2023-02-17_HYDROLOGY - M2007044 - Laserfiche WebLink

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Whirlwind Mine Groundwater Characterization Report 8.5 Potential Ore Pad Leachate Mitigation EFR has provided an ore-pad design, approved by DRMS and BLM, that addresses the concern of leachate contamination. In addition, EFR has installed Monitoring Well W 1 as a baseline monitoring well in the area upgradient of the planned ore pad. The well is completed in the Brushy Basin and has been monitored for water levels and quality at least on an annual basis since 2008. Baseline data show that water quality exceeds state groundwater standards for arsenic and uranium. 8.6 Water Quality Monitoring Program EFR initiated a baseline water quality program in 2008 and has maintained the program to the present. These data are reported to DRMS quarterly and annually as required. 8.7 Water Quality Mitigation EFR's current monitoring plan will continue through active mining operations. Should water quantity and quality conditions indicate a trend or an abrupt change that negatively affect water resources, EFR will conduct investigations to identify the cause of such changes and design a monitoring plan that best addresses the situation. 9.0 SUMMARY AND CONCLUSIONS As described in Exhibit T, Section 10.2, of the DRMS-approved mine permit and Condition#17 in Appendix A of the BLM Decision Record, a hydrologic investigation is needed to adequately characterize the surface and subsurface hydrology is required to investigate and evaluate potential impacts to groundwater and resulting from mining operations. This report fulfills the requirement through the assimilation of historical hydrologic data collected over the last several decades. The Whirlwind Mine is located within the Colorado Plateau on a high-desert mesa, Beaver Mesa, at an elevation of approximately 7,100 ft. The perimeter of the mesa is dissected by deep Western Water& Land, Inc. 59