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Appendix 15 —Groundwater Well Details <br /> Groundwater Monitoring Well Installations <br /> As part of the Environmental Protection Plan for the Revenue Mine,three wells were designated for <br /> installation to monitor water seeping from the Revenue and Atlas tailings and waste rock piles.These <br /> wells are shown on all mine maps of the approved permit.Well 1 was located to monitor water from the <br /> Atlas pile and Wells 2 and 3 were designated to monitor the water from the Revenue Pile. In April of <br /> 2014, excavation began to install these 3 wells to bedrock and it was found that the ground conditions <br /> at the well locations were different than previously thought.A simplified cross section of the three <br /> locations is provided on the attached Map G-14. <br /> Map C-4 shows cross sections of the three well locations with respect to the full tailings/waste piles. <br /> As can be seen from the cross sections of map G-14, 2 distinct layers of ground water were identified <br /> from the excavations.The upper groundwater zone is apparently located above a layer of old fine <br /> tailings which are dark in color and has considerable clay.At the well locations,this layer was never <br /> excavated during the mine construction and waste rock placement in the late 1800's.The clay in this <br /> layer is blocking the movement of groundwater below this point.The extent of this layer is unknown <br /> throughout the actual footprint of both tailings piles.The excavation below this original tailings layer <br /> revealed that the round stones and fine mud from ancient flooding of the Creek in this lower layer was <br /> also permeable to the extent that water was flowing into the pit from Sneffels Creek as the material was <br /> excavated.This layer, as shown on the cross sections, is below the Creek level. Bedrock was never <br /> attained in Well locations 2 and 3 while it was encountered at a depth of 16 feet in Well 1. <br /> In order to ensure that we are not missing any seepage water from the tailings/waste rock piles at any <br /> well location, it has been decided to install 2 wells at each sample location. One will be at the original <br /> Revenue Mine TR-03 Appendix 15 Page 1 <br />