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confidence in the background measurements will be obtained before the tracer is on <br /> site. <br /> The time before the start of the test is assumed to be extremely limited, on the order <br /> of a few months, so it will not be possible to collect the long term background data <br /> that would be ideal before the start of a multi-year tracing project. To compensate <br /> for this limitation, samples need to be collected from a variety of locations in the area, <br /> even some locations where there is little or no probability of ultimately intercepting <br /> seepage from the mine. <br /> Key locations for background sampling are as follows: <br /> 1 ) discharge from the American Tunnel portal, <br /> 2) flow in the ditch at the proposed location of the American Tunnel <br /> bulkhead, <br /> 3) discharge from the Terry Tunnel portal, <br /> 4) discharge from the lower Mogul Mine portal, <br /> 5) discharge from the Silver Ledge Mine, <br /> 6) the spring which flows from the base of the dump near the upper <br /> entrance to the Mogul Mine (in Ross Basin), <br /> 7) Cement Creek downstream of the confluence of the North Fork and the <br /> South Fork (i.e., just downstream from Gladstone), <br /> 8) Eureka Creek just upstream from the Terry Tunnel discharge, <br /> 9) Mogul Spring, and <br /> 10) the small unnamed spring just downhill from the Adams Mine. <br /> sunny\wp\traci\2251\Workplan 693 9 <br /> N0 simon HYDRO-SEARCH <br />