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• 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 summer or fall approaches. Well WOV18 experienced <br />the lowest water level on record this year. Wells WW17 and WWC17 <br />experienced the highest water levels on record this year. _ <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 9 shows the ground water , <br />parameter list used for all wells. Analyses have been performed by ACZ ~ . <br />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. After the remarks is a statistic <br />report representing baseline (i.e., ptemining) data for each well (when <br />available). On this statistics report, "censored data" refers to <br />analytical values that were below the detection limit, which were <br />censored from the min/mar/mean calculations. The time frame for <br />baseline conditions is listed under "conditions specified" at the bottom <br />of each page. This is followed by a plot of TDS versus time for the <br />entire period of record, The regression line on this plot is generated <br />5 <br />