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Tracer spilled into the running water before the tunnel is blocked should not result in <br /> a problem, however, because this tracer will be quickly removed from the site. <br /> 4.4 Monitoring After Placement of Proposed Bulkheads <br /> If the time for the mine water to reach its discharge area in Cement Creek is as long <br /> as expected (Simon Hydro-Search, Inc., 1993), then there is no need to implement <br /> a program of frequent sampling in the area of the Cement Creek drainage. Annual <br /> sampling will be adequate for the purpose of tracking the seepage flow of water from <br /> the lower parts of the mine. <br /> If the mine floods to a higher equilibrium level than expected, causing water to flow <br /> through the Mogul Mine, increased bromide levels will soon be detectable in Cement <br /> Creek. The rate of mine flooding will have to be monitored to determine the most <br /> logical sampling scenario. <br /> If bromide levels in the American Tunnel are raised immediately due to water leakage <br /> past the plug, the bromide concentration in Cement Creek (below Gladstone) may also <br /> be measurably increased. For this reason the residual discharge from the American <br /> Tunnel will need to be monitored carefully to track this possible source of bromide to <br /> Cement Creek. <br /> sunny\wp\traci\2251\Workplan.693 13 <br /> N0 siman HYDRO-SEARCH <br />