Laserfiche WebLink
SUNDAY MINE COMPLEX-HYDROGEOLOGIC REPORT <br /> The well was developed by air lifting with the drill rig and followed by additional pumping with a <br /> nitrogen piston pump. An estimated 1,630-gallon volume was purged from the well during well <br /> development. Thorough purging is vital to well development; at this well, it was also needed to <br /> purge the considerable amounts of foam drilling additive that the drillers had mixed into the <br /> drilling fluids. Table 9-1 presents a summary of well construction information. Groundwater <br /> recovery rates were slow. <br /> 9.1.2 MW-SUN2 <br /> The pilot hole of MW-SUN2 (the western intermediate monitor well), located downdip of the <br /> West Sunday underground mine workings, was completed on September 24, 2012. The hole <br /> was completed through the same Top Rim Sandstone of the Salt Wash Member of the Morrison <br /> Formation as encountered at the MW-SUN3 well located 1,300 ft to the north-northwest. The <br /> target mining sandstone here thinned to approximately 33 ft (700 to 733 ft from surface). The <br /> hole deviated 25 ft due north and is roughly 1,000 ft south of the West Sunday underground <br /> mine workings. The dip of the bedding in the area shallows moving southward and is <br /> approximately 7° to 8°south-southwest (EFR, 2012). A separate pilot hole log was not available <br /> for this report. <br /> Drilling at MW-SUN2 encountered minor water in the Brushy Basin Member, and similarly little <br /> water in the Salt Wash itself. An inflatable packer was installed at 680 ft from the surface to <br /> isolate the Salt Wash from the water above. Water below the packer was airlifted from the hole. <br /> During airlifting, the water discharge from the hole was a continuous three-eighths gallon per <br /> minute. However, the seal between the packer and hole wall was most likely leaking, as the <br /> static level in the water above the packer was falling steadily and the discharged water <br /> remained a red color and never cleaned up to indicate it was making only formation water from <br /> the Salt Wash. Any water coming from the Top Rim Sandstone of the Salt Wash was less than <br /> approximately one-quarter gallon per minute. The crew reset the packer two more times at <br /> slightly different depths in an attempt to get a better seal; however, there was no noticeable <br /> difference in the results. <br /> Drilling and well installation of well MW-SUN2 was not within the scope of work for WWL; <br /> hence, this work was not observed and cannot be described. However, the well construction <br /> diagram is shown in Appendix E. <br /> Western Water& Land, Inc. 28 <br />