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• For the sake of brevity, the GW-52W prefix that precedes all well names, will be dropped <br />throughout this report. As an example, Yell GW-52W-bA1 will 6e referred to as Well bAt, <br />Alluvium. The alluvial monitoring Wells 6A 1, 6A 2, bA3, 6A4, 7A1, 7A 2, BA1, and 9A1 are <br />located along Hubberson and Watering Trough Gulches. All wells except 9A1 exhibit typical <br />seasonal variations, i.e., shallow after the spring recharge, deepening towards the fall. <br />Yell 9A1 exhibited increasing (i.e., shallower) eater levels this year. The area <br />surrounding this well (approximately one mile southwest of the permit boundary) has become <br />marshy beginning this summer, indicating that a spring may be developing here. Water <br />levels at Wells 6A1 to 6A3 are higher than they would normally be in May through July of <br />the past two years due to recently introduced (May, 1989) irrigation in that area. One <br />alluvial well, 19A, is situated approximately one-half mile downstream of the NPDES 006 <br />pond on a tributary to Hubberson Gulch. It also exhibits seasonal variations typical of <br />previously mentioned monitoring wells. <br /> Wadge Overburden. Wadge overburden Wells 110V, 140V, and 170V exhibit seasonal variations <br /> typical of the overburden aquifer (i.e., shallow in the spring or summer, deepening in the <br /> fall). Well 160V exhibited a variation of water levels of only 0.18 foot in 1991. Wells <br />• 150V and 180V <br />d relativel <br />sh <br />ter l <br />ber <br />hibit <br />ll <br />l <br />i <br />S <br />t lth <br />h th <br /> y <br />eve <br />, <br />ex <br />e <br />a <br />ow wa <br />s <br />n <br />ep <br />em a <br />oug <br />ose waxer <br /> levels dropped by October. Well 120V water levels dropped this year due to mining in an <br /> adjacent pit. <br />Wadge Coal. Madge Coal Well 14W uas dry all year. Well 15W exhibited very little (2.5 <br />feet) seasonal variability this year. Due to low aquifer transmissivities for Wells 17W <br />2 <br />and 18W (0.13 and 0.07 ft /day, respectively), sampling for water quality tends to mask <br />normal water level fluctuations. In July, Well 16W exhibited a water level 90 feet higher <br />than had ever previously been measured. By September, however, its water level had <br />dropped to a more normal water level. Water levels at Wells 3W and 13W dropped throughout <br />the year. <br />Wolf Creek Coal. Well 3WC has exhibited unusually shallow water levels [he last two years <br />with the March, 1991 value being the shallowest since March, 1981. Well 17WC exhibited <br />seasonal variations typical of all aquifers at Seneca 11-W (i.e., shallow in the spring <br />and summer, deepening in the fall). <br />. Ground Water Level Summary. During 1991, all aquifers at Seneca II-W exhibited a typical <br />seasonal fluctuation. Water levels were highest (shallowest) after the spring snowmelt <br />3 <br />