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- Wolf Creek Underburden. Well WWCU25 monitors this stratum in the <br />south area. This well was drilled in September 2004. <br />Ground Water Level Summary. Most aquifers at Seneca II-W exhibit a <br />typical seasonal fluctuation. Water levels are highest after the spring <br />runoff, which recharges the aquifer. Often, bedrock aquifers exhibit a <br />lag time between spring runoff and highest water levels. Water levels <br />then decrease as late surtuner or fall approaches. Well WW18 experienced <br />the lowest water levels on record this year. Well WW14 experienced the <br />highest water levels on record this year. <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 />(on a scale of 0 to 1) was used, which gives maximum smoothing. This <br />5 <br />