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Water Quality Chronology <br />Date Event/Activity <br />October 31, 1998 A collection trench was constructed between the seep and <br />the West Pit to intercept the mixture of alluvial groundwater <br />and flow from the West Pit. <br />January 1999 A peristaltic pump was installed in a sump immediately <br />downstream of the seep. <br />February 1999 Interlocking pilon was installed to further isolate and contain <br />the seep. <br />June 1999 An additional seep was identified just upgradient of the <br />original seep; pilon was immediately installed to isolate the <br />seep and a sump was added to control the seepage of <br />groundwater. <br />July 1999 Two seeps were identified adjacent to the original seep and <br />downstream of the original seep; pilon was immediately <br />installed to isolate the seep and a sump was added to control <br />the seepage of groundwater. <br />