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Ground Water Quality. <br />Ground water samples were collected from 7 wells on an annual or <br />biannual basis. The parameter lists used for all wells sampled this year <br />are given on Table 4 and ACZ Laboratory (ACZ) in Steamboat Springs, <br />Colorado has performed 4A in Appendix A. Analyses since May 31, 1983. <br />ACZ performs all analyses by EPA or equivalent methods. Samples are <br />delivered the day of collection to the lab in an iced cooler. The PSCM <br />ground water monitoring program may be found on Table 2.04.7-T9, page <br />2.04-104 (Vol. 1) of the PSCM 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 C. The discussion of water quality will be limited <br />to a description of total dissolved solids (TDS) concentrations. A <br />separate section, Comparison of Ground Water Quality to Water Use <br />Standards, will discuss any samples that exceed water use standards. <br />Data for each well in Appendix A begin 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 Locally Weighted Scatter Plot <br />Smoothing (LOWESS) (Cleveland, 1979). Unless otherwise noted, a <br />smoothness factor (SF) of 1.0 (on a scale of 0 to 1) was used, which <br />results in maximum `smoothing". <br />Alluvium. <br />One well is sampled in the Grassy Creek alluvium. Well 70 monitors the <br />alluvium below Seneca II (and the PSCM) and downstream of the confluence <br />with Scotchmans Gulch. Most recently it displays an increasing TDS <br />trend; with the peak TDS value occurring in September 2015. <br />In the Cow Camp Creek alluvium (below NPDES 004 Pond), water quality is <br />measured at one well. Well 69 displays a decreasing TDS trend. <br />R <br />