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SUNDAY MINE COMPLEX-HYDROGEOLOGIC REPORT <br /> 9.0 MONITORING WELL PROGRAM <br /> Discussions between Denison, the DRMS and the BLM in the spring of 2011 resulted in the <br /> approval of a monitoring well installation program. A groundwater quality monitoring plan for the <br /> monitoring wells was developed as a part of the EPP for the SMC by Denison and reviewed by <br /> the BLM and DRMS (CDM & Denison 2012). <br /> Appendix E shows monitoring well information for each well installed including well permits, well <br /> construction reports, geophysical logs, and well diagrams. Table 9-1 summarizes well <br /> construction parameters for the wells. <br /> 9.1 Well Installation <br /> The groundwater quality monitoring program was designed to meet the requirements of the <br /> DRMS Mineral Rules and Regulations (DRMS MRRs) for Hard Rock, Metal & Designated <br /> Mining Operations and the Colorado Division of Public Health and Environment (CDPHE) <br /> Regulation No. 41 (CDM & Denison, 2012). DRMS MRRs require that groundwater quality data <br /> is collected on a quarterly basis for five successive quarters to establish baseline conditions <br /> (DRMS, 2015). CDPHE Regulation No. 41 provides for the protection of existing and potential <br /> beneficial uses of groundwater through established Basic Standards for Ground Water (BSGW). <br /> Six monitoring wells were initially proposed and approved by the BLM for construction. The <br /> locations of these wells were determined by Denison with consultation from DRMS and BLM. <br /> The wells included an ambient(upgradient) well, two downgradient point of compliance (POC) <br /> wells, two intermediate wells, and one development rock area (DRA) well. After EFR acquired <br /> Denison in 2012, four wells were installed and consisted of one DRA well at the toe of the <br /> Topaz Mine waste rock area (MW-TPZ1), one POC well (MW-SUN1), one intermediate well <br /> (MW-SUN2) and one ambient well (MW-SUN3) (see Figure 8-2). With the exception of well <br /> MW-TPZ1, these wells were designed to be completed in the Top Rim Sandstone Unit of the <br /> Salt Wash Member of the Morrison Formation (Denison, 2012). <br /> Well MW-SUN3 was installed just upgradient of the West Sunday mine workings and is <br /> considered to be representative of ambient background groundwater quality, as it is not <br /> hydraulically downgradient of the affected mine areas. Installation of the second intermediate <br /> and POC wells is to be decided pending the results of this report. MW-TPZ1 was installed to <br /> monitor potential leachate occurrence from the waste rock area. Well completion information is <br /> included in Appendix E of this report. <br /> Western Water& Land, Inc. 26 <br />