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well WWCU25 (both drilled in 2004) displayed the lowest water levels on <br />record in September 2007. Wadge coal well WW25, Sage Creek overburden <br />well WSOV25, Sage Creek coal well WSC25, and Wolf Creek overburden well <br />WWCOV25 (all drilled in 2004) displayed the highest water levels on <br />record in May 2007. <br />Most aquifers at Seneca II-W exhibit a typical seasonal fluctuation. <br />water levels are highest after the spring runoff, which recharges the <br />aquifer. Often, bedrock aquifers exhibit a lag time between spring <br />runoff and highest water levels. water levels then decrease as late <br />summer or fall approaches. <br />Ground Water Quality. Table 3, Summary of Ground Water Monitoring <br />Wells, describes the wells that were sampled, the sample frequency <br />during this year, and site characteristics. Table 4 shows the ground <br />water parameter list used for all wells. Analyses have been performed by <br />ACZ Laboratory in Steamboat Springs, Colorado since May 31, 1983. ACZ <br />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 />4 <br />