2010-09-29_REVISION - M1981185 (13)

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May Day Idaho Mine Complex 112 (d) Permit Application 0 (d) Fracture System with Respect to Facilities Several east-west faults are present within the permit area as shown in Attachment T-3. None of the facilities are located on these faults. The extent of fractures has not been determined. A fracture analysis will be undertaken within the underground workings prior to tailings disposal. (e) Potential Impacts to Surface and Groundwater Surface water and groundwater can be impacted via the following pathways: • Designated chemicals can enter directly into surface water via spills; • Designated chemicals can enter into groundwater via infiltration from surface spills; • Designated chemicals can enter into groundwater via leaching from tailings. 6.4.20(9) Groundwater Quality Data (a) Existing and Reasonably Potential Future Groundwater Uses Two Miles Down- gradient of Affected Lands • There is little published information regarding groundwater conditions in the vicinity of the mine site. A groundwater well search was undertaken within the project area (CD", 2010). A review of well permits indicates that most wells are located within: • Alluvial material of the La Plata River; • Sandstone (undefined, presumed Morrison Formation) north of the fault system; or • Mancos Shale south of the Fault System. Groundwater uses include: • Domestic; • Household; and • Commercial. The location of groundwater wells and a summary of the well permit data are presented in Attachment T-2. Based on the structural interpretation (Section 6.4.20(8)), there is no pathway from groundwater beneath the permit area to groundwater receptors. Reference: CDWR (2010) Colorado's WellView Web hqp://www.dwr.state.co.us/WellViewWeb/. Accessed June 24, 2010. • May Day Idaho Mine Complex 112(d) Permit Application September 21, 2010 10