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<br />to assure that a contaminant plume is not developing in this aquifer. <br />• The level of uncertainty associated with the water balance, and the aquifer test <br />data used in the Darcy calculation are not known. We recommend that design <br />criteria for any remedial project not be based upon the assumption that long term <br />flux from the pit will be limited to 80 GPM, but rather include an adequate safety <br />factor to accommodate sustained production up [o the flow rates observed in [he <br />pit during mining operations plus the initial flow needed to again de-water the <br />upper portion of the pit and reverse the gradient. <br />If you have any questions on these comments and questions, please feel free to give me a <br />call. <br />Respectfully Submitted: <br />Scott G. Mefford <br />C.P.G. 5021 <br />6 <br />