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• Ground Rater Quality S'•^^-~. Mining that has occurred et Semena II-R hoe had little effect on ground rater quality this yeaz. Incraseinq TD9 trends at calls dorngtsdiant of mining are just beginning to be observed at Rolls RHN.7-2, RSAL12, ROy17, and RR16. Agricultural ground rater etandazds !or boron, chlorides, icon, manganese, molybdenum, diseolwd solids, and sulfates rare ezceade6 at caztain monitoring cells. Surface Rater At Seneca II-R, all stream cites aze monitored monthly (excluding November to February) for floc and field pazametars. Samples obtained at theca Bites aza analysed for the surface rates pazametar list, Table 9 (Appendiz A) during April, June, and September. Eight epringa are monitored at Seneca II-R. They are monitored semiannually (once in April-June, then aqua in September-November for floc, field pazemetere, and, if floc exceeds !iw gpm, the surface rater pazameter list. A e••^^^--y of surface rater monitoring cites and sampling history is presented in Table 10 (Appendiz A). Monitoring fxequenciae Por surface rater cites may be found on Paga 15-3-2 of the Sanaca II-R PAP. All suriaca rater data ie found in Appendix E. Data for each vita in Appendix B begins rith a floc hydrograph of all historic data (plus an annual hydrograph for NPDES eitea), follorad by a listing of individual rater quality and quantity data !or the current rater yeaz, a TDS ragraeeion plot using the LORESS method (sae the Ground Rater Quality section), and a listing of hiatoxic percent milliaquivalent values !or major ions and TDS values. The range of valves on the TDS plots ie set automatically by n computer program sad cannot be user defined. The follorinq discussion of rater quality rill limit itself to a Qaseription of TDS trends. A eapazata section, Compazieoa o! Surface Rater Quality to Rater Uea Standazds, rill list those samples that azcaed rates use atmdazds. Lab samples aze handled in n metier identical to rhst was discussed eazlier in the ground rater section. For the sake of Dxavity, the pratiz that precedes sll surface rater site names rill often be dropped throughout this report. As an azampla, Site RSS7 rill be referred to ae Site 7. Surface Rntar Sita SR-SZW-SC7 (RSS7). This cite is located on Hubbarson Culch upstream o! the confluence o! mina diechazgae contained in 006 Culeh. Its purpose is to provide • undisturbed rater quality data. Monitoring here begin in April 1987. Eevier o! its