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• 10 gallons per minute (gpm) is located above the mine workings along the Lumsden Fault. The spring <br />originates from a Burro Canyon aquifer that abuts less permeable Brushy Basin mudstones along the <br />fault (WWE, 1999). PR Spring, which produces between 4 and 10 gpm depending on the season, <br />originates from the Salt Wash formation just below the mining level (WWE, 1999). The spring is <br />located about 800 feet from the fault and may also be a product of displacement and/or fracturing <br />caused by the fault. Lumsden Spring is located in the lower portion of the canyon about midway <br />between the mines and the Dolores River (see Map G-1). This spring was flowing at 4 gpm when <br />sampled in August 1993 (BLM, 1993) and about 7 gpm when sampled by Energy Fuels in Apri12007. <br />6. Ground Water <br />Much of our knowledge regarding ground water on Beaver Mesa is derived from Boring BM00-1, <br />which was drilled and tested in October 2000 by Umetco. This boring was located on top of the mesa <br />at an elevation of about 7,440 feet. It is located in close proximity to the Whirlwind and Packrat mine <br />workings as shown on Map G-1. Umetco conducted packer tests at different intervals to determine <br />• ground water inflow rates. They also collected water samples from three separate water-bearing zones <br />within the Brushy Basin unit. A water sample was not collected from the Salt Wash due to lack of <br />water. Figure GS presents the well log for this boring. Umetco's report dated October 2000 (U.S. <br />Environmental Services, Inc. (USES), 2000) is presented it its entirety as part 1 of Appendix C. <br />Cotter Corporation (Cotter) previously conducted exploration drilling on top of the mesa in the <br />immediate vicinity of the Whirlwind and older Packrat mine workings in 1996. The seven drill holes <br />completed in this area (JB-96-1 through 7) are 400 to 500 feet east and north of Boring BM00-1 as <br />shown on Map G-2. Although the primary purpose of Cotter's drilling program was uranium <br />exploration, some information regarding ground water was collected. This information (Cotter, 1996), <br />which supports Umetco's findings and provides additional site-specific data, is included in Part 1 of <br />Appendix D. <br />The ground water data for Beaver Mesa shows that the water quality changes markedly with depth. <br />This change in water quality is graphically presented in Figure G6, which is referenced throughout the <br />• subsequent discussions on ground water quality. Figure G6 is a Piper Plot, which is a type of trilinear <br />Whirlwind Mine 07 (rev. April 08) G-7 <br />