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4.2.4 Po[entiometric Heads and In[errela[ionshi <br /> <br />Se[Cergren (1979) studied water levels in different strata at <br />three well sites to determine potentials for cross bed flow in the <br />Upper Williams Fork Formation. Figure 4-4 shows the location of <br />the wells. Appendix A contains Che details of the study. <br />A[ the highest well site (GZ) Wells 1, 2 and 3 were drilled to <br />total depths of 399, 250 and 169 fee[, respectively. Well 1 was <br />completed in the Twenty Mile Sandstone, Well 2 was completd above <br />the R coal seam, and Well 3 in shale, sandstone and a coal seam <br />(see Figure 7). Water levels in Wells 1, 2 and 3 were <br />approximately 6,610, 6,820 and 6,970 respectively. Well site GF <br />i.s doe~nslope from [he GZ site in the northern part of the mine <br />~, site. GF wells were drilled to total depths of 640 feet (Well 1), <br />443 f=•~t CWell 2) and 284 feet :Well 3). The deeper two wells at <br />this site were completed in the same strata as the deeper two <br />wells at site GZ. The upper well was completed above the I coal <br />seam. Water levels at Ch is site are shown in Figure 4-5. The <br />ground water levels in GZ and GF indicate that movement could <br />occur in a vertical plane if sufficiently jointed. <br />At the GBB well site, wells were campleted in the alluvium <br />(GBB-3), a shale member of the Upper Williams Fork (CBB-2) and a <br />sandstone member of Che Upper Williams Fork (GBB-1). Depths were <br />8, 68, and 160 feet for Well 3, 2, and 1 respectively. Ground <br />~~ <br />-29- <br />