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<br />Ground Water <br />Water Levels. Water levels for all wells that are in the current <br />monitoring program are presented in Appendix C. Hydrographs of all <br />historic data for each well are presented prior to the water level <br />reports (for all data since 2004) for each respective well in the same <br />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. Wolf Creek <br />underburden well WWCU25 displayed the lowest water levels on record this <br />year. Wadge overburden well WOV25, Wadge coal wells WW17 and WW25, Sage <br />Creek overburden well WSOV25, Wolf Creek overburden well WWCOV25 and <br />Wolf Creek coal well WWC25 all displayed the highest water levels on <br />record this May. All W-25 series wells were drilled in 2004 and exist in <br />the south pit area downgradient of the last mining area at this mine. <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 />3