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WSAL12 experienced the lowest water levels on record this year. We11s <br />WW17 and WWC17 experienced the highest water levels on record this year. <br />i <br />Water Quality. Table 3, Summary of Ground Water Monitoring Wells, <br />describes the wells that were sampled, the sample frequency during this <br />year, and site characteristics. Table 4 shows the ground water parameter <br />list used for all wells. Analyses have been performed by ACZ Laboratory <br />in Steamboat Springs, Colorado since may 31, 1983. ACZ Laboratory <br />performs all analyses by EPA or equivalent methods. Samples are <br />delivered the day of collection to the lab in an iced cooler. Monitoring <br />frequencies for ground water quality may be found in Appendix 15-3a of <br />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) . A smoothness factor of 1 (on a scale of 0 to 1) was <br />used, which gives maximum smoothing. This plot is followed by a table <br />listing historic TDS values and percent milliequivalents for major ions. <br />Finally, a statistical report representing baseline (i.e., premining) <br />data for each well (when available) is presented in Appendix D1. 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. <br />5 <br />