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pertorated in the Q and R aquifer while well GE-2 is used to monROr the H and I aquifer in this area. <br />A fairy short period of water level data )s available Ior well sites GF, G2 and GBB. Figures 2.7-24 <br />through 2.7-27 present available water levels for these wells. <br />Twerrtvmiie Sandstone <br />Four wells have been completed In this unk. In the southern mine area, near the Williams Fork <br />Mountains, the Twerrtymile Sandstone is probably unconfined. The 390 foot depths to water in test <br />well GZ-1 are below the top of the sandstone. Further north the sandstone is confined. At <br />groundwater site GD-1, the depth to the sandstone fs 955 teat, but the depth to the static water level <br />is ony 36 feet. The depth to the Twentymile Sandstone arxi the static water level for GD-1 (2) is <br />-1012 Rand -37 h, respectively. At test well GF-1, the depth to the sandstone fs 570 to 590 feet, but <br />the well (lows and has 30 feet (water) of shut-in pressure. In the vicinity of Big Bottom near the <br />Yampa River, Twentymile Sandstone wells flow at rates up to 900 gpm. <br />Figure 2.7-28 shows across-section with wells GF and GZ. The piezometric surfaces for the <br />Twentymile and Below the R coal seam aquifers are shown on the cross-seabn. The gradient of the <br />Twentymile aquifer is much less than the Bebw R aquifer. An aquifer wRh a greater transmissivity will <br />have a Hatter gradiert with other factors fairy similar. <br />Upper Unit of the Williams Fork Formation <br />The Upper Williams Fork as a whole acts more as an aquRard than as an <br />2-5,4 I l~r_vlsior~ n~ ,ruvr_~~ <br />~ nF, rE _1?~11~~ <br />