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monitoring began. Welt 21A is situated next to [he lower Sage Creek flume site <br />(SW-S2W-FC4). Wells 22A and 23A ere situated on tributaries to Sage Creek (NPDES 009 and <br />proposed MPDES 010 drainages, respectively). Wells USGS A1, A3, AB and A12 are old United <br />States Geological Survey alluvial wells situated along upper Sage Creek and are also a <br />part of PWCC~s proposed Yoast Mine monitoring network. 4ater level measurements for all <br />eight wells are required twice a year (most wells et Seneca 11-W are measured five times a <br />year). Due to this, water level measurements for seven of those eight wells (all except <br />Well 21A) are provided only along with their water quality reports (Appendix D). Wells <br />22A, 23A, end USGS A1, AB and A12 all exhibit typical seasonal variations. Seasonal <br />variation at Well USGS A3 is masked by local recharge from ponded water in Sage Creek <br />created by adjacent beaver dams. Due to its strategic Location (i.e., next to the loner <br />Sage Creek flume), a hydro9raph end water level report for Well 21A is also provided <br />in Appendix C. It also exhibits typical seasonal variation. <br />Wadge Overburden. Most Wadge overburden wells (unless noted) exhibit seasonal variations <br />typical of the overburden aquifer (i.e., shallow in the spring or summer, deepening in the <br />fall). Welt 110V exhibited its lowest water level ever (63.96 feet on October 26, 1992) <br />as a result of dewatering by an adjacent mine pit. This well was removed by mining by <br />March of 1993. Well 140V exhibited its highest water levels ever, likely as a result of <br />high snowpack runoff and an open mine pit updip of this well which acts as a recharge <br />area. Wells 150V and 170V exhibited higher water levels this year than in the previous <br />five years, also as a result of high snowpack runoff. Well 160V exhibits very little <br />seasonal or annual variations. Well 180V has exhibited a Long-term decreasing water level <br />trend in the previous five years, but water levels are shallower this year. <br />Wadge Coal. Wadge coal wel Ls exhibit the same typical seasonal variations (unless <br />otherwise specified) noted as the previous aquifers discussed. Due to low aquifer <br />transmissivities (range 0.07 [0 0.36 ft2/day), eater sampling tends to mask normal water <br />level fluctuations for Wells 15 W, 16W, 17W and 78W. Both wells 14W and lbw exhibited <br />their highest eater levels ever observed this spring. The increase at Well 14W may be due <br />in part to the same reason that adjacent overburden Well 140V (see previous section) <br />exhibited an increase. well 13W this spring exhibited its highest water level since May, <br />1987. Water level increases noted at Wells 3W, 14W, and 16W are at least in part due to <br />high snowpack runoff recharge this spring. Wells 15 W, 17W, and 18W did not exhibit <br />significant increases in their water levels this year. <br />Wolf Creek Coal. Both Wells 3WC and 17WC exhibit the same seasonal variability as noted <br />3 <br />