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ground water quality may be found in Table 1 of Appendix 15-3a in the <br />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 is <br />limited to a description of total dissolved solids (TDS). A separate <br />section, Comparison of Ground Water Quality to Water Use Standards, will <br />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 which is an acronym for <br />Locally Weighted Scatter Plot Smoothing (Cleveland, 1979). Unless <br />otherwise noted, a smoothness factor (SF) of 1 (on a scale of 0 to 1) <br />was used, which gives maximum smoothing. A statistical report <br />representing baseline (i.e., pre -mining) data for each well (when <br />available) is presented in Appendix D1 of the 2010 AHR. In this <br />statistics report, "censored data" refers to analytical values that were <br />below the detection limit, and consequently 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 />- Alluvium. One well currently monitors the Hubberson Gulch alluvium. <br />Well WHAL7-2 exists on Hubberson Gulch downstream of mine discharges <br />from NPDES 006, 016 and 017. Its TDS plot shows a recent decreasing <br />trend (SF 0.5), with values generally decreasing since May 2005. A <br />discussion of water quality from Dry Creek Alluvial Well DCAL-02 is <br />found in the following Ground Water Point of Compliance Section. <br />- Wadge Overburden. Three wells monitor the Wadge overburden. North <br />area Well WOV14 exhibits an increasing TDS trend. Middle area Well WOV17 <br />overall exhibits a decreasing TDS trend, but with an unusually high <br />5 <br />