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• appendix. By presenting all historic data, trends related to seasonal <br />and annual variability are more clearly evident. Water level <br />measurements are taken with an electrical water level indicator, or in <br />the case of a few shallow alluvial wells, directly from a steel tape. <br />Site information, including sampling frequencies, is presented in Table <br />3, Summary of Ground Water Monitoring Wells. Ground water level <br />monitoring frequencies are listed in Appendix 15-3a of the Seneca II-W <br />PAP. <br />Ground Water Level Summary. This year, water levels at all wells fell <br />within their historic ranges, with the following exceptions. Hubberson <br />Gulch alluvial wells WHAL6-1, 6-3 and 6-4 exhibited their highest water <br />levels ever this May. Likewise, Sage Creek alluvial wells WSAL12 and 13 <br />also displayed the highest water level on record this May. Wolf Creek <br />underburden well WWCU25 (drilled in 2004) displayed the lowest water <br />levels on record this year. 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 this may. <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 />3