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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 for flow and field parameters (flow, temperature, <br />pH, and electrical conductivity) and the surface water parameter list, <br />Table 8, during April, June, and September. NPDES Discharge Point 017 is <br />monitored weekly (when accessible by truck) for flow and pH. All five <br />NPDES sites are monitored monthly for NPDES parameters and field <br />parameters. Springs are monitored annually (April-June) for flow, field <br />parameters, and, if flow exceeds five gpm (0.011 cfs), the surface water <br />parameter list. Monitoring frequencies for surface water sites may be <br />found in Appendix 15-3a of the Seneca II-W PAP. <br />All surface water data is found in Appendix E. 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 />Water Quality to Water Use Standards, will list those samples that <br />exceed water use standards. Lab samples are handled in a matter <br />identical to what was discussed earlier in the ground water section. For <br />the sake of brevity, the prefix that precedes all surface water site <br />names will often be dropped throughout this report. As an example, Site <br />SW-S2W-SG7 (WSH7) will be referred t.o as Site 7. <br />12 <br />