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Permit Revision No. 7 -Responses Page 14 <br />March 7, 1997 <br />backSlled, topsoiled, and seeded with MCC's seed mix. In addition, shrub clusters will be <br />planted for wildlife use. <br />77. See response to question 72, in regazds to the USFS land exchange. MCC will be owner of <br />the subject surface lands. <br />MitiEation of the Impacts of Minine Operations (2.05.6) <br />78. MCC is in the process of obtaining a construction permit for the construction activities in <br />Sylvester Gulch from the Air Quality Control Division of the Colorado Department of <br />Public Health and the Environment (CDPHE). MCC will utilize similar dust control <br />methods as in the approved air pollution control plan. A copy of the approval will be <br />provided to CDMG upon its receipt. <br />79. Water storage rights are not necessary to impound water in a sedimentation pond. MCC <br />will utilize SG-1 as a true sediment pond in that water will be contained, treated, and <br />discharged in a timely manner. Water will not be held for a significant amount of time as <br />MCC has the rights (as long as they are in priority) to store water in three other sediment <br />ponds. <br />80. Sediment control measures during construction will consist of silt fence and/or straw bales, <br />etc. as needed at the downslope limits of all construction areas, including road cuts, <br />embankments, ponds, etc. Details of these sediment control measures are shown on the <br />construction drawings, and on plan views. <br />81. An additional Sylvester Gulch surface water monitoring station (known as the South <br />Sylvester Gulch Elume) was proposed in the Apache Rocks permit revision and will be <br />installed this year, following spring runoff. It is located in Section 27, as shown on Map 34, <br />and will be well to the south (above) the new facilities in Sylvester Gulch. <br />82. The detailed plan for controlling groundwater in the shaft has been included in Exhibit 69, as <br />previously stated (see question 19). Other than the estimated 20 to 25 gpm that will be <br />pumped out of the shaft, through the sediment ditch, and to SG-1, no other mine water will <br />be pumped out of the shaft. As previously stated, the small amount of water that will be <br />pumped from the shaft will be easily handled by the sediment ditch and SG-1; therefore, no <br />direct discharge of mine water to Sylvester Gulch will occur. <br />As previously stated, a groundwater control plan is in place which addresses water that will <br />be encountered during the construction of the ventilation shafts, and has been added to <br />Exhibit 69. Also as previously stated, MCC does not anticipate encountering any large <br />groundwater inflows to the shaft excavations as hydrologic testing was performed on <br />exploration drill hole EER, which is located approximately 50 feet south of the proposed <br />