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2. Potential to Affect Surface or Groundwater Systems <br /> The Revenue Mine has the potential to affect surface water and groundwater systems given its <br /> proximity to Sneffels Creek and the presence of historic workings that intercept groundwater flow. The <br /> following section describes the tributary water course, known aquifers and the plan for managing <br /> runoff from various mining activities. <br /> 2.1 Adjacent and Tributary Water Courses <br /> Two of the water ways described in the general description are located in the immediate vicinity of the <br /> affected lands boundary a shown on Map C-la and G-1. Sneffels Creek(Segment COGUUN09) forms <br /> the northern project boundary at the Revenue Portal area. Sneffels Creek has a drainage area of <br /> approximately 5,100 acres above the Revenue Portal. The affected lands boundary is bisected by Atlas <br /> Creek, which flows north across the western portion of the property. Atlas Creek captures precipitation <br /> from approximately 470 acres (the bulk of Sidney Basin) as well as discharge from the Atlas Mine on <br /> USFS land prior to entering Sneffels Creek. The Revenue Tailings Storage Facility (TSF) lies <br /> downgradient of Atlas Creek, while the Atlas TSF lies upgradient of the Atlas Creek drainage. Minor <br /> drainages on the north facing hillside are diverted to the Atlas Creek drainage prior to reaching the <br /> affected lands boundary. Stormwater controls are described in Exhibits C and U. <br /> The Governor Basin area is shown on Map C-lb. It comprises a portion of the larger Sneffels Creek <br /> drainage and contains Governor Creek downgradient from the Hoist and Refuge chamber. The <br /> Governor Basin catchment is approximately 870 acres. Given the limited footprint of the affected lands <br /> boundary modification of 1.39 acres, lack of physical processes, lack of wastewater discharge, and <br /> high elevation, impacts to Governor Creek from Amendment 02 activities are not anticipated. <br /> Stormwater will be managed in the Governor Basin project area to reduce erosion. Stormwater controls <br /> are described in Exhibit U and in the Stormwater Management Plan, which is provided in Appendix 2. <br /> 2.2 Known Aquifers <br /> There are no known aquifers in the vicinity of the affected lands boundary. <br /> Groundwater is currently monitored via six wells as shown Map G-1 and Map U-1 that are located <br /> downgradient from mine facilities but upgradient from surface water drainages. Wells GW-IA <br /> (shallow) and GW-113 (deep) are located at the western edge of the permit boundary to monitor the <br /> Atlas TSF. The Revenue TSF and the passive mine water treatment ponds, Mine Water Ponds #1, 2 <br /> and 3 are monitored by wells GW-2A and GW-213 downgradient of Mine Water Pond 1, and GW-313 <br /> revenue Mine December 2021 G-3 <br />