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8 Groundwater Quality Data <br /> Groundwater is high quality and meets the Permitted numeric protection limits for groundwater <br /> quality. Groundwater standards are based on agricultural use as determined by DRMS under the <br /> original permit. Groundwater quality within the affected lands boundary at the Revenue Mine <br /> area is measured at seven groundwater monitoring wells (GW-IA, GW-113, GW-2A, GW-213, <br /> GW-3A [replaced with GW-3R], and GW-313). Wells GW-IA (shallow) and GW-113 (deep) are <br /> located at the western edge of the affected lands boundary to monitor the Atlas TSF. Wells GW- <br /> 2A and GW-213, which are adjacent to the Mine Water Pond, and GW-3A, and GW-313, which <br /> are adjacent to the bioreactor(Pond#2), monitor the groundwater potentially impacted by the <br /> Revenue TSF. A more detailed discussion of well locations, construction, analytical suites, and <br /> practical quantification limits can be found in under the Water Quality Monitoring Section <br /> (Section 11 of this EPP). <br /> In addition to the monitoring wells on the surface, mine water quality is monitored via five <br /> underground (UG)water sample points. Underground sampling points and their descriptions are <br /> listed in Table U-5. Underground locations are sampled to characterize source water locations to <br /> better understand water quality as it enters the passive mine water treatment system. <br /> Table U-5 Underground Water Quality Sampling Locations <br /> Station ID Location Sampling Status <br /> UG-1 Yellow Rose Inactive <br /> UG-2 Main line above Yellow Rose Sampled Quarterly <br /> UG-3 Atlas/Cumberland Inactive <br /> UG-4 Main line above Atlas/Cumberland Sampled Quarterly <br /> UG-5 Main line - Portal Sampled Quarterly <br /> UG-7 Main line below Yellow Rose Sampled Annually <br /> UG-8 Main line below Atlas/Cumberland Sampled Quarterly <br /> UG-9 Main line below Terrible Sampled Annually <br /> UG-10 Main line above Terrible Sampled Quarterly <br /> M-2012-032 <br /> Amendment 02 Exhibit U <br /> December 2021 U-20 <br />