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~, ._. <br />6 <br />survey. <br /> <br />3. Present a proposal for monitoring well installations required to <br />initiate ground water characterization including locations and <br />procedures for well drilling, well installation, well development, <br />water level monitoring, water quality sampling, ar~d formation <br />hydraulic conductivity determination. <br />4. Present a proposal for laboratory analytical parameters and <br />detection limits. Objectives for the use of analyti~~al chemical <br />data from water samples are: <br />Assess background ground water quality; <br />Evaluate water quality of ground water discharges t:o surface at <br />mine openings, springs, seeps, and gaining stream reaches; <br />Characterize the nature and extent of contamination in all <br />aquifers and evaluate potential impacts to surfz~ce water or <br />current or potential future uses of ground water. <br />Chemical data collected must be sufficient to meet these objectives. <br />Presentation of Hydroqeoloqio Information <br />1. Characterize the ground water flow conditions within all potentially <br />affected aquifers based on the physical geologic and h;~+drogeologic <br />data collected during field investigations. This characterization <br />will provide the basis for understanding the movement of ground <br />water within and between the aquifers. <br />2. Define the lateral and vertical extent of all potentially affected <br />aquifers and describe the nature of ground water movement in the <br />aquifers. Describe aquifer recharge locations and mechanisms. <br />3. Provide hydrogeologic cross-sections depicting potentially affected <br />aquifers, showing monitoring well locations, geology, and water <br />table elevations. <br />4. Using hydraulic conductivity and flow velocity values, evaluate <br />hydraulic characteristics of aquifers and movement of potential <br />contaminants within the aquifer. <br />5. Provide a water balance evaluation of surface streams within the <br />potentially affected area to demonstrate whether ground water <br />contributes significantly to surface water flow, i.e., identify <br />influent or gaining reaches. <br />6. Determine hydraulic conductivity for shallow alluvium in the <br />vicinity of influent reaches. This, in combination with water level <br />data for both surface and ground water, and with stream profile <br />data, would allow an estimate of the volume of ground water <br />