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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 />- Alluvium. The alluvial monitoring Wells WHAL6-1, 6-2, 6-3, 6-4, and <br />7-2 are located along Hubberson Gulch. All wells exhibit water level <br />seasonal variations typical for the alluvium, i.e., shallow after the <br />spring recharge, deepening towards the fall. Well WHAL10 is located <br />approximately one-half mile downstream of the NPDES 006 pond on a <br />tributary to Hubberson Gulch. It also exhibits seasonal variations <br />typical of previously mentioned monitoring wells. Water levels observed <br />this year for most of these wells fell within their historic ranges. <br />Water levels at Wells 6-1 and 6-2 were the lowest on record. <br /> <br />Well WDAL11, located immediately above the NPDES 005 Pond, is normally <br />dry. Well WSAL12 is located next to the lower Sage Creek flume site (SW- <br />S2W-FG4). Well WSAL13 is located on the northern tributary to Sage Creek <br />below the NPDES 009 Pond. Well WSAL14 is located on the southern <br />tributary to Sage Creek below the NPDES 015 Pond. Most of these wells <br />exhibit typical seasonal variations. Water levels observed this year for <br />most of these wells fell within their historic ranges. Well WSAL12 <br />exhibited the lowest water level on record, while WSAL12 displayed its <br />highest water level ever in May, right after a heavy snowfall melt. <br />Wadge Overburden. Most of the six Wadge overburden wells monitored <br /> exhibit seasonal variations typical of the overburden aquifer (i.e., <br /> shallow in the spring or summer, deepening in the fall) . Wells WOV14, <br /> 16, and 17 all exhibited an increase in water levels over since 1996. <br /> Water levels observed this year for all these wells fell within their <br /> historic ranges. Well WOV18 has exhibited a decrease in water levels <br /> since 1998. Wells WOV4 -1 and 4-2 were in the II-W South Expansion area. <br /> Monitoring at these two wells was resumed in 1997 after being <br />3 <br />