Laserfiche WebLink
• In order to evaluate each of the three potential bedrock hydrologic zones independently, observation and <br />test wells were constructed to isolate each zone and prevent interflow. The construction method for dually <br />completed observation wells is shown in Figure II.C-25. A similar cementing approach was used to isolate <br />different zones in the test wells. As shown, the Upper Sandstone Facies was isolated from the Siltstone <br />and Coal Facies and water levels in both zones were monitored. ARer the long string of tubing with <br />cementing baskets was run into the hole by the exploration drill, a small service rig was used for cementing <br />and running the second tubing string. Well completions into the Lower Sandstone Facies were similar. In <br />this case, the cementing baskets were placed at the bottom of the plug through the entire Siltstone and <br />Coal zone. In some cases, completions were readjusted if they were not functioning properly. <br />Three test wells were drilled on locations where observation wells also had been completed in an attempt to <br />determine a reliable coefficient of storage as well as transmissivity. Two test wells were completed at <br />Location 2-7 (one into the Upper Sandstone Facies and one into the Lower Sandstone Facies) and one was <br />completed at Location 2-17 (into the Siltstone and Coal Facies). Aquifer tests on the test wells were <br />performed using a service rig with a bailer. The well was bailed for several hours at a steady rate while the <br />water levels (i.e., drawdowns) were monitored in the observation wells. As anticipated, the transmissivities <br />and water production were sufficiently low that the bailer method was quite adequate. Upon conclusion of <br />the drawdown portion of the test, a water quality sample was collected, bailing was stopped and recovery <br />measurements were made on the production well, as well as the observation wells. <br />• In addition to drilling test wells into and examining the potential for bedrock aquifers, five alluvial wells (see <br />Figure II.C-24) were drilled for both monitoring and testing. Wells Qal-2 and Qal-5 were located <br />at the mouths of Red Wash and Scullion Gulch, respectively, to monitor any underflow from the drainages. <br />Well Qal-4 was drilled just south of the White River upstream from the confluence of Red Wash as a control <br />well outside the influence of any mine workings. Well Qal-6 was drilled north of the White River between <br />the mouths of Red Wash and Scullion Gulch to monitor potential upgradient impacts, while well Qal-3 was <br />drilled on the north side of the White River below the confluence of Scullion Gulch. In addition to these <br />wells, data were also obtained from the culinary well nest to the buildings in the mouth of Scullion Gulch <br />(called the Staley House Well) and from an existing well east of the buildings in the alluvium of the White <br />River (called Qal-1). All of these wells, except Qal-5, were subsequently flooded by Kenney Reservoir and <br />rendered unusable. <br />Groundwater level monitoring station surface elevations are given in Table II.C-9. The hydrologic wells <br />were drilled and completed using the exploration drilling rigs and crews provided by Teton Exploration <br />Drilling Company of Casper, Wyoming. Test welt bailing for aquifer testing was performed by Water Well <br />Service of Craig, Colorado. A brief daily record of rig activities is listed in Attachment F. <br />• Permit Renewal #3 (Rev. 8/99) II.C-54 <br />