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Table 4. Analyses <br />1903 <br />n <br />Na <br />31 have been performed by ACZ Laboratory in Steamboat Springs, <br />ACZ Laborator <br />EPA or e <br />uivalent <br />erforms <br />ll anal <br />ses b Colorado <br />methods • <br />si <br />y <br />, <br />ce y p <br />. <br />y <br />q <br />y <br />a . <br />Samples are delivered the day of collection to the lab in an iced cooler. A complete <br />description of the ground water monitoring program may be found on pages 7-336 to 7-355 of <br />the Seneca II PAP. <br />The following discussion of the analytical data collected dozing the reporting period is <br />arranged by strata being monitored and coincides xi th the format (by aquifer type) in <br />xhich the analytical data are presented in Appendix C. The discussion of water quality <br />will be limited to a description of total dissolved solids (TDS) concentrations. A <br />separate section, Comparison of Gzound Watez Quality to Water Use Standards, will discuss <br />any samples that exceed rater use atandasds. <br />Data for each well in this appendix begins with a lie ring of the watez quality data <br />collected during this year, followed by remarks explaining the sampling procedure. This <br />~. is followed by a plot of TDS versus time-for the entire period of record. The regression <br />line on this plot,is generated by a me thod. known as LOWE95 (Locally WEighted Scatterplot , <br />Smoothing). A smoothness factor of 1.0 (on a scale of 0 to 1) was used, which results in • <br />maximum "smoothing". Finally, this plot is followed by a table listing historic TD9 <br />values and percent milliequivalente for major ions. <br />- Alluvium. Well 32 is located furthest upstream on Little Grassy Creek. Eeview of the <br />TDS plot indicates an increasing trend. This is due to the contribution of raters from <br />Spoil Springs 3, 4, and 5. Further downstream, Well 6 also displays an increasing TDS <br />trend for similar reasons. Furthest downstream on Little Cressy Creek and below NPDES <br />002, is Well 31A. It also displays an increasing TDS trend. <br />Three wells are sampled in the Grassy Creek alluvium. Well 71 monitors the alluvium <br />upstream of mining at Seneca Ii. It displays an increasing TDS trend. Well 33 monitors <br />the Grassy Creek alluvium at the Little Cressy Creek confluence. It displays an <br />increasing TDS trend. Well 70 monitors the alluvium below Seneca II and also downstream <br />of the confluence wrth Scotchmane Gulch. It interestingly displays a slightly decreasing <br />TDS [rend. <br />In the Caw Camp Creek alluvium (below NPDES 004), water quality is measured at two wells. <br />well 46 displayed an increasing TDS trend until 1986/1907, then a decrease until 1991, and <br />G <br />