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... • <br />7 <br />contributing to a particular gaining reach. <br />7. Based on potentially affected area ground water flow <br />characterization, evaluate the potential for hydrologic connection <br />between potential contaminant sources at the mine and discharging <br />adits, seeps, springs, or influent stream reaches. Determine <br />amounts and locations of contaminant loading from ground water to <br />surface water within the potentially affected area. <br />Ambient Ground Aater Quality Determination <br />Given the nature of the Interim Narrative Standard for ciround water <br />established by the Water Quality Control Commission, and the specifics of <br />the ground water provisions of the Mineral Rules and Regulations of the <br />Mined Land Reclamation Board, it is critical that ambient ~3round water <br />quality for the potentially affected area be determined or estimated. A <br />description of background ground water quality will likely be facilitated <br />by installation of one or more "upgradient" wells. The following location <br />criteria for wells to establish background quality is provided: <br />1. Wells completed in aquifer of interest, in same drainage basin where <br />potential for contamination exists. <br />2. The locations must not be hydraulically downgradier~t of known <br />potential contaminated sources. <br />3. Locations should be spatially distributed within the dr:sinage area, <br />and must be reasonably accessible for well installation and <br />sampling. <br />C:\WP51\CLIMAx.GWl <br />