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<br />April 9, 2002 <br />Page 2 <br />a.) The slurry wall will be keyed into fresh shale. <br />b.) We currently anticipate the keyway will be 3 to 5 feet in depth <br />c.) Based on our current information, we do not expect to encounter any variation in <br />the fresh shale. <br />d.) Based on our current infonmation, we expect approximately 3 to 5 feet of weathered <br />shale to be on top of the fresh shale. <br />It is important to note that all of these questions will be answered in greater detail once we <br />have completed the detailed engineering studies required to complete the design of the <br />slurry wall. <br />4) Since the detailed engineering studies for the construction of the slurry wall will not be <br />completed prior to the date of this submittal, Lafarge will initially bond the project at <br />the 100 percent level. Upon completion of these studies, submittal of the appropriate <br />documents to the DMG, and acceptance by the DMG, Lafarge will, at that time, make a <br />formal request for a reduction of our bond to the 20 percent level. <br />5) Lafarge agrees that we will set out clear and distinctive mazkers along the 200-foot <br />setback from the riverbank of the South Platte River prior to commencement of any <br />mining activities. <br />With respect to Mr. Kohlenberg's comments, Lafarge agrees to use and plant only native <br />seed mixes, shrubs, and trees as part of our reclamation plan. In addition, Lafatge will <br />complete the bank stabilization as detailed in our October 21, 2001 Application for a <br />Floodplain Compliance Permit. <br />6) We acknowledge the discrepancy in volume figures for overburden and attribute this <br />discrepancy to an apparent miscalculation. After re-calculating the numbers, we find <br />that there will be approximately 120,596 CY of overburden salvaged by stripping <br />operations. <br />