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. preclude their use for yielding sufficient water for irrigation, or even <br />livestock. <br />• <br />Surface Water <br />A summary of surface water monitoring sites and sampling history is <br />presented in Table 7. At Seneca II-W, all stream sites (unless otherwise <br />noted) are monitored monthly (excluding November to February) for flow <br />and field parameters (flow, temperature, pH, and electrical <br />conductivity). NPDES Discharge Points 015, 016 and 017 are monitored <br />weekly (when accessible by truck) for flow and pH. All five NPDES sites <br />are monitored monthly for NPDES parameters and field parameters. Samples <br />obtained at all NPDES and stream sites are analyzed for the surface <br />water parameter list, Table 8, during April, June, and September. <br />Springs are monitored semiannually (once in April-June, then again in <br />September-November) for flow, field parameters, and, if flow exceeds <br />five gpm (0.011 cfs), the surface water parameter list. Monitoring <br />frequencies for surface water sites may be found in Appendix 15-3a of <br />the Seneca II-W PAP. <br />All surface water data is found in Appendix 8. Data for each site begins <br />with a flow hydrograph of all historic data (plus an annual hydrograph <br />for NPDES sites), followed by a listing of individual water quality and <br />quantity data for the current water year, and followed by remarks if <br />present. This is followed by a TDS regression plot using the LOWESS <br />method (see the Ground Water Quality section), and a listing of historic <br />percent milliequivalent values for major ions and TDS values. A <br />statistical report representing baseline (i.e., premining) data for each <br />site downstream of mining (when available) is provided in Appendix E1. <br />On this statistics report, "censored data" refers to analytical values <br />that were below the detection limit, which were censored from the <br />min/max/mean calculations. The time frame for baseline conditions is <br />listed under "conditions specified" at the bottom of each page. <br />• The following discussion of water quality will limit itself to a <br />description of TDS trends. A separate section, Comparison of Surface <br />13 <br />