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Environmental Protection Plan, Schwartzwalder Mine 6-1 <br />• 6. DESIGNATED CHEMICALS AND MATERIALS HANDLING <br />Rule 6.4.20(6) requires that this section of the EPP fully describe the procedures for the disposal, <br />decommissioning, detoxification or stabilization for all designated chemicals and toxic or acid-forming <br />materials. The EPP must describe measures to be taken to prevent any unauthorized release of pollutants to <br />the environment and must include adequate reclamation and closure practices for such designated <br />chemicals, toxic or acid-forming materials and describe how unauthorized discharge of acid mine drainage <br />will be prevented. <br />No designated chemicals are currently in use or being stored at the Schwartzwalder Mine site. No acid- <br />forming materials exist onsite. Native rock at the Schwartzwalder Mine is not acid-generating. Instead, it <br />is classified as having a low potential to generate acidic drainage, and no acidic drainage has occurred from <br />the mine or waste rock facilities to date. Geochemical characterization of the waste rock piles is described <br />in Section 7(b). The water quality of the flooded mine workings is described in Section 9(b)(iv). The pH <br />of groundwater in the flooded mine is near neutral, and has been stable (no obvious increasing or <br />decreasing trend) since monitoring of mine water began in 2000. The mine pool has shown no potential to <br />generate acid. <br />The flooded mine workings and the alluvium and fill have been identified as toxic-forming materials on the <br />basis of (1) uranium and radium-226 in groundwater in the underground mine pool and (2) uranium in <br />groundwater in the alluvium and fill. The hydrogeologic conceptual model is described in Section 8(e). <br />Water quality in the mine pool is summarized in Table 9-8 and discussed in Section 9(b)(iv). Water quality <br />in the alluvium and fill is summarized in Table 9-3 and discussed in Section 9(b)(ii). Potential mitigation <br />options for groundwater are discussed in Section 15 along with a proposed schedule for feasibility <br />• investigations, engineering design, and implementation. <br />0 <br />41090.100731 Whetstone Associates