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Ms. Lynn Mayer <br />January 3, 2005 <br />Page 9 <br />installed prior to any mining. No mining will occur until the slurry walls are in place. <br />Therefore, groundwater will not be lowered by the operation in the vicinity of Little Dry <br />Creek, and seepage from the creek will not increase. To the contrary, Little Dry Creek is <br />located in an area of projected groundwater mounding. As previously described in this <br />letter, the creek will act as a drain and intercept increased groundwater close to the ground <br />surface. This may result in a slight increase in the amount of flow in the creek <br />The East Lateral of the Lupton Bottoms Ditch runs through the middle of the existing <br />operation and the proposed amendment area. Neither a decrease of flow in the East Lateral, <br />nor significant seepage from the East Lateral, has been observed in the existing excavation. <br />The bottom of the East Lateral contains an appreciable amount of fines (e.g., clay- and silt- <br />sized particles), which have effectively sealed the bottom of it, preventing excessive <br />seepage. <br />Excessive seepage from the East Lateral is not anticipated in the proposed amendment azea. <br />The East Lateral will remain in an intact area approximately 70 feet wide. Shiny walls will <br />be installed on all sides of the area prior to mining. Observations in the existing pit indicate <br />that the East Lateral is well sealed. The ground beneath the ditch, which will be surrounded <br />on all sides by slurry walls, will become saturated with water. For these reasons, excessive <br />seepage from the ditch in the amendment azea is not anticipated. <br />We hope that this letter adequately responds to the questions raised by DMG on your mine <br />permit application. We have appreciated the opportunity to be of assistance. Please contact us <br />should you have any questions or require additional information. <br />Very tmly yours, <br />WRIGHT WATER ENGINEERl~, INC. <br />By <br />Senior Scientist <br />Attachments <br />W.S. <br />ce: Maureen Jacoby, Banks & Gesso, LLC (via hand delivery w/attachments) <br />C~PI`1121-129`D20tk~1,trLMaya12-29-04.doc <br />