Laserfiche WebLink
Otperforated in the Q and R aquifer while well GE -2 is used to monitor the H and I aquifer in this area. <br />A fairy short period of water level data is available for well sites GF, GZ and GBB. Figures 2.7-24 <br />through 2.7-27 present available water levels for these wells. <br />Twentymile Sandstone <br />Four wells have been completed In this unit. In the southern mine area, near the Williams Fork <br />Mountains, the Twentymile Sandstone Is probably unconfined. The 390 foot depths to water in test <br />well GZA are below the top of the sandstone. Further north the sandstone is confined. At <br />groundwater site GDA, the depth to the sandstone Is 955 feet, but the depth to the static water level <br />is only 36 feet. The depth to the Twentymile Sandstone and the static water level for GD -1(2) is <br />-1012 It and -37 ft, respectively. At test well GF -1, the depth to the sandstone Is 570 to 590 feet, but <br />the well flows 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 a cross-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-section. The gradient of the <br />Twentymile aquifer Is much less than the Below R aquifer. An aquifer with a greater transmiss" will <br />have a flatter gradient 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 aquitard than as an <br />2-514 I l�r_vlsior� n�,r uvr_�� <br />nATE <br />