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0 Surface Water <br />A summary of surface water monitoring sites and sampling history is <br />presented in Table 8. Tables 9a and 9b show the new (2010) surface water <br />parameter lists. 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 one of the new surface water <br />parameter lists during spring runoff and summer baseflow. NPDES <br />Discharge Point 017 was monitored weekly (when accessible by truck) for <br />flow and pH, until a new NPDES permit went into effect on July 1, 2010. <br />It is now monitored monthly. All six NPDES sites are monitored monthly <br />for NPDES parameters and field parameters. Springs are monitored <br />annually (May-July) for flow, field parameters, and, if flow exceeds <br />five gpm (0„011 cfs), one of the new surface water parameter lists. <br />Monitoring frequencies for surface water sites may be found in Table 1 <br />of Appendix 15-3a in 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 mill.iequivalent 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 El. <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 />11