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• <br />• <br />• <br />PROJECT: FLOW FROM GLOBE HILL MINE TO SCHIST ISLAND MINE <br />AUTHOR: Adrian Brown, P.E. <br />DATE: 9/5/2008 <br />PAGE: 4 OF 4 <br />CONCLUSION <br />1 Globe Hill Mine will remain un-backfilled after Amendment 9, and will have no surface flow outlet <br />for incident precipitation. <br />2 The mine will temporarily collect water after a major precipitation event, due to internal ruoff. <br />3 DRMS is concerned that collected rainwater will seep laterally from the Globe Hill Mine through <br />approximately 1000 feet of rock and emerge in the highwall of the Schist Island Mine, potentially <br />causing groundwater quality impacts within that mine. <br />4 This possibilty has been evaluated by analysing the flow that would result from a maximal <br />precipitation event (12 inches of precipitation in 24 hours). <br />2 Groundwater flow from the Globe Hill Mine to the Schist Island Mine will not occur in isotropic <br />hydraulic conductivity rock. <br />3 Groundwater flow from the Globe Hill Mine to the Schist Island Mine can only occur when the <br />horizontal hydraulic conductity of the rock exceeds 100 times the vertical hydraulic conductivity. <br />4 As the predominant continuous structures in the diatreme are vertical, striking approximately' <br />northwest/southeast, horizontal hydraulic conducitvity is expected to be less than the vertical <br />hydraulic conductivity. <br />5 Accordingly, groundwater flow from the Globe Hill Mine to the Schist Island Mine will not occur. <br />Adrian Brown Consultants, Inc., 130 West Fourth Avenue, Denver, Colorado <br />303-698-9080