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Evaluation of Potential Impacts <br />From The Proposed Nix Property Sand and Gravel Operation <br />' On Shallow Groundwater Levels, Water Wells and Wetlands <br />domestic and imgation wells is less than 5 percent of the available saturated thickness at <br />' upgradient locations. <br />' • Lake leveling will create lake surface elevations 0.5 to 3.0 feet higher than the pre-mining <br />groundwater surface at the downgradient end of Mine Areas 1, 2, 3 and 6 based on September <br />' 14, 2001 groundwater surface observations. This leveling effect will tend to benefit <br />downgradient well owners by increasing the saturated thickness in the vicinity of the ponds. <br />I' S.2 Wetland on Sage Hill Farm <br />• Groundwater and moisture conditions vary greatly throughout the wetland. <br />• The wetland is sustained by both surface and groundwater. <br />• The data collected and analysis conducted indicate that there could be small to moderate <br />changes in groundwater levels beneath the wetland from a wet mining alternative. <br />• The magnitude of these changes will likely be within the range of existing groundwater <br />fluctuations. <br />• The wetland is adapted to relatively lazge changes in moisture conditions. <br />6.0 RECOMMENDED MITIGATION <br />6.1 Groundwater Wells <br />Significant effects on water wells near the proposed mine aze not expected. However, the <br />following measures could be implemented if monitoring determines that the mine is affecting the <br />wells in a capacity greater than anticipated and described in this report: <br />1. Deepen the affected well if additional saturated thickness is available. <br />2. Move and/or replace affected well if conditions warrant. <br />' Ott•074.000 <br />April 2002 <br />Wright Water Engineers, Inc. <br />Page 15 <br /> <br />