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level report for Yell 21A is also provided in Appendix C. It also exhibits typical • <br />seasonal variation. <br />Madge Overburden. Most Madge 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). Yells 110V and 180V exhibit long-term decreasing water level trends, possibly due <br />to low snowmelt runoffs. Yell 120V was removed by mining during the vi nt er of 1991/92. <br />Yell 140Y showed a significant drop (13 feet) in its water level in the late fall due to <br />dewatering caused by en adjacent mine pit. Well 150V does not exhibit typical seasonal <br />trend (its water levels vary randomly) although shallowest water levels tend to occur in <br />September or October. Well 160V exhibited a seasonal variation of only 0.62 feet in <br />1992, the smallest variation of any 4adge overburden well. WeLI 170V exhibits a long-term <br />increasing water level trend, most likely due to recharge from the adjacent 006 Pond. <br />4adge Coal. Madge coal wells exhibit the same typical seasonal variations (unless <br />otherwise specified) noted et the previous aquifers discussed. Due to low aquifer <br />transmissivities (range 0.07 to 0.36 ft2/day), water sampling tends to mask normal water <br />level fluctuations for Wells 15Y, 16W, 17W and 18W. Yells 3Y and 184 exhibit long-term • <br />decreasing water level trends due to low snowmelt runoffs. Yell 13W was removed by mining <br />between September and October of 1991. Yell 14Y has been dry for the entire period of <br />record. <br />Wolf Creek Coal. YeLI 3VC has exhibited unusually shallow water levels the lest three <br />years with the March, 1991 value being the shallowest since Narch, 1981. Well 17WC <br />exhibited seasonal variations typical of all aquifers at Seneca it-Y (i.e., shallow in the <br />spring and summer, deepening in the fell). <br />Ground Water Level Summary. During 1992, most aquifers at Seneca II-W exhibited a typical <br />seasonal fluctuation. Water levels were highest (shallowest) after the spring snowmelt <br />runoff which recharges the aquifer. Often, bedrock (i.e., non-alluvial) aquifers exhibit <br />a lag time between spring runoff and highest water levels. Water levels then decrease <br />(deepen) as late summer or fall approaches. Water levels have generally increased at Well <br />170V due to recharge for the adjacent 006 Pond. Water levels (such as those at Yell 140Y) <br />may decrease due to dewatering from adjacent mine pits. <br />Annual water level maximum and minimum values have, in general, for wells drilled prior to • <br />1987, been on the decrease (i.e., deepening) since 1986. This is probably due to the <br />4 <br />