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down a well enough to reduce its saturated thickness to less than ten feet, the well is likely to be <br />impacted. <br />The greatest impacts to the Fulton Ditch are expected during the east cell dewatering while the ditch is <br />active. However, it is our understanding that water pumped from the east cell will be discharged into the <br />Fulton Ditch, mitigating the seepage losses. It is also our understanding that, ifpossible, the east cell <br />will be mined during a single dry season, in which case the Fulton Ditch will be inactive and not <br />suffering seepage losses. After mining, the model predicts that the drainage action of the newly aligned <br />Bull Seep will reduce water levels by up to 4 feet in the southeastern part of the site. While this should <br />limit water mounding after the slurry wall is installed, it may also lead to increased seepage from the <br />unlined Fulton Ditch. <br />On the scale of this project, the alluvial and bedrock aquifers are separate hydrologic systems. Because <br />all mining, slurry wall, and dewatering activity will take place in the alluvium, impacts on bedrock <br />aquifer wells and the bedrock aquifer itself should be negligible. <br />S.0 <br />Groundwater modeling is a useful tool for determining the magnitude of impacts to the groundwater <br />system in an area. However, results are not absolute and local variances from simulated results are <br />likely to occur. This groundwater model is based on the aquifer parameters that we believe to be <br />reasonable given our current knowledge of the site. Should conditions be encountered that are <br />significantly different from those used in this analysis or should mining activities in the area be changed <br />significantly from those simulated, we should be contacted to evaluate the appropriateness of the <br />existing model. <br />- $ - July 2004 <br />I:V9I9_018\GW ModcMcponViazekine_Rq ] 2].doc <br />