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Whirlwind Mine Groundwater Characterization Report <br /> hours followed by another pumping attempt, reseating of the packers, and another 3 hours <br /> recharge period did not result in groundwater production from the interval. <br /> WWL conducted sampling at Monitoring Well W-1 in November 2021. A small electric <br /> submersible pump was used to purge and sample at the well. Over 130 gallons of water was <br /> purged at a rate of about 1 gpm with less than 2-ft of drawdown over a period of 2.5 hours. This <br /> event demonstrated that the screened Brushy Basin interval at this well had good transmissivity <br /> and readily yielded water to the well. <br /> 5.0 WATER CHEMISTRY <br /> Water chemistry data are important in the study of mine areas to assess natural groundwater <br /> quality background, understand groundwater sources and conceptual behavior, and to assess <br /> potential impacts of mining. <br /> Surface water and groundwater quality has been studied in relation to uranium and vanadium <br /> mining in the Beaver Mesa area since at least the 1980's. Assimilated water chemistry data <br /> indicate that early mining activity by Umetco and Cotter involved the assessment of <br /> groundwater occurrence and chemistry as early as 1980 and 1996, respectively. The BLM <br /> collected samples on Lumsden Creek, at the Dolores Point well, PR Spring, and Willow Spring <br /> in 1993. EFR initiated sampling and analysis of the Whirlwind Mine water in 2006 and started <br /> sampling area springs and Monitoring Well W-1 in 2008 as part of a quarterly and then annual <br /> groundwater monitoring program at several groundwater sources. EFR has assimilated data <br /> from all these events and continues to add information to the dataset with the annual sampling <br /> program; these data are submitted to DRMS on at least an annual basis. Appendix A presents <br /> the entire compiled water chemistry database for the Whirlwind Mine project (note that other <br /> data may exist in the area but were either not deemed of adequate quality or not relevant to the <br /> project). <br /> For this report, the water chemistry discussion has been summarized to some degree by <br /> presenting data graphically. Interpretation of these data is discussed in Section 7.0 <br /> (Hydrogeologic Conceptual Site Model) of this report. <br /> Western Water& Land, Inc. 25 <br />