flow and fielfl parameters. Samples obtained at these sites are analyred for ebe surface water parameter list, Table 9 (Appendix AJ dozing April, Juae, and September. Sight apriaga are monitored at Seneca II~N. They era monitored semiannually (once in April-J•.1ne, tDen again is September-November for flow, field parameters, and, if flow exceeds five gym, the surface water parameter list. A summary of surface water monitoring sltee and sampling history is pres anted in Table 30 (Appendix A1. All surface water data is found in Appendix E. Data fox each site Sa Appendix E begins w1eD a flow DydrograpD of all historic data (plus an annual hydrograph for NPDES sites), followed by a listing of individual water quality and quantity data for the current water year, a TDS Zegression plot using the LDWESS method (see the Ground Water Quallty section), and a listing of historic percent millequivalent valves for major ions and TDS values. The fallowing discussion of water quality will limit itself to a description of TDS treads. A separate section, Comparisob of Surface Watez Quality to Water bse 9tandarde, will list those samples that exceed watez use standards. Lab samples are handled in a matter identical to what was dlscussed earlier in the ground cater section. For the sake of brevity, the prefix that precedes all surface water site names • sill of tae De dropped througDout this report. As as example. Site W9H7 will be referred to ns Sate 7.