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Water Levels. Water levels for all calls that are in the current monitoring program are presented in Appendix C. Hydrographs of all historic data for each well are presented prior to the water level reports (Eor all data since 1991) for each respective well in the same appendix. By presenting all historic data, trends related to seasonal and annual variability are more clearly evident. Water level meaeurementa aze taken with an electrical water level indicator, or in the case of a feu shallow alluvial wells, directly from a steel tape. Si Ce information, Including sampling frequencies, is presented in Table 3, Summary of Ground Water Monitoring Wells. Ground water level moni Goring frequencies are listed on Page 15-3-3 of the Seneca II-W PAP. - Alluvium. The alluvial monitoring Wells WNAL6-1, 6-2, 6-3, 6-4, and 7-2 are loco t¢d along Hubbe rs on Gulch. All walla exhibit water level seasonal variations typical fox the alluvium, i.e., shallot after the spring recharge, deepening towards the fall. Water levels at Wells 6-1 to 6-3 are now higher than they would normally be in May through July due to recently introduced (May, 19H 9) irrigation in that azea. Well WHAL10 ie situated approximately one-half mile donne tream of the NPDES 006 pond on a tributary to Hubberson Gulch. It also exhibits seasonal vaziations typical of previously mentioned monitoring wells. Well WOAL11, situated immediately above the NPDES 005 Pond, is normally dry. Well WSAL12 is ai tuated nett to the lower Sage Creek flume ai to (WBSF3). Well WSAL13 is ei tuated on the northern tributary to Sage Creek (NPDES 009 Gult~h) Well WSAL14 ie located on the southern tributary to Sage Creek belor the proposed NPDES 015 pond. Walls YSAL1, 3, H, and 12 are old Uni tad Stelae Geological Survey alluvial cells eituatad along upper Saga Creek and aze also a part of SCC's Yoaet Mine monitoring netro ck. Most of these rolls ezhibit typical seasonal variations. Seasonal variation at Well YSAL3 is masked by local recharge from adjacent beaver dams in Saga Creek. - Wadga Overburden. Moat of the six Wadga overburden walla exhibit seasonal vaziationa typical of the overburden aquifer (i.e., shallot in the spring or summer, deepening in the fall). Wells 1UV14, 16, and 17 all exhibited an increase in rater levels over the past several years, chile Well WOV18 exhiblted a decrease in rater levels. Wells WOV4-1 and 4- 2 are in the proposed II-W South Expansion area. Monitoring at these tro calla ras . resumed in 1997 after being discontinued in 1985. 3