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i• <br />Ground Water Quality. Table 4 shows the ground water parameter list <br />used for all well water samples. Appendix C provides all ground water <br />quality data collected during the past two years, along with sampling <br />remarks. After the remarks is a statistic report representing baseline <br />(i.e., premining) data for each well (where applicable). On this <br />statistics report, "censored data" refers to analytical values that were <br />below the detection limit, which were censored from the min/max/mean <br />calculations. The time frame for baseline conditions is listed under <br />"conditions specified" at the bottom of each page. The baseline <br />statistics report is followed by a plot of TDS versus time .for the <br />entire period of record. The regression line on this plot is generated <br />by a method known as LOWESS (Locally Weighted Scatterplot Smoothing). A <br />smoothness factor of 1 (on a scale of 0 to 1) was used, which. gives <br />maximum smoothing. Finally, this plot is followed by a table listing <br />historic TDS values and percent milliequivalents for major ions. <br />• - Alluvium. One well, YAAL19, monitors water quality in the Armand Draw <br />alluvium. TDS values for this well display an increasing trend. <br />Two wells, YGAL15 and 16, monitor water quality in the Grassy creek <br />alluvium, Well 15 is located on Grassy Creek below the confluence of <br />the NPDESII tributary. It displays an increasing TDS trend. Well 16 is <br />located immediately below NPDESII on a Grassy Creek tributary. It <br />displays an increasing TDS trend. <br />Four wells; YSAL1, 3, B, and 12; monitor water quality in the Sage Creek <br />alluvium. Well 1 is the furthest downstream well. It displays an <br />increasing TDS trend. Well 3 is upstream of Well 1, and is located <br />along Sage Creek, just below the discharge from NPDESI2. It displays a <br />slightly increasing TDS trend, but also did so prior to mining. Well 8 <br />is upstream of Well 3, and is upstream of the current mining area. It <br />displays an increasing TDS trend. Well 12 is the furthest upstream <br />well. It displays a level TDS trend. <br />5 <br />