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A lockable cap has been installed. There was no groundwater detected at the time of installation. See the figure that <br />follows for an illustrative schematic of this installation: <br />Lockable Ca <br />2" DR-11 HDPE Pip <br />Non-Shrink Gro <br />Grade Une- I I X2,375'° Bore <br />Mineral Topsoils / <br />Gravely, <br />Unconsolidated Solt <br />Moderately <br />Weathered Bedrock <br />Slightl <br />Weathered Bedroc <br />Bedr <br />V `W <br />Perforated, 3116° DlQ,, I I II I <br />Spaced 4 Columns, <br />V Annular Rows- - <br />Monltoring LWeR <br />Construction <br />The EPA currently is doing extensive monitoring of ground water sources (as stated earlier, The Big Five Tunnel <br />drainage is monitored, collected, and pumped to the Argo Tunnel Treatment Facility located in Idaho Springs). <br />As a part of normal mill operations, mill process water will be continuously monitored. A pH monitor and data <br />recorder will be installed at the tailings pump location within the mill. Should the pH reach a state outside of the <br />7.5-9 range that is necessary to precipitate the heavy metals, alarm notification will be activated for the operations <br />personnel. The submittal notes on this Serfilco Model 432 monitor/recorder can be found attached in this Exhibit C. <br />If the pH falls outside of the 7.5-9 range, the operators are instructed to shut down the operation that delivers waste <br />to the impoundment. Once the source of the problem is corrected upstream in the process, waste can then be <br />continued to be discharged to the impoundment. <br />It is practically impossible for heavy metals to be in solution under these operating conditions (pH range of 7.5-9) as <br />shown in the attached A Water Handbook for Metal Mining Operations, by Thomas R. Wildeman. <br />Page 7 of 37