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It - Sage Creek Coal. Well WSC25 monitors this seam in the south area. This well was drilled in September 2004. - Wolf Creek Overburden. Well WWC0V25 monitors this stratum in the south area. This well was drilled in September 2004. - Wolf Creek Coal. Well WWC3 has exhibited a decrease in water levels since 1997, but this year water levels are still within its historic range. Water levels at Well WWC17 have been on the increase since 2000, but this year water levels are still within its historic range. Well WWC25 monitors this seam in the south area. This well was drilled in September 2004. - Wolf Creek Underburden. Well WWCU25 monitors this stratum in the south area. This well was drilled in September 2004. Ground Water Level Summary. Most aquifers at Seneca II-W exhibit a typical seasonal fluctuation . Water levels are highest after the spring runoff, which recharges the aquifer . Often, bedrock aquifers exhibit a lag time between spring runoff and highest water levels. Wa ter levels then decrease as late summer or fall approaches. Wells WSAL13, W0V18 and WW18 experienced the lowest water le vels on record this year. Well W0V14 experienced the highest water levels on record this year. Ground Water Quality. Table 3, Summary of Ground Water Monitoring Wells, describes the wells that were sampled, the sample frequency during this year, and site characteristics. Table 4 shows the ground water parameter list used for all wells. Analyses have been performed by ACZ Laboratory in Steamboat Springs, Colorado since May 31, 1983. ACZ Laboratory performs all analyses by EPA or equivalent methods. Samples are delivered the day of collection to the lab in an iced cooler. Monitoring frequencies for ground water quality may be found in Appendix 15-3a of the Seneca II-W PAP, . The following discussion of the analytical data collected during the reporting period is arranged by strata being monitored and coincides 5