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Laboratory performs all analyses by EPA or equivalent methods. Samples <br />are delivered the day of collection to the lab in an iced cooler. <br />Monitoring frequencies for ground water quality may be found in Appendix <br />15-3a of the Seneca II-W PAP. <br />The following discussion of the analytical data collected during the <br />reporting period is arranged by strata being monitored and coincides <br />with the format (by aquifer type) in which the analytical data are <br />presented in Appendix D. The following discussion of water quality will <br />limit itself to a description of total dissolved solids (TDS). A <br />separate section, Comparison of Ground Water Quality to Water Use <br />Standards, will list those samples that exceed water use standards. <br />Data for each well in Appendix D begins with a listing of the water <br />quality data collected during the past two years, followed by remarks <br />explaining the sampling procedure. This is followed by a plot of TDS <br />versus time for the entire period of record. The regression line on this <br />plot is generated by a method known as LOWESS (Locally Weighted Scatter <br />plot Smoothing). Unless otherwise noted, a smoothness factor (SF) of 1 <br />(on a scale of 0 to 1) was used, which gives maximum smoothing. This <br />plot is followed by a table listing historic TDS values and percent <br />milliequivalents for major ions. Finally, a statistical report <br />representing baseline (i.e., premining) data for each well (when <br />available) is presented in Appendix D1. On this statistics report, <br />"censored data" refers to analytical values that were below the <br />detection limit, which were censored from the min/max/mean calculations. <br />The time frame for baseline conditions is listed under "conditions <br />specified" at the bottom of each page. <br />- Alluvium. Three wells monitor the Hubberson Gulch alluvium. Well <br />WHALE-2 is upstream of NPDES 006, but downstream of NPDES 016 and 017, <br />which began discharging in 2001 and 2003. Its TDS plot (SF = 0.5) shows <br />recent decreasing trend. Well WHAL7-2 exists on Hubberson Gulch <br />downstream of mine discharges from NPDES 006, 016 and 017. Its TDS plot <br />shows an overall increasing trend, but values have generally decreased <br />since May 2005. Well WHAL10 exists on 006 Gulch (a Hubberson Gulch <br />4